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Journal of microbiology and biotechnology 25건

  1. [국내논문]   Inhibition of Melanogenesis by Dioctyl Phthalate Isolated from Nigella glandulifera Freyn   피인용횟수: 3

    Nguyen, Duc T. M. (Department of Biological Engineering, Inha University ) , Nguyen, Dung H. (Department of Biological Engineering, Inha University ) , Hwa-La, Lyun (Department of Biological Engineering, Inha University ) , Lee, Hyang-Bok (Department of Biological Engineering, Inha University ) , Shin, Jeong-Hyun (Department of Dermatology, Inha University School of Medicine ) , Kim, Eun-Ki (Department of Biological Engineering, Inha University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1585 - 1590 , 2007 , 1017-7825 ,

    초록

    Although a number of melanogenesis inhibitors have recently been reported and used as cosmetic additives, none is completely satisfactory, leaving a need for novel skin-depigmenting agents. Thus, to develop a novel skin depigmenting agent from natural sources, the inhibition of melanogenesis by Chinese plants was evaluated. A methanolic extract of Nigella glandulifera Freyn was found to inhibit the melanin synthesis of murine B16F10 melanoma cells by 43.7% and exhibited a low cytotoxicity (8.1%) at a concentration of $100\;{\mu}g/ml$ . Thus, to identify the melanogenesis-inhibiting mechanism, the inhibitory activity towards tyrosinase, the key enzyme of melanogenesis, was further evaluated, and the results showed inhibitory effects on the activity of intracellular tyrosinase yet not on mushroom tyrosinase. Finally, to isolate the compounds with a hypopigmenting capability, activity-guided isolation was performed, and Dioctyl phthalate identified as inhibiting melanogenesis.

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  2. [국내논문]   Fatty Acid and Carotenoid Production by Sporobolomyces ruberrimus when Using Technical Glycerol and Ammonium Sulfate   피인용횟수: 2

    Razavi, Seyed Hadi (Department of Food Science & Engineering, Faculty of Biosystem Engineering, University of Tehran ) , Mousavi, Seyed Mohammad (Department of Food Science & Engineering, Faculty of Biosystem Engineering, University of Tehran ) , Yeganeh, Hassan Mehrabani (University College of Agriculture & Natural Resources, University of Tehran ) , Marc, Ivan (Laboratoire des Science du Genie Chimique)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1591 - 1597 , 2007 , 1017-7825 ,

    초록

    The production of carotenoids, lipid content, and fatty acid composition were all studied in a strain of Sporobolomyces ruberrimus when using different concentrations of technical glycerol as the carbon source and ammonium sulfate as the nitrogen source. The total lipids represented an average of 13% of the dry weight, and the maximum lipids were obtained when using 65.5 g/l technical glycerol (133.63 mg/g). The optimal conditions for fatty acid production were at $27^{\circ}C$ using 20 g of ammonium sulfate and a pH range from 6 to 7, which produced a fatty acid yield of $32.5{\pm}1\;mg/g$ , including $1.27{\pm}0.15\;mg$ of linolenic acid (LNA), $7.50{\pm}0.45\;mg$ of linoleic acid (LLA), $5.50{\pm}0.35\;mg$ of palmitic acid (PA), $0.60{\pm}0.03\;mg$ of palmitoleic acid (PAL), $1.28{\pm}0.11\;mg$ of stearic acid (SA), $9.09{\pm}0.22\;mg$ of oleic acid, $2.50{\pm}0.10\;mg$ of erucic acid (EA), and $4.25{\pm}0.20\;mg$ of lignoceric acid (LCA), where the palmitic, oleic, and linoleic acids combined formed about 37% of the total fatty acids. The concentration of total carotenoids was 2.80 mg/g when using 20 g of ammonium sulfate, and consisted of torularhodin (2.70 mg/g) and $\beta$ -carotene (0.10 mg/g), at $23^{\circ}C$ and pH 6. However, the highest amount with the maximum specific growth rate was obtained ( ${\mu}_{max}=0.096\;h^{-1}$ ) with an ammonium sulfate concentration of 30 g/l.

