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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,안태석,양상용,유홍일,유재근 ( Seung Ik Choi,Tae Seok Ahn,Sang Yong Yang,Hong Il Rhu,Jae Keun Ryu ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.2
To define the effects of fish(Hypophihalmichthys molltrix) predation on phytoplankton densities and activities of extracellular enzymes including phosphatase, cellobiohydrolase and β-glucosidase were weekly investigated both in fish and control aquariums. Eventhough there was no increment of nutrients by fish predation, chl. a concentration in the fish aquarium was 12.6mg m^-3, twice higher than in the control, and total bacterial number(AODC) was 1.1x10^7cells ml^-1, 5 times higher than control aquarium after 25 days. The V_(max) and K_m values of extracellular enzyme activities were higher in the fish aquarium. Especially, the V_(max) of β-glucosidase in the fish aquarium was 7 times higher than in the control. These results suggest that the predation and digestion of Hypophihalmichthys molltrix should cause the diversification of substrates of extracellular enzymes and stimulate nutrient cycles and degradation of organic materials.
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.
소양호에서 섬유소 기질에 부착한 미생물의 유기물 분해 활성도
최승익,안태석 ( Seung Ik Choi,Tae Seok Ahn ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.1
In order to define the composition of dissolved organic materials(DOM) in the Lake Soyang, the cellobiohydrolase and, the β-glucosidase activity of attached bacteria on cellulose films submerged in various depths for 40-50 days were investigated. The numbers of the attached bacteria varied from 0.5×10^6 to 8.4×10^6 cells cm^-2, and the seasonal variation was more dramatic in epilimnion than in hypolimnion. The ranges of cellobiohydrolase and β-glucosidase activities were from 0.1 to 1396.5nM l^-1hr^-1 and from 0.2 to 2194.8nM l^-1hr^-1, respectively. Maximum activity of these two factors was recorded in winter. The specific activity of β-glucosidase was relatively higher during fall and winter compared to that of early spring. This results may indicate that the major component of DOM after the phytoplankton bloom is high molecular weight organic materials. But in early spring and summer, the DOM is low molecular weight organic materials.
비점오염원으로부터 오염된 하천수에서 식물플랑크톤 배양을 이용한 영양염류 제거
조안나 ( Ahn Na Cho ),정다운 ( Da Woon Jung ),정유정 ( You Jung Jung ),최승익 ( Seung Ik Choi ),안태석 ( Tae Seok Ahn ) 한국하천호수학회(구 한국육수학회) 2009 생태와 환경 Vol.42 No.2
비점오염원으로부터 오염된 소하천에서 영양염류를 제거하기 위하여 식물플랑크톤 배양 장치를 설치하고 운영하였다. 식물플랑크톤 배양조에서 식물플랑크톤 정치배양 결과, 식물플랑크톤의 연속배양을 위한 배양조의 체류시간을 3일로 결정하였으며 TP는 70%, TN은 44%가 제거됨을 확인하였다. 연속배양 결과 45일 동안 배양조에 유입된 TP의 53.9%, TN의 53.1%가 식물플랑크톤에 의한 흡수와 슬러지로 제거되었다. 식물플랑크톤이 성장하면서 배양조의 pH와 용존산소농도는 각각 평균 10.8, 16 mg L-1이었다. 결국 비점오염원에 오염된 하천수의 영양염류는 식물플랑크톤의 사체와 화학반응으로 생성된 침전물로 제거되었다. 비교적 설치가 간단하고 경제성이 높은 식물플랑크톤 배양법의 높은 현장적용 가능성을 확인하였다. A phytoplankton cultivation system was installed and operated for removal of nutrients from stream water polluted by nonpoint source pollution. The system was a continuous-flow culture comprising a phytoplankton tank that received inflow from a storage reservoir. When the system was operated as a batch culture for the purpose of determining hydraulic retention time (HRT), the proper HRT value was three days, and the removal rate of TP and TN averaged 70% and 44%, respectively. When the system was operated with the continuous flow from a stream for 45 days, 53.9% of TP and 53.1% of TN were removed as sludge. Due to active growth of phytoplankton, pH and dissolved oxygen in the phytoplankton tank were extremely high, reaching 10.8 and 16 mg L-1, respectively. It was concluded that nutrients can be effectively removed from polluted stream waters by cultivating phytoplankton.
수생관속 식물이 우점하는 연못에서의 B - glucosidase 활성도 변화
안태석,정미정,최승익 ( Tae Seok Ahn,Mi Jeong Jeong,Seung Ik Choi ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.4
For determing the ecological roles of free-living bacteria and epiphytic bacteria on marophytes (Acorus calamus, Nymphaea tetragona, Nymphoides indica), the β-glucosidase activities of free-living and attached bacteria were investigated at two ponds weekly from May, 1995 to August, 1995. The β-glucosidase activities of pond water of Yeonjeokji and Sesimjeong were ranged 35∼1073 nmol 1^-1 hr^-1 and 30∼898 nmol 1^-1 hr^-1, respectively. At Yeonjeokji, where the phytoplankton was abundance, the variations of β-glucosidase activity correlated with the chlorophyll a concentration, while at the Sesimjeong, where the macrophyte was abundance, the correlation between activity and chlorophyll a concentration was not appeared. The areal activity of A. calamus, N. tetragona, N. indica were varied 16∼437, 223∼149537 and 19∼2396 nM cm^-2 hr^-1, respectively. The lowest areal peaks of activities of three macrophytes were appeared during the flowering period. At Yeonjeokji, the specific activity of epiphytic bacteria on N. tetragona was higher than that of free-living bacteria during the late spring, but it was lower during the summer. In other hand, the specific activity of epiphytic bacteria on N. indica, was 200∼500 times higher than that of free-living bacteria. At Sesimjeong, variation of the specific activity of epiphytic bacteria on A. calamus was similar to that of free-living bacteria. These results suggest that bacterial mineralization rates are affected by the kind of macrophytes, their physicological state and limnological characteritics.