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키토산올리고당을 이용한 넙치 기생성 스쿠티카 섬모충 ( Scuticociliatids ) 구충 효과 - 1 . 약욕에 의한 구충효과 -
김정우(Jung Woo Kim),송현철(Hyun Chul Song),김희경(Hee Kyung Kim),유광재(Kwang Jay Yoo) 한국키틴키토산학회 2001 한국키틴키토산학회지 Vol.6 No.2
N/A The purpose of this study was to evaluate the antiparasitic activity of chitosan-oligosaccharides to Scuticociliatids. All Scuticociliatids used were directily collected from Paralichthys olivaceus. Chitosan-oligosaccharides consisting of 73.4% with 1-4 oligosaccharides and 26.6% over tetramer were prepared. After the treatment of 0.5%(w/v) chitosan-oligosaccharides against Schuticociliatids, there were dramatically decreased numbers of the protozoan up to approximately 98% in 3 minutes, 100% in 5 minutes compared to those in the control(P<0.01). Also the treatments of 0.3%(w/v) chitosan-oligosaccharides showed the protozoacidal responses of 80% in 5 minutes as well as 100% in 30 minutes. These parasites were killed about 80% within one hour by 0.1%(w/v) chitosan-oligosaccharides, but did not died until 2 hours by 0.01%(w/v) chitosan-oligosaccharides. Consequently, we confirmed that the chitosan-oligosaccharides could be applied as one of protozoacidal agents against Scuticociliatids in Japanese flounders.
키토산올리고당이 주요 종자의 발아와 in vitro 유식물의 생육에 미치는 효과
안준철(Jun Chul Ahn),정영재(Young Jae Jung),김성호(Sugn Hoo Kim),김응식(Eung Sik Kim),여문환(Mun Han Yea),황백(Baik Hwang),송현철(Hyun Chul Song),유광재(Kwang Jay Yoo),김정우(Jung Woo Kim) 한국키틴키토산학회 2001 한국키틴키토산학회지 Vol.6 No.3
N/A The physiological effects of chitosan-oligomer on germination ratio, elongation ratio of seedling, and fresh weight in various kinds of vegetables (Chinese cabbage, radish, cucumber, watermelon, and melon) which are provided by domestic seed companies were investigated. Considering the effects of chitosan-oligomer on plant growth, it is concluded that chitosan-oligomer have the function of physiological activator even though there are some differences between species. The treatment concentration ranged from 0.01% to 0.05% was most effective in its physiological activation. Especially, cucumber and watermelon that are in the same taxa (Cucurbitaceas) showed a similar physiological response to chitosan-oligomer. As the results, the physiological activation of chitosan-oligomer on plants was affirmative in the domestic major vegetables as well.
키토산 올리고당에 의한 HL-60 세포의 성장 억제 및 apoptosis 유도
정용욱(Yong Wook Jeong),김기성(Ki Sung Kim),오재영(Jae Young Oh),박종천(Jong Chun Park),이제철(Je Chul Lee),유광재(Kwang Jay Yoo),김정우(Jung Woo Kim),장석종(Seok Jong Chang),백원기(Won Ki Baek),서성일(Seong Il Suh),서민호(Min Ho Suh 한국키틴키토산학회 2000 한국키틴키토산학회지 Vol.5 No.2
Chitosan-oligosaccharides (OCHT) have been suggested that it has an inhibitory effect on cancer cell growth. However, the precise mechanism remains to be elucidated. Recently, apoptosis has been recognized that it plays a key role in protection of cancer development. To elucidate the mechanism underlying inhibition of cancer cell growth by OCHT, it is necessary to determine whether the OCHT inhibit the growth of HL-60 cells (human promyelocytic leukemia cell line) through apoptosis. The growth rates of HL-60 cells were remarkably decreased after OCHT treatment. The induction of apoptotic DNA fragmentation by adding OCHT were occurred in a dose dependent fashion. In apoptotic HL-60 cells, caspase-3 activation and Bcl-2 protein down-regulation were shown. Thug, our data suggest that OCHT may inhibit the growth of HL-60 cells through induction of apoptosis.