WO2008118500A1 - Plaque de perfusion de substance nutritive avec chauffage et échange de gaz pour criblage de contenu élevé - Google Patents

Plaque de perfusion de substance nutritive avec chauffage et échange de gaz pour criblage de contenu élevé Download PDF

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Publication number
WO2008118500A1
WO2008118500A1 PCT/US2008/004144 US2008004144W WO2008118500A1 WO 2008118500 A1 WO2008118500 A1 WO 2008118500A1 US 2008004144 W US2008004144 W US 2008004144W WO 2008118500 A1 WO2008118500 A1 WO 2008118500A1
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WIPO (PCT)
Prior art keywords
well
plate
tissue culture
wells
culture device
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PCT/US2008/004144
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English (en)
Inventor
Victor Joseph
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Wafergen, Inc.
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Application filed by Wafergen, Inc. filed Critical Wafergen, Inc.
Publication of WO2008118500A1 publication Critical patent/WO2008118500A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00—Constructional details, e.g. recesses, hinges
    • C12M23/02—Form or structure of the vessel
    • C12M23/12—Well or multiwell plates
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00—Constructional details, e.g. recesses, hinges
    • C12M23/40—Manifolds; Distribution pieces

Definitions

  • the present invention relates to a tissue culture device, and more particularly, concerns a multi-well tissue culture assembly for in vitro cultivation of cells in growth media, with features to isolate different chambers of the assembly, control the temperature of the growth media, maintains visibility for imaging and for controlling or regulation of growth conditions, including controlled regulation and monitoring of media gasses (e.g., O 2 , CO 2 , N 2 , etc.), pH, cell density, product concentration, temperature, agitation, and the like. Methods of manufacturing the assembly are also described.
  • media gasses e.g., O 2 , CO 2 , N 2 , etc.
  • HCS high content screening
  • HCS automates the extraction of multicolor luminescence information derived from specific luminescence-based reagents incorporated into cells (Giuliano and Taylor (1995), Curr. Op. Cell Biol. 7:4; Giuliano et al. (1995) Ann. Rev. Biophys. Biomol. Struct. 24:405). Cells are analyzed using an optical system that can measure spatial, as well as temporal dynamics. (Farkas et al. (993) Ann. Rev. Physiol. 55:785; Giuliano et al. (1990) In Optical Microscopy for Biology. B. Herman and K. Jacobson (eds.), pp. 543-557.
  • HCS can be performed on living or fixed cells, using a variety of labeled reporter molecules, such as antibodies, biological ligands, nucleic acid hybridization probes, and multicolor luminescent indicators and "biosensors.”
  • labeled reporter molecules such as antibodies, biological ligands, nucleic acid hybridization probes, and multicolor luminescent indicators and "biosensors.”
  • the choice of fixed or live cell screens depends on the specific cell-based assay required.
  • Tissue culture assemblies are commonly used for in vitro cultivation of cells particularly for experimental purposes.
  • Multi- well tissue culture plates have been used for these purposes, and include six, twelve, twenty- four, forty-eight, ninety-six, etc. wells.
  • Such multi-well tissue culture plates are convenient for the investigator in order to conduct tests for the separation of individual cell cultures while maintaining the cultures in close proximity (all in one plate with a single lid) for performance of related tests or assays on all the cultures.
  • tissue culture plates have been designed to operate in conjunction with an incubator which can help maintain the proper temperature, pH and gas balance (which may be related to pH) of the tissue culture media, therefore allowing optimal conditions for cell and tissue growth and maintenance.
  • tissue culture plates including lids
  • tissue culture plates for multi-well tissue culture have many limitations. First, media may be added or removed only be removing the lid and disturbing the potentially sensitive growth environment, and potentially exposing the chamber to contamination. Furthermore, the temperature, pH and other features of each well are typically controlled by controlling the entire incubator. Finally, visualization or analysis of cells cultured in traditional tissue-culture dishes typically requires removal of the cell culture dishes from the optimized or controlled environment of the incubator, potentially exposing the cells or tissue to stress.
  • Multi-well tissue culture assemblies are exemplified in U.S. Pat. Nos. 4,349,632; 4,038,149; 4,012,288; 4,010,078; 3,597,326 and 3,107,204.
  • Another culture vessel is exemplified in U.S. Pat. No. 4,358,908.
  • none of the inventions described in the above-listed patents overcomes the problems resulting from having to open the tissue culture assembly to monitor and/or regulate tissue culture media, or the additional problems associated with having to use a tissue culture incubator.
  • monitoring of morphological, physiological, and metabolic changes in cell cultures e.g., explant or tissue cultures
  • Microscopic and/or metabolic examinations for up to 24 hours or more must be done under ideal conditions of nutrient, gas and temperature control.
  • sample holders that may be interfaced with heaters or sources of media and/or gasses
  • heaters or sources of media and/or gasses for example, US 2006/021621 1 to Liebel et al.
  • these designs are not configured to allow visualization through the heaters, or typically use with inverted microscopes.
  • these devices do not allow for closed-environment handling (e.g., sensing, stirring, media change, and temperature regulation) all on-dish, without requiring disruption or interruption (and potentially contamination) or alteration of the micro-environment of the well.
  • tissue culture devices e.g., multi-well tissue culture plates or slides
  • the smart slides described herein may allow long-term cell culture by controlling the culture conditions within the chambers of the tissue culture devices, while simultaneously allowing imaging.
  • the devices and systems described herein may reduce or eliminate the process of going back and forth from an incubator to a microscope.
  • Molecular and in vivo imaging approaches may help the physiological role the cells play in their microenvironment.
  • the systems described herein provide a long-term imaging enabling platform that can keep any cells (particularly adherent cells) alive for long durations in the chambers of the plates described. These devices can therefore create user defined microenvironment in each one of the wells, while the cells or tissue are monitored (e.g., on an inverted microscope) without having to take the plate in and out of an incubator. Molecular and in vivo imaging approaches may be used on the cells within the plates, providing a valuable tool for helping to determine physiological roles of many different cells and tissues in a viable culture environment.
  • Described herein are multi-well live cell imaging plates with built-in continuous gas/nutrient exchange and temperature control capability for high content screening ("HCS") that conform to standards developed by the Society for Biomolecular Screening. Described herein are environmentally isolated tissue culture devices that may be used for cell culture.
  • HCS high content screening
  • a tissue culture device comprising: a multi-well plate comprising a plurality of wells, wherein each well is shaped to accommodate at least two insertable tubes; a first nutrient feed manifold comprising a plurality of individual well feed lines, said first manifold positioned above the wells and aligned such that each well feed line extends to a position adjacent a bottom of a well; a second waste removal manifold comprising a plurality of individual waste removal lines, said second manifold positioned above the wells and aligned such that each waste removal line extends to a position adjacent the bottom of the well, wherein the waste feed line extends to a point slightly elevated from the well feed line; a first inlet in the first manifold for providing nutrients; and a second inlet in the second manifiold for removing waste.
  • the tissue culture may further comprise a a micro-heater comprising an optically transparent electrically conductive coating on the optically transparent base.
  • Described herein are plates that may be used for cell culture including "smart" control features that may be sensor controlled and/or user controlled. These plates may be multi-well plates. Plates may control the microenvironment within individual or all of the wells on a plate. For example, on-board features may regulate the temperature, humidity, pH, media level, media composition, CO 2 /O 2 /N 2 levels, drug concentration, cell density, byproduct (or product) production, and mixing of media within the chamber. Thus, the plates described herein may be used without requiring a separate incubator, allowing cells to be analyzed (e.g., imaged) continuously, allowing real-time reactions while monitoring under a microscope for hours, days or even weeks.
  • a separate incubator allowing cells to be analyzed (e.g., imaged) continuously, allowing real-time reactions while monitoring under a microscope for hours, days or even weeks.
  • a tissue culture device may include on-board control of any or all of the features (e.g., temperature, media characteristics (e.g., gas concentrations, pH, etc.).
  • the devices, methods and systems described herein may be used to control any of the aspects of cell culture and maintenance within a chamber, while allowing the visualization of the cells within the chamber.
  • systems including the multi-well tissue culture devices as well as various additional sensors, controllers, microscopes, and imaging devices.
  • the devices e.g., tissue culture plates
  • tissue culture plates may be referred to as smart slides, or smart plates, because they include one or more control features for monitor and/or regulating the growth media provided to cells cultured within one or more chambers of the device.
  • the devices described herein are primarily shown and exemplified as tissue culture plates, they may be used for any appropriate use in which it would be desirable to control the environment of one or more wells or chambers of a plate (e.g., controlling the temperature, pH, fluid content delivered to or taken from the chamber, gas applied to or removed from the chamber, stirring the chamber, cell counting, production of protein, antibody, etc.).
  • the devices described herein may be used for controlling (or monitoring) the mixing of reactants (e.g., chemical reactants), for cell growth (e.g., bacterial cell growth) or fermentation, for immunoassays (e.g., automating fixation, washing, labeling and/or imaging), or the like.
  • reactants e.g., chemical reactants
  • cell growth e.g., bacterial cell growth
  • immunoassays e.g., automating fixation, washing, labeling and/or imaging
  • the plates devices described herein may be useful as part of one or more methods for drug interaction/response/development, cancer research, stem cell research, cell and vascular biology research, cell morphology analysis, enzyme kinetics studies, developmental biology research, drug development, signal transduction analysis, apoptosis studies , tuberculosis testing, calcium assays, toxicology assays (panels), membrane dynamics analysis, neuronal outgrowth studies, growth factor studies, mitosis, and AIDS/HIV research or testing. Examples of some of these methods are described herein.
  • the multi-well plates described herein may be advantageously incorporated into any method involving the use of passive multi-well plates, eliminating the need for a separate incubator, stir plate, and separate monitors, and allowing continuous monitoring.
  • the tissue-culture devices described herein may include any or all of the features described herein, including but not limited to: control of well temperature (maintain cells at physiologic temperatures for prolonged cell life and extended experimentation), regulation of gasses such as CO 2 /O 2 /N 2 (e.g., helping to maintain proper pH throughout experiment), regulation of media delivery (allows for feeding, washing and reagent delivery while imaging), drug delivery (e.g., controlled application of a drug or compound), thin (e.g., cover slip- thickness) well bottoms (permits imaging using inverted microscopes), optically clear well bottoms (permits use of standard light and fluorescence microscopy techniques with no condensation on top cover), disposable (the entire tissue-culture device may be used for a single- use, e.g., disposable, or may be configured to be sterilized and re-used), cell counting, monitoring of production of reactant or cellular byproduct (e.g., proteins, antibodies, etc.), and multiple wells (provides flexibility in experimental design).
  • Software for controlling or integrating with the devices described herein may be used to permit user control of any of the aspects described herein (e.g., programmable temperatures, flow rates, wash cycles & temperature cycles).
  • the plates described herein may include a lid that can be kept at a temperature slightly above the temperature of the bottom heater to eliminate condensation on lid.
  • the lid may also include some or all of the controllable features (e.g., heating, fluid addition, gas perfusion, measurement features, etc.). Including features on the lid may allow the lid to be reused, while disposing of the lower region housing the chambers.
  • each of the wells (e.g., six 35 mm ID wells) is totally isolated from each other.
  • Multiple ports may be provided into and out of each well.
  • the ports may be regulated (e.g., by a valve) manually or automatically.
  • the ports may also include a filter (or filters) preventing contamination or removing particulates.
  • One or more gas vents may also be included (and may also be regulated by valves, such as an overflow valve, or an overpressure valve).
  • Ports may also include splits (e.g., "Y"s) for addition of material (e.g. by injection) into the port, and ports may be connected to any appropriate tubing, or the like.
  • each well may include one or more sampling ports configured as septum ports through which a sample can be taken without breaking the seal.
  • a septum port may comprise a material (e.g., an elastomeric material) through which a needle or other sampling device may be inserted (e.g., by piercing the material) and removed without breaking the isolation of the chamber.
  • the slide may be part of a system that includes a sterile, disposable cell culture slide that has a specially coated cover slip bottom to permit thermoregulation of the slide, as described further below.
  • the system may include a controller that connects to a computer and, via software and/or hardware interfaces (e.g., "SmartWare software"), manages the internal environment (e.g., temperature of the slide, CO 2 , nutrient flow, etc.) at programmed levels.
  • the system may also monitor the environment of the slide, and record conditions within the slide.
  • the system may further include a monitoring system such as a microscope, camera (including video), etc. Alarms may also be included to warn (visually or by sounding an alarm) that a condition (e.g., temperature, pH, fluid level, pressure, O 2 /CO 2 /N 2 levels, etc.) have exceed or fallen below a threshold range.
  • a condition e.g., temperature, pH, fluid level, pressure, O 2 /CO 2 /N 2 levels, etc
  • any appropriate imaging platforms may be used.
  • the plates described herein are adaptable to individual system needs.
  • the smart slides described herein may be used with an inverted microscope with an oil immersion objective or a water immersion lens, an upright microscope, etc.
  • the systems described herein may include an objective heater for controlling the temperature of the objective lens (preventing disruption of the temperature control of the slide when used with an oil immersion or water immersion lens).
  • the systems described herein include a fluid controller including fluid flow components and supply and return bottles.
  • the fluid controller may include a pump (or pumps), a valve (or valves) for controlling the application of material through the ports, filters, and connectors to liquid (e.g., media, etc.) or gas (e.g., O 2 /CO 2 /N 2 gas supplies or mixes) to manage CO 2 levels, supply fresh nutrient media, and to manage liquid and gaseous waste generated.
