Khan, Shehzad Abid;Kim, Hyung Min;Baek, Ju Hye;Jung, Hye Su;Jeon, Che Ok
Journal of Microbiology and Biotechnology
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v.31
no.9
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pp.1210-1217
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2021
Two gram-negative, catalase-positive, strictly aerobic, and white colony-forming bacteria, strains H242T and B156T, were isolated from soil in South Korea. Cells of strain H242T were oxidase-positive and non-motile short rods, while those of strain B156T were oxidase-negative and long non-motile rods. Ubiquinone-8 was identified as the sole isoprenoid quinone in both strains. C16:0, cyclo-C17:0, andsummed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol were identified in both strains as the major cellular fatty acids and polar lipids, respectively. The DNA G+C contents of strains H242T and B156T were 69.4 mol% and 69.3 mol%, respectively. Phylogenetic analyses based on 16S rRNA and 92 concatenated core gene sequences revealed that strains H242T and B156T formed distinct phylogenic lineages from other Ramlibacter type strains. The DNA-DNA hybridization (DDH) value between strains H242T and B156T was 24.6%. Strains H242T and B156T were most closely related to Ramlibacter ginsenosidimutans BXN5-27T and Ramlibacter monticola G-3-2T with 98.4% and 98.6% 16S rRNA gene sequence similarities, respectively. Digital DDH values between strain H242T and R. ginsenosidimutans and between strain B156T and R. monticola were 23.5% and 26.1%, respectively. Phenotypic, chemotaxonomic, and molecular analyses indicated that strains H242T and B156T represent two novel species of the genus Ramlibacter, for which the names Ramlibacter terrae sp. nov. and Ramlibacter montanisoli sp. nov., respectively, are proposed. The type strains of R. terrae and R. montanisoli are H242T (=KACC 21667T=JCM 33922T) and B156T (=KACC 21665T=JCM 33920T), respectively.
Kim, Dong-Gyun;Jung, Hyun-Kyoung;Kim, Young-Ok;Kong, Hee Jeong;Nam, Bo-Hye;Kim, Ju-Won;Kim, Young-Sam
Korean Journal of Fisheries and Aquatic Sciences
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v.55
no.5
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pp.612-624
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2022
A novel Gram-positive, motile, non-spore forming aerobic marine bacterium, designated 107-1T was isolated from tidal mud collected in Gyehwa-do, South Korea. Cells of strain 107-1T were short rod or coccoid, oxidase negative, catalase positive and grew at 10-40℃ (with optimum growth at 25-30℃). It utilized menaquinones MK-7 and 8 as its respiratory quinones and its major fatty acids were anteiso-C15:0 (37.9%), iso-C16:0 (14.9%), and iso-C14:0 (10.8%). Phylogenetic analysis based on 16S rRNA gene sequences revealed a distinct clade containing strain 107-1T and close species Planococcus ruber CW1T(98.52% sequence similarity), P. faecalis KCTC 33580T(97.67%), P. kocurii ATCC 43650T(97.48%), P. donghaensis DSM 22276T(97.47%), and P. halocryophilus DSM 24743T(97.37%). Strain 107-1T contains one circular chromosome (3,513,248bp in length) with G+C content of 44.6 mol%. Estimated ranges for genome to genome distance, average nucleotide identity, and average amino acid identity comparing strain 107-1T with close taxa were 20.3-34.8%, 77.9-86.9%, and 73.6-92.8%, respectively. Based on polyphasic analysis, strain 107-1T represents a novel species belonging to the genus Planococcus.
