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Effects of Sb-Incorporation on the 2223 Phase in the Superconducting Bi-Pb-Sr-Ca-Cu-O System
Seong Han Kim,Dong Hoon Lee,Jong Sik Park,Seung Koo Cho,Sung Han Lee,Keu Hong Kim Korean Chemical Society 1994 Bulletin of the Korean Chemical Society Vol.15 No.2
Samples of ($Bi_{2-x}Sb_x)PbSr_2Ca_2Cu_3O_y$, compositions with x=0.0, 0.1, and 0.2 were prepared by solid-state reaction. The solubility of Sb into the 2223 phase is lower than 0.05 for the ratio of Sb/Bi. The lack of stability of the Sb-substituted $Bi_2O_2$ double layers is likely to cause the solubility low. There is no great dependence of lattice parameters on the Sb-content, and bonds around the square-pyramidal Cu atom are not affected by the $Sb^{3+}$ ion substituted. The superconducting transition temperature of this system is decreased gradually with increase of Sb, which is tentatively attributable to the perturbation of the Bi 6p-O 2p band and/or to the low volume fraction of the 2223 phase.
Seonghan Kim,장락우 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.7
Full atomistic molecular dynamics simulations have been performed for model mixture bilayer membrane systems consisting of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) phospholipids to understand the effects of two essential parameters such as lipid composition and temperature on the structural, dynamical, and phase behavior of mixture membrane systems. Although pure DSPC membranes are in the gel-like (Lβ ′ or P β ′) phase at 323 K, raising the temperature by only 10 K or replacing 20% of DSPC lipids by DOPC lipids can change the gel-like phase into the completely liquid-crystalline phase (L α ). This phase change is accompanied by dramatic change in both structural properties such as area per lipid, membrane thickness, deuterium order parameter, and tail angle distribution, and dynamics properties such as mobility map. We also observe that the full width at half-maximum (FWHM) data of tail angle distribution as well as area per lipid (or membrane thickness) can be used as order parameters for the membrane phase transition.
( Seong Han Kim ),( Seo Yeon Yang ),( Jihong You ),( Sang Bae Lee ),( Jin You ),( Yoon Soo Chang ),( Hyung Jung Kim ),( Chul Min Ahn ),( Min Kwang Byun ),( Hye Jung Park ),( Jung-won Park ) 대한결핵 및 호흡기학회 2016 Tuberculosis and Respiratory Diseases Vol.79 No.4
Background: Specific immunoglobulin E (IgE) sensitization to staphylococcal enterotoxin (SE) has been recently considered to be related to allergic disease, including asthma. Despite studies on specific IgE (sIgE) to SE and its relationship to asthma diagnosis and severity, the association of sIgE to SE with airway hyperresponsiveness (AHR) remains unclear. Methods: We enrolled 81 asthma patients admitted to the Severance Hospital in Korea from March 1, 2013, to February 28, 2015 and retrospectively reviewed the electronic medical records of the enrolled subjects. The serum levels of sIgE to SE (A/ B) of all subjects was measured using the ImmunoCAP 250 (Phadia) system with SE-sIgE positive defined as >0.10 kU/mL. Results: The SE-sIgE level was not significantly correlated with asthma severity (forced expiratory volume in 1 second [FEV<sub>1</sub>], FEV<sub>1</sub>/forced vital capacity, sputum eosinophils, and serum eosinophils), whereas the SE-sIgE level in patients with positive AHR (mean±standard error of the mean, 0.606±0.273 kU/mL) was significantly higher than that in patients with negative AHR (0.062±0.015 kU/mL, p=0.034). In regression analysis, SE sensitization (sIgE to SE ≥0.010 kU/mL) was a significant risk factor for AHR, after adjustment for age, sex, FEV<sub>1</sub>, and sputum eosinophils (odds ratio, 7.090; 95% confidence interval, 1.180-42.600; p=0.032). Prevalence of SE sensitization was higher in patients with allergic rhinitis and non-atopic asthma patients, as compared to patients without allergic rhinitis and atopic asthma patients, respectively, but without statistical significance. Conclusion: SE sensitization is significantly associated with AHR.
S-331 Low Intake of Vitamin C is Significantly Associated with Chronic Obstructive Pulmonary Disease
( Seong Han Kim ),( Jae Yeol Kim ),( Jae-woo Jung ),( In-won Park ),( Yu-il Kim ),( Kwang-ha Yoo ),( Eun Mi Chun ),( Ji Ye Jung ),( Young Sik Park ),( Ju-heon Park ),( Chul Min Ahn ),( Hye Jung Park ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background: Vitamin C, as a antioxidant, has been recently suggested to be associated with chronic obstructive pulmonary disease (COPD). Large cohort study about the association of vitamin C with COPD independent of smoking history is needed. Methods: We analyzed the data of 5,592 subjects who answered to questions about smoking history, with stratification variables and sampling weight designated by the Korea 2012 National Health and Nutrition Examination Survey. Results: Heavier smoking history was associated with male, old age, Eup/Myun residence, general type of residence, low household income, low level of education, and occupation. The concentration of Pb and Hg was significantly higher in heavy smokers (3.6 and 6.6, respectively) than that in never smokers (2.2 and 4.0, respectively) (<0.001 in both of them). In COPD subjects, amount of food, kalium, vitamin, carotene, and retinol intake was significantly lower than that in non-COPD subjects. The amount of vitamin C intake (mg) was significantly lower in COPD (93.2±3.9) than that in non-COPD (122.1±4.0) (p<0.001). In multivariate analysis, sex, age, smoking history, and amount of vitamin C intake was independent and significant risk factors for COPD. In heavy smoker, prevalence of COPD in lowers quartile of vitamin C intake (63.0%) was significantly higher than that in upper middle quartile of vitamin C intake (29.5%) (p=0.015), (Fig. 1). Conclusions: Low intake of vitamin C is a significant risk factor for COPD independent of smoking history.