  • the fluid controller may include hardware or software, including fluid control logic.
  • An electronic controller may be included containing fluid flow electronic components to manage the application of liquids and gasses (e.g., CO 2 , media, drug application, liquid and gaseous waste, etc.).
  • the footprint of slide (e.g., the smart slide described herein) may be similar or identical to an SBS compliant, standard 6-well microtiter plate (each well capable of containing 5 mL of media volume).
  • the multi-well tissue culture plates described herein may be configured as micro- bioreactors.
  • each well may be referred to as a bioreactor (or a micro-bioreactor).
  • the system may control one or more (e.g., 2, 3, 4, etc) sensors for detecting parameters of the wells/ bioreactors and materials therein (including non-temperature parameters).
  • a first optical sensor may be used to detect pH
  • a second optical sensor may be used to detect p ⁇ 2 (e.g. dissolved O 2 )
  • a third sensor may be used to detect pCO 2
  • a fourth optical sensor may be used to detect pN 2 , etc. Any or all of these sensors may be included or may be incorporated as part of each well.
  • each sensor may be activated (e.g., by emitting light of a particular wavelength) to excites a fist optical sensor (e.g., a p ⁇ 2 sensor).
  • a fist optical sensor e.g., a p ⁇ 2 sensor.
  • the response of the sensor e.g., absorption and/or emission
  • the response typically reflects the characteristic of the system or a parameter of the culture conditions within the well.
  • a second round of activation/sensing/detection/analysis may then be performed on the same or a different sensor.
  • Product sensors may also be included as part of the multi-well tissue plates, as described herein.
  • a product sensor may be included as part of each well.
  • a product sensor may determine (e.g., by FRET, displacement of florescent binding, etc.) the binding of a product within the well.
  • the product sensor may also include sensing logic to determine concentration based on the binding kinetics and/or florescence intensity.
  • FIG. 1 illustrates one variation of multi-well plate as described herein.
  • FIG. 2 illustrates a system including a multi-well plate as shown in FIG. 1.
  • FIG. 3 shows detail of one variation of a multi-well plate.
  • FIG. 4A shows another variation of a multi-well plate.
  • FIG. 4B shows a multi-well plate having stirring beads therein.
  • FIG. 4C shows variations of stirring beads, as described herein.
  • FIG. 5A shows a skin explant grown in an incubator (control)
  • FIG. 5B shows a similar skin explant grown in a well of a multi-well plate as described herein.
  • FIG. 6A shows an explant grown in an incubator (control), and FIG. 6B shows a similar explant grown in a well of a multi-well plate as described herein.
  • FIG. 7 illustrates one variation of the bottom of a multi-well plate, including a micro- heater.
  • FIG. 8A and 8B show variations of the bottom of a multi-well plate.
  • FIG. 9A and 9B show schematics of cell counters that may be used as described herein.
  • FIG. 9C shows different variations of light emitters that may be used as part of a sensor as described herein.
  • FIG. 1OA and 1OB schematically illustrate a product sensor as described herein.
  • FIG. 1 OC shows an exemplary competition binding graph of fluorescently-labeled product.
  • FIG. 1OD and 1OE show one variation of the product sensor described herein.
  • FIG. 11 illustrates one variation of a sensor array useful as part of a micro-bioreactor.
  • FIG. 12A and 12B illustrate one variation of a product sensor as described herein.
  • FIG. 13A shows a side perspective view of one variation of a device as described herein.
  • FIG. 13B shows a cross-sectional view through one well of a device.
  • FIG. 14 shows an exemplary temperature profile across a glass plate that has been coated with ITO.
  • FIGS. 15A-C illustrate different variations of electrode arrangements for micro heaters as described herein.
  • FIG. 16A shows a cross-section though one variation of an inner shell of one variation of a multi plate device having six wells.
  • FIG. 16B shows a cross-section though one variation of a multi-well slide.
  • FIG. 17 shows one embodiment of a temperature sensor attached to a gimbaled mount, as described herein.
  • FIG. 18 shows an exploded view of a single multi-well slide, as described herein.
  • FIG. 19A shows a bottom plate plan view of a 96 well plate.
  • FIG. 19B shows a top view of the 96 well plate with nutrient and waste manifolds.
  • FIG. 19C shows a stacked side view of the 96 well plate and lid inlet/outlet ports and nutrient supply and waste removal feed lines.
  • FIG. 20 shows a schematic diagram of a single chamber lysimeter.
  • FIG. 21 shows a schematic diagram of a dual chamber lysimeter.
  • the terms “about” or “approximately” for any numerical values or ranges indicate a suitable dimensional tolerance that allows the part or collection of components to function for its intended purpose as described herein.
  • the terms “patient”, “host” and “subject” refer to any human or animal subject and are not intended to limit the systems or methods to human use, although use of the subject invention in a human patient represents a preferred embodiment.
  • multi-well plates including one or more on-board features for controlling or monitoring materials (e.g., media, tissue, etc.) in the wells of the multi-well plates, systems including multi-well plates, and methods of using these multi-well plates.
  • materials e.g., media, tissue, etc.
  • multi-well plates including one or more on-board features for controlling or monitoring materials (e.g., media, tissue, etc.) in the wells of the multi-well plates, systems including multi-well plates, and methods of using these multi-well plates.
  • the smart well plates described herein may include any reasonable number of chambers or wells (e.g., 1, 2, 4, 6, 12, 18, 24, 48, 96, 192, 384, 768, 1536, 3072, etc.).
  • FIG. 1 shows one variation of the smart multi-well plate described herein, having six independent chambers.
  • the plate is compliant with typical (e.g., 'standard') sizes of cell culture plates.
  • the plate shown in FIG. 1 is SBS compliant (5.0 inches by 3.3 inches). However, any appropriate shape or size may be used.
  • the wells may also be any appropriate shape and size.
  • the six wells shown in FIG. 1 are 35 mm ID micro wells that are 19 mm deep. The sides of these wells are perpendicular to the bottom.
  • the wells may also be any appropriate shape or size (e.g., volume). Typically, cells or tissue are cultured within the wells, thus the wells may be adapted so that the tissue or cells may attach or adhere in any appropriate surface. In some variations, the wells may be adapted to receive an insert containing the cells or tissue.
  • the multi-well plates (e.g., "microplates") described herein may be used in biological and pharmacological research, and may be configured so that the dimensions (or other appropriate specifications) conform to industry standards.
  • SBS Society for Biomolecular Screening
  • the devices described herein conform to the SBS standard footprint.
  • the plates described herein may be within the maximum dimension of the height requirements for micro plates established by SBS standards.
  • the plates may be handled by automatic handling.
  • Wells may also be treated or coated with any appropriate agent.
  • coatings to enhance cell adhesion or cell culture may be used (e.g., poly-L lysine, etc.), or coatings to inhibit cell growth in some regions (e.g., the walls, around port openings, etc.) may also be used.
  • the bottom of the wells is made of a clear glass material, allowing the well to be visualized from beneath.
  • the smart well plates described herein may be made of any material or combination of materials.
  • at least a portion of the smart wells may comprise glass, ceramic, or polymer.
  • the wells may be at least partially made of a polymeric material such as PET (Polyethylene Terephthalate). Any appropriate material may be used. Different regions of the multi-well slides may comprise different materials, having different properties. For example, in FIG. 1, the sides of the wells are made of PET, while the bottom is glass. Furthermore the bottom has been coated with a material to permit thermal control of the wells, as described below in the section titled "Temperature regulation".
  • PET Polyethylene Terephthalate
  • the multi-well plates may also have a desired thickness in different regions.
  • the bottom of the multi-well plate (shown as glass in FIG. 1) may be thin enough to permit imaging through it using an inverted microscope (e.g., approximately 0.5 mm thick clear glass).
  • the multi-well plate may also include a removable lid.
  • the lid may cover each well either loosely (as in standard multi-well plates) or it may seal over some or all of the individual chambers.
  • the lid may include one or more gaskets (e.g., o-rings) for sealing around the lip of the wells, preventing any uncontrolled exchange of material between them, and also helping to maintain the microenvironment formed within each well.
  • the lid may also comprise one or more materials, and may permit light or other modes of sensing to pass through all or a region of the lid.
  • the lid may include a glass region, or other transparent and/or translucent region. Non-removable lids may also be included as part of the multi-well plate.
  • the lid may seal against the wells.
  • the lid may be a single (unitary) lid covering all of the wells, or it may be divided into separate lids (e.g., separable operable lids covering one or more individual wells).
  • the lid may secure onto the wells.
  • the lid may snap and/or lock onto the well(s).
  • the lid may also be heated, as described below in the Temperature regulation region. Heating the lid may prevent condensation, and may be used to regulate the temperature of a well in the plate (e.g., instead of or in addition to heating the bottom and/or sides of the plate or individual wells).
  • the lid may include any of the features described herein as part of the multi-well slide (e.g., ports into/out of the wells, sensors, temperature controlling elements, data and/or power inputs/outputs, magnetic stirrers, etc.).
  • the lid maybe reused with different lower portions of the multi-well slide. For example, the lower portion may be disposable while the lid is reusable, and may be sterilizable.
  • the lid may be configured to allow sterilization (e.g., by heat, alcohol, radiation, etc.). This may save cost, as sensors, magnets, heating elements, etc. may be placed on the lid instead of the lower region of the multi-well slide.
  • sterilization e.g., by heat, alcohol, radiation, etc.
  • sensors, magnets, heating elements, etc. may be placed on the lid instead of the lower region of the multi-well slide.
  • any of the features, uses or properties herein attributed to the "plates” or "multi-well plates” may be incorporated into the lid.
  • the ports, magnets (stirrer) or the like may be present on the lid and/or the lower region of the plates.
  • the multi-well plate includes multiple ports into and/or out of each well.
  • FIG. 1 shows four ports accessing each of the six wells.
  • any appropriate number of ports may be used (e.g., 1, 2, 3, 4, 5, 6, etc.), although typically at least two ports are included.
  • Each port may include a dedicated function.
  • a port may be used for adding or removing material (e.g., media, gas, salts, etc) to and/or from the well.
  • a port may also be used to extract samples from the well.
  • FIG. 3, described further below, shows examples of four different ports of a multi-well plate including a feeder port 7, a sample port 8, a NaOH ⁇ - pump port 5, and an O 2 port 6.
  • ports shown in FIG. 1 are located on the side of the plate.
  • One of the four ports for each well is spaced differently from the others, providing a reference so that a user can readily distinguish which port each one is.
  • ports may be different sizes or shapes, and may include quick-connect or quick-disconnect features.
  • Ports may also include one or more valves controlling the opening/closing of the port. Valves may be controlled manually (e.g., by turning, pushing, etc.), or automatically (e.g., solenoid valves). Valves may also include emergency release mechanisms (e.g., overpressure release valves). The size of the different ports may be determined based on the purpose of the valve (e.g., for use with liquids, gasses, etc), the presence or absence of a filter as part of the port, and the desired range of flow rates through the port.
  • a port may be provided for applying media (e.g., culture media) to an individual well of the plate.
  • media e.g., culture media
  • the outlet for the port within the well may be located in any appropriate position, including the upper portion of the wall of the well (so as not to disturb cultures growing at or near the bottom of the well), or near the bottom of the well (for more rapid exchange of culture seen by the cells or tissue in the well).
  • the wells may include ports connecting adjacent wells to each other, allowing passage of material between individual wells of the plate.
  • Flow of fluids (liquids, gases) into or out of the wells through the ports can be controlled (instead or in addition to the valves) by one or more pumps, or by gravity feed. Any appropriate pump may be used (e.g., peristaltic pumps, etc.).
  • One or more filters may be included with the port to filter material entering or exiting the wells through the ports.
  • a filter may prevent contamination by preventing cells (e.g., bacteria, etc.) from pasting through the port into or out of the wells. Filters may also prevent particulate matter from entering the port or the well.
  • a filter may prevent magnetic stirring particles from leaving the wells of the plate. Any appropriate filter or type of filter may be used, including fibrous filters, porous membrane filters, capillary filters, fabric filters, etc. Selective filters (e.g., size selective filters and active selective filters such as electrostatic filters) may also be used.
  • each well may have one or more sample port, which may be used to remove material from within the well.
  • a sample port may be configured so that material from within a well may be removed without breaking the biological isolation (e.g. seal) on the well.
  • a sample port may be configured as a septum through which a sampling device (e.g., a needle) may be inserted to remove material.
  • the septum comprises a material, such as an elastomeric material, that seals around the sampling device inserted through it, and closes back up after removal of the sampling device.
  • the septum may comprise an elastomeric plug (e.g., a plug made from rubber, silicone, etc.).
  • FIG. 13A illustrates a side perspective view of one embodiment of such a device.
  • multiple septum ports are aligned along the outer wall (near the upper edge) of the multi-well plate.
  • Each septum provides access to a single well.
  • FIG. 13B shows a cross section illustrating additional features that contribute towards the biological isolation of each well of a multi-well plate as described.
  • the septum port is shown passing through the upper region of the wall of a well.
  • the septum port on the inner side of the wall is contiguous with the septum on outer wall, providing access through the septum material into the well.
  • the septum port in the well is approximately 17 mm above the bottom of the well, however it should be understood that the septum port may open into the well at any appropriate height or position. For example, it may be beneficial to access the well from the bottom or middle region.
