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김민수,곽민아,장우석,이기태,정기삼,정태영,서정철,서해경,안희덕,Kim, Min-su,Kwak, Min-ah,Jang, Woo-seok,Rhie, Ki-tae,Jeong, Kee-sam,Jung, Tae-young,Seo, Jung-chul,Seo, Hae-gyoung,An, Hee-duk 대한침구의학회 2003 대한침구의학회지 Vol.20 No.4
Objective : The effects of electroacupuncture(EA) stimulation on heart rate variability(HRV) for healthy adults are investigated with power spectrum analysis(PSA) of HRV. Methods : The HRVs of every 10 minute for 22 healthy volunteers(13 men and 9 women) were measured for an hour with SA-3000P(Medicore Co., Ltd., Korea). The median age with arithmetic range of 13 men and 9 women was 26.00 years with 22.75~27.00 years. The initial 20 minutes were defined as baseline period(pre-EA period), the following 20 minutes as the EA period and the last 20 minutes as the post-EA period. In each EA periods, volunteers received EA(2Hz, 0.6~0.8ms duration, maximal tolerated stimulation without discomfort) on the right Zusanli(ST36), Shangjuxu(ST37) acupoints while supine, resting. Results : Heart rate of volunteers at post-EA period was significantly decreased compare to that of pre-EA period, while SDNN at post-EA period was significantly increased. Heart rate at EA period was significantly decreased compare to that of pre-EA period, but Ln(LF) and LF/HF at EA period were significantly increased. Ln(HF) at post-EA period was significantly decreased compare to that of EA period, while the other variables were not significantly changed. Conclusions : The results suggest that EA in healthy adults is associated with changed activity in the sympathetic and parasympathetic nervous system. Further study is needed for investigating the effects of EA on HRV and autonomic nervous system.
구리와 Methylglyoxal에 의한 조류의 성장 및 인 흡수
이기태,이기성 한국환경독성학회 1999 환경독성보건학회지 Vol.14 No.4
Effects of various concentrations of copper in solid fibrous form and methylglyoxal (MG) on phosphorus uptake and growth change of green algae Scenedesmus obliquus were studied. There was significant differences among cultures treated with various concentrations of copper and MG in growth of algae with parameters of cell numbers, photosynthetic rate and cellular morphology, and phosphorus uptake by cell. When the copper in media is treated with 25mg or 50mg per 100 ml of Bristol solution, the mean cell number of algae was 15.642 x 10^(6) cells· ml^(-1) and 12.986 x 10^(6) cells·ml^(-1), respectively, while those of algae in culture without copper was 18.486 x 10^(6) cells - ml^(-l). The mean cell area of 2450 μm², 1894μm² and 1697μm² in basic media, basic media with 25 mg of copper and basic media with 50 mg of copper was showed the inhibitory effect of copper on algal growth. The algal growth was stimulated by MG when the culture was treated with 25mg of copper or without copper, while it was inhibited when the culture was treated with 50mg of copper. It was considered that there was significant interaction between copper and MG on algal growth. The phosphorus concentration in algal medium treated with 25 mg or 50 mg of copper was 29.435 ppm and 26.224 ppm, respectively, while those of algae in culture without copper was 52,8 ppm, which shows that the application of copper in algal medium can prevent the availability of phosphorus to algal cell.