US20150337257A1 - Composition for preventing odors containing ordorless microorganism - Google Patents

Composition for preventing odors containing ordorless microorganism Download PDF

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Publication number
US20150337257A1
US20150337257A1 US14/653,977 US201314653977A US2015337257A1 US 20150337257 A1 US20150337257 A1 US 20150337257A1 US 201314653977 A US201314653977 A US 201314653977A US 2015337257 A1 US2015337257 A1 US 2015337257A1
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Prior art keywords
methylobacterium
hkmc
evaporator core
coating
composition
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US14/653,977
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Ji Wan Kim
Tae Hee Lee
So Yoon PARK
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Hyundai Motor Co
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Hyundai Motor Co
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Assigned to HYUNDAI MOTOR COMPANY reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, JI WAN, LEE, TAE HEE, PARK, So Yoon
Publication of US20150337257A1 publication Critical patent/US20150337257A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
    • A01N63/22—Bacillus
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
    • A01N63/27—Pseudomonas
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators

Definitions

  • the present invention relates to a composition for preventing odors containing odorless microorganisms or a culture thereof and a method for preventing odors using the same.
  • Clean air is recognized as an integral component in human health and well-being. Offensively smelling or polluted air severely spoils a pleasant environment. For example, unsatisfactory indoor air quality under an airtight condition is caused by two important factors. One is the air pollutants generated directly from the materials that constitute the airtight environment (e.g., building, vehicle, etc.) and the other is the odor generated by human activities or caused by external substances.
  • An air-conditioning system refers to a system designed to decrease indoor temperature and optimize the indoor environment in buildings, vehicles, trains, ships, airplanes, etc. for the purpose of conditioning the temperature, humidity, flow rate and cleanness of air.
  • the air-conditioning system has been increasing gradually.
  • there has been much improvement in the basic function of the air-conditioning system a lot of problems still remain to be solved in the environmental aspect for indoor air quality.
  • the cause of the odor of the air-conditioning system has been known to be the metabolites produced by molds and bacteria. However, it has not been specifically identified yet which molds and bacteria produce how much such metabolites.
  • EPS extracellular polymeric substances
  • EPS include various components such as proteins, polysaccharides, polyuronic acids, nucleic acids, lipids, etc.
  • mVOCs microbial volatile organic compounds
  • the inventors of the present invention have disclosed in Korean Patent Publication No. 10-2012-0020309 a method for manufacturing an evaporator core coated with a biofilm formed of specific microorganisms that are odorless or fragrant to prevent attachment and growing of bacteria and molds that cause offensive odor on the evaporator core.
  • the inventors of the present invention have made efforts to find a method for effectively controlling microorganisms causing offensive odor using odorless microorganisms. As a result, they have successfully screened 13 kinds of microorganisms which do not cause offensive odor in an air-conditioning system and have confirmed that, when a biofilm is formed using them or a combination of them, the growth of offensive odor-causing microorganisms can be prevented and thus offensive odor can be prevented.
  • the present invention is directed to providing a composition for preventing odors, which contains odorless microorganisms or a culture thereof.
  • the present invention is also directed to providing an evaporator core coated with the composition for preventing odors.
  • the present invention is also directed to providing a method for manufacturing an odorless evaporator core which does not cause odor in an air-conditioning system, which includes coating the composition for preventing odors on an evaporator core.
  • the present invention is also directed to providing a method for preventing odors from an air-conditioning system, which includes coating the composition for preventing odors on an evaporator core.
  • the present invention is also directed to providing a method for checking odors from an air-conditioning system, which includes coating the composition for preventing odors on an evaporator core.
  • the present invention is also directed to providing odorless microorganisms for coating an evaporator core for preventing odors from an air-conditioning system.
  • the present invention provides a composition for preventing odors, which contains odorless microorganisms or a culture thereof.
  • the inventors of the present invention have made efforts to find a method for effectively controlling microorganisms causing offensive odor using odorless microorganisms.
  • they have endeavored to fundamentally eradicate the cause of offensive odors from an air-conditioning system.
  • they have successfully screened 13 kinds of microorganisms which do not cause offensive odor in an air-conditioning system and have confirmed that, when a biofilm is formed using them or a combination of them, the growth of offensive odor-causing microorganisms can be prevented and thus offensive odor can be prevented.
  • the term “air-conditioning system” refers to a system which maintains temperature, humidity, cleanness, flow, etc. of air inside a space which is entirely or partially isolated from the external environment.
  • the isolated space may be an indoor space which is entirely or partially isolated from outside, such as inside a building, vehicle, train, ship, airplane, etc.
  • the air-conditioning system may be an air conditioner.
  • the biofilm is a group of living microorganisms enclosed in a membrane.
  • the membrane protects the microorganisms from external environment and supplies nutrients.
  • the membrane is composed of extracellular polymeric substances (EPS), which include various components such as proteins, polysaccharides, polyuronic acids, nucleic acids, lipids, etc.