  • FIG. 13B also illustrates in cross-section a multi-well plate in which a lid has been sealingly engaged with the well.
  • the lid is shown as closing over the well and pressing against a seal (shown here as an O-ring) around the inner lip of the lid-engaging region of the well.
  • the lid shown in FIG. 13B also includes snap clips that extend from the lid to engage snaps (receptacles) on the body of the multi-well device.
  • the snap clip extends from the body and engages receptacles on the lid.
  • the snap clip engages the lid so that it may be sealed against the well, isolating it from the external environment, and from adjacent wells.
  • the plates may also be connected to one or more power sources.
  • the plate includes an onboard power connector providing power to the heating portion, any valves, any controlling logic (e.g., hardware) on the plate.
  • power may be supplied by a power regulator or power controller.
  • the power may be supplied by an onboard power supply, such as a battery.
  • the plate may include power conditioning circuitry to regulate power to the various components, including the heater. Separate power supplies may be provided to different components of the plate (e.g., heater, sensors, valves, etc.).
  • any appropriate sensor may be incorporated into the plates.
  • Sensors may be positioned either within one or more of the wells, outside of the well, or both inside and outside of a well (for example, embedded within the body of the plate).
  • Optical sensors e.g., for detecting temperature, pH, dissolve gasses such as O 2 , CO 2 , etc.
  • O 2 , CO 2 , etc. are particularly useful since at least a portion of the plate may be made transparent to the sensor, so that it may detect changes within the environment of the wells without disturbing the well chamber. Any appropriate type of sensor may be used.
  • the present invention relates to a SBS-compliant multi-well live cell imaging plates with built-in continuous gas/nutrient exchange and temperature control capability for high content screening ("HCS").
  • a multi-well live cell imaging plate according to the invention conforms to standards developed by the Society for Biomolecular Screening (SBS) specification of 96, 384, or 1536 wells per plate.
  • Figure 19A shows a typical SBS-compliant plate according to the invention with 96 wells. It can be easily adapted to plates with 384 or 1536 wells.
  • the multi-well plates described herein may be used in biological and pharmacological research.
  • cells or tissue are cultured within the wells, thus the wells may be adapted so that the tissue or cells may attach or adhere in any appropriate surface.
  • Wells may also be treated or coated with any appropriate agent.
  • coatings to enhance cell adhesion or cell culture may be used (e.g., poly-L lysine, etc.).
  • the bottom of the wells is made of a clear glass material, allowing the well to be visualized from beneath. Furthermore the bottom has been coated with a material to permit thermal control of the wells, as described below in the section titled "Temperature regulation".
  • the bottom of the multi-well plate (shown as glass in FIG. 19) may be thin enough to permit imaging through it using an inverted microscope (e.g., approximately 0.5 mm thick clear glass).
  • FIG. 19 shows at least two ports for accessing each of the six wells.
  • Each port may include a dedicated function.
  • a port is used for adding nutrient and a second port if used for removing waste material (e.g., media, gas, salts, etc) to and from the well.
  • waste material e.g., media, gas, salts, etc
  • a port may also be used to extract samples from the well.
  • Flow of fluids (liquids, gases) into or out of the wells through the ports can be controlled (instead or in addition to the valves) by one or more pumps, or by gravity feed. Any appropriate pump may be used (e.g., peristaltic pumps, etc.).
  • FIG 19A shows a plan view of a bottom plate 1900 where each well 1903 is shaped to accommodate insertable nutrient tubes 1901 shown in green at the tope left of each well and waste removal tube 1902 shown in red at the bottom right of each well.
  • each plate has Indium Tin Oxide (ITO)-coated 175 micron thin optically clear glass 1930 shown in yellow or heater element 1940 shown in orange in closed loop temperature sensor.
  • ITO Indium Tin Oxide
  • Figure 19B shows a top view of the system. Above the bottom plate, a removable nutrient feed manifold 1910 with 96 individual well feed lines 1912 attached to the bottoms of the manifold 1910 and extending 0.5mm above the bottom of the well 1903.
  • the nutrient feed manifold 1910 is aligned with the wells 1903 and the well feed lines 1912 are aligned with the nutrient inlets of the wells 1901.
  • the nutrient feed manifold 1910 can be connected to single inlet 1914 via a pump to nutrient feed bottle (not shown). Based on Pascal's principle (Pascal's principle : Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container) flow of nutrient is uniform to all wells 1903.
  • Pascal's principle Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container
  • the nutrient feed manifold 1920 is aligned with the wells 1903 and the waste removal lines 1922 are aligned with the waste outlets of the wells 1902.
  • the waste removal line 1922 extends into the well up to a point that is slightly elevated from nutrient feed line 1912 such that a level of nutrient is maintained within the wells.
  • Waste removal is operated at a higher flow rate than nutrient input rate to avoid overflow.
  • Waste manifold 1920 is connected to single outlet line 1924 via a pump to a waste bottle (not shown).
  • Drugs, growth factors, etc. can be added to any well 1903 using standard dispensers & pipettes. Any additional features or modifications disclosed el;sewhere in the specification may be adapted for use with the SBS-compatible, multi-well, nutrient perfusion plates.
  • the multi-well plate may also include a removable lid 1960, as shown in Figure 19.
  • the lid may include one or more gaskets (e.g., o-rings) for sealing around the lip of the wells, preventing any uncontrolled exchange of material between them, and also helping to maintain the microenvironment formed within each well.
  • the lid may be a single (unitary) lid covering all of the wells.
  • the lid may also be heated, as described below in the Temperature regulation region. Heating the lid may prevent condensation, and may be used to regulate the temperature of a well in the plate (e.g., instead of or in addition to heating the bottom and/or sides of the plate or individual wells).
  • the lid may include any of the features described herein as part of the multi- well slide (e.g., ports into/out of the wells, sensors, temperature controlling elements, data and/or power inputs/outputs, magnetic stirrers, etc.).
  • gas CO 2 , O 2
  • Each lid comprises Indium Tin Oxide (ITO)-coated 175 micron thin optically clear glass 1930 shown in yellow or heater element 1940 shown in orange in closed loop temperature sensor.
  • any appropriate heating or cooling components may be used.
  • the temperature of one or more wells of a plate may be heated by a heat-generating device such as a micro-heater comprising a combination of electrically conductive coating applied to a region (or regions) and one or more electrodes arranged to contact the electrically conductive coating.
  • a heat-generating device such as a micro-heater comprising a combination of electrically conductive coating applied to a region (or regions) and one or more electrodes arranged to contact the electrically conductive coating.
  • resistive heating warms the region of the plate covered by the electrically conductive coating.
  • the arrangement of the electrically conductive coating and electrodes may be configured to allow accurate and/or uniform resistive heating of the wells of a plate.
  • each well of the plate may be controlled to within ⁇ 0.1 0 C over the range of 3O 0 C to 60 0 C.
  • micro-heating similar to the micro-heater described herein for use with the multi-well plates may be found in WO 2005/118773 (titled “Apparatus and Methods for Multiplex Analyses”) which is herein incorporated by reference in its entirety.
  • Micro-heaters are typically made of coatings of materials having high thermal conductivity and chemical stability. Such materials include, but are not limited to metals such as chromium, platinum and gold, and semi-conductors such as ceramics, silicon, and geranium.
  • a material that is particularly suited to form the heating coating is indium tin oxide (ITO).
  • ITO is a transparent ceramic material with a very high electrical conductivity. ITO can be layered (e.g., by sputtering, thermal evaporation, etc.) onto the substrate of the plate. The coating may be placed in electrical contact by an electrode (or multiple electrodes) to form the heating element. When current is passed through the coating, the coating heats up.
  • the heating element is typically connected via electrode contacts to electrical leads which connect to a power source that provides voltages agrees the element and effects subsequent heating.
  • the heating element may also be coupled to a temperature sensor to control the temperature and hence the thermal profile of the plate.
  • the electrode contacts may be configured to provide uniform and controllable heating across the plate. The electrical contacts may therefore be distributed so that the current density across the ITO coating is uniform, or is distributed to prevent heating some regions more than others.
  • the electrode contacts are distributed in a tapered fashion across the base of the plate after it has been coated with ITO. Examples of the tapered electrodes which may be used to warm the plate include electrodes that are wedge-shaped, curved, and vary in thickness or angle.
  • conductive (heating) coatings that are substantially transparent include any transparent conductive oxide such as ITO, FTO (fluorine-doped tin oxide), ATO (antimony tin oxide), etc. Any appropriate method may be used to apply the conductive coating, including sputtering, printing, painting, dipping, or the like.
  • ATO may be applied using a film patterning technique, such as film patterning using and inkjet to form the heater/electrode arrangement.
  • ATO may be "printed” instead of sputtered by using ATO particles in a liquid medium (e.g., a suspension).
  • the coating e.g., ATO
  • the coating can be annealed at low temperature in a vacuum after printing.
  • ATO may be particularly useful, since is typically over 95% transparent (compared to ITO's 85% transparency in the visible region).
  • the electrical connection e.g., electrode
  • the electrical connection may also be formed by printing, sputtering (e.g., masking), etc
  • Transparent conductive coatings may allow the well to be visualized or imaged through the heating element.
  • any relatively transparent conductive films may be used, including, e.g., conductive cadmium oxide (CdO) films.
  • the micro-heater includes a protective layer of material to protect the conductive coating.
  • a protective layer may be placed directly against the resistive coating.
  • the protective layer may comprise a clear (light-transmitting) layer.
  • the protective layer is a protective coating.
  • a coating of SiO may be used to protect a conductive coating (such as ITO).
  • coatings including the conductive coating and a protective coating or coatings may be applied in any appropriate manner, including dipping, painting, sputtering, spraying, evaporating, etc.
  • the protective layer may also be a thermally (and/or electrically) insulative layer.
  • any appropriate region of the plate may include a conductive coating (e.g., the bottom, sides, lid, etc.). Coatings are preferably done external to the inner surface of the well (which will not contact the tissue or cells within the well). Coatings may be external, or they maybe located (e.g., sandwiched) between other regions of the plate.
  • a conductive coating may be covered with an insulating and/or protective coating as just described.
  • thermally and/or electrically insulating materials are particularly useful for protecting the micro-heating region.
  • one or more thermal sensors may be included to help regulate the temperature of the plate when using the micro-heating method described.
  • a thermal sensor may be connected to a controller either on the plate (e.g., integrated into the plate) or off of the plate (e.g., connected to a controller) to provide feedback to regulate the plate temperature.
  • the temperature sensor (or sensors) may be located in any appropriate location of the plate, and therefore may help regulate the temperature at any appropriate region of the plate (e.g., the wells).
  • the temperature sensor is located adjacent to a wall of one or more wells in the plate. This may allow the temperature to be regulated based on the temperature of the media or material within the well.
  • FIG. 7 illustrates one example of a multi-well plate (shown as a 6-well plate) that is temperature controlled.
  • a region of the bottom of the plate 701 is shown coated with a transparent coating of ITO (electrically conductive coating) 711.
  • the ITO coating 711 is also connected to two tapered electrodes 703, 703' on both sides of the plate.
  • the narrower end of the tapered electrodes 703, 703' are connected to a voltage/current source (not shown) through connectors 707.
  • the connectors 707 (or a single connector connecting both electrodes), are shown projecting from one side of the plate. Although a pair of connectors corresponding to each tapered electrode is shown, a single connector may be used.
  • any appropriate electrode may be used to contact the electrically conductive coating.
  • the electrodes 703, 703' shown in FIG. 7 are metal electrodes that are applied to the bottom of the plate in a tapered pattern that is triangular, with the wider region of the electrode furthest from the connector contact. Metal electrodes such as these may be applied by printing, painting, adhesive, etc. Thus, since current passes from the electrode from the direction of the connector contact, the current density may decrease.
  • the tapered shape of the electrode allows the current heating the ITO coating to more controllably heat the plate.
  • Any appropriate 'taper' may be used, including non-uniform tapers 810, 810', as shown in figure 8B. The taper shown in FIG. 7 and FIG.
  • the electrode 8A changes from a narrow diameter (approximately 2 mm near the connector) to a wider diameter (approximately 4 mm furthest from the connector) at a constant (straight-line) rate.
  • the electrode is tapered by changing the depth (e.g., thickness) rather than (or in addition to) the width, as shown in the figures.
  • the geometry chosen e.g., the shape of the tapered electrode
  • the taper may be chosen so that the temperature between different wells that are all connected to the same electrodes is approximately equivalent (e.g., within ⁇ 1°C, ⁇ 0.5°C, ⁇ 0.1°C, etc.).
  • the temperature may be distributed non-uniformly between different wells.
  • the temperature may be slightly cooler in the wells closer to the connector (e.g., 36.5 0 C) compared to the end of the plate further from the connector (e.g., 37°C).
  • the electrically conductive coating 71 1 shown in FIG. 7 is uniformly spread across the entire bottom surface of the plate. Thus, a single coating region contacts both electrodes.
  • different regions of the plate may correspond to different electrically conductive coatings, as shown by figure 8A.
  • FIG. 8A three separate electrically conductive coating regions are shown 802, 804, 806. These regions are each electrically connected to the electrodes printed on the bottom of the plate.
  • each region is connected to an individual electrode (or set of electrodes). These regions may correspond to one or more wells. For example, each of the three regions shown in FIG. 8 A corresponds to the base of two wells (not shown).
  • FIG. 14 illustrates the temperature profile across a glass plate that has been coated with ITO.
