The inoculated rubber showed a stable value for the number-average buy P005091 molar mass (M), in contrast to the noninoculated samples, for which an increase in M during maturation was observed. The quantity of microorganisms significantly affected the physical properties and structure of the processed dry rubber. The mechanisms occurring during the initial stage of maturation are complex, and microorganisms are involved not only in the increase in sensitivity to thermooxidation but also in the crosslinking phenomenon between isoprene chains. (C) 2010 Wiley Periodicals,

Inc. J Appl Polym Sci 118: 1341-1348, 2010″
“The effect of temperature on Burkholderia cepacia lipase (Amano PS) activity and enantioselectivity in the kinetic resolution of mandelic acid has been investigated. Experiments were carried out at temperatures between 25 and 60 degrees C. The Bi Bi Ping Pong model has been used to calculate kinetic parameters of the transesterification of mandelic acid by vinyl acetate. The rate of transesterification of R enantiomer was found to be substantially lower than that of S enantiomer. A decrease in the reaction rates was observed in temperature above 55 degrees C. The equilibrium

model of enzyme deactivation was used to describe the dependence of mandelic acid transesterification rate on temperature. The enthalpy and entropy of the enzyme inactivation have TH-302 purchase been estimated. The enantioselectivity, expressed as enantiomeric ratio (eta(E)), was very

high and decreased a little with the temperature increase. The transition state theory was used to determine the thermodynamic activation parameters. The (S)-mandelic acid transesterification has been found to be enthalpically and entropically favoured. The differentiation of mandelic acid enantiomers in the reaction conditions is driven by the difference in activation enthalpy and entropy as well as by the energy of the substrate binding. (C) 2009 Elsevier B.V. All rights reserved.”
“New substructures of H4 and H5 hole traps have been revealed using Laplace deep-level transient spectroscopy. Our measurements show that the hole traps H4 and H5 can have at least three components for each. Moreover, the activation energies are deduced and the microscopic nature of these substructures SN-38 datasheet is discussed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3478744]“
“Polymer dispersed liquid crystal (PDLC) films are fabricated using E7 liquid crystals, tetraethylene glycol diacrylate (TeGDA) crosslinking agent, and 0-66.49 mol % 2-hydroxy ethyl methacrylate (HEMA). The effects of different levels of HEMA addition on the microstructure and electro-optical properties of the PDLC samples are examined using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and UV-Vis spectroscopy, respectively. The results show that the refractive index of the PDLC films is insensitive to the level of HEMA addition.