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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Microbiology and Biotechnology Letters
Journal Basic Information
Journal DOI :
The Korean Society for Applied Microbiology and Biotechnology
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Volume & Issues
Volume 31, Issue 4 - Dec 2003
Volume 31, Issue 3 - Sep 2003
Volume 31, Issue 2 - Jun 2003
Volume 31, Issue 1 - Mar 2003
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Bioactive Substances from Myxobacteria.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 1~12
Myxobacteria are soil bacteria that move by gliding and have a complicated life cycle. In the research over the 25 years the myxobacteria have been shown to be a rich source of potentially useful bioactive substances. So far about 80 different basic compounds and 450 structural variants have been characterized. It is remarkable that myxobacteria produce the substance has special mechanisms. 26 new electron transport inhibitors,5 inhibitors of nucleic acid polymerases, 10 substances that act on the cytoskeleton, and 1 inhibitor of fungal acetyl-CoA carboxylase have been found. Presently, large-scale technical process was not fully established. But one of the compounds from myxobacteria is able to pass the many thresholds, which are on the road to application.
The Distribution of Serogroup of Vibrio cholerae non-O1 Isolated in Korea
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 13~17
The studies were carried out to identification of biochemical characteristics and serogroup of 55 Vibrio cholerae non-01 isolated from sea waters and shellfish from Apr., 1996 to Nov., 1996 in Korea coastal, and clinical sources from 1984 to 1996 in Korea hospitals. The results were as followed: V. cholerae non-O1 isolated 21 (10%) of 206 samples and the distribution in Kusan area was highest (16%) compared with those of other area, and its were not isolated during low water temperature of 13-18
. Of 55 strains, a strain was delayed sucrose utilization for 48hr in the biochemical characteristics. Fifty five V. cholerae non-O1 were differentiated 15 types by serogroup test and O14 of sea waters were 76% of highest followed by 14 clinical sources were O8.
Isolation of Nitrogen-Fixing Bacteria from Gramineous Crops and Measurement of Nitrogenase Activity
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 18~24
For researching nitrogen-fixing bacteria associated with gramineous crops, we collected growing roots of rices, wheats, oats, barleys, ryes, and maizes at 19 sites of southern Korean peninsula. Endophytes and free living bacteria were isolated from those crop roots. Sixty-three isolates were classified on the basis of different morphology, size, color, host of colony, and the 16S rDNAs sequence. The analyses of PCR amplification for nifH gene and nitrogenase activity assay, revealed that all isolates contained nitrogen-fixing abilities. In addition, most of them have cellulase activity which is one of the common features of endophytic bacteria from plant.
Cloning Genes Involved in Aniline Degradation from Delftia acidovorans.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 25~31
Delftia acidovorans 51-A isolated from river water degrades aniline. In order to clone genes involved in aniline degradation, transposon Tn5-B20 was inserted into the strain 51-A to generate a mutant strain 10-4-2 that cannot utilize aniline as a carbon source. The mutant strain was not an auxotroph but could not degrade aniline. Southern hybridization analysis indicated that the transposon was inserted into the mutant bacterial DNA as a single copy. Flanking DNA fragment of Tn5-B2O insertion was cloned and sequenced. DNA sequence analysis revealed three ORFs encoding TdnQ, TdnT, and TdnA 1 that arc responsible for catechol formation from aniline through oxidative deamination. The analysis also confirmed that Tn5-B2O was inserted at the immediate downstream of tdnA1. The result suggests that the transposon insertion behind tdirA1 disrupted the pathway of the catechol formation from aniline, resulting in the mutant phenotype, which cannot degrade aniline. A large plasmid over 100-kb in size was detected from D. acidovorans 51-A and Southern hybridization analysis with Tn5-B2O probe showed that the transposon was inserted on the plasmid named pTDN51. Our results indicated that the tdn genes on pTDN51 of D. acidovorans 51-A are involved in aniline degradation.