  • the ITO is in electrical contact with two tapered electrodes (similar to those shown in FIGS. 7 and 8).
  • the ITO-coated glass may serve as (or be thermally connected to) the base of the plate or a top for the plate.
  • the glass plate is a large thermal mass having a large surface area for heat radiation. The outer corners tend to cool, while the inner center region becomes warmer than the outer edges, resulting in a temperature gradient.
  • thermo plastic sheet is used to demonstrate regions of different temperature in one variation of a heating system. Although these differences may be slight, and confined to the periphery of the plate, it would be desirable to eliminate them.
  • FIG. 8A shows one variation of a heating plate having different heating zones traversing the longest dimensions of the plate.
  • a series resistor may be connected between the center zone and the source of electrical energy.
  • the shape and positions of the electrodes may be configured to produce a more uniform distribution of temperature across the plate.
  • a micro heater comprises four electrodes (two on either long axis of the ITO coating.
  • the "gap" in the electrode coverage along the long axis of the device may cause a reduction in heat in the center of the plate.
  • FIG. 15B illustrates another variation of the device, in which the periphery of the ITO coating includes electrodes of alternating polarity. This arrangement may allow for increased heating at the edges and corners, so that heat is not exclusively concentrated at the center region.
  • FIG. 15 A a micro heater comprises four electrodes (two on either long axis of the ITO coating.
  • the "gap" in the electrode coverage along the long axis of the device may cause a reduction in heat in the center of the plate.
  • FIG. 15B illustrates another variation of the device, in which the periphery of the ITO coating includes electrodes of alternating polarity. This arrangement may allow for increased heating at the edges and
  • the electrodes extend from the periphery of the ITO coating towards the center of the device (resulting in the "L"-shaped electrodes shown). The polarity of these electrodes alternates. In this variation, the electrodes can still be kept clear of a base region of a particular well, allowing visualization through the base of the well. In some variations, the electrodes may be at least partially visible through the well of the plate. As mentioned previously, the electrodes may comprise any appropriate material. In some variations, the electrodes comprise flex circuit connectors. For example, flex circuit connectors may be made from polyamide with two or more layers of copper.
  • the plate e.g., individual wells of the plate, or portions of the wells
  • the plate are thermally isolated by the inclusion of an air gap surrounding the plate or each well.
  • An air gap helps to thermally isolate the wells from the surroundings.
  • the base of the plate may rest on a metal surface, or a surface that would otherwise sink heat from the plate (by thermal conduction).
  • the base of the plate may be isolated from this kind of thermal conduction by including an air gap between the base (or sides) of the plate and the surface upon which the plate rests.
  • the plate comprises an inner shell that may be surrounded by an outer shell. The inner shell may form one or more of the walls of the wells.
  • 16A shows a cross section of one variation of an inner shell having six wells.
  • a base plate (configured as a heater, by coating with thermally-conductive material connected to electrodes, as described above) is connected to this inner shell, and the inner shell is surrounded by an outer shell.
  • the outer shell and the inner shell meet at discrete points, minimizing the thermal contact between them. In some variations, these contact points are insulated by a thermal insulator.
  • FIG. 16B shows a cross-section though one variation of a multi-well slide, showing the inner shell connected to the outer shell. Air gaps are visible between the inner shell and the outer shell.
  • a lid also having a heater
  • FIG. 16B shows a cross-section though one variation of a multi-well slide, showing the inner shell connected to the outer shell. Air gaps are visible between the inner shell and the outer shell.
  • a lid also having a heater
  • FIG. 16B shows a cross-section though one variation of a multi-well slide, showing the inner shell connected to the outer shell. Air gaps are visible between the inner shell and the outer shell.
  • a lid also having a heater
  • Other variations having an inner and outer shell are shown in more detail below, in the section on Making or Manufacturing Multi-Well Plates.
  • at least one temperature sensor 715 may be in contact with a portion of the plate. In FIG. 7, the temperature sensor is a Resistance Temperature Detector (RTO) that contacts the ITO coating near the connectors.
  • RTO Resistance Temperatur
  • Two electrical leads 721 , 721 ' contact the RTO and attach to another connector 725, so that the temperature may be determined and may feed back into the regulation of the plate temperature, as described above. More than one temperature sensor may be used, and the temperature sensors may be used in any appropriate location.
  • a temperature sensor is connected to the outside of a well at or near the heater substrate (micro heater) bottom of the well.
  • a temperature sensor may be in thermal communication with a portion of one or more wells of the plate by either directly contacting a wall of the well (e.g., the outside of a glass plate forming the bottom of the well), or by contacting the well through an intermediary.
  • the temperature sensor may communicate with the heater substrate of the well through a thermally conductive grease or oil. By using the oil or grease as an interface, the temperature sensor does not need to directly (physically) contact the glass substrate, preventing scraping or other types of mechanical damage to the plate.
  • a gimbaled mount has one or more rotation degrees of freedom, adjusting the position of the temperature sensor until it is in contact with an outer portion of the well, or a glass region forming the bottom or top of a well.
  • the gimbaled mount may flex or rotate to allow the temperature sensor to rest against the glass without damaging it.
  • FIG. 17 shows one embodiment of a temperature sensor attached to a gimbaled mount having two degrees of removable freedom. This gimbaled mount may be configured as a removable mount.
  • the gimbaled mount includes a bracket 1701 to which the base 1705 is connected at a 90° angle.
  • the bracket is configured to mate with a region of the plate (e.g., a region of the outer shell) and allow the temperature sensor 1703 (Resistance Temperature Detector or RTD) to contact the glass substrate coated with thermally conductive material that forms the base of the plate.
  • the gimbaled mount may be made (at least partly) of an elastomeric material or a material that is relatively flexible. In some variations the gimbaled mount comprises an injection molded polymeric material. In the variation shown in FIG. 17, the mount comprises cut away sections that allow the mount to move (e.g., bend or rotate) readily.
  • the concentric support rings are each connected at two points, allowing movement at the unconnected regions.
  • temperature sensors as described herein may be removable from the plate, and may be used with other plates.
  • some components of the plates e.g., the temperature sensor
  • the gimbaled mount described above may be a removable gimbaled mount. The gimbaled mount may make it easier to disengage and re-use a temperature sensor on other plates (or other portions of a plate) without damaging the plate, the mount, or the temperature sensor.
  • the Hd (or top) of the plate may also include a similar temperature control (e.g., electrically conductive coating and electrode, as well as one or more temperature sensors).
  • the connectors described for the temperature sensor and the electrodes may all connect to a controller, as described in more detail below, for controlling the temperature of the plate (e.g., the wells and/or the lid or top of the plate).
  • any appropriate sensor may be used to help monitor and control the environment within one or more of the wells of the plate.
  • the sensors may include non-invasive sensors (e.g., optically-based sensors, or sensors that detect properties from outside of the wells of the plate), and contact-type sensors, that may be located within the well, and may contact the cells and/or culture media within the wells.
  • sensors located within the wells may be "read” (e.g., sensed) by one or more transducers located outside of the wells, preventing contamination.
  • Sensors may particularly include sensors for detecting or sensing non- temperature parameters (as described in more detail below).
  • non-temperature parameters include parameters that may be affected or modified by temperature (and thus may reflect temperature or have temperature information extractable therefrom).
  • Examples of typical sensors may include pH sensors (e.g., off-the-shelf pH sensor such as phOptica, distributed by WPI and manufactured by PreSens Precision Sensing GmbH, and sensors from FluorometrixTM may be used), dissolved O 2 sensors (e.g., OXYMINI/OXYMICRO sensors distributed by WPI and manufactured by PreSens Precision Sensing GmbH, or FluorometrixTM sensors), optical sensors (e.g., optical imaging microscopes, cameras, etc.), cell counters (e.g., commercially available cell counting system such as ApplitekTM's cell counting system).
  • US 6,673,532 and US 6,602,716 (incorporated by reference in their entirety herein) describe additional examples of sensors and systems including sensors; this description is not limited to any particular type of sensor.
  • FIG. 9A and 9B show different variations of a cell counter that may be used as one of the sensors described herein.
  • FIG. 9A shows a schematic of a side-on optical cell counter that may be used with the plates described herein.
  • One (or all) of the wells may pass light (e.g., at a selected wavelength, ⁇ ).
  • the well may include windows (to allow light to pass through it), or it may be at least partly transparent, at least to the wavelength(s) used to count cells.
  • the cell counter may pass light from a light source, through the solution including the cells, where it is detected by a detector.
  • the light may pass through a known path length (PL).
  • the concentration of cells in the well may be derived from the relationship:
  • (F) is a factor for the cell type to be determined (that may be determined experimentally (for example, by constructing a calibration curve based on counting with hematocytometer)
  • Ab is the absorbance (e.g., at a particular wavelength, ⁇ )
  • B is the path length (PL)
  • C is the concentration of cells. Based on this relationship, it is apparent that the sensitivity of the cell counter doubles with a doubling of path length. For example, if we assume that the factor F is 0.001 for a cell type, and if there are 1000 cells/ml, then for a path length of 1.0 cm, the absorbance is 1.0; when the path length is 2.0 cm, the absorbance is 2.0.
  • any appropriate light source may be used as part of the cell counter.
  • the light source may be a lamp, a laser, a diode, etc.
  • the light source may be incorporated as part of the plate.
  • the detector may also be incorporated as part of the plate. In some variations, both the light source and the detector are incorporated as part of the plate.
  • the light source may include a lens to spread or focus the light and thereby increase the region illuminated; a lens may also be used on the detector.
  • an aperture may be used as part of the light source or the detector to limit the region of the light detected or emitted.
  • FIG. 9C shows two different arrangements of emitters and detectors that may be used as part o the cell counter.
  • a cell counter with turbidity may also be used as part of the cell counter. This method may be particularly appropriate when measuring cells in suspension. Measuring light scattering to determine cell concentration may be derived because absorbance of some wavelength(s) of light may be proportional to the concentration (e.g., number) of cells in a well. For example, absorbance (Ab) may be expressed as:
  • a reasonable wavelength of light that can be used is between about 540 and 650 nm. As the density of cells increases, the absorbance will increase.
  • FIG. 9B shows another arrangement of a cell counter in which the detector is located below the well of a plate, and the light source is located above, so that light passes through the well from the top to the bottom. As a selected wavelength of light passes through the liquid in the well, light is absorbed depending on the concentration of cells. The detector typically measures absorbance at the particular wavelength (e.g., 540 nm). The beam size may vary to match (or fit with) the size of the wells in which the cells are being measured. Further, the high of the liquid may also be chosen to optimize (or improve) the path length (since the absorbance may improve as path length increases).
  • the cell counter may be part of the plate (as described above), or the plate may be adapted for use with a cell counter or reader.
  • the plates may include a window of transparency through which the cell counter may read cell concentration.
  • the cell counter may operate in any appropriate direction, including through the well from the top to the bottom (or vice versa) or through the sides of the well.
  • Sensors may also be used to determine the concentration of material released from cultured cells or tissue (e.g., by secretion, lysis, secretion, etc.).
  • a sensor may determine the concentration of proteins, hormones (e.g., steroids), nucleotides (e.g., DNA, RNA, etc.), carbohydrates, lipids, etc.
  • Sensors may be electrical (e.g., electrochemical), optical, or chemical.
  • a sensor may be enzymatic, and include an enzyme (including a localized or tethered enzyme).
  • the sensor determines concentration by an optical immunoassay.
  • FIG. 10 illustrates one variation of an optical immunoassay that may be used as part of a sensor with the plates described herein.
  • a patch immunoassay may be used to detect (in real time) the presence or concentration of a product, for example, when the plate described herein is operating as a mini- bioreactor.
  • Product e.g., proteins, steroids, etc.
  • a region e.g., a patch, spot, ring, etc.
  • a region within the well may be configured as a sensor to detect the product by coating an antibody (e.g., a monoclonal antibody) directed against the target.
  • a sensing agent e.g., an antibody
  • a material e.g., nylon, glass, etc.
  • the antibody may be coated or bound by any appropriate method (as well known in the art of immunoassays), including binding to a secondary antibody (which may provide some amplification of the signal).
  • FIG. 1OA shows a binding agent configured as an antibody that is bound to a spot within the bottom of the well.
  • this antibody may be a monoclonal antibody directed against the product (or a region of the product).
  • the antibody is attached to the inside of the glass or plastic wall of the bioreactor well (e.g., multi-well culture plate). Standard coating techniques may be used, including sucrose preservation. After the antibodies have been attached to the spot so that the binding domains (arms) may still bind to target (e.g., product), purified displaceable target molecules which include an indicator such as a fluorescent molecule (fluorophore) are bound to the antibody, as shown in FIG. 1OB. Any appropriate indicator may be used.
  • target e.g., product
  • purified displaceable target molecules which include an indicator such as a fluorescent molecule (fluorophore) are bound to the antibody, as shown in FIG. 1OB. Any appropriate indicator may be used.
  • fluorescent molecules may be used, particularly fluorescent molecules that do not readily “bleach” (e.g., lose their fluorescence).
  • the displaceable target molecules may be bound by the antibody with the same affinity as the product (target) molecule, or the antibody may have lower binding affinity for the displaceable target molecule.
  • This provides "loaded” product-sensors that may be incorporated into the well for optically detecting the presence of product. These loaded detectors may be dried and reconstituted within the well before use. In some variations, the detectors may be equilibrated.