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  3. [국내논문]   Molecular Modeling, Synthesis, and Screening of New Bacterial Quorum-sensing Antagonists   피인용횟수: 3

    Kim, Cheol-Jin (School of Chemical & Biological Engineering, Seoul National University ) , Kim, Jae-Eun (School of Chemical & Biological Engineering, Seoul National University ) , Park, Hyung-Yeon (Department of Chemistry, College of Natural Science, Inha University ) , Mclean, Robert J.C. (Department of Biology, Texas State University ) , Kim, Chan-Kyung (Department of Chemistry, College of Natural Science, Inha University ) , Jeon, Jong-Ho (School of Chemical & Biological Engineering, Seoul National University ) , Yi, Song-Se (School of Chemical & Biological Engineering, Seoul National University ) , Kim, Young-Gyu (School of Chemical & Biological Engineering, Seoul National University ) , Lee, Yoon-Sik (School of Chemical & Biological Engineering, Seoul National University ) , Yoon, Je-Yong (School of Chemical & Biological Engineering, Seoul National University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1598 - 1606 , 2007 , 1017-7825 ,

    초록

    A new series comprising 7 analogs of N-(sulfanyl ethanoyl)-L-HSL derivatives, 2 analogs of N-(fluoroalkanoyl)- $_L$ -HSL derivatives, N-(fluorosulfonyl)-L-HSL, and 2,2-dimethyl butanoyl HSL were synthesized using a solid-phase organic synthesis method. Each of the 11 synthesized compounds was analyzed using NMR and mass spectroscopies, and molecular modeling studies of the 11 ligands were performed using SYBYL packages. Thereafter, a bacterial test was designed to identify their quorum-sensing inhibition activity and antifouling efficacy. Most of the synthesized compounds were found to be effective as quorum-sensing antagonists, where antagonist screening revealed that 10 among the 11 synthesized ligands were able to antagonize the quorum sensing of A. tumefaciens.

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  4. [국내논문]   Bacterial ${\beta}$-Lactamase Fragment Complementation Strategy Can Be Used as a Method for Identifying Interacting Protein Pairs  

    Park, Jong-Hwa (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Back, Jung-Ho (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Hahm, Soo-Hyun (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Shim, Hye-Young (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Park, Min-Ju (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Ko, Sung-Il (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University ) , Han, Ye-Sun (Department of Advanced Technology Fusion and Bio-Molecular Informatics Center, Konkuk University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1607 - 1615 , 2007 , 1017-7825 ,

    초록

    We investigated the applicability of the TEM-l ${\beta}$ -lactamase fragment complementation (BFC) system to develop a strategy for the screening of protein-protein interactions in bacteria. A BFC system containing a human Fas-associated death domain (hFADD) and human Fas death domain (hFasDD) was generated. The hFADD-hFasDD interaction was verified by cell survivability in ampicillin-containing medium and the colorimetric change of nitrocefin. It was also confirmed by His pull-down assay using cell lysates obtained in selection steps. A coiled-coil helix coiled-coil domain-containing protein 5 (CHCH5) was identified as an interacting protein of human uracil DNA glycosylase (hUNG) from the bacterial BFC cDNA library strategy. The interaction between hUNG and CHCH5 was further confirmed with immunoprecipitation using a mammalian expression system. CHCH5 enhanced the DNA glycosylase activity of hUNG to remove uracil from DNA duplexes containing a U/G mismatch pair. These results suggest that the bacterial BFC cDNA library strategy can be effectively used to identify interacting protein pairs.

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  5. [국내논문]   Direct Detection of Shigella flexneri and Salmonella typhimurium in Human Feces by Real-Time PCR   피인용횟수: 3

    Yang, Young-Geun (Department of Clinical Laboratory Science, College of Health Sciences, Korea University ) , Song, Man-Ki (International Vaccine Institute ) , Park, Su-Jeong (DNA Analysis Laboratory, Forensic Science Division, Supreme Prosecutors' Office ) , Kim, Suhng-Wook (Department of Clinical Laboratory Science, College of Health Sciences, Korea University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1616 - 1621 , 2007 , 1017-7825 ,

    초록

    We have established a SYBR Green-based realtime PCR method using AnyDirect solution, which enhances PCR from whole blood, for direct amplification of the virA gene of Shigella flexneri and the invA gene of Salmonella typhimurium from human feces without prior DNA purification. When we compared the efficiency of conventional or realtime PCR amplification of the virA and invA genes from the supernatant of boiled feces supplemented with S. flexneri and S. typhimurium in the presence or absence of AnyDirect solution, amplification products were detected only in reactions to which AnyDirect solution had been added. The detection limit of real-time PCR was $1{\times}10^4\;CFU/g$ feces for S. flexneri and $2{\times}10^4\;CFU/g$ feces for S. typhimurium; this sensitivity level was comparable to other studies. Our real-time PCR assay with AnyDirect solution is simple, rapid, sensitive, and specific, and allows simultaneous detection of S. flexneri and S. typhimurium directly from fecal samples without prior DNA purification.

