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- 저자 : 유정아 ( Jeonga Yu ) (검색결과 2 건)
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희토류 금속이온 (Ln(III))과 Acetamide 사이의 상호작용에 대한 연구
이상원,유정아,윤창주,전유혁,최영상,Sang-Won Lee,Jeonga Yu,Chang-Ju Yoon,Yoo-Hyek Jun,Young-Sang Choi 대한화학회 1992 대한화학회지 Vol.36 No.2
아세트아미드(AA)의 CO기와 희토류 금속이온(Ln(II))을 포함하는 몇 가지 lanthanide shift reagent(LSR) 사이의 상호작용을 이해하기 위하여 AA의 $2{\nu}_{C=0}$ + amide III 조합띠를 $15^{\circ}$ ${\sim} 45^{\circ}C$에서 조사하였다. 묽은 $CCl_4$ 용액속에서 하나의 AA가 사용된 LSR에 배위되어 1 : 1 AA-LSR 복합체를 이루며, Ln(Ⅲ)이온에 대한 AA의 배위 위치는 카르보닐의 산소임을 알았다. 온도 및 농도에 따른 이 조합띠의 변화로부터 Ln(III)${\cdot}$O=C 결합에 대한 여러가지 열역학적 함수들을 구했다. Eu$(dpm)_3$, Yb$(dpm)_3$ 및 Pr$(dpm)_3$에 대한 AA의 결합의 세기를 나타내는 ${\Delta}H^{\circ}$는 각각 -39.1, -28.4 및 -25.5kJ/mol이다. 이들 값을 비교해보면 AA 분자가 배위될 때 중심금속이온의 ionic potential 효과보다는 이미 배위되어 있는 커다란 dpm 분자에 의한 입체장애효과가 더 큼을 알 수 있다. The $2{\nu}_{C=0}$ + amide III combination band spectrum of acetamide (AA) was obtained in very dilute solutions of AA+lanthanide shift reagents (LSR) in carbon tetrachloride over the range of $15^{\circ}$ to $45^{\circ}C$. It was found that only 1 : 1 AA-LSR complex is formed by the interaction between carbonyl oxygen of AA and central metal ion(Ln(Ⅲ)) in LSR. The thermodynamic parameters for Ln(III)${\cdot}$O=C bond were determined by computer analysis of concentration and temperature dependent spectra. ${\Delta}H^{\circ}$ for the coordination of AA to Eu$(dpm)_3$, Yb$(dpm)_3$, and Pr$(dpm)_3$ have been found to be -39.1, -28.4, and -25.5 kJ/mol, respectively. It has shown that this type of ion-dipole interaction is more than twice stronger compared to the dipole-dipole interaction in the amide linkage, and largely depending on the steric hindrence effect by the bulky dpm groups around central metal ion (Ln(III)) rather than the ionic potential effect of central metal ion itself.
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김미랑 ( Mirang Kim ),유정아 ( Jeonga Yu ),배은경 ( Eunkyoung Bae ),석웅 ( Woong Seok ),하범만 ( Beomman Ha ),최병섭 ( Byungseop Choi ) 국군의무사령부 2020 대한군진의학학술지 Vol.51 No.1
Objective; This study aims to check adequacy of current obesity classification in Korea among young male soldiers. Method; We surveyed 316 military personnel who agreed this study with structured questionnaire. They answered voluntarily the questionnaire and also wrote down their data of medical examination, body composition and army physical fitness test. Results; Subjects were classified as by Body Mass Index(BMI): underweight(<18.5) 1, normal(18.5-22.9) 129(40.8%), overweight(23-24.9) 91(28.8%), obese(25-29.9) 78(24.7%), severe obese (30≤) 17(5.4%). Obesity rate was 30.1% by BMI 25, 14.6% by Body fat(25%) and 18.7% by waist cimcumference(90cm), respectively. This classification by BMI presents 87% of sensitivity, 79.6% of specificity based on 25% Body fat. When we analysed BMI ROC curve by Body fat(25%), sensitivity and specificity were 80.4% and 90% at the point of BMI 26.05. Almost two-third(67%) of Overweight group and one-third(30.8%) of Obese group showed more than 45% of muscle ratio. All of them had less than 25% body fat. In the over obese group, there were statistically significant differences when analyzing the abnormality of medical examination and passing the physical fitness test by dividing into 45% muscle ratio and 25% body fat, respectively. Conclusion; This study shows that it may be appropriate to reclassify some of overweight(23≤BMI<25) and Obese(25≤BMI<30) young men as normal or overweight in Republic of Korea Army considering possibility of muscle excess. If we study more subjects in the future, new and appropriate cut-off values from normal to obese could be suggested.
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