  • EPS extracellular polymeric substances
  • the inventors of the present invention have screened microorganisms which do not cause offensive odor from the evaporator core and, through culturing, have isolated dominant strains that form colonies from the microorganisms.
  • the dominant strains may be isolated and cultured according to various methods known in the related art and the dominant microorganisms may be screened, for example, based on dilution ratios or morphological characteristics such as the color, size, shape, etc. of the colonies.
  • the dominant microorganisms include Methylobacterium, Acinetobacter, Bacillus, Brevibacillus, Deinococcus, Pseudomonas, Sphingomonas or Flavobacterium , specifically Methylobacterium aquaticum, Methylobacterium brachiatum, Methylobacterium platani, Acinetobacter johnsonii, Bacillus vietnamensis, Brevibacillus invocatus, Deinococcus ficus, Leifsonia soli, Pseudomonas nitroreducens, Sphingomonas aquatilis, Methylobacterium komagatae, Deinococcus apachensis or Flavobacterium oceanosedimentum.
  • Methylobacterium aquaticum HKMC-1 (Accession number: KCCM11325P), Methylobacterium brachiatum HKMC-2 (Accession number: KCCM11326P), Methylobacterium platani HKMC-3 (Accession number: KCCM11327P), Acinetobacter johnsonii HKMC-4 (Accession number: KCCM11328P), Bacillus vietnamensis HKMC-5 (Accession number: KCCM11329P), Brevibacillus invocatus HKMC-6 (Accession number: KCCM11330P), Deinococcus ficus HKMC-7 (Accession number: KCCM11331P), Leifsonia soli HKMC-8 (Accession number: KCCM11332P), Pseudomonas nitro
  • microorganisms may be contained in the composition for preventing odors either alone or in combination other microorganisms.
  • the composition for preventing odors of the present invention may be used to prevent the inhabitation of offensive odor-generating microorganisms and/or the offensive odors generated by them. That is to say, the composition of the present invention may be used to prevent the inhabitation of offensive odor-generating microorganisms by coating on or spraying to all or specific parts of offensive odor-generating apparatuses (e.g., air-conditioning system, waste water treatment unit, etc.), articles (e.g., waste basket, toilet bowl, etc.), animals (e.g., contaminated livestock, etc.) or human bodies (e.g., mouth, diabetic foot, etc.).
  • offensive odor-generating apparatuses e.g., air-conditioning system, waste water treatment unit, etc.
  • articles e.g., waste basket, toilet bowl, etc.
  • animals e.g., contaminated livestock, etc.
  • human bodies e.g., mouth, diabetic foot, etc.
  • the composition for preventing odors of the present invention may further contain various medium components known in the related art to enhance biofilm formation on the different objects.
  • the medium components may include, for example, agar, gelatin, alginate, carageenan or pectin.
  • PTYG medium, R2A medium or LB medium may be used for an evaporator core in an air-conditioning system.
  • composition for preventing odors of the present invention may further contain, in addition to the odorless microorganisms, an aromatic, a sterilizer, an antimicrobial agent, etc. to prevent offensive odors or to prevent or remove offensive odor-generating microorganisms.
  • the composition of the present invention is for preventing odors from an air-conditioning system.
  • the air-conditioning system to which the composition of the present invention is applicable may be installed in buildings, vehicles, trains, ships, airplanes, etc. for the purpose of conditioning the temperature, humidity, flow rate or cleanness of air.
  • the object on which the biofilm of the present invention is coated may be an air-conditioning system.
  • the air-conditioning system includes a compressor, a blower, an evaporator core, etc.
  • the object on which the biofilm of the present invention is coated may be an evaporator core.
  • an environment favorable for inhabitation and proliferation of microorganisms is created on the surface of the evaporator core in the air-conditioning system due to heat exchange of air.
  • the microorganisms adhering on the surface form a stable biofilm which is difficult to be removed. That is to say, the odorless microorganisms can be proliferated in advance such that the inhabitation of offensive odor-generating microorganisms can be prevented.
  • the inventors of the present invention have found out that a biofilm consisting only of odorless microorganisms which are dominant species or have superior viability can be formed on the evaporator core by coating them in advance on the evaporator core of the air-conditioning system and, thereby, offensive odors and the proliferation and inhabitation of other offensive odor-generating microorganisms can be significantly prevented (Examples 9-14).
  • the present invention provides an evaporator core coated with the composition for preventing odors and a method for manufacturing the same.
  • a fin of the evaporator core is made of aluminum or an aluminum alloy, and the evaporator core is manufactured using antibacterial-treated aluminum or a non-antibacterial-treated aluminum alloy.
  • the material of the evaporator core is not limited to the aluminum or the aluminum alloy.
  • the evaporator core may be manufactured from any metal having good thermal conductivity and excellent corrosion resistance, such as copper, in addition to the aluminum or an alloy thereof.