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  6. [국내논문]   Removal of Serratia marcescens Aerosols Using an Electrostatic Precipitator Air-Cleaner  

    Ko, Gwang-Pyo (Department of Environmental Health, Institute for Health and Environment, School of Public Health, Seoul National University ) , Burge, Harriet (Department of Environmental Health, Harvard School of Public Health)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1622 - 1628 , 2007 , 1017-7825 ,

    초록

    We characterized the efficacy of an electrostatic precipitator (ESP) air-cleaner in reducing the concentration of Serratia marcescens in an enclosed space. We used an experimental room ( $4.5{\times}3{\times}2.9\;m$ ) in which electrostatic air-cleaners were located. Two air-cleaners enhanced the equivalent ventilation rates in the chamber by about 3.3 air changes per hour (ACH) over the 2 ACH provided by the mechanical ventilation system. Natural die-off of the organisms provided an additional equivalent of 3 ACH, so that the total ventilation rate with the ESP air-ccleaners was 8.3 ACH. We also examined whether the ESP air-cleaners altered the deposition of Serratia marcescens aerosols on the experimental room surfaces. We did not find any significant differences in the number of colony forming units recovered from surfaces with and without the air-cleaners. We installed UV lights inside the ESPs and determined if UV light, in addition to electrical fields, increased the efficacy of the ESPs. The presence of UV light inside the ESP reduced S. marcescens aerosols by approximately 2 ACH. Finally, a box model indicates that the efficiency of the air-cleaner increases for both biological and nonbiological particles at ventilation rates of 0.2-1, which are typical for residential settings.

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  7. [국내논문]   Development of Immunochromatography Strip-Test Using Nanocolloidal Gold-Antibody Probe for the Rapid Detection of Aflatoxin B1 in Grain and Feed Samples   피인용횟수: 3

    Shim, Won-Bo (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University ) , Yang, Zheng-You (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University ) , Kim, Jung-Sook (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University ) , Kim, Ji-Young (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University ) , Kang, Sung-Jo (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University ) , Woo, Gun-Jo (Center for Food Safety Evaluation, Korea Food and Drug Administration ) , Chung, Young-Chul (Division of Food Science, Jinju International University ) , Eremin, Sergei A. (Division of Chemical Enzymology, Faculty of Chemistry, M. V. Lomonosov Moscow State University ) , Chung, Duck-Hwa (Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1629 - 1637 , 2007 , 1017-7825 ,

    초록

    An immunochromatography (ICG) strip test using a nanocolloidal gold-antibody probe was developed and optimized for the rapid detection of aflatoxin B1 (AFB1). A monoclonal antibody specific to AFB1 was produced from the cloned hybridoma cell (AF78), coupled with nanocolloidal gold, and distributed on the conjugate pad of the ICG strip test. The visual detection limit of the ICG strip test was 0.5 ng/ml, and this method showed a cross-reaction to aflatoxin B2, G1, and G2. In total, 172 grain and feed samples were collected and analyzed by both the ICG strip test and HPLC. The results of the ICG strip test showed a good agreement with those obtained by HPLC. These results indicated that the ICG strip test has a potential use as a rapid and cost-effective screening tool for the determination of AFB1 in real samples and could be applied to the preliminary screening of mycotoxin in food and agricultural products, generating results within 15 min without complicated steps.

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  8. [국내논문]   Lipase Activity and Tacrolimus Production in Streptomyces clavuligerus CKD 1119 Mutant Strains  

    Kim, Hyung-Soo (Department of Biotechnology, School of Life Science and Biotechnology, Korea University ) , Park, Young-In (Department of Biotechnology, School of Life Science and Biotechnology, Korea University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1638 - 1644 , 2007 , 1017-7825 ,

    초록

    The effect of carbon sources on tacrolimus production by a mutant strain of Streptomyces clavuligerus CKD 1119, an isolate from soil, was examined. Among the carbohydrates and oils tested in this work, a mixed carbon source of soluble starch and com oil was the best. An analysis of the culture kinetics also showed that, in contrast to the carbohydrates, the com oil was consumed later in the antibiotic production phase, implying that the oil substrate was the principal carbon source for the biosynthesis of tacrolimus, and this was directly proven by experiments using $^{14}C$ -glucose and $^{14}C$ -oleate substrates. Furthermore, com oil induced the formation of lipase by the mutant strain, whereas the addition of glucose significantly repressed lipase activity. The lipase activity exhibited by the FK-506-overproducing mutants was also observed to be directly proportional to their tacrolimus yield, indicating that a high lipase activity is itself a crucial factor for tacrolimus production. A feasibility study with a 200-1 pilot-scale fermentor and the best strain (Tc-XII-15322) identified in this work revealed a high volumetric and specific productivity of about 495 mg/l and 0.34 mg/mg dry mycelium, respectively.