Eighty one products from 36 kinds of vitamin and mineral feed supplement collected during August, 1984 to February, 1985 were examined for microbiological contamination. In addition, 83 strains of coliform isolated from the samples were tested for the resistance to 8 kinds of antimicrobial drugs and distribution of R plasmid. General bacteria were detected in all of samples tested. Bacterial population was varied from less than 10 per gram of the sample to 1,400,000 per gram and 34 (42%) of 81 samples were contaminated with 100 to 1,000 cells per gram. Coliform isolation, which was more frequent in samples with larger number of general bacteria, was possible in 14 (17.3%) out of 81 samples tested and 6 (33.3%) out of 18 companies were coliform positive in their products. Forty one (49.4%) out of 83 coliform isolates were fecal coliform. The frequency of resistant strains was the highest to sulfadimethoxine (Sa) with 92.8% and followed by streptomycin (Sm, 67.5%), tetracycline (Tc, 50.6%), kanamycin (Km, 26.5%), chloramphenicol (Cm, 18.1%) and ampicillin (Am, 15.7%). No strain was resistant to nalidixic acid (Na) and gentamicin (Gm). The resistance frequency of fecal coliform strains were higher compare to non-fecal coliform strains. There were minimum inhibitory concentration (MIC) of $3,200{\mu}g/m{\ell}$ or higher in 7 strains to Am, 3 to Sm and 3 to Km, and 70 strains had MIC of $1,600{\mu}g/m{\ell}$ of higher to Sa while Tc had MICs from $1.6{\mu}g/m{\ell}$ to $400{\mu}g/m{\ell}$. All strains had MICs of $6.3{\mu}g/m{\ell}$ of lower to Na and $3.1{\mu}g/m{\ell}$ of lower to Gm. Seventy nine (95.2%) of 83 strains were resistant to one or more drugs tested. The most frequent resistance patterns were SaSm (14.5%) and followed by SaSmTc(12%), SaSmTcKm(8.4%) SaTc (8.4%) and SaSmKm (7.2%) ; total 19 different patterns were noted. Thirty two (40.5%) of 79 resistant strains were transferred all of a part of their resistance to Escherichia coli ML 1410. The frequency of transferable resistance was high in Am (100%) and Cm (80%) while low in Tc (38.1%), Sa (18.2%), Sm (17.9%) and Km (4.5%).
This study was carried out to isolate some bacterial strains which had potentiality of good degrader of fungicides from herbicide free soil and to clarify degradation of a fungicide mycrobutanyl[2-p-chlorophenyl-2-(1H-1,2,4-triazole-1-ylmethyl)-hexanenitrile]. Ten strains of the gram-positive and the gram-negative bacteria were isolated and identified. Most of them vigorously proliferated at 55ppm of mycrobutanil, but the stains were not grown when more than 70ppm of this fungicide were treated Staphylococcus spp. I, Actinobacillus spp. III, and another I of the isolated bacteria degraded more than 35% of the treated mycrobutanil. These three strains could utilize mycrobutanil as nitrogen and carbon sources. Mycrobutanil was rapidly decomposed by these strains when applied once or three times. Tested bacteria gradually increased in growth when mycrobutanil was applied repeatedly. Degradation of mycrobutanil and growth of these bacteria were greater in pH 5.5, and they were high in the order of $28^{\circ}C$ > $18^{\circ}C$ > $38^{\circ}C$.
Park, Gyu-Hwan;Baek, In Youl;Han, Won Young;Kang, Sung Taek;Choung, Myoung Gun;Ko, Jong Min
KOREAN JOURNAL OF CROP SCIENCE
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v.58
no.4
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pp.383-387
/
2013
This study was carried out to examine whether the leaf size is likely to be used as a selection criterion for large seed genotype in soybean (Glycine. max (L.) Merr.) breeding program. Two hundred twenty nine soybean germplasms which had collected in Korea, United States, China and Japan were used in this experiment. The area of unifoliate leaf, middle leaflet of first trifoliate and third trifoliate leaf ranged from $3.2cm^2$ to $33.8cm^2$, 9.2 to $29.5cm^2$, and 7.2 to $58.9cm^2$, respectively. One hundred seed weight also showed great variation from 2.7 to 39.0 gram. The average leaf area of unifoliate, middle leaflet of first trifoliate and third trifoliate leaf were $15.7cm^2$, $18.1cm^2$ and $32.7cm^2$, respectively, and that of seed average weight was 17.2 gram per one hundred seed. Significantly positive correlations were observed between seed weight and leaf area of unifoliate (r=$0.80^{**}$), first trifoliate (r=$0.75^{**}$) and third trifoliate (r=$0.67^{**}$), respectively. Both the leaf length and leaf width of unifoliate, middle leaflet of first trifoliate and third trifoliate leaf were significantly positively correlated with seed weight and both the correlations of unifoliate were higher than the other leaves. The correlations of leaf width in soybean leaflet were higher than those of leaf length. Leaf length/width (L/W) ratio of upper leaf was higher than that of lower leaf in the leaf size. Both the leaf area and leaf width of unifoliate leaf are the most suitable predictive characteristics of early selection in related to seed weight for soybean breeding program.