  • a heat exchanger may be coupled with a Peltier device. Like this, any material can be used as long as a structure allowing for easy heat exchange can be achieved.
  • the composition for preventing odors containing odorless microorganisms or a culture thereof may be coated on the evaporator core according to various methods known the related art (e.g., spraying, coating, immersion).
  • the evaporator core may be immersed in a culture of the odorless microorganisms such that the odorless microorganisms can be uniformly coated on the fin inside the evaporator core.
  • the coating may be carried out once or several times.
  • the culture of the odorless microorganisms may have an optical density (O.D.) of 0.3-0.9, more preferably 0.4-0.8.
  • the microorganisms When the microorganism culture having an O.D. value of 0.3-0.9 is used, the microorganisms may be coated at a concentration of 10 4 -10 8 CFU/g. And, when the microorganism culture having an O.D. value of 0.4-0.89 is used, the microorganisms may be coated at a concentration of 10 5 -10 7 CFU/g. Considering that the concentration of microorganisms present on the evaporator core in a used vehicle is about 10 6 CFU/g, the microorganisms may be preferably coated at a concentration of 10 5 -10 7 CFU/g using a microorganism culture having an O.D. value of 0.4-0.8.
  • the coated odorless microorganisms can form a biofilm which is stable for a long time (30 days or longer, 60 days or longer or 90 days or longer) by being uniformly distributed on and inhabiting the evaporator core surface (Examples 11-13).
  • the present invention provides a method for preventing odors from an air-conditioning system, including: coating the composition for preventing odors on an evaporator core.
  • the inventors of the present invention have conducted experiments after installing a jig on a vehicle roof and then mounting the evaporator core coated with the composition of the present invention thereon in order to investigate whether the evaporator core can maintain the population of odorless microorganisms under an outdoor air condition and prevent the inhabitation of other offensive odor-generating microorganisms. As a result, it was found that the initially coated population of the odorless microorganisms was maintained for 60 days and no exogenous microorganisms that may generate offensive odor were detected (Example 14).
  • the inflow and inhabitation of exogenous microorganisms that may generate offensive odors can be significantly prevented and, thus, the offensive odors from an air-conditioning system can be effectively prevented.
  • the present invention provides a method for checking odors from an air-conditioning system, including coating the composition for preventing odors on an evaporator core.
  • microorganisms contained in the composition for preventing odors actually generate odors may be dependent on the components of nutrition source which the microorganisms metabolize. Therefore, it is important that the microorganisms not generate odors when the nutrition sources in the related industrial fields are supplied.
  • microorganisms metabolize various substances floating in the air indoors and outdoors as nutrients. That is to say, indoor or outdoor air contaminants or exhaust gas components (petroleum fuels such as gasoline, diesel oil, LPG, etc.) are the nutrition sources of the microorganisms. Accordingly, it can be checked in advance whether odors will be generated from an air-conditioning system under the actual industrial setting by introducing these nutrition sources to the evaporator core coated with the microorganisms.
  • indoor or outdoor air contaminants or exhaust gas components (petroleum fuels such as gasoline, diesel oil, LPG, etc.) are the nutrition sources of the microorganisms. Accordingly, it can be checked in advance whether odors will be generated from an air-conditioning system under the actual industrial setting by introducing these nutrition sources to the evaporator core coated with the microorganisms.
  • the present invention provides Methylobacterium aquaticum HKMC-1 (Accession number: KCCM11325P), Methylobacterium brachiatum HKMC-2 (Accession number: KCCM11326P), Methylobacterium platani HKMC-3 (Accession number: KCCM11327P), Acinetobacter johnsonii HKMC-4 (Accession number: KCCM11328P), Bacillus vietnamensis HKMC-5 (Accession number: KCCM11329P), Brevibacillus invocatus HKMC-6 (Accession number: KCCM11330P), Deinococcus ficus HKMC-7 (Accession number: KCCM11331P), Leifsonia soli HKMC-8 (Accession number: KCCM11332P), Pseudomonas nitroreducens HKMC-9 (Accession number: KCCM11333P), Sphingomonas aquatilis
  • microorganisms may be used for coating an evaporator core to prevent odors from an air-conditioning system either alone or in combination.
  • the present invention provides a composition for preventing odors, which contains odorless microorganism or a culture thereof.
  • the present invention also provides an evaporator core which is coated with the composition for preventing odors and a method for manufacturing the same.
  • the present invention provides a method for preventing odors, which includes coating the composition for preventing odors on an evaporator core.
  • FIG. 1 shows a Petri dish in which a sterilized aluminum fin is dipped in a nutrient medium for inoculation with odorless microorganisms.
  • FIG. 2 shows the population of colonies of different colors for a combination 1 in survival evaluation for 30 days.
  • FIG. 3 shows the ratio of colonies of different colors for a combination 1 in survival evaluation for 30 days.
