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Water-based polyurethane dispersions: chemistry, technology and applications

Over the past few decades, polyurethane-polyurea aqueous dispersions (PUDs) have developed a solid reputation for high performance applications, particularly in the field of adhesives and coatings. PUDs are mostly environmentally compatible products; they are totally devoid or contain only low amounts of volatile organic compounds (VOC). This is an important feature in view of the present environmental policies...

A comparative analysis of the antibiofilm properties of crude blueberry extract...

Impact of processing upon dry blueberry fruit aqueous extracts

Solvent-free aqueous polyurethane dispersions

The industrial production of aqueous polyurethane dispersions (PUDs) is nowadays a well established technology. There are two main synthetic routes to produce PUDs: the acetone process (a former process developed by Bayer AG) and the pre-polymer process (developed as an alternative response to the patented acetone process). Comparatively to the acetone process, the pre-polymer process has one major advantage si...

Solvent-free aqueous polyurethane dispersions

The industrial production of aqueous polyurethane dispersions (PUDs) is nowadays a well established technology. There are two main synthetic routes to produce PUDs: the acetone process (a former process developed by Bayer AG) and the pre-polymer process (developed as an alternative response to the patented acetone process). Comparatively to the acetone process, the pre-polymer process has one major advantage si...

Avaliação dos níveis de radioactividade natural em águas subterrâneas da região...

Determinaram-se as concentrações de 222Rn, 226Ra, 234U e 238U em águas subterrâneas numa área de substrato granítico-metassedimentar (Horta da Vilariça, Torre de Moncorvo). 30% das amostras ultrapassam os limites recomendados para a concentração de radão em águas de consumo e 65% para as concentrações de U. Em consequência, em ca. 60% dos casos a exposição a radiações ionizantes ultrapassa largamente o valor li...

Synthesis, characterization and biodistribution of bisphosphonates Sm-153 compl...

Bisphosphonates (BPs) are characterized by a P-C-P backbone structure and two phosphonic acid groups bonded to the same carbon, and are established as osteoclast-mediated bone resorption inhibitors. The nature of the groups attached to the central carbon atom are responsible in determining the potency of bisphosphonates as anti-resorption drugs. However, it is not yet clear the exact relationship between their ...

Comparação de duas soluções extratoras na resolução de cinco sistemas enzimátic...

1999

Blood culture as a parameter of treatment effectiveness in experimental histopl...

The aim of this study was to determine the value of blood culture as a parameter of treatment effectiveness in experimental histoplasmosis. A total of thirty five hamsters, weighing approximately 120g, were inoculated intracardiacly with 0.1 ml of a suspension containing 4 x 10(7) cells/ml of the yeast phase of H. capsulatum. Treatments were started one week after the infection and lasted for 3 weeks. The azole...

Estudio comparativo de la patogenicidad y la antigenicidad de 6 cepas de Paraco...

Fueron estudiadas en forma comparativa 6 cepas de P. brasiliensis con el propósito de determinar su patogenicidad para la rata y su antigenicidad. Las mismas fueron aisladas de : 1) biopsia de cuello uterino en 1989 (U), 2) biopsia de mucosa bucal en 1988 (V), 3) aspiración ósea en 1991 (63265), 4) testículo de cobayo 1984(C24), 5) punción-aspiración ganglionaren 1986 (G) y 6) cepa proveniente de la Escola Paul...