Browsing by Author "Zhang, Li"

Now showing 1 - 3 of 3

A QUASICLASSICAL TRAJECTORY STUDY OF REACTIVE SCATTERING ON AN ANALYTICAL POTENTIAL ENERGY SURFACE FOR GeH(2) SYSTEM
(2011-04-01)
Zhang, Li
;
Zhu, Chao-Yong
;
Jiang, Gang
;
Zhu, Chaoyuan
;
Zhu, Z. H.
A quasiclassical trajectory method was employed to study reaction Ge + H(2) (v = 0, j = 0) and reverse reaction H + GeH (v = 0, j = 0) on an analytical potential energy surface obtained from simplified many-body expansion method with fitting to B3P86/CC-pVTZ calculations around a global minimum and a long-range van de Waals well plus spectroscopy data for diatomic molecules GeH and H(2). Reaction probabilities from both reaction and reverse reaction were calculated. Dominant reaction is complex-forming reaction Ge + H(2) (v = 0, j = 0) -> GeH(2), and its cross section is 10 times bigger than that of complex-forming reaction from the reverse reaction. There is no threshold effect for complex-forming reaction and the cross sections for both complex-forming reactions decrease with the increase of collision energy. Life time of complex is shown to be decreasing with increase of collision energy. Dominant reverse reaction is reaction H + GeH (v = 0, j = 0) -> Ge + H(2); the reaction probability decreases with the increase of collision energy and differential cross section shows that this reverse reaction has almost equal angular distribution at low collision energy and mostly forward scattering at high collision energy.
A QUASICLASSICAL TRAJECTORY STUDY OF REACTIVE SCATTERING ON AN ANALYTICAL POTENTIAL ENERGY SURFACE FOR GeH2 SYSTEM
(2011-04-01)
Zhang, Li
;
Zhu, Chao-Yong
;
Jiang, Gang
;
Zhu, Chaoyuan
;
Zhu, Z. H.
A quasiclassical trajectory method was employed to study reaction Ge + H-2 (v = 0, j = 0) and reverse reaction H + GeH (v = 0, j = 0) on an analytical potential energy surface obtained from simplified many-body expansion method with fitting to B3P86/CC-pVTZ calculations around a global minimum and a long-range van de Waals well plus spectroscopy data for diatomic molecules GeH and H-2. Reaction probabilities from both reaction and reverse reaction were calculated. Dominant reaction is complex-forming reaction Ge + H-2 (v = 0, j = 0) -> GeH2, and its cross section is 10 times bigger than that of complex-forming reaction from the reverse reaction. There is no threshold effect for complex-forming reaction and the cross sections for both complex-forming reactions decrease with the increase of collision energy. Life time of complex is shown to be decreasing with increase of collision energy. Dominant reverse reaction is reaction H + GeH (v = 0, j = 0) -> Ge + H-2; the reaction probability decreases with the increase of collision energy and differential cross section shows that this reverse reaction has almost equal angular distribution at low collision energy and mostly forward scattering at high collision energy.
Meta-analysis of Dense Genecentric Association Studies Reveals Common and Uncommon Variants Associated with Height
(2011-01-07)
Lanktree, Matthew B.
;
Guo, Yiran
;
Murtaza, Muhammed
;
Glessner, Joseph T.
;
Bailey, Swneke D.
Height is a classic complex trait with common variants in a growing list of genes known to contribute to the phenotype. Using a genecentric genotyping array targeted toward cardiovascular-related loci, comprising 49,320 SNPs across approximately 2000 loci, we evaluated the association of common and uncommon SNPs with adult height in 114,223 individuals from 47 studies and six ethnicities. A total of 64 loci contained a SNP associated with height at array-wide significance (p < 2.4 x 10(-6)), with 42 loci surpassing the conventional genome-wide significance threshold (p < 5 x 10(-8)). Common variants with minor allele frequencies greater than 5% were observed to be associated with height in 37 previously reported loci. In individuals of European ancestry, uncommon SNPs in IL11 and SMAD3, which would not be genotyped with the use of standard genome-wide genotyping arrays, were strongly associated with height (p < 3 x 10(-11)). Conditional analysis within associated regions revealed five additional variants associated with height independent of lead SNPs within the locus, suggesting allelic heterogeneity. Although underpowered to replicate findings from individuals of European ancestry, the direction of effect of associated variants was largely consistent in African American, South Asian, and Hispanic populations. Overall, we show that dense coverage of genes for uncommon SNPs, coupled with large-scale meta-analysis, can successfully identify additional variants associated with a common complex trait.