  • the sensors detect the presence of the target product based on the binding kinetics of the target product to the antibody.
  • the target product displaces the fluorescently labeled displaceable targets that were pre-loaded onto the sensor.
  • the fluorescence within the well can change depending on the concentration of the product made by the cells.
  • the presence of unlabeled target product in the bioreactor will displace the florescent target bound to the antibody, dispersing the florescent marker into the well (mass action).
  • Displacement of the displaceable fluorescently labeled product is inversely proportional to binding of the unlabeled target product.
  • the florescence of the spot or region will decrease as more unlabeled target binds to the antibody, in a concentration-dependent manner.
  • FIG. 1OC illustrates this relationship.
  • FIGs. 1OD and 1OE illustrate another variation of the sensor configured to detect product.
  • a sensor patch region 1011 is shown with an antibody attached.
  • this patch immunoassay takes advantage of the binding kinetics of the product (or products) formed in the bioreactor, and is capable of real-time detection and monitoring.
  • the sensor may benefit from begin present within the bioreactor. For example, since the sensor takes advantage of the kinetics of binding of the product, the use of the sensor directly within the bioreactor allows many of the other properties of the bioreactor to enhance the sensor function.
  • the bioreactor environment may be temperature controlled, and the geometry (e.g., small volume) of the bioreactor, as well as the ability to provide mixing within the bioreactor further enhance the function of this sensor, and may also allow continuous monitoring.
  • the sensor (patch immunoassay) comprises a binding agent that is immobilized (e.g., fixed) to the bottom of the patch.
  • the binding agent 1020 is at least partly free to bind a target.
  • a reporter molecule (1015) is a florescent marker that is attached to a low-affinity binding molecule. The marked low-affinity binding molecules are pre-loaded onto the binding agent/sensor.
  • a newly secreted target molecule e.g., an IgG molecule
  • a newly secreted target molecule e.g., an IgG molecule
  • This change in the florescence is detectable, and can be correlated to the concentration of target, based upon this displacement.
  • any appropriate binding agent 1020 may be used as part of a sensor.
  • the binding agent immobilized as part of a patch immunoassay may comprise an IgG species IgG antibody, such as an ⁇ -mouse or an ⁇ -human IgG antibody.
  • the binding agent is a Protein A staphylococcal or recombinant (e.g., an IgG specific binding agent).
  • the binding agent may be a Protein G (e.g., E. coli or recombinant) Fc binding agent.
  • the binding agent comprises a Protein A/G prom bacilius or recombinant that binds all human IgG subclasses.
  • the binding agent need not be an antibody directed against the specific target molecules produced in the bioreactor.
  • the binding agent may be broadly directed against any antibody, or subtype of antibody (e.g., human or mouse IgG).
  • This patch immunoassay sensor technique thus allows for continuous monitoring of product formation within a well of the bioreactor.
  • Any appropriate detector may be used with the product sensor described.
  • a fluorescent emitter and detector (capable of detecting the fluorescent marker on the displaceable target molecules) may be used.
  • the product sensor immunoassay e.g., the antibodies
  • the product sensor immunoassay is bound to a transparent substrate so that they may be imaged through the well. It should be clear, however, that the substrate does not need to be clear, and the antibody may also be bound to a non-transparent substrate.
  • an immunoassay (patch) product sensor may be used to detect hybridoma product expression, including real-time detection.
  • a patch immunoassay may be configured to monitor many different hybridoma products, including (but not limited to) proteins such as antibodies, insulin, cytokines, etc.
  • a patch sensor may include any appropriate immunoassay.
  • the detection format may be based on a solid phase type assay, a liquid phase binding type assay, or a hybridoma product.
  • a product-binding partner may be bound to a substrate (e.g., the "patch" at the base of a well).
  • the binding partner may be specific (e.g., a product-specific antibody), or a general product binder.
  • the amount of product may be determined by displacement of a labeled competitive binder.
  • a capture element product binding partner
  • the patch may include a non-florescent antibody bound to the patch or bound to a bead (including a florescent bead).
  • This first-layer antibody may be an antiidiotype antibody (to bind any produced antibody) or a product-specific antibody (e.g., an anti- insulin antibody).
  • the first-layer antibody is pre-loaded with a labeled competitive binder that binds with the first layer antibody.
  • the labeled competitive binder may be fluorescently labeled insulin.
  • the first-layer antibody is goat anti-mouse IgG antibody, then the labeled competitive binder may be fluorescently labeled IgG.
  • a product sensor may also be based on detection of Florescence Energy Transfer
  • FRET immunoassays involve the transfer of energy from a donor molecule to an acceptor molecule. FRET typically detects when a molecule that is fluorescently labeled with a first fluorophore is brought into close proximity to a molecule that is fluorescently labeled with a second fluorophore. If the excitation profile for the first fluorophore overlaps with the emission profile of the second fluorophore, then when the two labeled molecules are in close proximity (e.g., typically within less than 0.01 ⁇ m), excitation of the second fluorophore will cause excitation of the first fluorophore.
  • excitation of the first fluorophore will cause excitation of the second fluorophore when the two are in close proximity.
  • the proximity-dependent excitation of the one of the fluorophore is one variation of FRET. FRET may be used to provide highly sensitive detection of binding (and therefore concentration).
  • FIG. 12A and 12B show one example of using FRET as part of a product sensor.
  • Protein A acts as a bound capture element 1201 as described above, because it can bind to the product being produced in the well/bioreactor.
  • the capture element may be labeled directly, or it may be bound to a florescent bead, such as a florescent latex bead 1203, as shown.
  • a florescent latex bead may have a diameter of between about 0.1 to 20 ⁇ m.
  • the florescent bead (or otherwise fluorescently labeled capture element such as an antibody or target binding partner) is labeled with a fluorophore 1207 that has an excitation wavelength of "X" ⁇ m and an emission wavelength of "Y" ⁇ m.
  • free Protein A is also present in the solution, and is labeled with a second fluorophore 1209 which has an excitation wavelength of "Y" ⁇ m and an emission wavelength of "Z" ⁇ m.
  • a second or different capture element is used as the free (unbound) capture element, preferably a capture element binding to a different region of the product. Unlabeled product is released into the well, where the product sensor may detect and measure it.
  • the product 1211 when the product 1211 is released into the well it may be bound by both the free 1205 and the tethered 1201 capture agents, bringing the two different fluorophores 1207, 1209 into proximity so that when the sensor is excited with a wavelength of "X" ⁇ m, the signal at wavelength "Z” ⁇ m indicates that the product is bound and FRET will occur, as shown in FIG. 12B.
  • the florescence intensity may be proportional to the amount of product in the well.
  • the product may be labeled as it is produced, for example, by incorporating florescent regions (e.g., GFP, etc.). Any appropriate florescent label may be used, or appropriate pairs of florescent labels.
  • the labels 1207, 1209 maybe, e.g., dyes such as Rhodamine, FITC, cy3, cy5, etc., dye proteins such as GFP, PE, etc., latex beads, quantum dots of any available size and color, gold nano particles, etc.
  • the florescent colors utilized may include, but are not limited to ultraviolet, visible, infrared, near infrared, etc.
  • monoclonal IgG may be synthesized from hybridoma cells in culture using a FRET based immunoassay.
  • Hybridoma cells may be cultured in suspension at 37 0 C and 5% CO 2 with necessary nutrient feed, as described elsewhere herein.
  • the hybridoma cells may produce IgG molecules in solution. Synthesis of IgG may be monitored as it is released into the well using the product sensor described above.
  • Protein A can be covalently coupled to a 6.7 ⁇ m microsphere that emits florescent light at ABC nm when excited by light at XYZ nm.
  • Protein A coupled beads may be held in a porous patch that can be interrogated by a source of XYZ nm light with quantification of ABC nm emission.
  • IgG is synthesized and secreted into the medium by the cultured hybridomas the IgG molecule will be labed on their Fc portions with quantum dots coupled to Protein A.
  • the 'Protein A quantum dot IgG" complex is free in solution, and can also bind the Protein A coupled latex beads in the porous patch, as described above.
  • binding will be quantified via a FRET event that generates photons as a consequence the Protein A quantum dot IgG complex binding event.
  • the extent of the FRET event may be proportional to the concentration of the IgG present in solution and will be used to directly quantify, from calibration data, the number of molecules of IgG present in solution.
  • Sensors may be connected to a control unit which may use the sensor information to regulate one or more operation of the smart plate.
  • sensors may monitor the level of media within the wells (e.g., an optical detector may detect the meniscus of media within the well), and may output to a controller.
  • the controller may include control logic for regulating the amount of fluid within the well based on (at least) the output of the optical sensor.
  • the controller may cause the valves connecting the ports of the wells to the medium source, and allow more medium to be provided. Once medium gets too low, the entire process may repeat itself. Similarly, if the well gets too full, a drain port may be used to remove excess medium.
  • the control unit may also record or further analyze data from the sensor.
  • the control unit may be connected to the plate by an electrical lead (e.g., a wire) or by a wireless connection.
  • the same control unit may be used to control a plurality of plates.
  • a control unit may be on-board the plate.
  • the control unit may comprise software (e.g., analysis or control decision logic).
  • the control unit may also be programmable.
  • the control unit may permit user-entered temperature control, flow rates (e.g., flow of material through the ports), wash cycles (again controlling flow of fluid in and out of the ports), and temperature/feeding/treatment cycles.
  • the control unit may also integrate with any other portion of the system, including an imaging unit (e.g., microscope), to control the applied light (e.g., white-light, UV-light, etc.) for time-lapse or extended recording periods.
  • an imaging unit e.g., microscope
  • the control unit may receive user input.
  • the control unit may interface with a computer (or may be part of a computer).
  • the control unit may communicate with commercially available software such as LabViewTM (National Instruments).
  • the controller may include separate controller logic.
  • the controller may regulate, for example, the pH of the solution (e.g., by monitoring the pH directly and responding, or by controlling the CO 2 /O 2 mixture), the addition of drug (e.g., experimental or treatment drug), the addition of new media, the removal of media, or the removal of sample (e.g. aspiration of material from the cell culture).
  • a single multi-purpose regulator may be used to control (and or store and analyze) all or any of the features described herein, separate (e.g., dedicated) controller units may also be used.
  • any appropriate control unit may be used with any of the plates described herein, including plates having any of the sensors (or none of the sensors).
  • a control unit controls only the temperature of the plate.
  • the control unit may include one or more connectors (e.g., plugs) for connecting to the electrodes that heat the plate (and/or the lid of the plate).
  • the control unit may also connect to the temperature sensor or sensors.
  • the control unit includes a display for indicating the temperature (actual or relative temperature) of the plate or regions of the plate (e.g., individual wells or the lid).
  • the lid and the base of the plate include separate temperature controls, and each region (the lid and the base) include a separate temperature sensor.
  • the temperature control e.g., connecting to the electrodes
  • the temperature detector both input into the controller. An operator may monitor and adjust the temperature using buttons, dials, switches, etc. on the controller.
  • the controller controls both the temperature and the application of a gas mixture (e.g., 5% CO 2 ) to the plate.
  • a gas mixture e.g., 5% CO 2
  • the controller receives input from the user to adjust the temperature (e.g., the temperature of the bottom of the plate and/or the lid), as well as the rate that a gas mixture is applied.
  • the rate of the gas mixture may be adjusted using the controller.
  • a controller may include a meter or display indicating the current gas flow/pressure, and the user may adjust it either manually (monitoring the effect on the current gas flow) or automatically.
  • a target (or target range) of gas flow may be selected by the user, and the controller may automatically adjust the gas flow to be within the target range.
  • the controller may include a detector for detecting the gas flow, as well as an indicator.
  • the temperature(s) may also be similarly controlled.
  • the controller typically includes control logic for controlling the gas flow and/or temperature.
  • each well may include one or more sensor, as described. These sensors may be used to detect multiple different parameters. Each sensor may be individually activated (e.g., excited), and the signal or response detected, and the response analyzed. The steps of activation, sensing, detection, and analysis may be performed separately for each sensor, or they may be combined. For example, multiple sensors may be activated by a single activation, and multiple sensors may be detected by a single detector. Any or all of the sensors described herein may be included or may be incorporated as part of each well.
  • Each sensor may be activated, detected and analyzed independently.
  • a sensor in a well may be activated (e.g., by emitting light of a particular wavelength) to excites a fist optical sensor (e.g., a p ⁇ 2 sensor).
  • the response of the sensor e.g., absorption and/or emission
  • the response typically reflects the characteristic of the system or a parameter of the culture conditions within the well (e.g., pH, p ⁇ 2 , pCO 2 , etc.).
  • a second round of activation/sensing/detection/analysis may then be performed on the same or a different sensor.
  • a sensor or sensor may be activated/detected/analyzed in each well selectively, simultaneously (e.g., in parallel), sequentially, or some combination thereof.
  • all of the pH sensors in a plate of multiple wells e.g., multiple micro- bioreactors
  • another sensor e.g., p ⁇ 2 sensor
  • multiple sensors are activated, sensed, detected and analyzed at the same time in a single well.
  • the plates described herein may also include mixers (e.g., magnetic mixers) for agitating material (e.g., medium) within the wells.
  • mixers e.g., magnetic mixers
  • material e.g., medium
  • an entire plate may be mixed or agitated by moving the entire plate.
  • each well of an entire smart plate may be mixed by placing it on a rocker or shaker. However, it may be desired to mix only some of the wells, or to mix material within the wells while the rest of the plate remains stationary (allowing visualization, etc.).