This research was performed to investigate the possibilities of industrial usage of camellia (Camellia japonica L.) by examining the antioxidant and antimicrobial effects of methanol extract with different sections. Content of total phenolics, DPPH radical scavenging activities and antibacterial activity of young leaf, mature leaf, flower bud, flower, bark, and seed of camellia were compared in vitro experimental models. Total phenolics was contained the higher in young leaf (74.62 mg), flower bud (65.02 mg) and flower (62.42 mg) but less than 20.95 mg per 100 g of dry weight in other parts of Camellia japonica L. And effects of antioxidant measured by DPPH radical scavenger activity ($RC_{50}$, reduce concentration 50%), was shown higher $7.16{\sim}18.14\;{\mu}g/m{\ell}$ in methanol extract of young leaf, flower bud and flower than $61.23\;{\mu}g/m{\ell}$ of BHT as a chemical oxidant. Also, the antimicrobial activity of Camellia japonica L. extracts determined using a paper disc method against food-borne pathogen and food spoilage bacteria, the young leaves extracts showed the most active antimicrobial activity against 7 kinds of harmful microorganisms. Flower bud extracts showed the highest antibacterial activity against P. aeruginosa and Enterobacter spp. C1036. In addition, the minimum inhibitory concentration (MIC) of young leaf extract against B. subtillis,S. fradiae,S. aureus,E. coli,P. aeruginosa, Enterobacter spp. C1036, and S. typhimurium were revealed 1 to 15 ${\mu}g/m{\ell}$. As a result, antimicrobial activity of camellia extracts was shown higher gram positive bacteria than gram negative bacteria.
This study was carried out to investigate the effect on the system of crop rotation of sesame(Sesamum indicum L). The results of infected plant percentage and yield of sesame wilting disease, fluctuation of density of Fusarium oxysporum and Actinomycetes, and their pathogenicity test on Fusarium spp isolated from sesame cultural soil were investigated. Density of F. oxysporum was the highest in a sesame continuous cropping soil but that of Actinomycetes was the lowest in that soil. And that of F. oxysporum and Actinomycetes according to investigation date was the highest at June. 30 and July. 30, respectively. Their pathogenicity of F. oxysporum and F. solani isolated from sesame cultural soil to sesame, peanut and green gram were recognized to all isolates except one isolate among F. oxysporum 8 isolates and one isolate to sesame, 2 isolates to peanut and all isolates to green gram among F. solani 4 isolates. F. oxysporum density and infected plant of wilting disease were increased as a result of replanted cultivation of sesame, and yield of that was prominantly reduced. Relation between density of F. oxysporum in cultural soil and infected plant percentage showed positive correlation and yield index highly negative. There was little difference between sesame-upland rice and sesame-peanut in the system of crop rotation.
