WO2006078036A1 - 生化学検査装置および生化学検査方法 - Google Patents
生化学検査装置および生化学検査方法 Download PDFInfo
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- WO2006078036A1 WO2006078036A1 PCT/JP2006/301050 JP2006301050W WO2006078036A1 WO 2006078036 A1 WO2006078036 A1 WO 2006078036A1 JP 2006301050 W JP2006301050 W JP 2006301050W WO 2006078036 A1 WO2006078036 A1 WO 2006078036A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6452—Individual samples arranged in a regular 2D-array, e.g. multiwell plates
Definitions
- the present invention relates to an apparatus and method for analyzing a biochemical reaction.
- Japanese Patent Laid-Open No. 2002-350446 discloses a biochemical test that can simultaneously detect the light intensity corresponding to each probe array element with a practically large dynamic range using an area sensor or line sensor having a normal dynamic range.
- a method is disclosed in which the desired ND filter is arranged on the observation optical path by switching the SND filter by the examiner.
- many ND filters must be repeatedly inserted and removed in order for the inspector to switch ND filters and cause the array detector to capture fluorescent images of all probe array elements. For this reason, it takes a long time to obtain a fluorescence image of the array for biochemical examination, and the working efficiency is remarkably poor.
- Japanese Laid-Open Patent Publication No. 2002-35446 relates to a method for determining the maximum accumulation time of a CCD, and the amount of received light corresponding to the minimum emission intensity of the array element region in the array for biochemical examination is linear with the output characteristics of the array detector.
- a method is disclosed in which the maximum value of the accumulation time is determined based on the condition that it exists in the region.
- the above conditions must be met. It takes a lot of storage time (for example, 300 seconds), and even if the inspector is forced to bear the burden, even after waiting for 300 seconds, the desired fluorescent image cannot be obtained. .
- the present invention has been made in consideration of such actual situations, and an object of the present invention is to provide an apparatus and method for efficiently acquiring an image having an optimum intensity for image analysis of a biochemical test array. It is to provide.
- the present invention is directed to a biochemical test apparatus for analyzing a biochemical reaction by measuring fluorescence emitted from a biochemical test array.
- the biochemical examination apparatus of the present invention includes an illumination means for irradiating the biochemical examination array with excitation light, an imaging means for taking a light image emitted from the biochemical examination array, and the photographed light. Recording means for storing the image, and the photographing means repeatedly shoots the light image while gradually increasing the initial value of the exposure time specified by the first meter, and captures the photographed light image.
- the present invention is directed to a biochemical test method for analyzing a biochemical reaction by measuring fluorescence emitted from a biochemical test array.
- the array for biochemical examination is irradiated with excitation light, the light image emitted from the array for biochemical examination in response to the excitation light irradiation, and the exposure time as the first parameter. If the maximum intensity in all pixels of the captured light image exceeds the intensity specified by the second parameter during repeated shooting, the initial value specified in the above The optical image recording is started, and the optical image recording is ended when the minimum intensity in the pixels in the area smaller than the entire area of the photographed optical image is larger than the intensity specified by the third parameter.
- FIG. 1 shows a configuration of a biochemical test apparatus according to an embodiment of the present invention.
- FIG. 2 is a plan view of a biochemical test array to be inspected by the biochemical test apparatus shown in FIG.
- FIG. 3 is a cross-sectional view of the array elements of the biochemical test array shown in FIG.
- FIG. 4 shows a part of an initial data file read into a control program operating on the computer shown in FIG.
- FIG. 5A shows an image taken immediately after the start of photographing.
- FIG. 5B shows the image immediately after the maximum intensity value of all pixels of the image is equal to or higher than TransStart.
- FIG. 5C shows an image taken with a longer exposure time after the image shown in FIG. 5B.
- FIG. 5D shows an image taken with a longer exposure time after the image shown in FIG. 5C.
- FIG. 5E shows an image taken with a longer exposure time after the image shown in FIG. 5D.
- FIG. 5F shows an area where the minimum intensity value compared with TransEnd is smaller than the entire area of the fluorescence image to be examined.
- FIG. 6 shows a state in which uneven illumination intensity occurs from the center to the outer periphery.
