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광합성세균 Rhodospirillum rubrum의 생장과 Bacteriochlorophyll 및 Carotenoids의 형성에 대한 탄소원의 영향
송승희,이수오,오덕철 濟州大學校 基礎科學硏究所 1994 基礎科學硏究 Vol.7 No.1
광합성 세균인 Rhodospirillum rubrum으로 생장과 색소 형성에 대한 탄소원의 영향을 조사하였다. 탄소원은 acetate, alanine, glutamate 그리고 malate였으며 단독 또는 혼합하여 사용하였다. 세포 생장은 glutamate배지에서 가장 느렸으며 glutamate-malate 혼합배지에서 가장 빨랐다. acetate와 glutamate를 혼합 하였을 때는 두 가지를 단독으로 사용했을 때보다 월등히 빠른 생장을 나타내었다. 대부분의 경우 탄소원을 단독으로 사용했을 때보다 혼합하였을 때 빠른 생장을 나타내었다. 대부분의 경우 탄소원을 단독으로 사용했을 때보다 혼합하였을 때 빠른 생장을 나타내는 것으로 보인다. 색소가 없는 R.rubrum은 혐기적으로 광을 조사하였을 때 bacteriochlorophyll과 carotenoid를 탄소원의 종류에 관계없이 동시에 형성하였으며 bacteriochlorophyll 비함량은 alanine 배지와 glutamate-alanine 혼합배지에서 가장 높고, carotenoid 비함량은 malate 배지와 malate-alanine 혼합배지에서 가장 높아서 두 색소의 비함량에 대한 탄소원의 영향은 다르게 나타났다. 탄소원에 따른 생장량과 색소 함량은 반드시 일치하지 않았고 색소 형성이나 생장에 있어서의 효과는 탄소원의 종류에 따라 달랐다. 세포내 bacteriochlorophyll에 대한 carotenoid의 비함량비는 다소 변화가 있으나 대개 1: 1 수준이었다. The influences of organic compounds such as acetate, alanine, glutamate and malate, on the growth and formation of photosynthetic pigments as a sole or mixed carbon sources were tested in a photosynthetic bacterium, Rhodospirillum rubrum. Cells grew most rapidly in culture on glutamate-malate mixtrues and showed slowest growth in glutamate among all cultures.Cells cultured on acetate-glutamate mixtures showed much rapid growth than those on single carbon source separately. Cells cultured on mixed carbon sources generally grew more rapidly than those on each single carbon source, so it seems that mixtures of carbon sources exhibit synergistic effect on cell growth. The for mation of bacteriochlorophyll and carotenoids was initiated simultaneously regardless of the kind of carbon source. The synergistic effect of mixed carbon sources on the formation of photosynthetic pigments of R. rubrum was not shown distinctly. The influence of carbon sources on the growth and formation of photosynthetic pigments were not coincided. The ratios of specific contents of carotenoids to bacteriochlorophyll were about 1 : 2 with some variations according to carbon sources.
송미숙,전기홍,송현종,김정은,박승구,신상건,이동훈,정성현,최연주,최완철,최민규,황재철,홍지만 아주대학교 1997 아주의학 Vol.2 No.2
This study was performed to identify risk factors for depression among the elderly in a rural area. A survey was done for the elderly living in Gosam-myenn, Ansung-kun during the period of July 28, 1997 and July 30, 1997. Demographic and sodoeconornic characteristics, and functional and health Status were assessed using a structured questionnaire, and the level of depression was measured by GDS score. The data obtained were analyzed by frequencies, percentage, t-test, ANOVA, and multiple regression, and the results were as follows: 1. The total sample consisted of 133 elderly. Of them, 47 elderly (35.4%) showed significant depressive Symptoms. 2. The GDS score was the highest for the group over 85 years of age (p < 0.05). Those living alone or widowed showed lower GDS score than those living with someone or married (p < 0.05). 3. The GDS score was the highest in the absolutely dependent group, followed by the partially dependent group, and the independent group (p < 0.01). The elderly who perceived their health Status as excellent showed the lowest GDS score. In contrast, those who had more than five chronic diseases showed the highest GDS score. 4. The elderly receiving financial and emotional support from their family or friends showed lower GDS score compared to those without any support. 5. The economically dependent group showed higher GDS score than that of independent group. 6. The elderly who involved in leisure activities showed lower GDS score than those without any involvement. 7. In terms of risk factors for depression, we found that perceived health Status, subjective economic Status, leisure activities, living arrangement and financial support were inversely associated with GDS score, whereas labor support was positively associated with GDS score. Based upon the above findings, this study suggests that these risk factors for depression in the elderly should be taken into consideration for a comprehensive mental health program for the elderly living in the rural area.