The Antibacterial Activity of Garlic Juice Against Pathogenic Bacteria and Lactic Acid Bacteria.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 32~35
This study was carried out to determine the inhibitory effect of garlic juice against Escherichia coli, Listeria monocytogenes, Pseudomonas aeruginosa, Salmonella typhimurium, Shigella flexneri. Staphylococcus aureus, Streptococcus mutans, Virio. parahaemolyticus which are food pathogenic bacteria and Lactobacillus acidophilus, Lactobacillus brevis, Lactobacillus casei, Lactobacillus plantarum, Lactococcus. lactis, Leuconostoc mesenteroides which are lactic acid bacteria. An aqueous extract of garlic was bacteriocidal against Gram-positive and Gram-negative bacteria in all concentrations (0.1∼2.5(w/v)%) tested in this experiment. Especially 0.5(w/v)% garlic juice inactivated completely E. coli, S. typhimurium, S. flexineri, V. parahaemolyticus and 1.0(w/v)% garlic juice perfectly reduced P. aeruginosa, S. mutans. Generally, the experiment result indicate that garlic juice restrains the growth of the pathogenic bacteria better than the lactic acid bacteria. Therefore, garlic has potential for the preservation of processed foods.
Improvement of Production and Secretion of Heterologous \alpha-Amylase from Saccharomyces cerevisiae.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 36~41
In order to increase the production and secretion rate of mouse salivary
-amylase from Saccharomyces cerevisiae, various experiments were attempted. A plasmid pCNNinv (AMY) was constructed by the substitution of ADCl promoter and native signal sequence of mouse salivary
-amylase cDNA gene with PRBI promoter and yeast invertase leader sequence, which resulted in 25% increase in the production of
-amylase in the culture medium. The respiratory deficient transformant carrying pCNNinv (AMY) were obtained by treating yeast cells with ethidium bromide, and the
-amylase activities in the culture brothes of the respiratory-deficient transformants were 5-8 times higher than that of parental wild type strain.
-Amylase activity was also increased 3 times when the 0.015% (w/v) of 2-mercaptoethanol was added to the culture medium.
Studies on the Production of Cellulase by Trichoderma sp. SO-571 and the Enzyme Treatment for Cellulosic Fabrics.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 42~45
A Trichoderma sp. SO-571 producing cellulase was isolated from soil, and a pilot-scale cultivation and separation of cellulase were conducted. The cellulase activity was about 14.5 unit/ml after 112 hr of cultivation in a 301 fermenter containing 3.0% cellulose, 4.0% soybean powder, 3.0% wheat bran, 0.5% (
0.2% urea, 1.0% CSL, 0.5%
, and 0.2% Tween 80. The cellulase was purified over 4.6 folds in three steps with 47.86% yield. The optimum pH of cellulase was pH 5.0 and optimum temperature was
. To investigate the effect of the cellulase-treated cellulosic fabric, the weight loss was compared. The weight loss of denim treated with cellulase from Trichoderma sp.SO-571 was 2.9% and that with Celluclast 1.5L was 2.2%. In tencel treatement with enzyme, cellulase showed 0.7% higer weight loss than that with Celluclast 1.5L.
Optimization for Lacticin SA72 Production by Lactococcus lactis SA72 Isolated from Jeot-gal.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 46~50
Lactococcus lactis SA72 from Jeot-gal (Korean traditional fermented fish foods) produces lacticin SA72. The influence of several parameters on the fermentative production of lacticin SA72 by Lactococcus lactis SA72 was studied. MRS medium among several media was selected for enhanced bacteriocin production. The mean growth rate and bacteriocin productivity of L. lactis SA72 increased as the initial pH of the media increases. The highest lacticin SA72 activity was detected 3,200 AU/ml at pH 6.0,
, and 1% (inoculum size, v/v) in the jar fermenter. Enhanced production of lacticin SA72 was investigated by a fed-batch cultivation with the intermittent feeding of the concentrated glucose solution. Under the optimized conditions, lacticin SA72 activity finally reached to 6,400 AU/ml.