  • FIG. 4 shows the ratio of strains for a combination 1 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 5 shows the ratio of strains for a combination 2 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 6 shows the ratio of strains for a combination 3 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 7 shows the ratio of Methylobacterium sp. strains for a combination 3 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 8 shows the ratio of strains for a combination 4 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 9 shows the ratio of strains for a combination 5 in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 10 shows the ratio of strains for a combination A in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 11 shows the ratio of strains for a combination B in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 12 shows the ratio of strains for a combination C in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 13 shows the ratio of strains for a combination D in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 14 shows the ratio of strains for a combination E in survival evaluation for 30 days measured by REP-PCR.
  • FIG. 16 shows the population of a combination of Methylobacterium aquaticum and Methylobacterium komagatae in survival evaluation for 90 days.
  • FIG. 17 shows the ratio of strains for a combination of Methylobacterium aquaticum and Methylobacterium komagatae in survival evaluation for 90 days measured by REP-PCR.
  • FIG. 18 shows the population of a combination of Methylobacterium aquaticum and Methylobacterium komagatae on a jig.
  • FIG. 19 shows the change in the population of a combination of Methylobacterium aquaticum and Methylobacterium komagatae on a jig measured by REP-PCR.
  • Vehicle Sample type 1 Vehicle A Evaporator core 2 Vehicle B Evaporator core 3 Vehicle C Evaporator core 4 Vehicle D Evaporator core 5 Vehicle E Evaporator core
  • Evaporator core samples were taken from the evaporator cores mounted in 5 used vehicles (vehicles A-E) giving off offensive odors.
  • Microorganisms were detached from the evaporator cores as follows.
  • Microorganisms were physically detached from the evaporator cores of the vehicles A-E through the steps ⁇ circle around (1) ⁇ - ⁇ circle around (10) ⁇ .
  • Aerobic heterotrophic bacteria usually called normal bacteria were isolated from the air conditioner by culturing on a heterotrophic plate.
  • PTYG agar medium and R2A agar medium were used as complex nutrient media to isolate the normal bacteria.
  • the PTYG agar medium was prepared by adding 0.25 g of peptone (Difco), 0.25 g of triptone (Difco), 0.5 g of yeast extract (Difco), 0.5 g of glucose (Difco), 30 mg of MgSO 4 (Sigma), 3 mg of CaCl 2 (Sigma) and 15 g of Bacto agar (Difco) to 980 mL of distilled water and sterilizing at 121° C. for 15 minutes under high pressure after adjusting pH to 7.0.
  • the R2A agar medium was prepared by adding 0.5 g of yeast extract (Difco), 0.5 g of proteose peptone No. 3 (Difco), 0.5 g of casamino acids (Difco), 0.5 g of dextrose (Difco), 0.5 g of soluble starch (Difco), 0.3 g of sodium pyruvate (Difco), 0.3 g of dipotassium sulfate (Difco), 0.05 g of magnesium sulfate (Difco) and 15 g of Bacto agar (Difco) to 980 mL of distilled water and sterilizing at 121° C. for 15 minutes under high pressure after adjusting pH to 7.2.
  • Three kinds of antibiotics (Table 2) were used to isolate the non-dominant normal bacteria. Each antibiotic was inoculated at about 50° C. after filter-sterilizing the medium to a concentration of 100 ppm.
  • Fungi were isolated from the air conditioner by culturing on an aerobic plate using nutrient media.
  • Potato dextrose agar medium and malt extract agar medium were used to isolate the fungi (molds).
  • the potato dextrose agar medium was prepared by adding 4 g of potato starch (Difco), 20 g of dextrose (Difco) and 15 g of Bacto agar (Difco) to 980 mL of distilled water and sterilizing at 121° C. for 15 minutes under high pressure after adjusting pH to 5.1.
  • the malt extract agar medium was prepared by adding 20 g of malt extract (Difco) and 15 g (Difco) of Bacto agar to 980 mL of distilled water and sterilizing at 121° C. for 15 minutes under high pressure after adjusting pH to 5.0.
  • a 90 mm ⁇ 15 mm Petri dish was used to culture the fungi and the cultured fungi were isolated using a 60 mm ⁇ 15 mm Petri dish.
  • Dominant strains were isolated and cultured based on dilution ratios or morphological characteristics such as the color, size, shape, etc. of the colonies as follows.
  • REP-PCR is a molecular biological fingerprinting technique for structural analysis of bacterial chromosomes, which allows distinguishment of different bacterial strains. Genetic characterization was carried out by REP-PCR as follows.
  • PCR amplification was carried out by conducting pre-denaturation at 94° C. for 7 minutes and repeating 33 cycles of denaturation at 92° C. for 1 minute, annealing at 51.5° C. for 1 minute and extension at 65° C. for 8 minutes, as described in Table 5.
