However, with increasing cobalt concentration Selleckchem 4-Hydroxytamoxifen a decrease in the optical band gap, from 2.39 to 2.26 eV, is observed. This reduction is addressed on the
basis of band tailing due to the creation of localized energy states in association with Urbach energy calculations. In addition, implantation gives rise to grain growth and increase in the surface roughness. Size and shape fluctuations of individual CdS grains, at higher fluences, give rise to inhomogeneity in strain. The results are discussed in the light of ion-matter interaction in the keV regime. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3224867]“
“Thermoplastic-toughened epoxy resins are widely used as matrices in modern composite prepreg systems. Rapid curing of thermoplastic-toughened epoxy matrix composites results in different mechanical properties. To investigate CX-4945 the structure-property relationship, we investigated a poly(ether sulfone)-modified triglycidylaminophenol/4,4′-diamino diphenyl sulfone system that was cured at different heating rates. An intermediate dwell was also applied during the rapid heating of the thermoplastic-modified epoxy system. We found that a higher heating rate led to a larger domain size of the phase-seperated macrostructure and also facilitated
more complete phase seperation. The intermediate dwell helped phase seperation to proceed even further, leading to an even larger domain size of the macrostructure. A carbon-fiber-reinforced polymer matrix composite prepreg JNK inhibitor research buy based on the poly(ether sulfone)-modified multifunctional epoxy system was cured with the same schedule. The rapidly heated composite laminates exhibited higher mode I delamination. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 485-491, 2009″
“Polymorphisms of PRNP gene have been strongly correlated to the susceptibility/resistance to scrapie in sheep. Variants at the coding
positions 136, 154 and 171 have been the most frequently associated to susceptibility to classical scrapie. The aim of this study was to estimate PRNP haplotype and genotype frequencies in a sample of 1400 sheep from 13 different breeds that are representative of the main production regions in Brazil. A total of four different alleles (ARR, ARQ AHQ and VRQ) and nine genotypes were observed at different frequencies among the investigated breeds. There were distinct patterns of allelic distribution between naturalized and commercial/specialized breeds and different geographic regions. These results will influence the development and management of breeding and conservation programs and will help to develop Brazilian efforts to avoid scrapie epidemics. (C) 2011 Elsevier Ltd. All rights reserved.