  • individual mixing may be achieved within each well of the plate by including one or more integrated stirrers operably connect to one or more of the wells.
  • an integrated stirrer may be an integrated magnetic stirrer having a multi-pole magnetic source that at least partially surrounds a well of the tissue culture chamber.
  • mixing of liquid within the wells may be performed using paramagnetic beads for non-contact mixing.
  • These mixers may also be referred to as stirrers.
  • the plate may include one or more magnets configured to move the magnetic beads (or some other magnetically responsive stirrers) within the media to agitate the media. By alternating the magnetic force applied to paramagnetic beads within the media of a well, the media can be mixed as the beads are moved back and forth within the well by the action of the magnetic forces applied.
  • FIG. 4A shows one variation of a smart plate including a controllable magnetic stirrer as described.
  • the plate includes a multi-pole magnetic ring extending at least partly around the well, as shown.
  • the activation of the magnet can be determined by noting the time that a bead may take to travel, t. The polarity on electromagnet may thus be changed to keep force F constant. This makes bead travel in the opposite direction making one complete cycle.
  • the force F is changed up or down based on desired cycles.
  • a well's micro electromagnetic polarity may be changed electronically (e.g., by the control unit connected to the source of the magnetic field (e.g., the multi-pole magnetic ring shown in FIG. 4A).
  • Electromagnets may be provided in any appropriate position, typically outside of the well (e.g., the top, sides, bottom of the wells, the lid, etc.), and in any appropriate arrangement.
  • the electromagnetic comprises a multi-pole magnetic ring around each well.
  • the multi-pole magnetic source may form a portion of the well body.
  • FIG. 4B shows a well including magnetic or paramagnetic beads 403 that are acted on the by the multi-pole magnetic source, as described above.
  • FIG. 4C shows different variations of stiffing beads, including round 407, barbell 409, and oblong 411.
  • the shape of the beads may be optimized to increase the surface area, thereby increasing drag volume which (in return) will increase mixing efficiency.
  • round beads may be used, or beads having cavities, projections (e.g., "arms”) propeller-shapes, concave surfaces, or the like.
  • the shapes may be limited to fluidic height and may be small enough to minimize blockage of the optical path when at rest, allowing imaging or image based cell counting time.
  • the beads may be rested at any one of the poles.
  • Shapes of different sizes and shapes may be used (e.g., a range of shapes and sizes) at the same time.
  • multiple sized paramagnetic beads, of various shapes may be used with an electromagnetic ring located outside of the optical path of the plate.
  • the beads may comprise a magnetic or paramagnetic material.
  • Beads may also be sterile or sterilizable to prevent interference with cell culture embodiments.
  • the beads may be coated with a protective layer (e.g., a biologically inert layer, such as a latex or other plastic).
  • a single bead (or stirrer) is used, or multiple stirrers may b used.
  • the stirrer may correspond to a magnetic or paramagnetic shaped bead.
  • a single propeller may be propeller-shaped or have one or more surfaces configured to push fluid. Any appropriate shape may be used.
  • the stirrer may be configured to float within the medium of the well, or on top of the well. In some variations, the stirrers are configured to rest on the bottom of the well. The stirrers may be small and light enough so that they are suspended within media of the well, so as not to interfere with adherent cells.
  • the electromagnets acting to move the stirrer may be positioned above the bottom of the well (e.g., slightly above the bottom of the well).
  • mixing within a well of the plate may be performed by placing the beads within the well containing a fluid (e.g., culture medium), and turning on the magnetic field to cause the creation of a magnetic pole ("A") at one or more parts of the electromagnet source.
  • the magnetic pole "A” may be maintained in a stable position for a predetermined amount of time (e.g., "t” or a fraction oft”). In some variations, the magnetic pole "A" may move in a continuous fashion.
  • the magnetic pole "A” is turned off, and a new magnetic pole "B" (typically located on an opposite end of the well) is turned on for the predetermined time "t" (or a fraction oft”).
  • steps of turning on and off poles "A” and “B” may be repeated, causing the magnetic or paramagnetic beads to move within the well. Any type of motion (e.g., around the perimeter of the well, across the well, up or down, etc.) may be directed by controlling the electromagnetic source, guiding the beads.
  • the stirrer beads may be resident in the well (e.g., they may be included as part of the well prior to adding media, samples, etc.) or they may be introduced thereafter.
  • beads may be introduced through one or more ports of the well.
  • the mixing system described herein may be used as part of a smart plate as described herein (e.g., as part of a micro-titer plates, microarray, micro-, mini- or large- bioreactor built in plastic, glass, silicon or any non-magnetic materials).
  • Software or magnetic stirring control logic may also be used to control the stirring of the magnetic stirring described.
  • the smart plates (or slides) described herein may be used as part of a system.
  • Systems including the multi-well plates described herein may include systems for monitoring, imaging, culturing, labeling, or the like.
  • FIG. 2 shows one variation of a system for culturing and monitoring live cells including a controllable plate as described herein.
  • the plate used with this system may include any of the features (e.g., sensors, temperature control, flow control, etc.) described.
  • the plate is used with a real-time imaging platform based.
  • the smart plate conforms to a standard 6-well micro titer plate format, and includes temperature control and regulation of gases such as O 2 /CO 2 /N 2 (and regulation of pH).
  • This system allows researchers to take time-lapsed images of adherent cells over an extended period, while the plate is on an inverted microscope, without requiring that the plate be taken in and out of the incubator both in perfusion and static nutrient flow conditions.
  • the plate is connected to a control unit which regulates the flow of media, the temperature of the plate, and may interface with the microscope, as shown.
  • a computer may be used to interact with the microscope (e.g., storing digital images, etc.) and/or the control unit for the smart plate.
  • the system shown in FIG. 2 includes three primary components: a disposable smart plate (cell culture slide), a controller (e.g., controller unit), and the control software (e.g., "smartware" software controlling the smart plate).
  • the bottom layer of the multi-well plate (slide) in this example is coated with a conductive thin film layer (e.g., ITO) to provide stable heating of cell culture walls.
  • a controller connects to a computer and using control software, manages the temperature of the slide as well as CO 2 and nutrient flow at programmed levels to approximate the natural host environment of the living cell.
  • This system may integrate into existing imaging platforms and may be adaptable to individual system needs. For example, when using an inverted microscope with an oil immersion objective, the system may include a simple but effective heater for the objective lens.
  • this system may make it possible to investigate, in real-time, biological questions that are either temperature and/or time dependent by approximating an in-vivo environment under the microscope.
  • controllable multi-well plates described herein are not limited for cell culture or imaging uses.
  • the smart plates may be used in any situation where it is desirable to provide a plate having one or more wells (especially small wells or wells having small volume), where the plates include on-board control of any of the following features: temperature controlled; fluid flow (into or out of the well) control; monitoring (e.g., optically or by any other appropriate sensor) of conditions within the well environment; and/or stirring of material (e.g., liquid) within the well.
  • Example of applications which may benefit from these plates include, but are not limited to cell culture applications (e.g., culture of bacteria, tissues, etc.), growth or culture of antibodies (e.g., monoclonal, polyclonal, etc.), purification of antibodies, miniature bioreactors (e.g., fermentation, production of proteins, etc.), purification of water, testing for pathogens (in air or water), testing or screening of drugs (including bioreactivity and bioabsorption of drugs in different tissues), cell labeling or staining (including immunihistochemical applications), etc.
  • cell culture applications e.g., culture of bacteria, tissues, etc.
  • growth or culture of antibodies e.g., monoclonal, polyclonal, etc.
  • purification of antibodies e.g., monoclonal, polyclonal, etc.
  • miniature bioreactors e.g., fermentation, production of proteins, etc.
  • purification of water testing for pathogens (in air or water), testing or screening of drugs (including bioreactivity
  • the multi-well smart plates described herein can include cultures of tissue types from different portions of the body (intestinal, vascular, liver, neuronal, etc.). The effect of identical concentrations of a drug on all of these different tissue types may be assessed by adding drug to them all simultaneously.
  • the effect of any drug byproducts may be assayed by adding drug first to the well including the tissue that would see the drug first when taken by an intact subject (e.g., the stomach/intestinal tissue), and then transferring media from this well into wells containing tissue cultures from downstream tissues.
  • This novel assay may therefore allow the investigation of the effect of bioabsorption of the drug in different tissue types, as well as the effect of any potential metabolic byproducts of the drug which may result from one or more tissue type.
  • multi-well smart plates may be used as part of a small-scale multi-fermentor system.
  • each well of the multi-well plate may individually regulate a micro-environment for the growth of cells (e.g., bacteria). Since the wells may be isolated from each other, many parallel fermentation processes can be run simultaneously, with little risk of cross-contamination.
  • samples of the bacterial culture may be removed (e.g., from one of the ports, including a filtered port) and tested. Bacterial growth may be optimized and controlled.
  • a multi-well plate as described herein may be produced or manufactured in any appropriate way, including blowing, molding, and CNC manufacturing.
  • the multi-well plates described herein may be manufactured by injection molding.
  • individual component parts of the multi-well plates may be injection molded (en masse or individually) and assembled. Injection molding is typically inexpensive and accurate, and may be allow a wide range of materials (e.g., polymeric materials) to choose from.
  • FIG. 18 shows an example of an exploded view of all of the parts of a single multi-well slide, as described herein.
  • the individual components may be assembled (manually or by an automated process).
  • the lid includes a removable RTD (temperature sensor) assembly 1801 (e.g., similar to the mount shown in FIG. 17), that engages the molded lid 1807.
  • An ITO coated heater glass 1805 is attached to the molded lid 1807, and a lid flex circuit 1803 forms an electrical contact with the electrodes on the ITO coated glass 1805.
  • the lid may engage the outer shell 1809 of the plate using snap clips which may be incorporated into the molded lid.
  • the lower half of the plate is assembled by attaching or overmolding left 1813 and right 1815 septum material (e.g., formed from a relatively soft elastomeric material) into the inner shell 1817, placing the seals (o-rings) 181 1 in contact with the inner shell 1817, and then mounting the lower heater 1819 (a glass plate coated with ITO) with attached flex circuit 1821 and plate RTD assembly 1823 when snap clamps are used a corresponding receptacle must be provided for each clamp in the outer shell.
  • septum material e.g., formed from a relatively soft elastomeric material
  • Manufacture of a multi-well slide as described in FIG. 18 may include the following steps: forming individual parts; overmolding the inner shell 1817 with the left and right sides 1813, 1815 to form a septum; inserting the inner shell 1817 with attached seals 1811 into the outer shell 1809 to form the plate assembly; installing the heater assembly (coated plate 1819, attached electrodes 1821 and RTD assembly) into the plate assembly.
  • the lid is a separate assembly which consists of heater assembly (coated glass 1805 and attached electrodes 1803 and RTD assembly) into the lid frame 1807.
  • the finished lid assembly may be installed by the customer after the live cells and media are inserted into the plate.
  • the outer shell 1809, inner shell 1817, lid frame 1805, and lid and plate RTD assemblies may be injection molded.
  • the plate (or well) flex circuit may be constructed as known in the art.
  • the flex circuit may be formed of layers of polyamide and copper. Positive and negative contact layers (e.g. a positive and a negative plane) may be layered so that contacts can be exposed to connect to the conductive layer (e.g., ITO).
  • a stiffener may be used to stiffen the flex circuit, and connectors (e.g., connecting the flex circuit to wire and thus a power supply) may be soldered on.
  • the well heater assembly is assembled by first cleaning the
  • ITO coated class then silk screening the electrodes with conductive epoxy and flash curing them. Silver epoxy may then be applied to the contacts of the flex circuit, and the entire assembly may be cured at 125 0 C and baked flat until cured. The same general process may be used to form the top heater assembly (micro-heater) as well.
  • a smart slide plate (or well) assembly may be built by pressing the inner shell
  • the inner and outer shell may be friction fit, or may include mechanical engagements to secure the two together.
  • an adhesive may be used to secure the inner and outer shells together.
  • the inner shell and the outer shell may create one or more air gaps between them, which help thermally isolate the wells of the plate from the surrounding temperature.
  • an air gap may separate the bottom of the well (e.g., the glass bottom) from the surface on which the plate rests (e.g., microscope stage). The air gap may extend around the individual wells, or one or more separate air gap(s) may be formed around them.
  • the plate heater assembly may be glued to the well assembly using silicone adhesive.
  • a connectors e.g., a flex cable
  • the lid assembly (including a lid heating assembly) may be assembled in the same fashion.
  • a seal such as an o-ring seal is included between the lid and the well assembly.
  • the lid or the well assembly may include a seat or contact for holding a seal.
  • an elastomeric (e.g., rubber, silicone, etc.) o-ring seal may be inserted around an inner perimeter of the inner shell of each well of a plate. When the lid is closed over the plate, a lower edge of the lid engages the o-ring, forming a seal.
  • a multi-well slide comprises a 6-well slide that is SBS compliant, having dimensions 5.0" X 3.3".
  • This plate is connected to a fluid controller (that has dimensions 12.00"L X 12.00"W X 3.5" H) and an electronic controller (having dimensions 5.5" W X 12.00"D X 12.00"H).
  • the plate also includes a micro-heater as described above, capable of regulating the temperature between about 3O 0 C - 50 0 C +/- 0.10 0 C.
  • the plate includes a heated lid. The heated lid also regulates temperature between about 3O 0 C - 5O 0 C +/- 0.10 0 C.