A series of field and laboratory experimentes were conducted to find out the effects of kinds of crops residues and the different amount of fertilizer to the microbial interaction, chemical properties, plant growth and their interaction under continous cultivation of hot pepper, soybean, sesame and upland rice. The results obtained were summerized follows : 1. Total number of bacteria and actinomycetes were enhanced by cultivation of upland rice and soybean while no appreciable effects were obtained by the cultivation of hot pepper and sesame. 2. The number of bacteria, actinomycetes and fungi were increased by return of crop residues when the cultivation of hot pepper, soybean, sesame and upland rice. Specially, actinomycetes was remarkably increased by upland rice cultivation. 3. Increased amount of fertilizer were remarkably affected to decrease of number of soil microorganisms. Specially, actinomycetes succession was appearently affects while plant growing time. 4. The number of identified soil bacterial species were obtained high in order of Bacillus sp.>Rhizobium sp.>Agrobacterium sp.>Pseudomonas sp. The number of Gram positive bacteria were superior than that of Gram negative bateria. 5. Interaction between microbial succession and crops cultivation, the number of Bacillus sp. was increased in hot pepper, Rhizobium sp. was in soybean, and sesame, and Agrobacterium sp. were increased in soybean, respectively. 6. Survival and habitate of soil microorganisms were differ with kinds of crop, application of residue and fertilizers. Most high number of Bacillus sp. Rhizobium sp. and Pseudomonas sp. were obtained on the rhizoplane and rhizosphere while Agrobacterium sp. and Fusarium sp. were high in rhizosphere. 7. Factors in relation to change of soil microbial population was obtained high in order of climates>crops>organic>matter>fertilizer.
Radish (Raphanus sativus) is a common cruciferous vegetable, and its aerial parts, called Mu-chung in Korean, have plentiful nutritional components such as vitamins, minerals and dietary fibers. Mu-chung has been used as a kimchi, a traditional Korean fermented dish, and dried Mu-chung is an important component of soups commonly consumed during winter in Korea. Since the advent of the mass production of radish in Korea, with the segregation of farm areas and towns and changing diets, Mu-chung has mostly been discarded instead of utilized. In addition, studies concerning the efficient utilization and useful bioactivities of Mu-chung are still lacking worldwide. In this study, we prepared the ethanol extract of Mu-chung and its subsequent solvent fractions. Antimicrobial, antioxidation, and anticoagulation activities were then evaluated in the hopes of developing a functional biomaterial from Korean radishes' aerial parts. The ethanol extraction yield for hot-air dried Mu-chung was 5.6%, and the fraction yields of n-hexane (H), ethylacetate (EA), butanol (B) and water residue were 25.3, 3.6, 19.4, and 51.7%, respectively. Analysis of total polyphenol and total flavonoid contents showed that the EA fraction had the highest content (97.57 and 152.91 mg/g) amongst the fractions. In antimicrobial activity assays, the H and EA fractions were effective against gram positive bacteria (Staphylococcus aureus, Listeria monocytogenes, and Bacillus subtilis), but not effective against gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa). The B fraction also exhibited moderate antibacterial activity, suggesting that the extract of Mu-chung has various antibacterial components. In antioxidation activity assays, the EA fraction showed strong DPPH, ABTS and nitrite scavenging activities ($69-222{\mu}g/ml$ of $IC_{50}$), including reducing power. In anticoagulation activity assays, the EA fraction demonstrated strong inhibition activity against human thrombin and prothrombin. Prominent anticoagulation activity was found in aPTT assays; the aPTT of the EA fraction was extended 15-fold compared than that of the solvent control. Our results suggest that Mu-chung is an attractive nutritional food material possessing useful bioactivities, and the EA fraction of Mu-chung could be developed as a functional food ingredient.
Kim, Man-Chul;Jang, Tae-Won;Harikrishnan, Ramasamy;Moon, Young-Gun;Song, Chang-Young;Kim, Gi-Young;Heo, Moon-Soo
Journal of Life Science
/
v.19
no.3
/
pp.366-372
/
2009
In the course of screening of useful enzyme-producing microorganisms from marine sedimentary layers, we isolated 2 amylase producing strains and tested their amylase producing activities. Analyses of 16S rDNA sequences and biochemical methods (BIOLOG) of two isolates showed that they were confirmed to be a gram positive Bacillus sp. and gram negative Pseudoalteromonas sp., respectively. Excellent amylase producing strains were termed Bacillus sp. ST-63 and Pseudoalteromonas sp. ST-140, and further studies were conducted on their amylase producing characteristics. Optimum conditions for cell growth in amylase activity were obtained when the isolate (Bacillus sp. ST-63 and Pseudoalteromonas sp. ST-140) was cultured at $30^{\circ}C$ and pH $7{\sim}8$.
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