- FIG. 7 shows a flowchart of the operation of the biochemical test apparatus shown in FIG.
- FIG. 8A shows a fluorescence image of the array 100 for biochemical examination taken with an exposure time of 400 ms.
- FIG. 8B shows a fluorescence image of the array 100 for biochemical examination taken with an exposure time of 800 ms.
- FIG. 8C shows a fluorescence image of the biochemical test array 100 taken with an exposure time of 1600 ms.
- FIG. 8D shows a hybrid image formed based on the images of FIG. 8A, FIG. 8B, and FIG. 8C.
- FIG. 1 shows a configuration of a biochemical test apparatus according to an embodiment of the present invention.
- the excitation light source 204 is various lamps such as a mercury light source and LEDs, and is connected to the power supply unit 206.
- a shutter unit 208 incorporating a shirt plate 208a, a lens 210, a filter unit 212 incorporating two excitation filters 212a, and a dichroic mirror 214 Is placed.
- a stage 202 on which an objective lens 216 and a biochemical test array 100 are placed is disposed.
- an imaging lens 218 and a CCD camera 220 as an image sensor are disposed on the transmission optical path of the dichroic mirror 214.
- the CCD camera 220 includes a buffer memory (not shown) that can temporarily store at least one shot image and a signal processor (not shown) that can perform image operations such as signal intensity detection on the image in the buffer memory.
- the shutter unit 208 and the filter unit 212 can be controlled by a computer 224 via a universal control box 222.
- the stage 202 can be electrically positioned in the X and Y directions and can be controlled by the computer 224 via the stage controller 232.
- a keyboard 226, a monitor 228, and a mouse 230 are connected to the computer 224.
- the biochemical test apparatus 200 is directed to a stage 202 on which the biochemical test array 100 is mounted, an excitation light source 204 that emits excitation light, and the excitation light directed to the biochemical test array 100.
- Dichroic mirror 214 that reflects and transmits fluorescence from biochemical test array 100
- a CCD camera for taking fluorescent images of biochemical test array 100 And 220.
- the fluorescent image is a kind of optical image.
- An optical image is an image using various lights such as fluorescence, phosphorescence, chemiluminescence, bioluminescence, scattered light, and reflected light as signals.
- the biochemical examination apparatus 200 further includes a shutter unit 208 for appropriately blocking excitation light, a lens 210, and a filter unit 212 for selecting the wavelength of excitation light.
- the shutter unit 208, the lens 210, and the filter unit 212 are arranged in order on the optical path up to the dichroic mirror 214 with the excitation light source 204 force.
- the biochemical inspection apparatus 200 includes an objective lens 216 positioned between the dichroic mirror 214 and the stage 202, and an imaging lens 218 positioned between the dichroic mirror 214 and the CCD camera 220. Yes.
- the excitation light source 204, the shutter unit 208, the lens 210, the filter unit 212, the dichroic mirror 214, and the objective lens 216 are excited to the biochemical examination array 100.
- the illumination means for irradiating light is comprised.
- the object lens 216, the imaging lens 218, and the CCD camera 220 constitute an imaging unit for taking an optical image emitted from the biochemical examination array 100.
- the biochemical examination apparatus 200 includes a power supply unit 206 for driving the excitation light source 204, a stage controller 232 for driving the stage 202, a universal for driving the shutter unit 208 and the filter unit 212. Control box 222 and
- the biochemical examination apparatus 200 includes a computer 224 that controls a CCD camera 220, a stage controller 232, and a universal control box 222.
- a keyboard 226, a monitor 228, and a mouse 230 are connected to the computer 224 as a user interface.
- the computer 224 has a built-in hard disk and constitutes a recording means for storing the captured optical image.
- FIG. 2 and FIG. 3 show a biochemical test array to be tested by the biochemical test apparatus shown in FIG.
- the biochemical test array 100 is a three-dimensional array, and as shown in FIG. 2, a porous three-dimensional substrate 102 and a number of probe array elements (probe spots) 106 formed on the three-dimensional substrate 102. And have.
