Use of Vitamins, Minerals, and Other Dietary Supplements by 17- and 18-Year-Old Students in Korea

김선효,Ji H. Han,Qin Yan Zhu,Carl L. Keen 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.1

Various types of dietary suplements (DS) are popularly taken by young individuals. We sur-veyed 1,190 Korean senior high school third grade students for their DS use, motivational fac-tors for this use, and potential dietary consequences of vitamin/mineral suplement (VMS)use. The use prevalence of DS including VMS, tonic medicines, manufactured health foodsuplements, cordial food suplements, and drink rehabilitators was 54%. VMS were takenmost frequently, followed by tonic medicines and manufactured health food suplements.VMS use was highest in individuals who had a significant concern for their overall healthand in those from families with a high socioeconomic level and with parental use of DS. To-tal daily study time of DS users was only slightly longer than that of nonusers. The VMSmost frequently used were vitamin C and multivitamins. More than 46% of other DS users,and 58% of VMS users, had increased their intake of suplements during third grade rela-tive to the previous year. VMS users had a more positive view of the potential health bene-fit of VMS than did nonusers. Vitamin and mineral intakes from VMS occurred over a widerange, with mean intakes typically exceeding the Korean and Canadian-U.S. RecommendedDietary Allowances. For a significant number of individuals, intakes of vitamin A, niacin,folic acid, vitamin C, calcium, iron, and zinc exceeded the Tolerable Uper Intake Levels.Given the widespread use of DS by older tenagers, the contribution of these suplementsto their overall health and well-being is a subject that clearly merits aditional study.27

국제경제 : 한국과 중국 은행산업의 효율성 영향요인에 관한 실증분석

제혜금 ( Hui Qin Zhu ),이명길 ( Ming Ji Li ) 국제지역학회 2012 국제지역연구 Vol.16 No.3

본 연구는 2000년대에 들어 한국의 은행 구조조정과 중국의 은행개혁의 성과를 비교분석해보고, 특히 중국 금융시장의 완전개방 시기를 맞아 한국 은행들의 경쟁력 존재여부 및 경쟁력 향상에 영향을 주는 요인을 도출해보고자 한다. 그리하여 본 연구는 중국의 15개 은행과 한국의 13개 은행을 대상으로 효율성을 측정하고, 은행효율성의 영향요인이 무엇인지 실증분석을 실시하였다. 연구결과와 시사점은 다음과 같다. 첫째, 국가별 효율성을 측정한 결과, 한국 상업은행들의 효율성이 중국 상업은행보다 높게 나타났지만, 중국 상업은행은 매년 증가세를 보이는 것으로 나타났다. 둘째, 은행 효율성의 영향요인이 무엇인지를 한국과 중국 전체표본으로 분석한 결과, 은행규모, 자산의 안정성, 소유권구조와 재무성과가 유의적인 것으로 나타났다. 셋째, 중국 은행효율성의 영향요인을 분석한 결과, 소유권구조, 금융중개비율, 자산의 건전성이 유의적인 요인으로 나타났다. 넷째, 한국 은행효율성의 영향요인을 분석한 결과, 재무성과와 자산의 안정성이 유의적인 요인으로 나타났다. 실증분석의 결과를 토대로 한국과 중국 은행산업의 현재 문제점을 규명할 수 있으며, 또한 한국의 은행, 정부에 은행산업에 경쟁력 향상을 위한 시사점을 제시하였다. This study have done comparative analysis of Korean banks` restructure and Chinese banks` reformation, especially derives main factors that influence existence and improvement of competitiveness of Korean banks. The study measured effectiveness of 15 Chinese banks and 13 Korean banks, and conducted empirical analysis of what are the factors affect the efficiency of banks. The result and implication are as follow. First, Korean commercial banks` efficiency is higher than banks in China, but Chinese commercial banks are getting better every year. Second, as the factors affect efficiency of the banks, it shows that the scale of bank, asset reliabilities, ownership structure and financial performance are significant. Third, about the factors affect efficiency, the ownership structure, financial intermediation ratio, and the health of the assets are significant in Chinese banks. Fourth, about the factors affect efficiency, the financial performance and asset reliability are significant in Korean banks. Based on the results, we have identified current problems of Chinese and Korean banks, and also pointed out Korean banks and Government how to improve competitiveness of Bank industry.

Zeolite-catalyzed Isomerization of 1-Hexene to trans-2-Hexene: An ONIOM Study

Li, Yan-Feng,Zhu, Ji-Qin,Liu, Hui,He, Peng,Wang, Peng,Tian, Hui-Ping Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.6

Details of the double-bond isomerization of 1-hexene over H-ZSM-5 were clarified using density functional theory. It is found that the reaction proceeds by a mechanism which involves the Br${\o}$nsted acid part of the zeolite solely. According to this mechanism, 1-hexene is first physically adsorbed on the acidic site, and then, the acidic proton transfers to one carbon atom of the double bond, while the other carbon atom of the double bond bonds with the Br${\o}$nsted host oxygen, yielding a stable alkoxy intermediate. Thereafter, the Br${\o}$nsted host oxygen abstracts a hydrogen atom from the $C_6H_{13}$ fragment and the C-O bond is broken, restoring the acidic site and yielding trans-2-hexene. The calculated activation barrier is 12.65 kcal/mol, which is in good agreement with the experimental value. These results well explain the energetic aspects during the course of double-bond isomerization and extend the understanding of the nature of the zeolite active sites.

