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메기(Silurus asotus )에 투여한 멜라민의 체내함량 변화
김풍호 ( Poong Ho Kim ),조미라 ( Mi Ra Jo ),이희정 ( Hee Jung Lee ),김경덕 ( Kyoung Duck Kim ),하광수 ( Kwang Soo Ha ),유현덕 ( Hyun Duk Yoo ),유홍식 ( Hong Sik Lee ),이두석 ( Doo Seog Lee ),윤호동 ( Ho Dong Yoon ) 한국수산과학회(구 한국수산학회) 2011 한국수산과학회지 Vol.44 No.6
In 2007, pet food contaminated with melamine caused hundreds of dogs and cats to develop renal failure all over the world. In 2008, over 294,000 infants consumed infant formula and developed kidney stones in China. Further investigation revealed that fish feed also contained melamine; this raised concerns about melamine residues in edible fish tissues, which could have caused the urinary tract stone epidemic. In Korea, catfish fed with assorted feed that included cuttlefish organs that contained melamine developed whitening syndrome and fell dead in some populations in 2008. This event raised suspicions about the toxicity of melamine and all feeds containing melamine were immediately recalled. In this study, we investigated the rates of melamine accumulation and depletion in muscle and viscera of catfish to propose proper withdrawal periods. One group of catfish was fed a commercially available diet that contained 30, 100 and 300 mg melamine per kg diet for 14 days. To investigate residual melamine contents in muscle and viscera, other experimental groups were fed a melamine free diet after being fed melamine for 7 days. The residual amount of melamine was analyzed by LC-MS/MS. The melamine concentration in muscle was estimated to be 3.7 mg/kg after 6 days of feeding with a diet containing 300 mg melamine/kg. After 2 days of culture with a melamine free diet, the residual melamine was depleted and the concentration had decreased from 1.15 mg/kg to 0.19 mg/kg in the muscle of catfish fed a diet containing 300 mg melamine/kg for 7 days. The residual amount of melamine was reduced to 0.03 mg/kg in muscle after 7 days of culture with a melamine free diet and was undetectable after a prolonged culture period of 14 days. Catfish tend to excrete melamine rapidly after oral administration and changes in body color were not observed during the short dosing period.
윤영석 ( Young-seok Yoon ),김경덕 ( Kyoung-duk Kim ),이병훈 ( Byoung-hoon Lee ) 강원대학교 농업생명과학연구원 2021 강원 농업생명환경연구 Vol.33 No.3
This study estimates the utility of ripple effect on the society of returning farmers and returning villagers from social and economic benefits. Population segregation- and outflow-mediated ripple effect in urban and rural areas during returning to farming or village is estimated using the regional gross product increase/decrease model, which indicates direct economic effect and cost change in the environment (traffic confusion, sewage treatment, air pollution). Several social net benefits occur after moving to the rural area.