Peptide Inhibitors for Angiotensin I Converting Enzyme from Corn Gluten Digests.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 51~56
The angiotensin I converting enzyme (ACE) has an important role in the maintenance of blood pressure. The ACE inhibitory activities of foods have recently been studied. We tried to isolate ACE inhibitory peptides from the Flavourzyme (FZ), Pescalase (PE), and Thermolysine (TH) protease digests of corn gluten, which was restricted to the use the source of food for digestion problem. The FZ, PE, TH/PE protease hydrolyzed corn gluten and the inhibitory activities of the hydrolyzates for ACE were measured. Major fractions were isolated from the digests using ODS chromatography after treating with ethanol in step gradient. The ACE inhibitors were further purified by Bio-Gel P-2 column and reverse phase HPLC. Five inhibitory peptides were isolated. Their amino acids were sequenced as LPF (
M), GPP (
M), PNPY (
M), SPPPFYL (
M), and SQPP (
Optimization of \beta-mammanase Production from Bacillus subtilis JS-1.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 57~62
A bacteria strain producing extracellular
-mannanase was isolated from soil and was identified as Bacillus subtilis by 16S rRNA sequence comparison and biochemical determinations. The optimum pH and temperature for the
-mannanase activity were 5.0 and 5.5
, respectively. The zymogram technique revealed a single protein band exhibiting
-mannanase activity from the culture supernatant. The molecular mass of the enzyme was estimated at approximately 130 kDa. The addition of 0.5% lactose or 0.5% locust bean gum to the LB medium caused to Increase significantly the
-mannanase productivity from Bacillus subtilis JS-1. The cells grown on LB medium supplemented with lactose produced maximal enzyme activity at the stationary phase. In contrast to this, the
-mannanase was induced at the logarithmic phase from the cells grown on LB medium supplemented with locust bean gum. The discrepancy in induction times suggests that
-mannanase was induced by different induction mechanisms depending on the carbon sources in Bacillus subtilis JS-1 .
Effect of NaCl Adaptation on the Thermotolerance and Alcohol Fermentation in Saccharomyces cerevisiae KNU5377.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 63~68
Saccharomyces cerevisiae KNU5377 is a constitutively thermotolerant, fermentative strain at high temperatures over 4
. The exposure to 0.5 M NaCl caused S. cerevisiae KNU5377 to be lost its constitutive thermotolerance. Furthermore, the NaCl adaptation beyond 0.3 M during the overnight culture forced the strain-specific fermentation ability of S. cerevisiae KNU5377 to be disappeared. However, these phenomena did not occur in the reference, Saccharomyces cerevisiae ATCC24858. As a result, this adaptation led both strains to show the closely similar thermotolerance level and alcohol fermentation ability, implying the NaCl adaptation eliminated its strain-specific characteristics of S. cerevisiae KNU5377 Therefore it indicated that the superior intrinsic characteristics of S. cerevisiae KNU5377 must be related to the NaCl adaptation. On the other hand, the heat adaptation elevated alcohol productivity for both strains, but surprisingly did it for KNU5377 at the rate of two times higher than the reference's one; this suggests that KNU5377 possesses more efficient system enough to cause the difference. Consequently, these characteristics of S. cerevisiae KNU5377 must be interesting targets for further study to understand on how KNU5377 could acquire the constitutive thermotolerance and the outstanding fermentative capacity at high temperatures.
Effect of Schizandra chinensis and Pine Meddle on Growth of Pathogens Relate to Acne.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 69~74
Antimicrobial effect of Schizandra chinensis and pine neddle against various pathogens relate to acne (comedones). Ethanol extracts of Schizandra chinensis and pine neddle showed antimicrobial activity against Malassezia furfur Staphylococcus epidermidis and Propionibacterium acnes . The growth of M. fufur and S. epidermidis was inhibited completely by addition of 0.12% Schizandra chinensis extract to YM broth (YM) and tryptic soy broth (TSB) after 24 h incubation. The growth of Propionibacterium acnes was completely inhibited on YM and TSB containing 0.06% of ethanol extract of Schizandra chinensis and pine neddle, respectively. Minimum inhibitory concentration (MIC) of Schizandra chinensis and pine neddle against P. acnes was 0.0075% (75
/mL). The antimicrobial activities of Schizandra chinensis and pine noddle did not decrease apparantly by heat treatment at
for 30 min, 10
for 30 min and
for 15 min, respectively.