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  9. [국내논문]   Influence of Plant Species and Environmental Conditions on Epiphytic and Endophytic Pink-Pigmented Facultative Methylotrophic Bacterial Populations Associated with Field-grown Rice Cultivars  

    Madhaiyan, Munusamy (Department of Agricultural Chemistry, Chungbuk National University ) , Poonguzhali, Selvaraj (Department of Agricultural Chemistry, Chungbuk National University ) , Sa, Tong-Min (Department of Agricultural Chemistry, Chungbuk National University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1645 - 1654 , 2007 , 1017-7825 ,

    초록

    The total methylotrophic population associated with rice plants from different cultivars was enumerated at three different stages: vegetative, flowering, and harvesting. The bacterial population in the leaf, rhizosphere soil, endophytic in the stem and roots, and epiphytic in the florets and grains were determined from four rice cultivars, Il-mi, Nam-pyeoung, O-dae, and Dong-jin, sampled from three different field sites. The methylotrophic bacteria isolated on AMS media containing 0.5% methanol as the sole carbon source uniformly showed three distinct morphologies, which were recorded as separate groups and their distribution among the various samples was determined using the ecophysiological index. The growth stage at the time of sampling had a more significant effect on the methylotrophic population and their distribution than the field site or cultivar. A similar effect was also observed for the PPFMs, where their population in different plant parts increased from V10 to R4 and then decreased towards stage R9. A canonical discriminant analysis of the PPFM population from different parts of rice showed clear variations among the cultivars, sampled sites, and growth stages, although the variations were more prominent among the growth stages.

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  10. [국내논문]   Selection and Characterization of Forest Soil Metagenome Genes Encoding Lipolytic Enzymes   피인용횟수: 2

    Hong, Kyung-Sik (Bio-Organic Science Division, Korea Research Institute of Chemical Technology ) , Lim, He-Kyoung (Bio-Organic Science Division, Korea Research Institute of Chemical Technology ) , Chung, Eu-Jin (Division of Applied Biology, College of Natural Resources and Life Science, Dong-A University ) , Park, Eun-Jin (Division of Applied Biology, College of Natural Resources and Life Science, Dong-A University ) , Lee, Myung-Hwan (Division of Applied Biology, College of Natural Resources and Life Science, Dong-A University ) , Kim, Jin-Cheol (Bio-Organic Science Division, Korea Research Institute of Chemical Technology ) , Cho, Gyung-Ja (Bio-Organic Science Division, Korea Research Institute of Chemical Technology ) , Cho, Kwang-Yun (Bio-Organic Science Division, Korea Research Institute of Chemical Technology ) , Lee, Seon-Woo (Division of Applied Biology, College of Natural Resources and Life Science, Dong-A University)
    Journal of microbiology and biotechnology v.17 no.10 ,pp. 1655 - 1660 , 2007 , 1017-7825 ,

    초록

    A metagenome is a unique resource to search for novel microbial enzymes from the unculturable microorganisms in soil. A forest soil metagenomic library using a fosmid and soil microbial DNA from Gwangneung forest, Korea, was constructed in Escherichia coli and screened to select lipolytic genes. A total of seven unique lipolytic clones were selected by screening of the 31,000-member forest soil metagenome library based on tributyrin hydrolysis. The ORFs for lipolytic activity were subcloned in a high copy number plasmid by screening the secondary shortgun libraries from the seven clones. Since the lipolytic enzymes were well secreted in E. coli into the culture broth, the lipolytic activity of the subclones was confirmed by the hydrolysis of p-nitrophenyl butyrate using culture supernatant. Deduced amino acid sequence analysis of the identified ORFs for lipolytic activity revealed that 4 genes encode hormone-sensitive lipase (HSL) in lipase family IV. Phylogenetic analysis indicated that 4 proteins were clustered with HSL in the database and other metagenomic HSLs. The other 2 genes and 1 gene encode non-heme peroxidase-like enzymes of lipase family V and a GDSL family esterase/lipase in family II, respectively. The gene for the GDSL enzyme is the first description of the enzyme from metagenomic screening.

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