송승찬,신진호,강석우,박경남,최호순,박근태,문희식,기춘석,이성희,윤병철,노우균,조균석,이민호 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3
Tetrodotoxin is a neurotoxin produced by about 90 species of puffer fish and causes paralysis of central nervous system and peripheral nerves by blocking the movement of all monovalent cation. Ingestion of tetrodotoxin produces clinical manifestations such as paresthesias(within 10-45 min), vomiting, lightheadedness, salivation, muscle twitching, dysphagia, difficulty in speaking, convulsion and death that expressed by cardiopulmonary arrest with loss of brain stem reflex sometimes. Tetrodotoxin prevents or delays ischemia induced neuronal death by way of following 3 mechanisms. Firstly, it reduces the energy demand of the brain tissues. Secondly, it delays or even prevents anoxic depolarization. Finally, it deminishes ischemia induced cell swelling and cerebral edema. We report a case of puffer fish poisoning which presented with cardiopulmonary arrest and loss of brain stem reflex, but completely recovered by aggressive cardiopulmonary resuscitation.
배전용변압기의 소음저감을 위한 진동주파수의 스펙트럼분석
김재철,이현구,송승엽,이도훈 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
This paper analyze spectrum of vibration-frequencies to reduce noise level of d transformer. Using loading back method on same condition of real load to grasp th core and winding which are caused by the transformer vibration. We were mea vibration-frequency by varing appiled voltage and load current of a transformer. cause of a transformer vibration is occured by the harmonic effects, and was identifi vibration is less influenced by the coil. As the result of this paper, comparing the transformer with some isolated materi general transformer, the transformer with some isolated material could reduc amplitude of vibration-frequencies.
임성철,박상기,도남용,박상학,이승일,송창훈,박종 朝鮮大學校 附設 醫學硏究所 1998 The Medical Journal of Chosun University Vol.23 No.1
There are many advantages and disadvantages under the limited bachelor's admission system. To diminish the demerits and to increase the merits of this system, the authors posed questions to the faculties and students of the Department of Medicine. Chosun University College of Medicine and other colleges in Korea. The questionnaire was made according to trends and feelings in this system. We received a lot of information and suggestions as to how to improve the system, in the following paper we discuss and report the prospective aspects of the bachelor's admission system.
홍승철,송정민,정종현,권용실,한진희,이성필 大韓神經精神醫學會 2003 신경정신의학 Vol.42 No.5
Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness, cataplexy, sleep paralysis, hypnagogic hallucinations and disrupted nocturnal sleep. We report a patient with a diagnosis of schizophrenia who was subsequently diagnosed as narcolepsy. A case of a 22-year-old woman with concomitant narcolepsy and psychotic symptoms was discussed from a perspective of the diagnosis and therapeutic challenges, particularly on pharmcological treatment dealing with issues raised by their coexistence.
정하중 및 동하중을 받는 강구조물의 최적 설계에 관한 연구
노승훈,방중철,송호중 金烏工科大學校 1994 論文集 Vol.15 No.-
Nowadays, the parking is a very serious problem almost everyhere. It is even more serious in the parking lot of the high storied apartment. Many parking devices have been developed to solve this problem by increasing the parking capacity within the limited areas. In this study parking devices are considered to obtain the optimum for the capability of carrying the required load and for the minimization of the material usage for the structure. The design of the parking structure studied in this work can readily be applied to many different parking devices.