  • Step 1 93° C. 7 min Step 2 92° C. 1 min Step 3 51.5° C. 1 min Step 4 65° C. 8 min Steps 2, 3, 4: additional 33 cycles Step 6 65° C. 16 min Step 7 4° C.
  • PCR-amplified DNA fragments were loaded onto 1.2-1.5% agarose gel supplemented with EtBr after mixing a 6 ⁇ dye with the sample at a ratio of 1:5. Since most PCR products were in the range of 100-1000 bp, they were loaded tougher with 100 by ladders.
  • the 16S ribosomal ribonucleic acid (rRNA) gene is used to genetic identification of bacteria.
  • the bacteria differentiated by REP-PCR can be identified in the levels of genus and species thereby.
  • 16S rRNA is an RNA which constitutes a ribosome by interacting with various proteins. Since the full sequences or base sequences of oligonucleotides are known for more than 2000 bacterial species, bacteria can be grouped based on the similarity of the 16S rRNA gene. Because the difference in the base sequence of the 16S rRNA gene is much smaller than those of the base sequences of other genes in the genome, the similarity of the base sequence of 16S rRNA is considered as a measure of the evolutionary distance between organisms.
  • microorganisms in particular, industrially useful microorganisms, based on the similarity of the base sequence of 16S rRNA gene fragments has been used as a typical identification method together with fatty acid analysis and carbohydrate assimilation profiling.
  • PCR conditions total 50 ⁇ L: A mixture (44.5 ⁇ L) of the solutions described in Table 6, except for DNA and Taq, was added to the lysis solution described above. Subsequently, PCR amplification was carried out by conducting pre-denaturation at 94° C. for 5 minutes and repeating 29 cycles of denaturation at 94° C. for 1 minute, annealing at 55° C. for 1 minute and extension at 72° C. for 1 minute and 30 seconds, as described in Table 7.
  • Step 1 94° C. 5 min
  • Step 2 94° C. 1 min
  • Step 3 55° C. 1 min
  • Step 4 72° C. 1 min
  • step 2 Go to step 2: additional 29 cycles
  • Step 6 72° C. 10 min
  • Step 7 4° C. hold
  • the 16S rRNA PCR products were purified using a QIAquick PCR purification kit.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • composition PTYG medium (per 1 L of medium, 0.25 g of peptone, 0.25 g of triptone, 0.5 g of yeast extract, 0.5 g of glucose, 30 mg of MgSO 4 and 3 mg of CaCl 2 ) or R2A medium.
  • the microorganisms were cultured in nutrient media at 28° C. for 7 days.
  • the procedure of culturing the bacteria in nutrient media was as follows.
  • a rectangular aluminum fin was sterilized and then dipped in a nutrient medium.
  • culturing was performed in the nutrient medium under the same conditions of the steps ⁇ circle around (2) ⁇ - ⁇ circle around (4) ⁇ .
  • the sensory evaluation result is given in Table 8.
  • Antimicrobial-treated aluminum fin A commercially available, antimicrobial-coated evaporator core product was used.
  • Non-antimicrobial-treated, hydrophilic-coated aluminum fin An aluminum fin which was hydrophilic-coated only, without antimicrobial coating, was specially manufactured for comparison with the antibacterial-coated fin.
  • the evaporator core was manufactured from aluminum to reduce weight, it can also be made from other metals such as copper, stainless steel, etc.
  • the concentration of the microorganisms coated on the fin varied depending on the O.D. values.
  • O.D. was 0.749
  • the coating degree was about 1.53 ⁇ 10 8 ⁇ 1.52 ⁇ 10 7 CFU/g fin.
  • O.D. was 0.588 and 0.55
  • the coating degree was about 4.00 ⁇ 10 7 ⁇ 1.00 ⁇ 10 7 CFU/g fin and 1.03 ⁇ 10 7 ⁇ 8.50 ⁇ 10 5 CFU/g fin, respectively.
  • O.D. was 0.5 and 0.45
  • the coating degree was 6.00 ⁇ 10 6 ⁇ 7.00 ⁇ 10 5 CFU/g fin and 2.53 ⁇ 10 6 ⁇ 3.51 ⁇ 10 5 CFU/g respectively. That is to say, the coating degree was proportional to
  • O.D. The O.D. value of 0.5 at which the microorganisms were coated at a concentration of 10 6
  • CFU/g which is similar to the level of the evaporator core from which the microorganisms were isolated, was selected for coating of the other 10 odorless microorganism species.
  • the 11 odorless microorganism species showed the same coating degree at the same O.D. regardless of the genus. Accordingly, the amount of Methylobacterium aquaticum coated on an evaporator core was measured using a culture corresponding to the O.D. value of the fin.
  • Methylobacterium aquaticum adjusted to O.D. 0.5 showed a coating degree of 8.95 ⁇ 10 6 ⁇ 5.51 ⁇ 10 5 CFU/g fin on the evaporator core.