- Probe array element 106 is a three-dimensional It is arranged two-dimensionally on the material 102, and position detection array elements (position detection spots) 104 are formed at the four corners of the array region of the probe array elements 106.
- the three-dimensional substrate 102 has a large number of through-holes. As shown in FIG.
- a probe 110 that reacts with a specific substance is immobilized on the inner wall of the through-hole 108 located in the probe array element 106. It has been converted.
- the probe array element (probe spot) 106 is formed, for example, by dispensing a required amount of a solution containing a probe onto the three-dimensional substrate 102.
- the plurality of probe array elements 106 on the three-dimensional substrate 102 include a plurality of types.
- Each probe array element 106 includes the same type of probe 110, and when the probe 110 reacts with a specific substance, it emits specific fluorescence in response to irradiation with specific excitation light.
- the biochemical examination apparatus 200 is controlled by a control program that operates on the computer 224.
- the computer 224 includes a control program for controlling the entire biochemical test apparatus 200.
- This control program controls the entire biochemical test apparatus 200 by reading the operation of the initial data file force control program itself as shown in FIG. 4 and the operation parameters of each unit.
- FIG. 4 shows a part of the initial data file.
- the inspector or device administrator can easily modify and change the initial data file using a general editor. That is, the inspector or device administrator can easily modify and change the initial data file by operating the keyboard 226 and operating the mouse 230 if necessary while viewing the monitor 228.
- the initial data file includes various parameters, and the monitor 228, keyboard 226, and mouse 230 constitute input means for enabling arbitrary setting of parameters in the initial data file.
- the parameter one shown in FIG. 4 is a photographing parameter when photographing a fluorescent image of the biochemical test array 100 with the CCD camera 220.
- ExpStart is an initial value of an exposure time (CCD charge accumulation time) when the CCD camera 220 takes a fluorescent image of the biochemical test array 100.
- the CCD camera 220 is shown here when the inspector instructs the biochemical test array 100 to start taking fluorescent images.
- the array for biochemical inspection while changing the exposure time so that it gradually becomes longer from the initial value.
- TransStart is a reference value of the pixel intensity value for the CCD camera 220 to determine the start (recording) of the fluorescent image. That is, the CCD camera 220 transfers the image data to the computer 224 when the intensity value of the brightest pixel among all the pixels of the captured fluorescent image of the biochemical test array 100 exceeds the Trans Start value. In response to this, the storage device (hard disk in the computer 224) starts recording (storing) image data.
- TransEnd is a reference value of the pixel intensity value for the CCD camera 220 to determine the end of recording (saving) of the fluorescent image.
- the CCD camera 220 detects that the intensity value of the darkest pixel among the pixels in the region near the center that is smaller than the entire region of the fluorescent image of the captured biochemical test array 100 is larger than the TransEnd value.
- the storage device the hard disk in the computer 224) finishes recording (storing) the image data.
- TtansPicts is a reference value of the number of recorded (stored) sheets for the CCD camera 220 to determine the end of recording (saving) of the fluorescent image.
- the CCD camera 220 finishes transferring the image data to the computer 224 when the number of fluorescent images of the array for biochemical examination transferred to the computer 224 becomes larger than the value of TtansPicts, and stores it accordingly.
- the device hard disk in the computer 224) finishes recording (saving) the image data.
- MaxExpTime is a reference value of the exposure time for the CCD camera 220 to determine the end of recording (saving) of the fluorescent image. That is, the CCD camera 220 finishes transferring the image data to the computer 224 when the exposure time for capturing the fluorescent image of the biochemical test array 100 becomes longer than the MaxExpTime value, and in response to this, the storage device (The hard disk in the computer 224) finishes recording (saving) the image data.
- the examiner In preparation for biochemical examination, the examiner creates a solution containing two kinds of biochemical substances labeled with, for example, two-color fluorescent molecules (or chemiluminescent molecules). In this case, the inspector Make solutions of the two biochemicals you want to compare at the same concentration, label one with FITC and the other with rhodamine. These labeling substances may be other substances as long as they are a combination of substances having different fluorescence wavelengths. After that, the prepared two kinds of biochemical substance solutions are mixed at a volume ratio of 1: 1, and stirred to obtain a mixed solution of biochemical substances. The mixing ratio may be changed according to the properties of the two biochemical substances and the labeling substance.
