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양식산 Tubot, Scophthalmus maximus 감염원으로 확인된 Iridovirus의 분자생물학적 연구
김기홍,김위식,김춘섭,김영진,키타무라신이치,정성주,정태성,오명주 한국양식학회 2004 韓國養殖學會誌 Vol.17 No.1
2003년 6월과 7월, 고창에서 사육중인 turbot이 약 90% 누적폐사되었고, 주 증상은 안구돌출, 비장 비대 그리고 장내 내용물이 없는 것으로 관찰되었다. 병리조직학적 검사에서 RSIV와 유사한 이형비대세포가 모든 장기에서 관찰되어 RSIV검출을 위한 primer로 PCR을 실시하였다. 그 결과 PCR에서 특이밴드가 모든 조직에서 검출되어졌고, 염기서열 분석 결과 기존에 보고된 strain과 88%이상의 유사성을 나타내는 것으로 확인 되어져서 터봇의 페사 원인으로 이리도바이러스감염이 관여됨을 확인할 수 있었다. The high mortality of cultured turbot, Scophthalmus maximus was occurred from Gochang in June, 2003. Infect fish with iridovirus showed a lower feed intake and lethargic. These fish exhibited pale body color, extended abdominal and exophthalmus. Histopathological studies showed basophilic enlarged cells from kidney, spleen, gill, heart, muscle, stomach, intestine, liver and pancreas of these fish. In PCR amplification with red sea bream iridovirus (RSIV) specific primer set of a DNA fragment of 286 bp was obtained from infect turbot with the virus. The strain showed the high homologies with RSIV, LBIV (largemouth bass iridovirus), GSIV (giant seaperch iridovirus) and SBIV (sea bass iridovirus).
김기홍,강동호,손다솜,정빛남,이준혁,심진기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
This study aimed to investigate oxidative biodegradation behavior in oxo-biodegradable low-density polyethylene (LDPE) films. The oxo-biodegradable LDPE films were prepared by T-die twin extrusion with 1, 2, 3 wt% additives. It does not show a significant decrease in melting and crystallization temperature, and elongation and tensile strength compared to LDPE. The degradation behavior was investigated by a change in mechanical properties and molecular structure on heat or UV/heat exposure. The oxidative biodegradation at 50 ℃ was able to observe the COO peak after about 50, 70, and 100 days, and the elongation decreased after about 130, 150, and 170 days. In accelerated weathering analysis at UV and 50 ℃, the elongation decreased after about 4 and 8 days, and the COO peak also increased significantly. Finally, the oxo-biodegradable LDPE films were decreased mechanical properties by 100%, and the molecular weight was decomposed from about 280,000 g/mol to less than 30,000 g/mol.