Zeolite-catalyzed Isomerization of 1-Hexene to trans-2-Hexene: An ONIOM Study

Yan-Feng Li,Ji-Qin Zhu,Peng He,Peng Wang,Hui-Ping Tian,Hui Liu 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.6

Details of the double-bond isomerization of 1-hexene over H-ZSM-5 were clarified using density functional theory. It is found that the reaction proceeds by a mechanism which involves the Brønsted acid part of the zeolite solely. According to this mechanism, 1-hexene is first physically adsorbed on the acidic site, and then,the acidic proton transfers to one carbon atom of the double bond, while the other carbon atom of the double bond bonds with the Brønsted host oxygen, yielding a stable alkoxy intermediate. Thereafter, the Brønsted host oxygen abstracts a hydrogen atom from the C_6H_13 fragment and the C.O bond is broken, restoring the acidic site and yielding trans-2-hexene. The calculated activation barrier is 12.65 kcal/mol, which is in good agreement with the experimental value. These results well explain the energetic aspects during the course of double-bond isomerization and extend the understanding of the nature of the zeolite active sites.

MiR-494-3p Upregulation Exacerbates Cerebral Ischemia Injury by Targeting Bhlhe40

Lingjiang Sun,Dandan Ji,Feng Zhi,Yu Fang,Zigang Zhu,Tong Ni,Qin Zhu,Jie Bao 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.4

Purpose: Cerebral ischemia is related to insufficient blood supply and is characterized by abnormal reactive oxygen species(ROS) production and cell apoptosis. Previous studies have revealed a key role for basic helix-loop-helix family member e40 (Bhlhe40)in oxidative stress and cell apoptosis. This study aimed to investigate the roles of miR-494-3p in cerebral ischemia/reperfusion(I/R) injury. Materials and Methods: A mouse middle cerebral artery occlusion (MCAO/R) model was established to mimic cerebral ischemiain vivo. Brain infarct area was assessed using triphenyl tetrazolium chloride staining. Oxygen-glucose deprivation/reoxygenation(OGD/R) operation was adopted to mimic neuronal injury in vitro. Cell apoptosis was analyzed by flow cytometry. Therelationship between miR-494-3p and Bhlhe40 was validated by luciferase reporter and RNA immunoprecipitation assays. Results: Bhlhe40 expression was downregulated both in MCAO/R animal models and OGD/R-induced SH-SY5Y cells. Bhlhe40overexpression inhibited cell apoptosis and reduced ROS production in SH-SY5Y cells after OGD/R treatment. MiR-494-3p wasverified to bind to Bhlhe40 and negatively regulate Bhlhe40 expression. Additionally, cell apoptosis and ROS production in OGD/R-treated SH-SY5Y cells were accelerated by miR-494-3p overexpression. Rescue experiments suggested that Bhlhe40 could reversethe effects of miR-494-3p overexpression on ROS production and cell apoptosis. Conclusion: MiR-494-3p exacerbates brain injury and neuronal injury by regulating Bhlhe40 after I/R.

Efficacy evaluation of novel organic iron complexes in laying hens: effects on laying performance, egg quality, egg iron content, and blood biochemical parameters

Jiuai Cao,Jiaming Zhu,Qin Zhou,Luyuan Zhao,Chenhao Zou,Yanshan Guo,Brian Curtin,Fei Ji,Bing Liu,Dongyou Yu Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.3

Objective: This study was conducted to determine the optimal dose of novel iron amino acid complexes (Fe-Lys-Glu) by measuring laying performance, egg quality, egg iron (Fe) concentrations, and blood biochemical parameters in laying hens. Methods: A total of 1,260 18-week-old healthy Beijing White laying hens were randomly divided into 7 groups with 12 replicates of 15 birds each. After a 2-wk acclimation to the basal diet, hens were fed diets supplemented with 0 (negative control, the analyzed innate iron content was 75.06 mg/kg), 15, 30, 45, 60, and 75 mg Fe/kg as Fe-Lys-Glu or 45 mg Fe/kg from FeSO₄ (positive control) for 24 wk. Results: Results showed that compared with the negative and positive control groups, dietary supplementation with 30 to 75 mg Fe/kg from Fe-Lys-Glu significantly (linear and quadratic, p<0.05) increased the laying rate (LR) and average daily egg weight (ADEW); hens administered 45 to 75 mg Fe/kg as Fe-Lys-Glu showed a remarkable (linear, p<0.05) decrease in feed conversion ratio. There were no significant differences among all groups in egg quality. The iron concentrations in egg yolk and serum were elevated by increasing Fe-Lys-Glu levels, and the highest iron content was found in 75 mg Fe/kg group. In addition, hens fed 45 mg Fe/kg from Fe-Lys-Glu had (linear and quadratic, p<0.05) higher yolk Fe contents than that with the same dosage of FeSO₄ supplementation. The red blood cell (RBC) count and hemoglobin content (linear and quadratic, p<0.05) increased obviously in the groups fed with 30 to 75 mg Fe/kg as Fe-Lys-Glu in comparison with the control group. Fe-Lys-Glu supplementation also (linear and quadratic, p<0.05) enhanced the activity of copper/zinc-superoxide dismutase (Cu/Zn-SOD) in serum, as a result, the serum malonaldehyde content (linear and quadratic, p<0.05) decreased in hens received 60 to 75 mg Fe/kg as Fe-Lys-Glu. Conclusion: Supplementation Fe-Lys-Glu in laying hens could substitute for FeSO₄ and the optimal additive levels of Fe-Lys-Glu are 45 mg Fe/kg in layers diets based on the quadratic regression analysis of LR, ADEW, RBC, and Cu/Zn-SOD.