“New processes for synthesis of urea-formaldehyde (UF) and


“New processes for synthesis of urea-formaldehyde (UF) and melamine-fortified urea-formaldehyde (mUF) resins have been developed in the last years, motivated by the current concerns about the effects of formaldehyde on human health. All these formulations are quite susceptible to possible operation error, which can significantly influence the characteristics of the final product. The main objective of this work was to implement chemometric techniques for off-line monitoring of the product’s formaldehyde/urea

(F/U) molar ratio using near infrared (NIR) spectroscopy. This allows GSK2126458 the timely implementation of the necessary corrections in case the product is off-specification. Calibration models for

F/U molar ratio were developed taking into account the most relevant spectral regions for these resins, individually or in combination (7502-6098 cm(-1) and 5000-4246 cm(-1)) and using different preprocessing methods. When the appropriate spectral range and preprocessing methods are selected, it is possible to obtain calibration models with high correlation values for these resins. The best preprocessing methods were identified for three cases: UF resin (produced by strongly-acid process), mUF resin (alkaline-acid process), and a combined model that involves both UF and mUF resins. It was concluded that significantly better accuracy is obtained when a new model is developed for each particular resin system. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012″
“Purpose of review

Trauma-induced

VX-661 solubility dmso coagulopathy results from a complex interplay between shock resuscitation and impaired clotting protease function. A pathophysiological role of platelets PCI-34051 in this condition remains as yet undefined. This review examines our current knowledge of platelet function in haemostasis, possible mechanisms for aberrant activity in trauma and the role of platelet transfusions in exsanguinating haemorrhage.

Recent findings

Platelet adhesion and aggregation enable a haemostatic plug to form at the site of vessel injury. As described within cell-based models of thrombin generation, platelet membranes provide a platform to amplify clot formation. There is evidence to suggest platelet activity may be of greater importance than platelet number for clot integrity. Analysis of platelet function is limited by currently available devices. Therefore, the precise role and triggers for platelet transfusion in trauma have yet to be fully characterized. Retrospective studies show that early high-volume platelet transfusion in trauma may be associated with similar outcome benefits observed in high ratio plasma: red blood cell replacement.

Summary

Platelets undoubtedly play a pivotal role in haemostasis and trauma-induced coagulopathy. However, their specific dysfunction in trauma remains to be elucidated.

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