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권개경,오지혜,양성현,박미정,이연주 한국미생물학회 2022 미생물학회지 Vol.58 No.4
A Gram-negative, facultatively anaerobic, rod-shaped (1.4 ± 0.46 μm × 0.53 ± 0.17 μm) and motile marine bacterium designated as MEBiC11861T was isolated from a marine algal debris collected from Kosrae, Federation State of Micronesia (162°57’23.1"E, 5°21’13.0"N). Based on the 16S rRNA gene sequence analysis strain MEBiC11861T identified as a novel species in the genus Nisaea, it showed high similarity to members of the genus Nisaea (97.0–98.4%). Strain MEBiC11861T was growing at 10–42℃ (optimum 26–29℃), at pH 4.0–8.5 (optimum pH 5.0) and with 0–10% (optimum 0.5%) NaCl. The C12:0 (5.6%), C16:0 (29.0%), C12:0 3-OH (4.3%), summed feature 3 (C16:1 ω7c and/or C16:1 ω6c; 9.9%), summed feature 8 (C18:1 ω 7c and/or C18:1 ω6c; 31.2%), and C19:0 cyclo ω8c (10.6%) were determined to be as predominant cellular fatty acids. The DNA G + C content is 63.0 mol%. The major respiratory quinone is Q-10. Several phenotypic characteristics such as utilization of gluconate, malate, adipate, arabinose etc., DNA G + C ratio, cellular fatty acids composition, and growth range of pH and salinity differentiate strain MEBiC11861T from members of the genus Nisaea. On the basis of this polyphasic taxonomic data, strain MEBiC11861T should be classified as a novel species in the genus Nisaea and it is proposed as Nisaea acidiphila sp. nov. The type strain is MEBiC11861T (= KCCM 43219T = JCM 31589T). Emended description of the genus Nisaea Urios et al. 2008 and emendation of Thalassobaculum salexigens were also given.
권개경,제종길 한국해양과학기술원 2002 Ocean and Polar Research Vol.24 No.1
To evaluate the effect of reed population on the distribution and activities of microorganisms, vertical distribution of heterotrophic bacteria, degradation rate of cellulose, extracellular aminopeptidase activity (APA) and metabolic diversity based on GN2 Microlog plate were measured at two salt marsh stations in Hogok-ri, Namyang Bay, west coast of Korea. The number of heterotrophic bacteria at station 1 (reed population inhabited area) showed 2 to 6 times higher than that of station 2 (exposed area) with exception in the surface layer. Cellulose degradation rates in station 1 showed more than 50 %month1 and higher than that of station 2 (10.2 to 38.4 %·month1). Yet the APA at two stations did not show difference except surface layer and suggested that APA might not be a significant factor in degrading marsh plant debris. Lipid class compounds, cell wall polymers and L-alanine were widely used by microorganisms. The number and activities of bacterial populations especially concerned in plant debris degradation seemed to be stimulated by the reed communities.
권개경,이홍금,제종길 한국습지학회 2005 한국습지학회지 Vol.7 No.2
갯벌환경에 대한 이해의 증진과 가치산정에 필요한 자료 생산의 측면에서 강화도 남단의 모래갯벌과 펄갯벌의 세균수와 활성의 수직분포를 비교하였다. 평균적으로 펄갯벌의 세균수와 활성이 모래갯벌에 비해 더 높은 값을 보였다. 모래갯벌의 세균수는 조사기간동안 펄갯벌과 비슷한 수준으로 증가하였는데 이는 펄성분의 증가에 따른 환경조건의 변화가 원인인 것으로 생각된다. 강화도 펄갯벌의 세균수와 활성은 맹그로브지역에 버금가는 높은 수준이었으며 모래갯벌의 세균수와 활성도 외국의 갯벌에 비교해서는 높은 수준을 보였다. 세균수는 퇴적토의 깊이에 따른 차이가 명확하지 않았으나 효소활성, 세균생산력은 깊이 3∼5 ㎝이내에서 급격히 감소하였다. 이는 퇴적토 깊이의 증가에 따라 수분함량이 감소하며 용존상태로 공급되는 유기물의 양도 감소하는 것이 원인인 것으로 생각된다. 한편, 펄갯벌의 세균수와 활성이 미소 일차생산자의 분포와 큰 상관관계를 보이지 않은 반면 모래갯벌에서는 미소 일차생산자의 분포가 세균수와 활성을 조절하는 요인인 것으로 나타났는데 이는 펄갯벌의 경우 주변에 서식하는 칠면초군락으로부터 공급되는 유기물의 영향을 받기 때문인 것으로 사료된다.
권개경(Kae Kyoung Kwon),이순재(Soon Jae Lee),박재현(Jae Hyun Park),이유경(Yoo Kyung Lee),조경희(Kyeung Hee Cho),이홍금(Hong Kum Lee) 한국해양환경·에너지학회 2004 한국해양환경·에너지학회 학술대회논문집 Vol.2004 No.-
Biofilm is a starting point of biofouling and biocorrosion. However there was not enough informations about the biofilm forming bacteria in marine environments. In the present study, phylogenetic position and bacterial properties thought to be concerned in biofilm formation such as cell surface hydrophobicity, attachment on surface, production of quorum sensing (QS) signal molecule etc. were investigated for 76 isolates of 3 days old biofilm. Based on the partial sequences of 16S rDNA, the isolates could be assigned to 30 known genera which have been reported as widespread in marine environment. Approximately 31% of the isolates had been reported previously as uncultured or unidentified in GenBank database. Cell surface hydrophobicity and attachment ability were usually incompatible in a same strain except two strains. Among the 39 strains producing Acyl-Homoserine Lactone (AHL), 21 strains could degrade AHL molecules. Among the isolates, high values of cell surface hydrophobicity were found in the strains belong to high GC gram positive group and attachment ability was relatively high in low GC gram positive bacteria. To the contrary, average value of EPS productivity was highest in γ-Proteobacteria These results implied that the role of bacterial strains in the process of biofilm formation is closely related to the phylogenetic position.