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Fenoterol 의 혈청 K+ 강하효과:경구 및 흡입투여의 효과
유세화,김열홍,유혜경,서순규 대한내과학회 1986 대한내과학회지 Vol.30 No.5
The systemic effect of inhalation of fenoterol, a β₂-agonist, especially the effect on plasma potassium was studied in four groups of four healthy young subjects. Group I received 3 times 1 puff inhalation(0.2 mg fenoterol/puff), group Ⅱ 3 times 2 Puffs, and group Ⅲ 3 times 4 puffs. Group Ⅳ took 1 tablet of fenoterol(2. 5 mg fencterol/tablet). Plasma potassium, sodium, chloride, calcium, glucose, pulse rate and mean arterial pressure were checked at 15-min intervals for 60 minutes in group I, Ⅱ, Ⅲ, and 30-min intervals for 120 minutes in group Ⅳ, Plasma potassium levels decreased in subjects who received fenoterol inhalation; the decrease was 0. 26±0.16(S.D.)mmol/L in group I, 0.73±0,47 mmol/L in group Ⅱ and 0.76±0.2.3 mmol/L in group g. In group Ⅳ plasma potassium levels were unchanged. Plasma glucose and pulse rate al o increased significantly after fenoterol inhalation. In conclusion, inhalation of fenoterol showed measurable systemic effects and especially induced hypokalemia may be dangerous in patients with cute asthmatic attack.
Emission Stability of Semiconductor Nanowires
유세기,정태원,이상현,허정나,이정희,이철진,김진영,이형숙,국윤필,김종민,Yu, Se-Gi,Jeong, Tae-Won,Lee, Sang-Hyun,Heo, Jung-Na,Lee, Jeong-Hee,Lee, Cheol-Jin,Kim, Jin-Young,Lee, Hyung-Sook,Kuk, Yoon-Pil,Kim, J.M. The Korean Vacuum Society 2006 Applied Science and Convergence Technology Vol.15 No.5
열 화학기상법으로 만든 GaN와 GaP 나노와이어에서 전계 방출과, 산소와 아르곤 분위기에서 안정성에 대해 조사하였다. GaN 나노와이어의 경우 산소 분위기에서 전계 방출이 급격하게 줄었으나, GaP에서는 그렇지 않았다. 두 나노와이어 모두 아르곤 분위기에서는 큰 변화가 없었다. GaP 나노와이어의 외부에 존재하는 산화물 층이 전자 방출 안정성에 크게 기여한 것으로 생각된다. 나노와이어에서 방출된 전자의 에너지 분포를 통해 반도체 나노와이어는 탄소 나노튜브와 그 전계 방출 메카니즘이 다름을 유추할 수 있었다. Field emission of GaN and GaP nanowires, synthesized by thermal chemical vapor deposition, and their emission stabilities under oxygen and argon environments were investigated. The field emission current of GaN nanowires was seriously deteriorated under oxygen environment, while that of GaP was not. Both wires did not show any noticeable change under argon environment. The existence of oxide outer shell layers in the GaP nanowires was proposed to be a main reason for this emission stability behavior. Field emission energy distributions of electrons from these nanowires revealed that field emission mechanism of the semiconductor nanowires were different from that of carbon nanotubes.