The objective of this study was to verify the efficacy of cotton fabric, made of serge bonding 2 x 1, as microbial barrier, when new and after multiple laundering and steam sterilization procedures. The power of the microbial barrier was correlated with physical characteristics of the fabric, using standard test methods for evaluation of weight, traction, stretching tearing resistance and microbiological characteristics. The microbiological results evidenced that the microbial barrier was effective when the wrapping material was new or went through a maximum of new 65 reprocessing procedures. As for the alterations in the physical characteristics of the reprocessed material, the decrease in weight seemed to be the event responsible for microbial barrier breaking. The timing of detected alterations in bursting, traction and stretching in the wrap and the reprocessed fabrics did not coincide with the moment of bacterial barrier breaking. The present investigation corroborates that the use double cotton fabric, for wrapping medical and hospital items for steam sterilization, is safe. Re-use number must be controlled, not exceeding 65 times.
1 -Conceituação : -Primariamente a obesidade pode ser con sirierada como o desequilíbrio entre ingestão e queima de calorias. Alguns dos estudiosos do assunto ainda a consideram como proble ma comum das classes abastadas e das sociedades de elevado padrão de vida; isso porque achados históricos revelam que nos períodos de abastança, os casos de obesos eram frequentes em contraposição com os períodos de crises políticas, guerras, cataclismas. Quando os alimentos se tornavam escassos ou de difícil aquisição os casos de obesos também diminuíram. A determinação do excesso de peso é feita por meio de tabelas , se bem que com sérias limitações, visto que fatores biotipOlógicos devem ser considerados e uma tabela pa drão deixaria de ser exata ; contudo, os "experts" do assunto par tem da premissa de que um padrão de referência peso ideal ou desej ável, mesmo na época atual, a tabela ainda é ��tJ,strumento valioso, na determinação da obesidade.Sendo assim. alguns autores definem a o b �ade como o ex cesso de 15% do peso ideal ou desej ável. . Segundo outros, o excesso de peso é consi � o obesidade se atingir 20% sobre o ideal ou desej ável.Outros há que precisam com exatidão, situando o problema na seguinte escala : -20% sobre pesà ideal ou desej ável nos adolescentes do sexo feminino ; *
The tensile strength of Portland cement may be increased by additional reinforcement. This is usually accomplished by means of steel rods, fibers or particles, which are mixed to the slurry. In an attempt of increasing toughness and tensile strength of hardened cement pastes, the present work describes the behavior of composites consisting of Portland reinforced by natural polymer particles for oil well cementing. The main purpose of the study was to select plastic and environmentally friendly powdered materials capable of filling the typical porosity developed on hardened Portland cement. Preliminary results suggested that the tensile strength of plain Portland hardened slurries could be increased by as much as 40% by adding 10% of reinforcement.
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