This makes it a potential candidate as back contact Cell Cycle inhibitor material for CdTe thin film solar cells. The interface was investigated by stepwise in situ deposition of NbSe2 and subsequent characterization with x-ray and ultraviolet photoemission spectroscopy. The experiments showed that Te and Se interdiffuse at the interface, causing the formation of a graded diffusion layer. The resulting band alignment indicates the formation of an interface dipole leading to a midband gap alignment of the NbSe2 Fermi level. (C) 2011 American Institute of Physics.

[doi: 10.1063/1.3533424]“
“The frequencies of alternative synonymous codons vary both among species and among genes from the same genome. These patterns have been inferred to reflect the action of natural selection. Here we evaluate this in bacteria. While intragenomic variation in many species is consistent with selection favouring translationally optimal codons, much of the variation among species appears to be due to biased patterns of mutation. The strength of selection on codon usage can be estimated by two different selleck products approaches.

First, the extent of bias in favour of translationally optimal codons in highly expressed genes, compared to that in genes where selection is weak, reveals the long-term effectiveness of selection. Here we show that the strength of selected codon usage bias is highly correlated with bacterial growth rate, suggesting that selection has favoured translational efficiency. Second, the pattern of bias towards optimal codons at polymorphic sites reveals the ongoing

action of selection. Using this approach we obtained results that were completely consistent with the first method; importantly, this website the frequency spectra of optimal codons at polymorphic sites were similar to those predicted under an equilibrium model. Highly expressed genes in Escherichia coli appear to be under continuing strong selection, whereas selection is very weak in genes expressed at low levels.”
“The first principles calculations based on density functional theory are performed to investigate the mechanical properties and chemical bonding features of several Cr7C3 type multicomponent carbides (Fe16Cr12C12, Fe12Cr12W4C12, Fe12Cr12Mo4C12, Fe12Cr12W4C8B4, and Fe12Cr12Mo4C8B4). The full set elastic constants are calculated using stress-strain method. The Voigt-Reuss-Hill approximation is used to evaluate the mechanical moduli. The mechanical anisotropy is characterized by calculating several different anisotropic indexes and factors, such as universal anisotropic index (A(U)), shear anisotropic factors (A(1), A(2), and A(3)), and percent anisotropy (A(B) and A(G)). The surface constructions of bulk and Young’s moduli are illustrated to indicate the mechanical anisotropy. The obtained results indicate that the presence of B could deteriorate the mechanical moduli of (Fe, Cr)(7)C-3 phase in Cr cast iron slightly.