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토끼 腦 및 肝組織의 酵素活性에 對한 Phenylalanine 및 비타민 C의 影響에 關한 硏究
權肅貞 우석대학교 의과대학 1970 우석의대잡지 Vol.7 No.1
Sacrificing rabbits of l.5±0.3㎏ body weights, their brains and livers were excised out to study in vitro effects of excess phenylalanine or/ and equivalent amount of vitamin C on the GDA, LDH, and MDH together with LDH isozyme activities in the tissues in order to elucidate an enzymatic, aspect of experimental PKU, with the following results. 1. Prain and liver protein content of rabbits were reduced when incubated with excess phenylalanine, which was restored completely by the concomitant addition of vitamin C in the incubation mixture. 2. The GDA activities in the brain and liver of the animals showed decreased activities due to the presence of excess phenylalanine, and vitamin C brought more pronounced decrease in the activity instead of restoring control values. 3.The total LDH activities in the same tissues proved to be decreased by excess phenylalanine, which was, however, recovered a little by vitamin C treatment. H-LDH activity was decreased as well by excess phenylalanine, but restored strikingly by vitamin C to bring, in effect, a little restoration of total LDH, while, on the otherhand, the activity of M-LDH was not increased again by vitamin C treatment. 4. The MDH activties of the same tissue under the presence of excess phenylalanine showed decreased activities as was GDA and the decrement was more pronounced by the vitamin C treatment, 5. A brief biochemical discussion of the nature of the above results was made.
증착 및 열처리 조건에 따른 AZO/Cu/AZO 박막의 전기적 ‧ 광학적 특성 평가
김찬영,임하은,양가은,권숙정,강찬희,임상철,이택영 한국재료학회 2023 한국재료학회지 Vol.33 No.4
AZO/Cu/AZO thin films were deposited on glass by RF magnetron sputtering. The specimens showed the preferred orientation of (0002) AZO and (111) Cu. The Cu crystal sizes increased from about 3.7 nm to about 8.5 nm with increasing Cu thickness, and from about 6.3 nm to about 9.5 nm with increasing heat treatment temperatures. The sizes of AZO crystals were almost independent of the Cu thickness, and increased slightly with heat treatment temperature. The residual stress of AZO after heat treatment also increased compressively from -4.6 GPa to -5.6 GPa with increasing heat treatment temperature. The increase in crystal size resulted from grain growth, and the increase in stress resulted from the decrease in defects that accompanied grain growth, and the thermal stress during cooling from heat treatment temperature to room temperature. From the PL spectra, the decrease in defects during heat treatment resulted in the increased intensity. The electrical resistivities of the 4 nm Cu film were 5.9 × 10-4 Ω ‧ cm and about 1.0 × 10-4 Ω ‧ cm for thicker Cu films. The resistivity decreased as the temperature of heat treatment increased. As the Cu thickness increased, an increase in carrier concentration resulted, as the fraction of AZO/Cu/AZO metal film increased. And the increase in carrier concentration with increasing heat treatment temperature might result from the diffusion of Cu ions into AZO. Transmittance decreased with increasing Cu thicknesses, and reached a maximum near the 500 nm wavelength after being heat treated at 200 °C.