  • the system may also include a microscope objective lens heater that controls the temperature of the objective (e.g., oil or water) over the same range of temperatures (3O 0 C - 50 0 C +/- 0.10 0 C ).
  • a power supply e.g., 12V/10W
  • the plate e.g., base and lid, or objective heater
  • the system may include a CO 2 humidifier bottle heater that regulates the temperature of the supplied gas over the temperature range of 3O 0 C - 50 0 C +/- 0.10 0 C.
  • This system may also include one or more alarms for signaling when any of the environmental parameters are outside of a preset range. For example, when the CO2, temperature, well volume flow rates, etc. exceeds some allowable range (or optimal range for cell growth).
  • the flow control e.g., though the port into or out of the wells
  • Flow from the drain may proceed at approximately 0.052 mL/sec.
  • a proof-of-concept experiment was done comparing an incubator using a standard (e.g., passive) multi-well plate with a smart multi-well plates as described herein, in which temperature and CO 2 /O 2 were regulated on-plate.
  • a standard e.g., passive
  • CO 2 /O 2 were regulated on-plate.
  • researchers at University of Southern California in the Keck School of Medicine use the development of chicken skin appendages as a model for organogenesis (see references 1 and 2).
  • Embryonic skin explants are monitored for the appearance of dermal condensations seen as dark circles on the skin. These researchers study the signal process between the dermis and the epithelium that leads to the fundamental organization of periodic patterning for feather development.
  • one variation of a 6-well smart slide was used to monitor dermal condensations in chicken skin cultures.
  • Embryonic day 6.5 skin explants were grown in HEPES buffer (10 uM) with Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum plus gentamycin (diluted 1 :1000). Tissues were placed into the bottom of Cell Culture Inserts with 0.4 u membrane bottoms (BD #35 3039) and placed into either standard 6-well Falcon tissue culture plates or the 6-well smart slide. Cultures were grown for 17 hours in either a humidified incubator at 37 deg C (Falcon plates) or in the free standing smart slide. Time-lapse video images of the explants in the smart slides were taken at 15- minute intervals in order to assess the development and overall health of the tissues.
  • DMEM Dulbecco's Modified Eagle's Medium
  • FIGs. 5A and 5B show the feather bud formation at 0 time (Fig 5A) and at 17 hours (Fig 5B) in the Falcon plate.
  • FIGs. 6A and 6B show a side-by-side comparison on explants grown in the incubator (control 6A) and the smart slides (6B).
  • the smart slide is an ideal tool for long-term cell imaging; and cell culture growth when long term optical or metabolic monitoring is required.
  • Experimental conditions may be entered into computer software for controlling temperature, gas and nutrient flow during the duration of the experiment.
  • Wells may be filled and emptied at times selected by the user or run into the wells in a continuous mode. Nutrient and gas into each well are independently controlled.
  • the 170 ⁇ thin optically clear well bottom (in this example) allows both light and fluorescent microscopic imaging.
  • An objective heater and sensor may be used to fit onto any standard lens for oil immersion work. Temperature and liquid flow rates may be recorded for the duration of the experiment (minutes or days) and provide a complete printed record for documentation.
  • long-term imaging experiments may be performed in an operator independent mode.
  • this system may allow advantages such as: study of live adherent cells for long term imaging; 6-well formatted, micro-incubator-in-microtiter-wells; adherent cells, tissues, infected cells, etc. can all be handled with no cross contamination; real-time nutrient flow, temperature, CO2 may be tracked by well; inverted microscopes may be used to monitor development.
  • FIG. 3 shows another variation of a smart multi-well plate in which a number of sensors are included.
  • the plate 1 is shown as a six- well plate, wherein each well 2 is an inner diameter of 35 mm and a depth of 19 mm.
  • a single well is shown schematically in cross-section (indicated by the arrow 2).
  • This well includes a cover and four ports passing through the wall for applying or withdrawing fluids (e.g., media, gasses, drugs) to or from the well.
  • a NaOH ⁇ -pump which may operate at 160 nL/pulse
  • a gas supply e.g., O 2 supply
  • Media can be applied through a feeder port 7, and samples of media (or excess media) may be removed through the sample port 8.
  • Each well of the example shown in FIG. 3 may also include sensors for detecting characteristics of the environment within the well.
  • the well includes a pH Sensor 3, and a dissolved O 2 sensor.
  • These sensors comprise an emitter and a detector that pass light through the well (since the bottom and top are at least partially transparent), and detect pH or dissolve O 2 based on the absorption through the media within the well.
  • Non-contact sensors such as these are commercially available from, e.g., FluorometrixTM). Of course, other sensors may be used, including sensors within the well itself.
  • the well of FIG. 3 also includes a cell counter 1 1 for optically counting cells within the well (e.g., based on optical density, a ratiometric determination of cell density).
  • the sensors and/or a temperature control, as well as the control of the valves and ports described above) may all be controlled and monitored by a controller 9, which may be connected to a computer.
  • a controller 9 which may be connected to a computer.
  • systems including multi-well plates may include additional components such as imaging systems, microscopes, output devices (printers, etc.), storage devices (e.g., memory, disks, RAM, etc.), control software, analysis software, or the like.
  • the devices described herein may also be configured as a micro-bioreactor (or micro-fermenters).
  • a single well, or multiple wells including any (or all) of the features described above may be configured for complete optimization of a bioprocess, including production of cells, or production of cell byproducts from cells.
  • Such "micro" bioreactors may be used to determine or optimize growth and culture conditions, and may be used to guide optimization before scaling up to a large (e.g., 1000 L or greater) batch size, beginning with ml size batches. In the past, reactor optimization was commonly done with 1000 mL flasks, leading to waste and expense.
  • the plates When the plates are used as micro bioreactors, many (or all) of the components may be incorporated into a small-sized plate into a comprehensive design system.
  • the plates may include control of temperature, agitation (stiffing) addition of gasses and gas mixtures (e.g., O 2 , CO 2 , N 2 , etc.), detection of product, detection of pH, etc.
  • gasses and gas mixtures e.g., O 2 , CO 2 , N 2 , etc.
  • a micro-bioreactor may include any of the following features: multiple wells, cell imaging, temperature control, media control, gas exchange, media adjustment, disposability, reactor well mixing, cell number counting, pH monitoring and/or adjustment, pCO 2 monitoring and/or adjustment, p ⁇ 2 monitoring and/or adjustment, and product monitoring.
  • micro-wells may be used as part of a micro bioreactor. For example, a six-well slide described above may be used (or 12-well, 24-well, etc. sizes). The multi-well plate may eliminate the problems and waste associated with performing cell growth optimization in individual 500 mL or 1000 mL flasks.
  • the micro-bioreactor may also be configured to allow imaging of cells from any of the micro-bioreactor wells.
  • the bottom oft eh wells may be configured of 175 ⁇ m-thick glass, and the cover of the well may also be configured of glass or a sufficiently transparent material to allow illumination and imaging of the cells without having to remove a cell sample (as is required when growing cells in flasks).
  • the micro-bioreactor may be used with an inverted or upright microscope, as previously described.
  • the temperature of the plates may be regulated.
  • the wells (individually or as a group) of a plate may be temperature-controlled to within 0.1 0 C across the wells at user-defined temperatures.
  • the tops (or covers) of the wells may also be regulated. Regulation of the tops of the wells may also help prevent condensation on the top, enhancing imaging an signal detection through the plates. This temperature regulation may eliminate the need for incubators and heating mantles, as is required with flasks.
  • Each well of a multi-bioreactor typically includes fluidic channels that allow introduction of media at user-defined frequencies, volumes, rates (e.g., ⁇ L/min), etc.
  • Cells may remain in the wells (e.g., when adherent), or may be prevented from leaving by filtration, etc.
  • Small media volumes e.g., between 1 - 3 ml per well
  • the wells may also be calibrated to indicate approximate volume.
  • each well a multi-bioreactor may also include in/out lines for the introduction of pre-mixed gasses at user defined rates and frequencies. For example, up to three different gasses (e.g., N 2 , O 2 , CO 2 ) can be mixed at user-defined ratios, and applied to the mini-bioreactor.
  • One or more of the inlet lines into the wells of the micro-bioreactor may be configured to introduce media adjustments (e.g., buffers) into the well or wells.
  • media adjustments e.g., buffers
  • dilute sodium hydroxide may be added to adjust pH.
  • Media adjustment may be user determined as to rate of flow, frequency, etc.
  • the media adjustment may be automatically regulated.
  • the rate of flow and frequency of adjustment may be determined based on feedback control (e.g., from the controller).
  • a plate configured as a mini-bioreactor may also be disposable, or configured for single-use.
  • the mini-bioreactor may be used for a predetermined time period (e.g., hours, days, weeks, months) before being disposed (or recycled).
  • the micro- bioreactor may be reused (e.g., by sterilizing it, and/or reconditioning it).
  • a micro-bioreactor may also include individual well mixing, as described above.
  • Each well may contain magnetic mixers (e.g., the magnetic mixing beads). This magnetic mixing may allow the user to select mixing speed and frequency (or it may be automatically selected), eliminating the need for rockers or separate mixers. Mixing can be halted on demand, (e.g., when imaging).
  • magnetic mixers e.g., the magnetic mixing beads. This magnetic mixing may allow the user to select mixing speed and frequency (or it may be automatically selected), eliminating the need for rockers or separate mixers. Mixing can be halted on demand, (e.g., when imaging).
  • the micro-bioreactor may also include a cell counter.
  • the micro-bioreactor may include one or more integrated counters (or portions of a counter, as described above), or it may include a window region to allow cell counting by an external cell counter.
  • the micro-bioreactor may be adapted to connect to a cell counter that scans each well of the micro- bioreactor (e.g., multi-well plate) or that simultaneously counts cells from all (or a subset) of wells of the micro-bioreactor(s). Cell counting may be performed in real time. Each well may be monitored for cell growth using (for example) the turbometric cell counter described above. Cell counting may be preformed without contacting (e.g., without removing a sample of) the bioreactor. Cell counting may be automated. For example, the controller may automatically (at a user defined interval) count the number of cells.
  • Micro-bioreactors may also be monitored and regulated based on any appropriate sensors, including those described above.
  • a pH sensor may monitor the pH in each well.
  • a pH sensor is a non-contact fluorescent patch sensor for pH.
  • the gas concentration may also be monitored, including the pCO 2 and p ⁇ 2 .
  • Non-contact pCO 2 and p ⁇ 2 florescent patch sensors may be used, for example. Readings from any of these sensors may be used to modify the bioreactor environment.
  • the pCO 2 and p ⁇ 2 levels may be feed back to regulate the applied gas mixture (e.g., the % CO 2 /O 2 /N 2 mixture).
  • the pH sensor may feed back to regulate the pH of the chamber by adding acid/base mixtures or otherwise modifying the pH of the system.
  • one or more sensors may be included for monitoring the expression of a product, particularly products that are released into the media by the cells growing in the micro- bioreactor.
  • the product monitor may be a patch immunoassay detector, as described above.
  • the micro-bioreactor may be controlled by one or more controllers that can regulate and coordinate the activity of the sensors and active control features (e.g., temperature, stirring, media adjustment, etc.).
  • a controller may include controlling logic for controlling individually features (e.g., temperature, sensors, stirrers, etc.), or for coordinating multiple features.
  • the controller may include logic configured to receive sensor information on pH, cell count, gas concentrations (pCC> 2 , p ⁇ 2 , etc.), product concentration, temperature, and the like, and for using this information to adjust the environment of the micro-bioreactor (e.g., temperature, media adjustments, gas mixture added, sample extraction, etc.
  • the controller may also include user inputs, and may provide output.
  • Output from the controller may be sent to a display (e.g., LED, monitor, printer, etc.), an alarm (e.g., a bell, chime, light, etc.), a memory (e.g., digital memory, memory media, etc.), or an addition computer system.
  • a display e.g., LED, monitor, printer, etc.
  • an alarm e.g., a bell, chime, light, etc.
  • a memory e.g., digital memory, memory media, etc.
  • the controller and the controller logic may include both software and hardware.
  • the controller logic includes feed-back control.
  • the logic may include feedback control thorough decision trees and algorithms which may regulate the frequency, and manner in which the micro-bioreactor is monitored and adjusted. For example, the controller may automatically select and adjust individual wells.
  • the controller may assist or automatically control cell imaging (e.g., taking, storing, and analyzing images of cells at certain locates in the well, at certain frequencies, etc.).
  • the controller may regulate the temperature (both lid and the base of the plate or wells), as well as the media control (e.g., adding new media).
  • the controller may also sample the gas, and adjust the gas exchange and mixtures (ratios) based on pre-set values, or based on sensor output.
  • the media may be adjusted (e.g., pH may be adjusted by addition of NaOH, etc.), at predetermined or automatically determined intervals.
  • the cells and media may be mixed (stirred) continuously or at some preset or automatically determined intervals (e.g., using the magnetic stirrers described herein).
  • the cells within a well may be counted at set or automatically determined intervals.
  • p ⁇ 2 and pCO 2 may be sampled using the sensors at manually determined time points, or it may be automatically sampled (or both).
  • the controller(s) may continuously monitor and integrate any or all of these parameters.
  • the micro-bioreactor may be used for any appropriate types of cells, particularly for adherent and non-adherent mammalian cells, bacteria, and yeast.
  • the micro- bioreactor may also be used to optimize processes such as cell growth and production of a desired product.
