http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한국산 선발 계통, 일본산 양식 계통 그리고 이들 두 계통간 잡종 계통 참돔 치어의 총 암모니아성 질소 배설률 및 분 배출률을 통한 사료 내 단백질 이용 효율 비교
오승용,노충환,홍경표,김종만 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.3
An experiment was conducted to investigate the differences of total ammonia nitrogen (TAN) excretion rates and feces production rates among the offsprings from cultured Japanese strain (JJ, mean BW; 17.1 ± 0.1 g), intraspecific hybrid strain between cultured Japanese and selected Korean strain (JK, mean BW; 17.1 ± 0.1 g) and selected Korean strain (KK, mean BW; 21.5 ± 0.1 g) of red sea bream in order to compare their dietary protein utilization efficiency. Fish were hand-fed with a commercial diet containing 46.7% crude protein for 2 weeks, three times daily 09:00, 13:00 and 17:00. After daily feeding, the TAN excretion rates reached peaks of 49.03, 58.75 and 36.26 mg/kg fish/hr for the JJ, JK and KK strain, respectively, during the daytime. The value of the KK strain was significantly lower than that of the JJ and JK strain (P<0.05), however daily TAN excretion rates of the JJ, JK and KK strain were not different (P>0.05). When fish were fed at satiation after 4 days of starvation, TAN excretion rates reached the maximum values 4 hours after the feeding for the KK (31.23 mg/kg fish/hr) and 6 hours after the feeding for the JJ (44.19 mg/kg fish/hr) and JK strain (41.70 mg/kg fish/hr). After 3 days of starvation, the daily endogenous TAN excretion rates (ETE) for the JJ, JK and KK strain were 286.91, 215.66 and 179.29 mg/kg fish/day, respectively. The value of the KK strain was lower than that of the JJ and JK strain (P<0.05). The total feces production rates of the JJ, JK and KK strain were not significantly different, however the proportions of feces production rates by time for the JJ, JK and KK strain were different (P<0.05). As overall results, efficiency of dietary protein utilization of JJ, JK and KK seems to be different and KK strain could offer a desirable option for aquaculture purpose.
Effects of Organic Content on Anaerobic Biodegradability of Sludge Generating from Slaughterhouse
오승용,김호,김창현,윤영만,김승환 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.4
This study was carried out to investigate the effect of organic content level on ultimate methane potential and anaerobic biodegradability of substrate by biochemical methane potential assay. Three organic matters (whole sludge and liquid and solid fraction of sludge) of the same origin, which had different organic contents, were fermented at the batch anaerobic reactor for 70 days. Ultimate methane potential and anaerobic biodegradability were determined by the terms of volatile solid (VS) and chemical oxygen demand (COD). Volatile solid contents of whole sludge and solid and liquid fraction of sludge were 2.4, 18.8, and 0.2% and COD were 5.3, 30.4, and 0.5%, respectively. Ultimate methane potentials (Bu-VS) and anaerobic biodegradability (DVS) determined by VS content were 0.5 Nm3 kg-1-VSadded, 76.3% for whole sludge, 0.5 Nm3kg-1-VSadded, 76.3% for the liquid fraction of sludge, and 0.6 Nm3 kg-1-VSadded, 77.0% for the solid fraction of sludge. Ultimate methane potentials (Bu-COD) and anaerobic biodegradability (DCOD) determined by COD were 0.2 Nm3 kg-1-CODadded, 73.4% for whole sludge, 0.2 Nm3 kg-1-CODadded, 74.0% for the liquid fraction of sludge, and 0.33 Nm3 kg-1-CODadded, 99.1% for the solid fraction of sludge. In conclusion, ultimate methane potential and anaerobic biodegradability given by the VS term showed more reasonable results because COD might be underestimated by the interference of NH4+ in the case of highly concentrated organic material.