- two-color fluorescent molecules or chemiluminescent molecules
- the inspector supplies the biochemical test array 100 with a mixed solution of biochemical substances and reacts specifically with the probe.
- the inspector places the biochemical test array 100 on the stage 202 under the observation by the biochemical test apparatus 200 shown in FIG. 1, and a mixed solution of biochemical substances on the surface thereof. Supply.
- This causes a specific binding reaction between the probe in the probe array element 106 on the biochemical test array 100 and the biochemical substance contained in the mixed solution.
- a quantity of fluorescent molecules (or chemiluminescent molecules) corresponding to the intensity of reaction in each probe array element 106 is indirectly bound to the probe.
- the inspector removes unreacted biochemical substances from the biochemical test array 100.
- the examiner removes unbound biochemical substances from each probe array element 106 of the biochemical test array 100 after the above-described binding reaction.
- a cleaning method using a cleaning solution is employed.
- the solution may be removed by a pump or the like without using the cleaning solution.
- it goes without saying that using a cleaning solution will definitely remove it!
- the examiner operates the computer 224 through the monitor 228 in order to take a fluorescent image of the biochemical test array 100 for each labeling substance with the CCD camera 220.
- the computer 224 sends a command to the universal control box 222, and the two excitations built into the filter unit 212.
- the filter 212a By switching the filter 212a, an excitation filter corresponding to the desired fluorescent molecule color is arranged on the illumination optical path.
- the computer 224 transmits a command for opening the shutter plate 208a incorporated in the shutter unit 208 in the universal control box 222.
- the excitation light source 20 The excitation light from 4 passes through the lens 210 and the excitation filter 212a, is reflected by the dichroic mirror 214, and irradiates the entire upper surface of the biochemical test array 100 via the objective lens 216.
- the fluorescence generated by the fluorescent molecules in each probe array element 106 passes through the objective lens 216, the dichroic mirror 214, and the imaging lens 218 and is applied to the CCD camera 220.
- the CCD camera 220 repeatedly shoots while gradually increasing the initial value force indicated by ExpStart written in the initial data file for the exposure time (accumulation time).
- ExpStart is 10 ms
- the CCD camera 220 does not transfer image data to the computer 224 while the maximum intensity value of all pixels of the image is smaller than TransStart! /.
- FIG. 5A shows an image taken immediately after the start of shooting. That is, it shows an image taken with an exposure time of 10 ms. In the image of Figure 5A, the maximum intensity value for all pixels is less than TransStart. Therefore, the CCD camera 220 does not transfer the image data in FIG. 5A to the computer 224.
- the CCD 220 Mera 220 repeats the same operation until the maximum intensity value of all pixels in the image is greater than or equal to TransStart.
- the CCD camera 220 starts transferring image data to the computer 224 when the maximum intensity value of all pixels of the image is equal to or higher than TransStart.
- Figure 5B shows the image immediately after the maximum intensity value of all pixels in the image is greater than or equal to TransStart. In the image of Figure 5B, the maximum intensity value of all pixels in the image is greater than or equal to TransStart, and two probe array elements appear. Therefore, the CCD camera 220 transfers the image data in FIG. 5B to the computer 224. The transferred image data is recorded (saved) on the hard disk in the computer 224.
- the CCD camera 220 continues to transfer image data to the computer 224 while the minimum intensity value in the region near the center that is smaller than the entire region of the fluorescent image is equal to or less than TransEnd. As the exposure time increases, the fluorescence image of the biochemical test array 100 is shown in sequence in Figure 5. As shown in C, Fig. 5D, and Fig. 5E, more and more probe array elements appear.
- the CCD camera 220 ends the transfer of the image data to the computer 224 when the minimum intensity value in the area smaller than the entire area of the fluorescent image becomes larger than Trans End. Thereby, the recording (storing) of the image data to the hard disk in the computer 224 is completed.
- the CCD camera does not need a signal processor for image calculation.