  • the coating degree was 2.55 ⁇ 10 6 ⁇ 3.51 ⁇ 10 5 CFU/g fin. Accordingly, it was confirmed that the microorganisms was coated with the same degree when the culture of the same O.D. is used.
  • each of the 11 odorless microorganism species was coated on an evaporator core.
  • Step 1 After supplying gasoline (nutritional source for microorganisms), a reconstitution apparatus was operated for 2 hours (temperature: 25° C., humidity: 50-90%, air velocity: 170 CMH, nutritional source: 10 ppm gasoline).
  • Step 2 After stopping the operation of the reconstitution apparatus (temperature: 25° C., humidity: 30-50%, air velocity: 0 CMH), odor was evaluated after slightly opening the inlet of the reconstitution apparatus.
  • the 8 odorless microorganism species selected based on the sensory evaluation was combined with Methylobacterium aquaticum and Methylobacterium platani to obtain 14 optimized combinations of odorless microorganisms.
  • For sensory evaluation of the combinations of odorless microorganisms they were mixed with the same density and coated on an evaporator core.
  • the average sensory evaluation score of the 14 combinations was 1.89 ⁇ 0.52 (5-point scale).
  • the combination 14 which contained the common strains as well as Acinetobacter johnsonii, Sphingomonas aquatilis and Pseudomonas nitroreducens showed the lowest sensory evaluation score of 1.25 and the combination containing the common strains and Acinetobacter johnsonii showed the highest sensory evaluation score of 3.14 (Table 10).
  • the 10 combinations excluding the 2 combinations containing the common strains and one of Acinetobacter johnsonii and Brevibacillus invocatus , the combination 7 containing Brevibacillus invocatus, Sphingomonas aquatilis and Methylobacterium komagatae , and the combination 13 containing Leifsonia soli, Sphingomonas aquatilis and Pseudomonas nitroreducens were selected for a final survival test.
  • the microorganisms were cultured and coated on an evaporator core in order from the combination 1 to the combination 10.
  • the coating degree was 10 6 CFU/g fin.
  • the combination 1 showed a coating degree of 1.09 ⁇ 10 7 ⁇ 8.65 ⁇ 10 5 CFU/g fin on the evaporator core.
  • a red colony was detected at 8.70 ⁇ 10 6 ⁇ 2.35 ⁇ 10 6 CFU/g fin, a white colony at 2.50 ⁇ 10 5 ⁇ 7.07 ⁇ 10 4 CFU/g fin, and a yellow colony at 1.90 ⁇ 10 6 ⁇ 1.73 ⁇ 10 5 CFU/g fin.
  • the total bacterial count was 4.63 ⁇ 10 5 ⁇ 5.09 ⁇ 10 4 CFU/g fin, with that of the red colony only being 4.63 ⁇ 10 6 ⁇ 1.53 ⁇ 10 5 CFU/g fin ( FIG. 2 ).
  • the red colony was suspected to contain Methylobacterium which contains a pink pigment.
  • Methylobacterium platani and Brevibacillus invocatus were not detected at time 0.
  • Methylobacterium platani that was used as a common strain was not detected.
  • Methylobacterium aquaticum was detected the most in 70 out of a total of 86 REP-PCR samples at time 0.
  • Sphingomonas aquatilis was detected in 12 samples, and Pseudomonas nitroreducens was detected in 4 samples. After 30 days, Methylobacterium aquaticum was detected in all the 32 samples, whereas the other microorganisms were not detected ( FIG. 4 ).
  • Acinetobacter johnsonii, Sphingomonas aquatilis and Pseudomonas nitroreducens were used together with the common strains Methylobacterium aquaticum and Methylobacterium platani .
  • the total bacterial count on the evaporator core was 1.52 ⁇ 10 7 ⁇ 5.42 ⁇ 10 5 CFU/g fin.
  • the total bacterial count on the evaporator core was 3.23 ⁇ 10 6 ⁇ 8.39 ⁇ 10 4 CFU/g fin.
  • the total bacterial count was 1.83 ⁇ 10 7 ⁇ 3.89 ⁇ 10 5 CFU/g fin at time 0.30 days later, total bacterial count was 5.23 ⁇ 10 6 ⁇ 1.50 ⁇ 10 5 CFU/g fin.
  • the population of microorganisms was analyzed by REP-PCR, among the 5 microorganisms contained in the combination, 4 microorganisms Methylobacterium aquaticum, Acinetobacter johnsonii, Sphingomonas aquatilis and Methylobacterium komagatae excluding Methylobacterium platani were surviving on the evaporator core at time 0.
  • Methylobacterium komagatae as well as Methylobacterium aquaticum , one of the common strains, was surviving.
  • Methylobacterium aquaticum was detected in 49 samples, Acinetobacter johnsonii was detected in 1 sample, Sphingomonas aquatilis was detected in 11 samples, and Methylobacterium komagatae was detected in 40 samples.
