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- 저자 : 장동석 ( Seung Tae Choi (검색결과 4 건)
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최승태 ( Seung Tae Choi ),박미연 ( Mi Yeon Park ),장동석 ( Dong Suck Chang ) 한국수산학회 1995 한국수산과학회지 Vol.28 No.4
생선 횟집의 활어용 수조수에 대한 위생 대책 수립의 일환으로 자외선을 이용한 제균 효과를 검토하였다. 1. 물 두께 10mm(유수량; 730ml/sec, 등; 5조, 통과 시간; 2.4초)와 자외선 조사량 75W의 조건에서 자외선등 통과 직후의 해수에서의 생균수 감소율은 평균 85.0%였다. 2. 장염 비브리오균의 경우, 자외선 조사 후 1시간만에 3 log cycle 감소하였으며, 그 이후 큰 변화가 없었다. 3. 한편 쥐치에 같은 조건으로 72시간 처리했을 때 내장 세균의 감소는 거의 없었으나, 돌돔 및 쥐치의 표피와 아가미에서의 생균수 감소율은 약 2 log cycle이었다. 4. 패류의 여수율을 좋게 하기 위하여 수조수의 온도를 20~23℃로 조절한 수조에서 홍합과 굴을 같은 조건으로 처리했을 때 24시간 후에 생균수의 감소율은 홍합과 굴에서 각각 2 log cycle 정도였으며, 분변계 대장균의 경우는 각각 3 log cycle, 1.5 log cycle정도 감소하였다. The purpose of this study is to develop a sanitary aquarium for the safety slices of raw fish by using U.V. light. Water re-circulating system was composed of two tanks. One of the tanks (90×45×45cm in size) was used for rearing fish and the other (90×45×45cm in size) with 37 pieces of corrugated plastic plates was used for the growth of Nitrosomonas and Nitrobacter to remove ammonia from the water. Consequently, bactericidal effects of U.V. light were examined under the controlled condition of water with flow rate 730ml/sec (water flow thickness: 10mm), the width 41cm of water flow route, and the distance 4.75 cm from the lamp to its water bottom, and U.V. light 75W (5 lamps). The water of the aquarium tank will be theoretically circulated 1 cycle per 18 min. In these conditions the bactericidal effect was 85 % just after passing through U.V. light and 3 log cycle in aquarium tank water. The count of Vibrio parahaemolyticus just after irradiation was decreased by about over than 3 log cycle. Under the irradiation for 72 hours, viable cell counts in both skin and gill of fish reared were decreased into about 2 log cycle, but there was no significant decrease in viscera. When the temperature of the tank was controlled at about 20~23℃ under the same condition, viable cell counts were reduced about 2 log cycle, and fecal coliforms were reduced about 1 log cycle and 3 log cycle in Crassostrea gigas and Mytilus edulis, respectively.
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최승태,박미연,장동석 ( Seung Tae Choi,Mi Yeon Park,Dong Suck Chang ) 한국수산과학회 1994 한국수산과학회지 Vol.27 No.6
Simultaneous removal of phosphorus and nitrogen from wastewater was studied by the anaerobic-aerobic system of activated sludge. In the anaerobic stage, most of the influent glucose was removed and orthophosphate was released, when the nitrate and/or nitrite concentration in the wastewater was almost zero. The amount of the released phosphorus was found to be directly proportional to the amount of the removed glucose. When the ratio of phosphorus to glucose in the influent was less than 0.04, the phosphorus in the wastewater was almost completely removed during the aerobic state. Under the anaerobic condition, activated sludge released phosphate and excess removal of phosphate occurred during the aerobic condition. Namely, the stress received in anaerobic period stimulated the uptake of phosphorus in aerobic period. The amounts of phosphorus release in the anaerobic and uptake in the aerobic stage were less in proportional to the concentration of NO_x-N. Further, if the initial ratio of NO₂-N/glucose was less than 0.37, the inorganic nitrogen in the influent could be completely removed.
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Vibrio vulnificus 균의 분포 및 세균학적 특성
김영만,장동석,최승태,신일식 한국수산학회 1986 한국수산과학회지 Vol.19 No.2
Vibrio vulnificus is a recently recognized halophilic organism that may cause serious human infec-tions. Patients in fected with V. vulnificus often have a history of exposure to the sea, suggesting that the organism may be common inhabitant of marine environment. The strain used in this experiment was isolated from sea water and sea products such as common octopus (Octopus variabilis), ark shell (Anadara broughtonii), blue crab (Ericheir Japcnica), and sea squirt (Synthia roretzi) Collected in Pusan area from July to October in 1985. V. vulnificus was frequently isolated in August when temperature of sea water was around 26℃ and rarely isolated in October when temperature of sea water was around 18.5℃. The distinctive biochemical characteristics of V. vulnificus sere ONPG hydrolysis positive and fermented lactose and not grown in peptone water contained 8% NaCl. The optical density at 660nm of the growth of V. vulnificus was reached maximum level after 8 hours of culture at 35℃ in brain heart infusion broth but that of V. vulnificus was little increased at 15℃ for 14 hours. Optimum temperature and pH for the growth of V. vulnificus were around 35℃ and 8.0. The specific growth rate and the generation time of V. vulnificus isolated from the samples were 1.21hr-¹, 34min at 35℃ and 0.61hr-¹, 69min at 25℃, respectively. V. vulnificus did not grow on eosin-methylene-blue agar, salmonella-shigella agar, deoxycholate agar but grew well on Endo agar, xylose-lysine-deoxycholate agar and hektoen enteric agar. On Endo agar, the colonies of V. vulnificus were red and achieved a diameter of 2 to 4 mm as a feature enabling differentiation of V. vulnificus from other Vibrio spp. V. vulnificus grow well on TCBS agar forming green colonies. V. vulnifcus refrigerated at 4℃ exhibited a linear decline of its viablity as 1 log cycle in every 16hours storage, while V. vulnificus freezed at -18℃ almost became extinct.
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