- the computer 224 calculates a correction coefficient for the illumination intensity unevenness distribution power of the biochemical test array 100, and the fluorescence of all the probe array elements is recorded for each exposure time for the already recorded (stored) image. Correct the emission intensity using the calculated correction factor. In other words, the computer 224 performs exposure on stored images during exposure.
- a correction means is configured to correct the fluorescence emission intensity of all the probe array elements at intervals with the correction coefficient calculated for the uneven distribution of illumination intensity.
- the fluorescence image of the biochemical test array 100 obtained at this time is, for example, an image as shown in FIG. 5E. However, since the probe array element emits fluorescence! / As it is, the image is filtered. The probe array elements are deleted by pixel interpolation, and a correction coefficient calculation image as shown in Fig. 6 is created. A correction coefficient is calculated from this correction coefficient calculation image.
- the fluorescent image of the biochemical test array 100 is taken without any problem by the series of operations described above. However, if the inspector has mistakenly mixed the biochemical substance solution, or if the probe array element has not been created correctly, the correct binding reaction will not occur in the biochemical test array 100. As a result, the probe array element may not emit fluorescence as expected. In that case, a considerably long time is required until the maximum intensity in the biochemical test array 100 becomes larger than the pixel intensity indicated by TransStart. In that case, the experiment itself is unsuccessful, and it is meaninglessly waited until the exposure time becomes considerably long.
- a message indicating that a desired image could not be shot at that time is displayed on the monitor 228. Display and finish shooting.
- FIG. 7 shows a flowchart of the series of operations described above. As shown in Fig. 7, the above series of operations can be summarized as follows. First, a fluorescent image of the biochemical test array 100 is taken at the ExpStart exposure time. If the maximum intensity value of all pixels of the fluorescent image is smaller than Trans Start, the exposure time is increased and the fluorescent image of the biochemical test array 100 is taken again.
- the exposure time is increased and the fluorescent image of the biochemical test array 100 is repeatedly captured until the maximum intensity value of all the pixels of the captured fluorescent image is equal to or greater than TransStart.
- the image data is transferred to the computer 224 and recorded (stored) on a hard disk in the computer 224, and the number of recorded images is counted. Thereafter, the increase in exposure time, shooting, image data transfer and recording, and counting of the number of recorded images are repeated.
- the imaging is terminated.
- the fluorescence image of the biochemical test array 100 acquired by imaging, transfer, and image processing as described above is divided for each probe array element by the computer 224 and stored as a divided image. At that time, the maximum intensity value of the probe array element region and the exposure time are added as data to each divided image. This is done for all exposure times, and finally a hybrid image is created. The hybrid image will be described with reference to FIG. 8A V and FIG. 8D.
- FIG. 8A, FIG. 8B, and FIG. 8C show fluorescence images of the biochemical test array 100 taken at exposure times of 400 ms, 800 ms, and 1600 ms, respectively.
- the fluorescence image of Fig. 8A no light can be seen on the screen where the intensity values of probe array elements A1 and A9 are as low as 200.
- the range of the intensity value from 00 to 3000 is set as the most linear and reliable range because of the relationship between the CCD and its peripheral circuits.
- the computer 224 finds the intensity value closest to 3000 below 3000 and its exposure time among a plurality of recorded (stored) images for each of the probe array elements. Specifically, in the images of FIGS. 8A, 8B, and 8C, intensity values are detected for each of the probe array elements, and multiple intensity values (for example, A1 and B1) of the same probe are detected. And CI intensity values), the data of the intensity value closest to 3000 and the exposure time data are extracted. When this operation is completed for all probe array elements, the intensity value is converted into an exposure time of, for example, 1 second (normalized) for all the probe array elements, and all the probe array elements after conversion are converted. The image shown in Fig. 8D is formed by combining the two images and displayed on the monitor 228 as a pseudo graphic image.
- the inspector inspects the degree of reaction of each probe array element based on the pseudo graphic image and the converted data of the intensity value.
- the fluorescent image of the biochemical examination array to be recorded (stored) is in the desired intensity range. This prevents useless images from being recorded (saved). Furthermore, by specifying the maximum exposure time and by specifying the number of fluorescent images to be acquired, useless time wasted is prevented. Therefore, an image of the biochemical test array having the optimum intensity for image analysis can be acquired efficiently.
