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최승익,안태석 한국미생물학회 1997 미생물학회지 Vol.33 No.1
이 글에서는 호수생태계에서 일어나는 변화 중 .betha.-glucosidase 활성도를 중심으로 생화학적인 분석과정을 통하여 유기물질의 분해, 생성, 소비등에 대한 과정을 설명하고자 한다. .betha.-glucosidase효소는 비교적 기질특이성이 넓고, glucose, celluhexose, carboxy-methylcellulose등의 .betha.고리를 가수분해시켜 monomer로 분해시키는 효소로서 수환경에서는 매우 중요하다. 즉 cellobiohydrolase에 의해 분해된 oligomer나 dimer를 세균의 세포막을 통과할 수 있는 크기로 분해시키는 효소이고, 이 효소의 분해 산물인 포도당은 세균에 의하여 바로 이용되고, catabolite inhibitor로 작용하므로, 이 효소 활성도의 높고 낮음은 수중생태계에서 탄소의 흐름과 세균 군집의 성장을 이해하는데 매우 중요하다(3).
최승익,변명섭,안태석 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
The total bacterial numbers were estimated by acridine orange direct count method in Lake Soyang monthly from January 1990 to 1992 The range of total bacterial number was from 0.4*10^(6) to 4.7*10^(6) cell*㎖^(-1). In epilimnion,the variation range was wider than other depths. while in hypolimnion was narrower. At August, when water temperature was highest. the bacterial numbers was also highest . This means that water temperature was highest the bacterial numbers was also highest. This means that water temperature was one of the factor governing the bacterial abundance. In metalimnion. the bacterial number was higher than other depths during stratigication. And spacially the bacterial numbers near aquaclture net-cages were higher than those of dam site. This means that allochthonous materials such as terrestorial originated particle, organics and microbes from watershed and fish feed stinmulated the bacterial growth.
최승익,김범철,안태석 ( Seung Ik Choi,Bomchul Kim,Tae Seok Ahn ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.2
To scutinize the effects of acidification on bacterial community, bacterial numbers and β-glucosidase activities were analyzed within the acid-treated lake water. One liter of 0.2㎛ filtrated water of Lake Soyang were adjusted as pH 3.7, 5.0, 6.1 with 1N H-2SO_4 and inoculated to ml of Lake water. In case of pH 6.1, after incubating for 10 hrs, bacterial numbers and activities were similar to those of control. But in case pH 5.0, after incubating for 72 hrs, bacterial numbers and activities were higher than other cases. In low pH condition, pH 3.7, the bacterial community have not recovered their numbers and activities. Specific activity of β-glucosidase in pH 5.0 condition was the highest.
최승익,변명섭,안태석 ( Seung Ik Choi,Myeong Seop Byeon,Tae Seok Ahn ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
The total bacterial numbers were estimated by acridine orange direct count method in Lake Soyang monthly from January, 1990 to December. 1992. The range of total bacterial number was from 0.4×10^6 to 4.7×10^6 cells ·ml^-1. In epilimnion, the variation range was wider than other depths, while in hypolimnion was narrower. At August, when water temperature was highest, the bacterial numbers was also highest. This means that water temperature was one of the factor governing the bacterial abundance. In metalimnion, the bacterial number was higher than other depths during stratification. And spacially, the bacterial numbers near aquaculture net-cages were higher than those of dam site. This means that allochthonous materials such as terrestorial originated particles, organics and microbes from watershed and fish feed stimulated the bacterial growth.