Cellular Responses and Morphological Changes of RDX-degrading Bacterium, Pseudomonas sp. HK-6 Exposed by Explosive Hexahydro-1,3,5-triaitro-1,3,5-triazine (RDX).
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 75~82
The cellular responses of RDX-degrading bacterium, Pseudomonas sp. HK-6 to explosive hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) were examined. Strain HK-6 grown at different RDX concentrations was found to demonstrate the survival rate in proportional to the rate of the stress shock proteins produced in this bacterium. Analysis of total cellular fatty acid acids showed that lipids 10:0 iso and 14:1
5t increased approx three times in strain HK-6 grown on RDX media than TSA media. SDS-PAGE and Western blot using anti-DnaK and GroEL revealed that several stress shock proteins including 70 kDa DnaK and 60 kDa CroEL were newly synthesized in strain HK-6 exposed to different RDX concentrations in exponentially growing cultures. 2-D PAGE of soluble protein fractions from the culture of HK-6 exposed to RDX demonstrated that approximately 300 spots were observed on the silver stained gel ranging from pH 3 to pH 10. As a result, 10 spots were significantly induced and expressed in response to RDX. Scanning electron microscopy fur the cells treated with 0.135 mM RDX for 12 hrs showed the presence of perforations and irregular rod shapes with wrinkled surfaces.
Statistical Optimization for Biodegradation of 2,4-Dichlorophenoxyacetic Acid by Soil Isolated Bacterium
Kim, Byunghoon ; Myunghee Han ; Sungyong Cho ; Sungjin Ahn ; Lim, Sung-Paal ; Sunkyun Yoo ;
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 83~89
2,4-Dichlorophenoxyacetic acid (2,4-D) as a widely used herbicide has caused serious environmental problems because of its difficult decomposition in nature. We isolated the strain capable of metabolizing 2,4-D as sole carbon and energy source by an enrichment culture technique from the 2,4-D contaminated soil collected at orchard in Gwangju, Korea. This strain was identified tentatively as Aeromonas sp. NOH2. With this strain, we established the response surface methodology (Box-Behnken Design) to optimize the principle parameters for maximizing biodegradation of 2,4-D such as culture pH, temperature, and nutrient concentration in liquid batch culture. The ranges of parameters were obtained from preliminary works done at our laboratory and chosen as 5.5, 6.5, and 7.5 for pH, 25, 30, and
for temperature, and 5, 20, and 35 g/1 nutrient concentration. Initial concentration of 2,4-D was 500 ppm and nutrient source was tryptic soy broth. The experimental data were significantly fitted to a second order polynomial equation using multiple regression. The most important parameter influencing 2,4-D degradation and biomass production was nutrient concentration. For 2,4-D degradation, the optimum values of pH and temperature, and nutrient concentration were obtained at pH (6.5), temperature (31.8 to
), and nutrient concentration (29.6 to 30.1.0 g/1).
Antimicrobial Activity of Chitosan-alginate-Fe(II) Complex.
Microbiology and Biotechnology Letters, volume 31, issue 1, 2003, Pages 90~93
The antibacterial activity of chitosan-alginate-Fe(II) complex (CAFC) against Escherichia coli and Staphylococcus aureus, and an opportunistic pathogen, Candida albicans, was investigated. A concentration of 1 mg/1 was needed to inhibit the growth of S. aureus and E. coli, while 100 mg/liter was sufficient for the growth inhibition of Candida albicans. The ion leakage of potassium and phosphate from E. coli cell and the penetration of ethidium bromide dye into it indicate that CAFC might be able to increase the cell permeability and consequently cellular leakage, thus leading to cell plasmolysis. Scanning electronmicroscope showed that E. coli cells treated with CAFC became irregular, swelling and expanded. In a field trial, control piglets showed average mortality of up to 60% within 3 days after the onset of diarrhea. In contrast, CAFC-treated groups without mortality was decreased to average 56% on the 1 st day after the treatment, and average 7% on the 3rd day. After then, piglets with diarrhea was not found.