  • Methylobacterium aquaticum was detected in 19 samples and Methylobacterium komagatae was detected in 15 samples ( FIG. 6 ). It was found that the ratio of the surviving two Methylobacterium species was constant at about 1:1 for 30 days ( FIG. 7 ).
  • the total bacterial count of the 5 strains was 2.04 ⁇ 10 7 ⁇ 4.91 ⁇ 10 5 CFU/g fin at the time of coating.
  • the population of microorganisms was analyzed by REP-PCR, out of 86 samples, Methylobacterium aquaticum was detected in 80 samples, Methylobacterium platani was detected in 1 sample, Brevibacillus invocatus was detected in 3 samples, and Pseudomonas nitroreducens was detected in 2 samples ( FIG. 8 ).
  • the combination 5 consisted of 4 strains Methylobacterium aquaticum, Methylobacterium platani, Acinetobacter johnsonii and Pseudomonas nitroreducens .
  • the total bacterial count was 2.86 ⁇ 10 7 ⁇ 1.19 ⁇ 10 6 CFU/g fin.
  • Methylobacterium komagatae was selected as a microorganism to replace Methylobacterium platani , which showed poor survivability in the survival evaluation for 30 days.
  • Methylobacterium komagatae was combined with the common strain Methylobacterium aquaticum to prepare 6 additional combinations of microorganisms (Table 12). The additionally prepared combinations contained a small number of microorganisms that exhibited excellent survivability, although they were not odorless, in order to prepare more stable combinations.
  • Methylobacterium aquaticum Methylobacterium komagatae , Spirosoma linguale , Sphingomonas dokdonensis and Leifsonia soli
  • Methylobacterium aquaticum Methylobacterium komagatae
  • Microbacterium flavescens Leifsonia shinshuensis and Methylobacterium aerolatum
  • Methylobacterium aquaticum , Methylobacterium komagatae Spirosoma panaciterrae, Flavobacterium oceanosedimentum and Brevundimonas kwangchunensis
  • Methylobacterium aquaticum Methylobacterium komagatae
  • Methylobacterium brachiatum Paenibacillus timonensis and Rhizobium massiliae
  • Bacillus licheniformis Bacillus licheniformis
  • the total bacterial count on the evaporator core was 4.30 ⁇ 10 6 ⁇ 1.25 ⁇ 10 6 CFU/g fin at the time of coating. Even after 30 days, the microorganisms were surviving at 4.30 ⁇ 10 6 ⁇ 1.25 ⁇ 10 6 CFU/g fin.
  • the population of the coated microorganisms was investigated by REP-PCR pattern analysis, out of 45 samples, Methylobacterium aquaticum was detected in 8 samples and Methylobacterium komagatae was detected in 37 samples. After 30 days, out of 20 samples, Methylobacterium aquaticum was detected in 5 samples, Methylobacterium komagatae was detected in 15 samples. Although the ratio of Methylobacterium aquaticum was slightly increased, the change was not significant ( FIG. 10 ).
  • the total bacterial count was 2.07 ⁇ 10 7 ⁇ 1.11 ⁇ 10 6 CFU/g fin at time 0. After 30 days, the total bacterial count was 1.74 ⁇ 10 7 ⁇ 1.30 ⁇ 10 6 CFU/g fin.
  • Methylobacterium aquaticum was detected in 1 sample and Methylobacterium komagatae was detected in 11 samples. All of the other 22 samples were found to be Deinococcus apachensis . That is to say, 40% or more of the coated microorganisms was
  • Methylobacterium aquaticum Methylobacterium komagatae, Spirosoma linguale, Sphingomonas dokdonensis and Leifsonia soli were used.
  • the total bacterial count was 7.53 ⁇ 10 6 ⁇ 3.74 ⁇ 10 5 CFU/g fin.
  • the total bacterial count was 3.70 ⁇ 10 6 ⁇ 1.37 ⁇ 10 5 CFU/g fin.
  • Methylobacterium aquaticum was detected in 4 samples, Methylobacterium komagatae was detected in 30 samples, Spirosoma linguale was detected in 3 samples and Sphingomonas dokdonensis was detected in 14 samples at time 0.
  • Methylobacterium aquaticum was 29.6% and Methylobacterium komagatae was 59.2%. That is to say, the ratio of Methylobacterium aquaticum was slightly increased. Spirosoma linguale was not detected and the ratio of Sphingomonas dokdonensis was slightly decreased to 11.1% as compared to time 0 ( FIG. 12 ).
  • the total bacterial count at time 0 was 1.75 ⁇ 10 7 ⁇ 1.24 ⁇ 10 6 CFU/g fin. After 30 days, the total bacterial count was 6.03 ⁇ 10 6 ⁇ 1.01 ⁇ 10 6 CFU/g fin.
  • Methylobacterium aquaticum was 16.3%
  • Methylobacterium komagatae was 47.3%
  • Microbacterium flavescens was 36.4% at time 0.
