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Al₂O₃物性(Ⅰ) : 粉末法에 依한 α-Al₂O₃의 構造解析 The structure analysis of α-Al₂O₃ by powder method
白南柱,朴載昊,陳光守,黃海善 부산대학교 1972 論文集 Vol.13 No.1
The molecular structure of α-Al₂O₃ is well known being already analyzed by the power method of X-Ray. The diffraction angles of X-Ray beam are measured by the intensity distribution of diffraction beam of X-Ray. The structure of α-Al₂O₃ was Supposed to be a rhombohedron and the Miller-index was determined by a axial transformation from rhombohedral system to hexagonal system. As a result of this study, the lattice constant and axial angle were 5.1252±0.0017 Å and 55°17′ respectively, and the chemical unit per unit cell is two.
전태원,우재홍,신창호,이기봉,이광희,박익렬,박성태,강현주 서울대학교 체육연구소 2000 서울大學校 體育硏究所論集 Vol.21 No.1
The purpose of this study this study was to comparative analysis the V02max and HR through arm ergometer exercise, bicycle ergometer exercise, and treadmill exercise and to propose correct data of aerobic ability according to GXT. Subjects for study were 8 healthy male students. The process of the test were performed maximal GXT on arm ergometer exercise, bicycle ergometer exercise, and treadmill exercise and measured V02max, max heart rate and recovery time of 3 VO2 and heart rate respectively. The conclusions were supported by the findings of this study: 1.There were significant differences between test style and V02/kg/min(p<.05). 2.There were significant differences between test style and test stage at heart rate(p<.05) There were no effect of reciprocal action. Therefore, V02/kg/min should be on individual exercise prescription guiedlines for health promotion should be provided proper GXT which are arm ergometer exercise, bicycle ergometer exercise, and treadmill exercise.
c-fos mRNA Expression in the Vestibular System following Hypergravity Stimulation in Rats
Guang Shi Jin,Jae Hyo Lee,Jae Hee Lee,Moon Young Lee,Min Sun Kim,Yuan Zhe Jin,Jeong Hoon Song,Byung Rim Park 대한생리학회-대한약리학회 2007 The Korean Journal of Physiology & Pharmacology Vol.11 No.1
Altered environmental gravity, including both hypo- and hypergravity, may result in space adaptation syndrome. To explore the characteristics of this adaptive plasticity, the expression of immediate early gene c-fos mRNA in the vestibular related tissues following an exposure to hypergravity stimulus was determined in rats. The animals were subjected to a force of 2 g (twice earth s gravity) for 1, 3, or 12 h, and were examined poststimulus at 0, 2, 6, 12, and 24 h. RT-PCR (reverse transcription polymerase chain reaction) and real-time quantitative RT-PCR were adopted to analyze temporal changes in the expression of c-fos mRNA. The hypergravity stimulus increased the expression of c-fos mRNA in the vestibular ganglion, medial vestibular nucleus, inferior vestibular nucleus, hippocampus, cerebellum, and cortex. The peak expression occurred at 0 h poststimulation in animals stimulated with hypergravity for 1 h, and at 6 h poststimulus in those stimulated for 3 h. In contrast, those stimulated for 12 h exhibited dual peaks at 0 and 12 h poststimulus. Bilateral labyrinthectomy markedly attenuated the degree of c-fos mRNA expression. Glutamate receptor antagonist also dramatically attenuated the degree of c-fos mRNA expression. These results indicate that expression of c-fos mRNA in response to hypergravity occurs in the vestibular related tissues of the central nervous system, in which peripheral vestibular receptors and glutamate receptors play an important role. The temporal pattern of c-fos mRNA expression depended on the duration of the hypergravity stimulus.