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한국 정상성인의 혈청지질농도 , 체질량지수 , 혈압 및 식습관과 일상생활습관과의 관계에 관한 연구 - 혈청 Triglyceride 를 중심으로
이기열,이양자,박연희,신현아,이종순 한국지질학회 1992 韓國脂質學會誌 Vol.2 No.1
The purpose of this study was to examine the levels of serum triglyceride (TG)/cholesterol (Chol) of healthy Korean adults and the correlations between these serum lipid levels and other health parameters such as blood pressure, obesity index, smoking, and food & daily habit. Since Korean consume a relatively large amount of carbohydrate, an emphasis was given to serum triglyceride levels. Measurements of body mass index (BMI), blood pressure, fasting blood sugar, serum triglyceride and cholesterol were made and a questionnaire on food & daily habit was given to each of 878 healthy adult subjects; 480 males and 398 females. The mean serum TG and Chol levels were 113.1±82.5 ㎎/㎗ and 191.6±41.0 ㎎/㎗ respectively. Serum TG and Chol levels showed a gradual increase with age in both sexes upto 50 years of age. The percent increases in serum TG & Chol levels of females after the age 50 were much greater than those of males. Distribution patterns of serum TG and Chol levels were different from each other in that the serum TG levels showed a skew curve, while the serum Chol levels showed a normal distribution curve. Serum TG levels increased with systolic blood pressure upto 159 mmHg and showed a statistically significant and consistent elevation with increment of diastolic blood pressure. BMI was more positively correlated with serum TG levels than with serum Chol levels. There was a significant correlation between serum lipids especially TG levels and food & daily habit scores. There exist significant differences in levels of serum TG and Chol between smoking and nonsmoking male groups. In conclusion, the serum levels of TG were more significantly influenced by factors tech as body weight, blood pressure, smoking and food & daily habit than those of Chol. Most of these influences were greater in males than in females.
Correlation of Rates of Solvolysis of Phenyl Chlorodithioformate
An, Sun-Kyoung,Yang, Jin-Soon,Cho, Jun-Mi,Yang, Ki-yull,Lee, Jong-Pal,Bentley, T.W.,Lee, Ik-choon,Koo, In-Sun Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.10
Solvolytic rate constants at 25 $^{\circ}C$ are reported for solvolysis of chlorodithioformate (1) in binary mixtures of water with acetone, ethanol, methanol, methanol-d, 50%methanol-d/50%D2O, and 2,2,2-trifluroethanol (TFE), and also in TFE-ethanol mixtures. The Grunwald-Winstein plot shows that the three aqueous mixtures exhibit dispersions into separate line. The correlation is improved only slightly by additional parameters NT for solvent nucleophilicity and/or I for aromatic ring parameter. Rate ratios in solvents of the same $Y_cl$ value, having different nucleophilicity provide measures of the minimum extent of nucleophilic solvent assistance, and the value of 3.35 for $[$k_{40EW}$/$k_97TFE$]_Y$ (EW = ethanol-water), is consistent with an essentially SN1 reaction mechanism. This study has shown that the magnitude of l, m and h values associated with a change of solvent composition is able to predict the SN1 reaction mechanism. log(k/$k_o$) = mY + lN + hI
Ab initio Studies on Acene Tetramers: Herringbone Structure
Park, Young-Hee,Yang, Ki-Yull,Kim, Yun-Hi,Kwon, Soon-Ki Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
The structures, energetics and transfer integrals of the acene tetramers up to pentacene are investigated with the ab initio molecular orbital method at the level of second-order Møller-Plesset perturbation theory (MP2). Calculated geometries for the herringbone-style structures found in the crystal structure were characterized as local minima, however the geometrical discrepancy between crystal and MP2 theoretical structure is reasonably small. The binding energy of pentacene tetramer was calculated up to 40 kcal/mol (MP2/6-31G(d)) and about 90 kcal/mol (MP2/aug-cc-pVDZ), and the latter seems to be too much overestimated. The tendency of the hole transfer integrals computed with ab initio MP2/3-21G(d) geometry is well agreement with those estimated with crystal structure with some discrepancy, and the gradual increment of the transfer integrals at the crystal geometry is attributed to mainly packing structure rather than the intrinsic property of acene such as a size of acene.