Finer geometries, such as powders, were found to have higher moisture absorption rates due to their large surface area although they could also be easily dried. Furthermore,

large surface area of fine powder as well as good interaction between RPP disperse particles and RPET matrix eased to decompose in the presence of oxygen thus accelerated chain breaking during thermal oxidative degradation especially at low heating rate. Meanwhile, larger pellets exhibited higher degradation activation energies, which suggest that they are more resistant to thermal degradation than smaller grains. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012″
“Effect of ambient gases present in air on photoluminescence (PL) and electrical conductivity of films prepared using ZnO nanoparticles (NPs) have been investigated. It is observed that NPs of check details size below 20 nm kept inside a chamber exhibit complete reduction R788 cost in their visible PL when oxygen partial pressure of the surrounding gases

is decreased by evacuation. However, the visible PL from ZnO NPs is insensitive to other major gases present in the ambient air. The rate of change of PL intensity with pressure is inversely proportional to the ambient air pressure and increases when particle size decreases due to the enhanced surface to volume ratio. On the other hand, an assembly of ZnO NPs behaves as a complete insulator in the presence of dry air and its major components like N(2), O(2),

and CO(2). Electrical conduction having resistivity similar to 10(2)-10(3) Omega m is observed in the presence of humid air. The P505-15 clinical trial depletion layer formed at the NP surface after acquiring donor electrons of ZnO by the adsorbed oxygen has been found to control the visible PL and increases the contact potential barrier between the NPs which in turn enhances the resistance of the film. (C) 2011 American Institute of Physics. [doi:10.1063/1.3632059]“
“Background: Pancreatic anastomotic leak is one of the most serious complications following pancreaticoduodenectomy (PD). Various factors have been implicated as contributors to pancreatic anastomotic leaks, the incidence of which has been as high as 28% in some series.

Objectives: We describe technical modifications to Cattell’s technique for pancreaticojejunostomy (PJ), with buttressing of ‘soft’ pancreases and use of an isolated biliopancreatic loop for reconstruction following a PD.

Methods: We report our early experience using this technique in 50 patients who underwent PD between May 2002 and June 2006.

Results: There was no mortality in our series. The postoperative morbidity rate was 32% (16/50), with major complications occurring in seven (14%) patients. Pancreatic leak occurred in one patient (2%) and bile leak in one patient (2%). Both patients were managed conservatively.