  • Methylobacterium aquaticum was increased to 34.3% and Methylobacterium komagatae was also increased slightly to 57.1%.
  • Microbacterium flavescens was decreased to 8.6% ( FIG. 13 ).
  • the total bacterial count was 8.53 ⁇ 10 6 ⁇ 3.21 ⁇ 10 5 CFU/g fin at time 0. After 30 days, the total bacterial count was 1.20 ⁇ 10 6 ⁇ 3.84 ⁇ 10 4 CFU/g fin.
  • population was analyzed by REP-PCR, out of 75 samples, Methylobacterium aquaticum was detected in 8 samples, Methylobacterium komagatae was detected in 21 samples, Flavobacterium oceanosedimentum was detected in 32 samples and Brevundimonas kwangchunensis was detected in 14 samples at time 0.
  • Methylobacterium aquaticum was detected in 16 samples
  • Methylobacterium komagatae was detected in 32 samples
  • Flavobacterium oceanosedimentum was detected in 39 samples
  • Brevundimonas kwangchunensis was detected in 2 samples, respectively ( FIG. 14 ).
  • the combination F 6 strains including the two Methylobacterium sp. common strains were used. At time 0, the total bacterial count was 1.60 ⁇ 10 7 ⁇ 1.15 ⁇ 10 6 CFU/g fin. After 30 days, the total bacterial count was 9.03 ⁇ 10 6 ⁇ 2.42 ⁇ 10 5 CFU/g fin.
  • the population of the strains was analyzed by REP-PCR, out of 71 representative samples, Methylobacterium aquaticum was detected in 54 samples and Methylobacterium komagatae was detected in 17 samples at time 0. After 30 days, Methylobacterium aquaticum was detected in 50 samples and Methylobacterium komagatae was detected in 23 samples out of 73 samples ( FIG. 15 ).
  • Methylobacterium aquaticum and Methylobacterium komagatae were tested for 90 days.
  • the total bacterial count was measured to be 1.92 ⁇ 10 7 ⁇ 8.02 ⁇ 10 5 CFU/g fin at time 0. 5 g of the fin was taken every 30 days and the total bacterial count was measured. The number of surviving bacterial was 8.70 ⁇ 10 6 ⁇ 6.56 ⁇ 10 5 CFU/g fin after 30 days, 4.10 ⁇ 10 6 ⁇ 3.00 ⁇ 10 5 CFU/g fin after 60 days and 3.13 ⁇ 10 6 ⁇ 5.51 ⁇ 10 5 CFU/g fin after 90 days ( FIGS. 16). 71 , 66 , 41 and 44 representative samples taken from each sampling location were subjected to REP-PCR pattern analysis.
  • Methylobacterium aquaticum was detected in 37 samples and Methylobacterium komagatae was detected in 34 samples. After 30, 60 and 90 days, the numbers of the samples were 35 and 31, 27 and 14, and 25 and 19, respectively ( FIG. 17 ). That is to say, the % ratio of Methylobacterium aquaticum was 52.1-65.8% and that of Methylobacterium komagatae was 34.1-47.9%. This uniform ratio suggests that the two strains can coexist for a long-term period.
  • Example 14 Survival evaluation of combinations of common strains on vehicle jig
  • the total bacterial count was 3.20 ⁇ 10 7 ⁇ 6.56 ⁇ 10 6 CFU/g fin.
  • the total bacterial count on the evaporator core was 6.23 ⁇ 10 6 ⁇ 1.99 ⁇ 10 5 CFU/g fin after 30 days and 1.08 ⁇ 10 6 ⁇ 4.36 ⁇ 10 4 CFU/g fin after 60 days ( FIG. 18 ).
  • the evaporator core was exposed to the outdoor environment, no exogenous microorganism other than the colony of Methylobacterium sp. was detected after 60 days.
  • the ratio of the strains was 1:1 at time 0. After 30 days, Methylobacterium aquaticum was decreased to 4.2% and, after 60 days, only Methylobacterium komagatae was detected ( FIG. 19 ).
  • the 11 odorless microorganism species isolated from the evaporator core were divided into 4 groups based on morphological characteristics.
  • the 11 microorganism species were identified as different species through 16S rDNA sequencing.
  • microorganisms identified by 16S rDNA sequencing were subjected to REP-PCR and were found to be 11 different REP-PCR groups.
  • a combination consisting only of the two common strains Methylobacterium aquaticum and Methylobacterium komagatae was subjected to survival evaluation for 90 days. As a result of conducting survival evaluation for 90 days under a laboratory condition, the combination maintained a similar population as that at the time of coating.
  • an evaporator core coated with the combination of microorganisms was installed on a jig of a vehicle roof and survivability was evaluated after exposure to outdoor air. As a result, the total bacterial count was maintained at 10 6 CFU/g fin and no exogenous microorganism was detected.
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CN105264063B (zh) 2018-12-11
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CA2895973A1 (en) 2014-06-26
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