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Analytic treatment of distributions of lithium neutrals and ions in linear devices
Chung, K.S.,Hirooka, Y.,Ashikawa, N.,Cho, S.G.,Choi, H.G.,Kang, I.J.,Tsuchiya, H. North-Holland 2017 Fusion engineering and design Vol.119 No.-
<P>Neutral lithium (Li) has been used for the mitigation of heat flux to the plasma facing components and for the control of hydrogen of fusion plasmas. Radial and axial variations of densities of Li neutrals and ions are obtained analytically for a cylindrical chamber by assuming the classical diffusion with or without the magnetic field (B). Neutrals and ions without B can be expressed as a linear combination of the modified Bessel functions of order zero (I-0 and K-0), while ions with B are to be expressed as the square root of them. Analytical solutions of Li neutral densities with Dirichlet and Neumann boundary conditions are compared to those using Monte Carlo simulation and experimental values of the LIGHT-1 (Lithium Injection Gettering of Hydrogen and its Transport experiments) device. Proper combinations of the relaxation length and size of the source would produce well fitted profiles similar to those observed experimentally and those using Monte Carlo codes. (C) 2017 Elsevier B.V. All rights reserved.</P>
Contribution of a Non-classical HLA Gene, HLA-DOA, to the Risk of Rheumatoid Arthritis
Okada, Y.,Suzuki, A.,Ikari, K.,Terao, C.,Kochi, Y.,Ohmura, K.,Higasa, K.,Akiyama, M.,Ashikawa, K.,Kanai, M.,Hirata, J.,Suita, N.,Teo, Y.Y.,Xu, H.,Bae, S.C.,Takahashi, A.,Momozawa, Y.,Matsuda, K.,Momoh University of Chicago Press [etc.] 2016 American journal of human genetics Vol.99 No.2
<P>Despite the progress in human leukocyte antigen (HLA) causal variant mapping, independent localization of major histocompatibility complex (MHC) risk from classical HLA genes is challenging. Here, we conducted a large-scale MHC fine-mapping analysis of rheumatoid arthritis (RA) in a Japanese population (6,244 RA cases and 23,731 controls) population by using HLA imputation, followed by a multi-ethnic validation study including east Asian and European populations (n=7,097 and 23,149, respectively). Our study identified an independent risk of a synonymous mutation at HLA-DOA, a non-classical HLA gene, on anti-citrullinated protein autoantibody (ACPA)-positive RA risk (p=1.4 x 10(-) 9), which demonstrated a cis-expression quantitative trait loci (cis-eQTL) effect on HLA-DOA expression. Trans-ethnic comparison revealed different linkage disequilibrium (LD) patterns in HLA-DOA and HLA-DRB1, explaining the observed HLA-DOA variant risk heterogeneity among ethnicities, which was most evident in the Japanese population. Although previous HLA fine-mapping studies have identified amino acid polymorphisms of the classical HLA genes as driving genetic susceptibility to disease, our study additionally identifies the dosage contribution of a non-classical HLA gene to disease etiology. Our study contributes to the understanding of HLA immunology in human diseases and suggests the value of incorporating additional ancestry in MHC fine-mapping.</P>