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Solid Phase Cyclic Peptide Synthesis
류세열,류선종,이윤식 한국공업화학회 1992 한국공업화학회 연구논문 초록집 Vol.1992 No.0
Cyclization reactions of model peptides were conducted on nitrobenzophenone oxime resins. Four model peptides with different chain length which contain N-terminal Met or Trp residus as an electron donor were prepared on the oxime resins. Cyclization reactions of the model peptides were monitered by reversed phase HPLC. Pseudo first order rate constants were obtained in 6 different organic solvents with various polarity. The results showed that cyclization rate constants in THF were the greatest and the one in DMF were the smallest in four model peptide cases. Good correlations were obtained between the rate constants and the E<sub>T</sub> values of the solvents. Interestingly, the rate constants were decreased with increasing temperatures, which clearly implicated that the cyclization process proceeded via charge-transfer complex formation.
류세열,진상협,김지현 대한수면연구학회 2017 Journal of sleep medicine Vol.14 No.2
Non-rapid eye movement sleep parasomnias including sleepwalking tend to disappear spontaneously during late childhood and adolescent period. Sleepwalking is not as common in adults as in children. Sleepwalking in adults could happen with triggering factors such as hypnotics or metabolic derangement including hypoglycemia. We report a case of an adult patient with recurrent, frequent sleepwalking and complex motor behaviors during sleep in his mid- twenties after spontaneous remission of sleepwalking in the childhood. The triggers were severe sleep deprivation and obstructive sleep apnea. No more sleepwalking was reported after the treatment of sleep apnea by tonsillectomy.
고등학교 화학Ⅱ의 고체 용해도 측정 실험에 대한 분석 및 개선
윤정아,박국태,박세열,황현숙,백인환,류상하 한국교원대학교 교육연구원 2010 敎員敎育 Vol.26 No.4
이 연구의 목적은 고등학교 화학Ⅱ 교과서에 제시된 온도에 따른 고체의 용해도 측정 실험의 문제점을 파악하여, 학생들이 재현성 있는 실험 결과와 정상적인 용해도 곡선을 얻을 수 있는 개선 실험을 제시하고자 하는 것이다. 연구를 위하여 화학Ⅱ 교과서의 고체의 용해도 측정 실험을 분석하고, 화학교사를 대상으로 고체의 용해도 측정 실험에 대한 설문 조사를 실시하여, 온도에 따른 고체의 용해도 측정 실험의 문제점을 파악하여 개선 실험을 제시하였다. 연구 결과, 화학Ⅱ 교과서에 제시된 고체의 용해도 측정 실험의 실험 방법은 서로 달랐으며, 화학교사들은 실험 결과에서 오차가 많이 나고 실험 시간이 많이 소요되어서 고체의 용해도 측정 실험을 실험 수업으로 실시하기 어려워하였다. 온도에 따른 고체의 용해도 측정 실험에서 용질과 용매의 질량 측정 방법, 용질이 모두 녹는 온도 측정 방법, 결정 석출 온도 측정 방법 등을 개선한 개선 실험으로 재현성이 있는 실험 결과와 정상적인 용해도 곡선을 얻을 수 있었다. The purpose of this study was to find out the problems in the experiments determining solid solubility according to temperature in high school chemistry Ⅱ textbooks, and to propose an improved experiment for students to achieve reproducible results and a normal solubility curve. For this study, the experiments determining solid solubility in high school chemistry Ⅱ textbooks were analyzed. Chemistry teachers filled out questionnaires about the experiments determining solid solubility. The problems of the experiments determining solid solubility according to temperature were analyzed, and an improved experiment was proposed. The results showed that experimental methods in most of high school chemistry Ⅱ textbooks were much different from each other. Chemistry teachers were having difficulties in the experiments determining solid solubility because the experiments were time consuming, and the results had errors. It was possible to get reproducible results and a normal solubility curve with the improved experiment which was carried out with improvements in the methods of measuring mass for solute and solvent and determining temperature for crystallizing and dissolving.