- a fluorescent dye is used for labeling a biochemical substance and the array for biochemical examination is illuminated with a light source to obtain fluorescence as an optical image.
- Many fluorescent materials have various characteristics, and are preferred because they have a wide selection range depending on the application.
- various detection methods and labels can be applied to the present invention.
- chemiluminescence or bioluminescence no light source is needed to illuminate the biochemical test array.
- an enzyme is used for labeling a biochemical substance and detection is performed by the chemiluminescence method, light is emitted by the reaction between the enzyme and the substrate, so that a light source for illuminating the biochemical test array is not necessary.
- the universal control box 222, the filter unit 212, the lens 210, the shutter unit 208, the excitation light source 204, and the power supply unit 206 are not necessarily required.
- Various fluorescent substances can also be used as labels when detecting by fluorescence.
- fluorescent glass particles, fluorescent ceramics, and fluorescent proteins such as GFP can also be used.
- metal particles or dielectric particles are used as labels.
- fine particles of gold, silver, platinum, silicon, etc. Tas particles can be used.
- fine particles such as gold, silver and platinum having a particle size of 0.1 to 1 m are particularly preferable because the speed of particles in a moving state is optimized similarly.
- the optimum particle size is determined by the specific gravity of the particles and the speed of Brownian motion.
- examples of the moving state of the particles include Brownian motion and vibration.
- the present invention can be applied to the case where a biochemical substance is labeled and detected, in addition to the use of other labels in addition to the fluorescent dye.
- the process of ending the shooting may be omitted. Similarly, the process of ending the shooting may be omitted if the number of shots exceeds the number indicated by TransPicts during repeated shooting.
- the method of increasing the exposure time is not limited to this.
- the exposure time may be increased by a certain ratio (in a geometric progression) or by a certain increment (in an arithmetic progression).
- it may be increased according to a predetermined increase pattern without regularity between two consecutive exposure times.
- the preferred ratios to increase the exposure time are the camera characteristics (dynamic range (range where output linearity is good with respect to input), photoelectric conversion efficiency, saturation charge per pixel) Depends on signal minimum and maximum difference. In other words, it depends on the camera used and the object to be detected. For this reason, you can repeat the experiment several times and decide on the basis of the results.
- the rate of increase in exposure time is smaller! /, The amount of information to be acquired increases, but the time required for processing becomes longer. Therefore, the rate of increase in exposure time should be determined in consideration of the trade-off between the amount of information to be acquired and the time required for processing.
- the inspection conditions may be fed back to inspect while optimizing the rate of increase in exposure time. This is effective in reducing the processing time.
- an apparatus and a method for efficiently acquiring an image having an optimum intensity for image analysis of a biochemical test array are provided.
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EP06712266A EP1843146A1 (en) | 2005-01-24 | 2006-01-24 | Biochemical inspection device and biochemical inspection method |
JP2006554001A JP4724126B2 (ja) | 2005-01-24 | 2006-01-24 | 生化学検査装置および生化学検査方法 |
US11/880,657 US7920733B2 (en) | 2005-01-24 | 2007-07-23 | Biochemical examination apparatus and biochemical examination method |
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- 2006-01-24 WO PCT/JP2006/301050 patent/WO2006078036A1/ja active Application Filing
- 2006-01-24 KR KR1020087026572A patent/KR20080108145A/ko not_active Application Discontinuation
- 2006-01-24 JP JP2006554001A patent/JP4724126B2/ja active Active
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Also Published As
Publication number | Publication date |
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KR20070086878A (ko) | 2007-08-27 |
KR100877656B1 (ko) | 2009-01-08 |
US7920733B2 (en) | 2011-04-05 |
KR20080108145A (ko) | 2008-12-11 |
EP1843146A1 (en) | 2007-10-10 |
JPWO2006078036A1 (ja) | 2008-06-19 |
JP4724126B2 (ja) | 2011-07-13 |
US20080018778A1 (en) | 2008-01-24 |
CN101111757A (zh) | 2008-01-23 |
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