  • they micro-bioreactor may be used to optimize conditions for growth and/or product production before scaling up (e.g., to 1000 L or more) production. This may be particularly useful in pharmaceutical (e.g., therapeutic antibody, etc.) production, or the production of other biologies or therapeutics.
  • cells or cell lines e.g., standard cultures of difficult to grow cells, such as stem cells, non-transfected animal cells, etc.).
  • Micro-bioreactors may also be useful in any process in which micro scale-up of a series of experiments or conditions is required for optimizing large-scale manufacturing.
  • micro-bioreactors may be useful in waste bioremediation studies for environmental clean-up and toxic waste abatement programs.
  • the micro-bioreactors described herein may be multi-well systems including small volume ("micro") wells in a single plate (e.., 6-well plate, etc.). The volume may be less than 1-3 ml/well on a single plate, which may have a single ABS format.
  • Each well may be a fully integrated bioreactor, including biosensors for pH, pCO 2 , p ⁇ 2 , product formation, temperature, etc. Further, the cells may be non-invasively counted and imaged, and media flow into and out of each well may be individually controlled.
  • Example 5 Sensor Arrangement
  • each well may incorporate multiple non-invasive sensors (or combinations of sensors), the sensors may be arranged so that they do not interfere with each other.
  • the sensors may be arranged to avoid cross-talk (e.g., between different fluorescent sensors), or optical interference with other sensors or with cell counting or cell imaging.
  • FIG. 1 1 shows one potentially advantageous arrangement of sensors, in which sensors for dissolved CO 2 , dissolved O 2 , pH, and product are arranged as concentrically around the perimeter of the well.
  • the well is also shown as being surrounded by a multi-pole electromagnet that may be used in stirring the well.
  • a multimode fiber bundle with concentrically arranged fibers may be used with the dissolved O 2 (DO) sensor, dissolved CO2 (dCO2), ph sensor, and product-specific sensor (antibody-coated optical sensor).
  • DO dissolved O 2
  • dCO2 dissolved CO2
  • ph ph
  • product-specific sensor antibody-coated optical sensor
  • the concentrically arranged sensor patches permit attachment to the detectors/sensor telemetry (e.g., a fiber-optic cable bundle) without requiring alignment of the cable bundle.
  • the outer diameter of the cable bundle matches the outer diameter of the attachment to the well (e.g., the bottom of the well) for monitoring the sensors.
  • the center of the concentric sensor rings is left open, permitting unobstructed viewing (e.g., imaging) or cell counting.
  • a fiber-optic based turbidity-type cell counter may be used y centrally aligning an optical detector on top of each well, as shown in FIG. 11.
  • optical signals may be simultaneously measured at user-specified (or automatic) intervals.
  • the sensors may simultaneously (or separately) measure any of: the level of product formation (or rate of product formation), cell counts, pH, DO, dCO 2 , mixing rate, temperature, etc.
  • FIG. 11 shows only a handful of sensors, additional sensors (or fewer sensors) may be used.
  • Example 6 SBS-compliant multi-well live cell imaging plates with built-in continuous gas/nutrient exchange and temperature control capability for high content screening (“HCS”)
  • HCS high content screening
  • a cell imaging plate according to the invention conforms to standards developed by the Society for Biomolecular Screening (SBS) specification of 96, 384, or 1536 wells per plate footprint.
  • Figure 19A shows a typical SBS-compliant plate according to the invention with 96 wells. It can be easily adapted to plates with 384 or 1536 wells.
  • FIG 19A shows a plan view of a bottom plate 1900 where each well 1903 is shaped to accommodate insertable nutrient tubes 1901 shown in green at the tope left of each well and waste removal tube 1902 shown in red at the bottom right of each well.
  • each plate has Indium Tin Oxide (ITO)-coated 175 micron thin optically clear glass 1930 shown in yellow or heater element 1940 shown in orange in closed loop temperature sensor.
  • ITO Indium Tin Oxide
  • Figure 19B shows a top view of the system. Above the bottom plate, a removable nutrient feed manifold 1910 with 96 individual well feed lines 1912 attached to the bottoms of the manifold 1910 and extending 0.5mm above the bottom of the well 1903.
  • the nutrient feed manifold 1910 is aligned with the wells 1903 and the well feed lines 1912 are aligned with the nutrient inlets of the wells 1901.
  • the nutrient feed manifold 1910 can be connected to single inlet 1914 via a pump to nutrient feed bottle (not shown). Based on Pascal's principle (Pascal's principle : Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container) flow of nutrient is uniform to all wells 1903.
  • Pascal's principle Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container
  • the nutrient feed manifold 1920 is aligned with the wells 1903 and the waste removal lines 1922 are aligned with the waste outlets of the wells 1902.
  • the waste removal line 1922 extends into the well up to a point that is slightly elevated from nutrient feed line 1912 such that a level of nutrient is maintained within the wells. the waste removal is operated at a higher flow rate than nutrient input rate to avoid overflow.
  • Waste manifold 1920 is connected to single outlet line 1924 via a pump to a waste bottle (not shown). Based on Pascal's principle removal of fluid will also be uniform in all wells 1903.
  • Drugs, growth factors, etc. can be added to any well 1903 using standard dispensers & pipettes.
  • gas CO 2 , O 2
  • ITO Indium Tin Oxide
  • Each lid comprises Indium Tin Oxide (ITO)-coated 175 micron thin optically clear glass 1930 shown in yellow or heater element 1940 shown in orange in closed loop temperature sensor.
  • a single chamber lysimeter (Model SW-071) from Soil Measurement Systems (Tuscon, Arizona, USA) is recommended for sampling down to 10 ft (3 m).
  • a constant vacuum is applied to the lysimeter through the vacuum/pressure line, while keeping the fluid return line closed.
  • the optimal vacuum is about 300 mbar.
  • Vacuum can be supplied with the battery powered vacuum pump Model SW-073 from Soil Measurement Systems (Tuscon, Arizona, USA).
  • the partial vacuum in the lysimeter draws pore water into the lysimeter through the porous stainless steel walls of the upper part of the lysimeter.
  • the fluid is brought to the surface by applying positive pressure to the vacuum/pressure line and opening the fluid return line.
  • the applied pressure forces the fluid up to the surface and into a collection bottle.
  • Sampling duration depends on the amount of sample required, the soil type, and the soil moisture content. Sampling times can vary from less than 1 hour in wet soil, to more than 1 day in drier soil.
  • Dual chamber lysimeters (Models SW-070 and SW-070A) from Soil Measurement Systems (Tuscon, Arizona, USA) is recommended for sampling unsaturated or saturated materials at depths greater thanlO feet (3 m).
  • Vacuum can be supplied with the battery powered vacuum pump from Soil Measurement Systems (Model SW- 073).
  • the partial vacuum in the lysimeter draws pore water into the lower chamber of the lysimeter through its porous stainless steel walls. From there it is drawn into the upper chamber where it is stored.
  • the fluid is brought to the surface by applying positive pressure to the vacuum/pressure line and opening the fluid return line, forcing the fluid up to the surface and into a collection bottle.
  • a stainless steel check valve prevents back flow of the fluid from the upper chamber into the lower chamber and the soil around the lysimeter.
  • Sampling duration depends on the amount of sample required, the soil type, and the soil moisture content. Sampling times can vary from less than 1 hour in wet soil, to more than 1 day in drier soil.

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Abstract

L'invention concerne des dispositifs de culture de tissus isolés environnementalement qui peuvent être utilisés pour la culture de cellule. Un dispositif de culture de tissus est décrit, qui comporte : une plaque multipuits présentant une pluralité de puits, chaque puits étant mis en forme pour loger au moins deux tubes insérables; une première tubulure d'alimentation en substances nutritives comprenant une pluralité de lignes d'alimentation de puits individuelles, ladite première tubulure étant positionnée au-dessus des puits et alignée de telle sorte que chaque ligne d'alimentation de puits s'étend vers une position adjacente à un fond d'un puits; une seconde tubulure d'alimentation de déchets comprenant une pluralité de lignes d'élimination de déchets individuelles, ladite seconde tubulure étant positionnée au-dessus des puits et alignée de telle sorte que chaque ligne d'élimination de déchets s'étend vers une position adjacente au premier puits, la ligne d'alimentation s'étendant vers un point légèrement élevé de l'alimentation de puits; une première admission dans la première tubulure pour fournir des substances nutritives; et une seconde admission dans la seconde tubulure pour éliminer les déchets. De plus, la culture de tissus peut comporter un microchauffage comprenant un revêtement électriquement conducteur et optiquement transparent situé sur la base optiquement transparente. Un couvercle à régulation de température pourvu d'admissions permettant la diffusion de gaz est également proposé.
PCT/US2008/004144 2007-03-27 2008-03-28 Plaque de perfusion de substance nutritive avec chauffage et échange de gaz pour criblage de contenu élevé WO2008118500A1 (fr)

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EP2980200A4 (fr) * 2013-03-25 2016-11-30 Hitachi Ltd Dispositif de culture de cellules, cuve de culture, et cuve de maintien
JP2017079633A (ja) * 2015-10-27 2017-05-18 高砂電気工業株式会社 自動灌流培養装置
US9738868B2 (en) 2011-07-19 2017-08-22 National Research Council Of Canada Photobioreactor
WO2018115161A1 (fr) * 2016-12-21 2018-06-28 F. Hoffmann-La Roche Ag Régulation de la croissance de cellules eucaryotes
US10738272B2 (en) 2016-06-27 2020-08-11 General Electric Company Heating assembly for a bioreactor and an associated method thereof
CN111930104A (zh) * 2020-08-18 2020-11-13 云南电网有限责任公司德宏供电局 基于油槽的便携式温控器校验系统
US11345880B2 (en) 2017-07-14 2022-05-31 Corning Incorporated 3D cell culture vessels for manual or automatic media exchange
CN114814157A (zh) * 2022-06-24 2022-07-29 中国煤炭地质总局勘查研究总院 一种煤层气生物富集实验系统
US11441121B2 (en) 2013-04-30 2022-09-13 Corning Incorporated Spheroid cell culture article and methods thereof
US11584906B2 (en) 2017-07-14 2023-02-21 Corning Incorporated Cell culture vessel for 3D culture and methods of culturing 3D cells
US11613722B2 (en) 2014-10-29 2023-03-28 Corning Incorporated Perfusion bioreactor platform
US11661574B2 (en) 2018-07-13 2023-05-30 Corning Incorporated Fluidic devices including microplates with interconnected wells
US11732227B2 (en) 2018-07-13 2023-08-22 Corning Incorporated Cell culture vessels with stabilizer devices
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US11912968B2 (en) 2018-07-13 2024-02-27 Corning Incorporated Microcavity dishes with sidewall including liquid medium delivery surface
US11976263B2 (en) 2014-10-29 2024-05-07 Corning Incorporated Cell culture insert

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9738868B2 (en) 2011-07-19 2017-08-22 National Research Council Of Canada Photobioreactor
EP2980200A4 (fr) * 2013-03-25 2016-11-30 Hitachi Ltd Dispositif de culture de cellules, cuve de culture, et cuve de maintien
US11441121B2 (en) 2013-04-30 2022-09-13 Corning Incorporated Spheroid cell culture article and methods thereof
US11613722B2 (en) 2014-10-29 2023-03-28 Corning Incorporated Perfusion bioreactor platform
US11976263B2 (en) 2014-10-29 2024-05-07 Corning Incorporated Cell culture insert
US11667874B2 (en) 2014-10-29 2023-06-06 Corning Incorporated Perfusion bioreactor platform
JP2017079633A (ja) * 2015-10-27 2017-05-18 高砂電気工業株式会社 自動灌流培養装置
US10738272B2 (en) 2016-06-27 2020-08-11 General Electric Company Heating assembly for a bioreactor and an associated method thereof
WO2018115161A1 (fr) * 2016-12-21 2018-06-28 F. Hoffmann-La Roche Ag Régulation de la croissance de cellules eucaryotes
US11767499B2 (en) 2017-07-14 2023-09-26 Corning Incorporated Cell culture vessel
US11584906B2 (en) 2017-07-14 2023-02-21 Corning Incorporated Cell culture vessel for 3D culture and methods of culturing 3D cells
US11345880B2 (en) 2017-07-14 2022-05-31 Corning Incorporated 3D cell culture vessels for manual or automatic media exchange
US11857970B2 (en) 2017-07-14 2024-01-02 Corning Incorporated Cell culture vessel
US11970682B2 (en) 2017-07-14 2024-04-30 Corning Incorporated 3D cell culture vessels for manual or automatic media exchange
US11661574B2 (en) 2018-07-13 2023-05-30 Corning Incorporated Fluidic devices including microplates with interconnected wells
US11732227B2 (en) 2018-07-13 2023-08-22 Corning Incorporated Cell culture vessels with stabilizer devices
US11912968B2 (en) 2018-07-13 2024-02-27 Corning Incorporated Microcavity dishes with sidewall including liquid medium delivery surface
CN111930104B (zh) * 2020-08-18 2023-02-03 云南电网有限责任公司德宏供电局 基于油槽的便携式温控器校验系统
CN111930104A (zh) * 2020-08-18 2020-11-13 云南电网有限责任公司德宏供电局 基于油槽的便携式温控器校验系统
CN114814157A (zh) * 2022-06-24 2022-07-29 中国煤炭地质总局勘查研究总院 一种煤层气生物富集实验系统

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