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Algal bioassay 에 의한 조류생장 제한영양염류 결정
오희목(Hee Mock Oh),이석준(Seog June Lee),김성빈(Seong Bin Kim),박미경(Mi Kyung Park),윤병대(Byung Dae Yoon),김도한(Do Han Kim) 한국하천호수학회 1998 생태와 환경 Vol.31 No.2
Determination of Limiting Nutrient for Algal Growth by Algal Bioassay. Oh, Hee-Mock, Seog June Lee, Seong-Bin Kim, Mi- Kyung Park, Byung-Dae Yoon and Do-Han Kim (Environmental Microbiology Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon 305-333, Korea and Water Resources Research Institute, Korea Water Resources Corporation, Taejon 305-390, Korea) Water quaiity and algal growth potential (AGP) using Microcystis aeruginosa were investigated from April to September 1997 in Daechung Reservoir. Secchi disk transparency was 1.1 m in August. Chlorophyll-a concentrations were higher than 10㎍/l at all samples. Total phosphorus concentration was in a range of 0.020∼0.027mg/l which is at the approximate value of 0.03 mg/l, the general critical level of eutrophication. These results indicate that Daechung Reservoir is in an eutrophic state except some temporary times and restricted sites. Phosphorus uptake rate of M. aeruginosa was higher in the water from the epilimnion than in the hypolimnion and also higher under light condition than under dark condition. Therefore, phosphorus uptake rate appears to depend on cellular phosphorous content and light condition, a meaning of endergonic process. Phosphorus was the most frequently limiting nutrient: phosphorus was limiting algal gowth in April and May, nitrogen, phosphorus and trace elements were the limiting factors for algae in August, and trace elements in September. If a fast growing alga, M, aeruginosa, is used as a test organism for assaying AGP, in vivo fluorescence instead of dry weight can be measured for algal biomass and incubation period can be reduced from traditional 14 days to 7 days.
오승민,김기서,유병택,장형석,이희성,정규혁 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.4
This study was designed to investigate potential endocrine disrupting effects of several industrial wastewater effluents discharged from cosmetic, plaiting, paint, textile industry using EROD bioassay and E-Screen assay The results of E-screen assay showed that textile industrial wastewater could act as a full agonist and cosmetics and plaiting industrial wastewater could act as a partial agonist On the contrary, the wastewater discharged from paint industry did not show any estrogenic effect Estrogenic activity in the effluents of cosmetic and paint industrial wastewater was lower than that in the influents indicating that the wastewater treatment process minimized the effects of discharges on water quality Despite of these results, it was recognized that wastewater treatment was not always minimize toxic impact In this study, increased estrogenic effect was observed in the effluents of plating and textile wastewater, and EROD activity was increased in the effluents of cosmetic and plating wastewater.
Direct Colorimetric Assay of Microcystin Using Protein Phosphatase
Oh, Hee-Mock,Lee, Seog-June,Kim, Jee-Hwan,Park, Chan-Sun,Yoon, Byung-Dae The Korean Society for Biotechnology and Bioengine 2000 Biotechnology and Bioprocess Engineering Vol.5 No.6
A new direct colorimetric assay of microcystin in water and algal samples is proposed consisting of two procedures as follows: 1) the elimination of phosphorus in the sample and concentration of microcystin using a C(sub)18 cartridge, 2) the detection of the released phosphorus by the ascorbic acid method and determination of protein phosphatase (PP) inhibition by microcystin. The optimum amounts of phosphorylase ${\alpha}$ and PP-1 in 50 ${\mu}$L concentrated sample were 50$\mu\textrm{g}$/50${\mu}$L buffer and 1.0unit/50${\mu}$L buffer, respectively, for the best assay. The pH for the maximum activity of PP-1 was 8. The minimum detectable concentration for this method was about 0.02$\mu\textrm{g}$/L, which is sufficient to meet the proposed guideline level of 1$\mu\textrm{g}$ microcystin/L in drinking water. Consequently, it would seem that the proposed direct colorimetric assay using PP is a rapid, easy, and convenient method for the detection of microcystin in water and algal samples.
