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- 저자 : 조광현(Kwang Hyun Cho) (검색결과 426 건)
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조광현(Kwang Hyun Cho),강승주(Seung Joo Kang),이유신(Yoo Shin Lee),김철우(Chul Woo Kim) 대한피부과학회 1986 대한피부과학회지 Vol.24 No.6
We report a case of angiosarcoma of the face and scalp in a 76-year-old man. Immunochemical staining with factor 8-related antigen and ultrastructural find ings confirm that this tumor was origined from endothelium. The patient had a good initial response to treatment with radiotherapy.
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조광현(Kwang Hyun Cho),이주홍(Joo Heung Ree),이유신(Yoo Shin Lee),한성구(Sung Koo Han) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.4
We report a 58 year old man who complained that his nails didn't grow for a year and developed yellowish discoloration. On physical examination his nails showed yellow greenish discoloration, increased corvexity, loss of lunulae and cuticles. C]iest X ray revealed atelectasis on right lower lung field and bronchiectasis on left lower lung field. Mild restrictive pattern was observed in pulmoniry function test. We gave him 800IU of Vitamin E claily for 3 months, but rio remarkable changes have been observed as yet..
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La3+에 의한 토마토 뿌리조직 마이크로솜 H+-ATPase 활성저해
조광현 ( Kwang Hyun Cho ),김영기 ( Young Kee Kim ) 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.2
In order to find a chemical agent which is able to modulate the activity of H^+-ATPase, microsomal preparation was obtained from the root tissue of tomato plant and the effect of La^3+ was measured. The activities of plasma and vacuolar membrane H^+-ATPase were analyzed by the inhibited activities using their specific inhibitors, vanadate and NO_3^-, respectively. La^3+ inhibited microsomal ATPases in a dose-dependent manner and the inhibitory effect of La^3+ was suppressed by both vanadate and NO_3^-, implying that La^3+ inhibits both plasma and vacuolar membrane H^+-ATPase. The Ki values of La^3+ which inhibit 50% of the activities of plasma and vacuolar membrane H^+-ATPase were 57 and 78μM, respectively. The H^+-ATPase of the leaky microsomes made by the treatment of Triton X-100 were also inhibited by La^3+, suggesting that La^3+ directly inhibits both enzymes. Meanwhile, the inhibitory effect of La^3+ was decreased by increasing the concentration of ATP. The effect of ATP was also concentration-dependent and 7 mM ATP completely removed the inhibitory effect of La^3+. These results imply that La^3+ inhibits both plasma and vacuolar membrane H^+-ATPase by decreasing the binding affinity of ATP and La^3+ can be used to control the activity of root H^+-ATPase.
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토마토 뿌리조작에서 분리한 마이크로솜의 Ca2+ 흡수 특성
조광현(Kwang Hyun Cho),김영기(Young Kee Kim) 한국응용생명화학회 1999 Applied Biological Chemistry (Appl Biol Chem) Vol.42 No.2
In order to characterize the property of Ca^(2+) transport in plant cell, microsomes were prepared from the roots of tomato and microsomal ^(45)Ca^(2+) uptake was measured. When 1 mM vanadate, a selective inhibitor of P-type ATPases, 50 mM NO₃^-, a specific inhibitor of vacuolar H^+-ATPase, and both of these inhibitors were treated, the microsomal ^(45)Ca^(2+) uptakes were inhibited by 20, 33 and 47%, respectively. The inhibitory effects of these two inhibitors were investigated by using a protonophore, gramicidin. When the chemical gradient of H^+ was relieved by gramicidin, the uptake was decreased by 30%, implying the presence of Ca^(2+)/H^+ antiporter in the microsomal membrane. In the ^(45)Ca^(2+) uptake experiment, the effect of gramicidin was independent of vanadate-induced inhibition. However, when the activity of vacuolar H^+-ATPase was inhibited by NO₃^-, the effect of gramicidin was severely decreased. Meanwhile, thapsigargin, a specific antagonist of ER/SR-type Ca^(2+)-ATPase, inhibited the microsomal ^(45)Ca^(2+) uptake and the maximum inhibitory effect was obtained at 10 μM. The effect of thapsigargin was blocked by NO₃^- and gramicidin, but not by vanadate. These results imply that vanadate directly inhibits the activity of Ca^(2+)-ATPase; however, NO₃^- and thapsigargin block the activity of Ca^(2+)/H^+ antiporter by inhibiting the vacuolar H^+-ATPase. In conclusion, the microsomal ^(45)Ca^(2+) uptakes are mediated by two major enzymes, Ca^(2+)-ATPase and Ca^(2+)/H^+ antiporter in tomato root tissue.
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