Park, Seog Yun,Chang, Hee Jin,Kim, Dae Yong,Jung, Kyung Hae,Kim, Sun Young,Park, Ji Won,Oh, Jae Hwan,Lim, Seok‐,Byung,Choi, Hyo Seong,Jeong, Seung‐,Yong Blackwell Publishing Ltd 2011 Histopathology Vol.59 No.4
<P>Park S Y, Chang H J, Kim D Y, Jung K H, Kim S Y, Park J W, Oh J H, Lim S‐B, Choi H S & Jeong S‐Y (2011) <I>Histopathology</I><B>59</B>, 650–659</P><P><B>Is step section necessary for determination of complete pathological response in rectal cancer patients treated with preoperative chemoradiotherapy?</B></P><P><B>Aims: </B> To assess the efficacy of the step section for determination of pathological complete response (pCR) in rectal cancer treated with preoperative chemoradiotherapy (CRT).</P><P><B>Methods and results: </B> Of 709 patients with rectal cancer who received preoperative CRT, 88 were initially diagnosed as having pCR. These 88 patients were re‐evaluated after two‐level step sections of the entire tumour by using Dworak’s regression grade. Additional serial step sections revealed residual tumour cells in seven of 88 patients (7.95%), all of whom were upgraded to regression grade 3 (near total regression) from regression grade 4 (total regression). Of these seven patients, one (14.3%) showed tumour recurrence, compared with 11 of 81 (13.6%) patients with a final regression grade of 4. Neither recurrence rate nor disease‐free survival rate differed significantly between these two groups (<I>P </I>><I> </I>0.5). Calcification was significantly more frequent in grade 3 than in grade four patients (71.4% versus 32.1%; <I>P </I>=<I> </I>0.037), and acellular mucin pools were associated with better disease‐free survival (<I>P </I>=<I> </I>0.022).</P><P><B>Conclusions: </B> Stratifying patient outcome by final regression grade after step section did not yield different outcomes in patients with initial pCR. If residual tumour cells are not identified on initial meticulous examination, further processing of step sections is not necessary.</P>
윤병대,이승규,오희목,이석준,이욱재,최롱 한국육수학회 2000 생태와 환경 Vol.33 No.2
부영양 상태의 연못에서 채취한 시료수에 규산질다공체(CellCaSi)를 첨가한 후 미세조류의 제거효과에 대하여 조사하였다. 규산질다공체는 입도의 크기(1, 2, 그리고 4mm 이하)및 첨가량(0,1,5, 그리고 10g/l)에 따라서 수질에 미치는 영향을 조사하였다. 엽록소-a 농도는 1mm 이하의 규산질다공체를 10g/l로 첨가한 경우 처리 3일에 79%의 제거효율을 나타내었다. 즉, 규산질다공체의 조류제거 효과는 입자의 크기가 작을수록, 첨가량이 많을수록 효과가 높았다. 규산질다공체 첨가구의 우점조류종은 Chlorella ellipsoidea로 대조구와 차이가 없으나, 출현 조류종 및 현존량은 감소하였다. 규산질다공체의 첨가에 의하여 총질소 함량은 영향을 받지 않았으나, 총인 함량은 다소 감소하는 경향을 나타내었다. 규산질다공체의 첨가로 인하여 pH와 turbidity는 크게 영향을 받지 않았으나, conductivity는 첨가량에 따라 비례적으로 증가하는 경향을 보였다. 따라서, 대부분의 원수 및 음용수에 있어서 전기전도도의 상한값으로 알려진 500㎛hos/cm를 유지하기 위해서 규산질다공체의 첨가량은 6.6g/I 이하로 제한하는 것이 바람직하다고 판단된다.