Bacterial Inactivation
Mostrando 25-36 de 435 artigos, teses e dissertações.
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25. Solar Disinfection Evaluation and its Social Viability at State of Ceará, Brazil / Avaliação do Processo de Desinfecção Solar (SODIS) e de sua Viabilidade Social no Estado do Ceará
Despite the importance of sanitation for well-being of the mankind and the natural resources conservation, still today a large number of people do not have access to wastewater system neither to public water supply. One technique which has being studied and applied in developing countries as a safe household water treatment method is solar disinfection, SODI
Publicado em: 2006
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26. High pressure-sensitive gene expression in Lactobacillus sanfranciscensis
Lactobacillus sanfranciscensis is a Gram-positive lactic acid bacterium used in food biotechnology. It is necessary to investigate many aspects of a model organism to elucidate mechanisms of stress response, to facilitate preparation, application and performance in food fermentation, to understand mechanisms of inactivation, and to identify novel tools for h
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-08
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27. Development of thermal process otmized for mosto sugar canes in alcoholic fermentation / Desenvolvimento de processo termico otimizado para mosto de caldo de cana na fermentação alcoolica
In this research is proposed a thermal treatment process for sugar cane must with maximum retention of fermentable sugar (sucrose, glucose and fructose), to promote a thermal inactivation of its bacterial contaminants and therefore, those of alcoholic fermentation. With this objective were examined the thermo degradation kinetics of sucrose, glucose, fructos
Publicado em: 2005
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28. Visualization and Modelling of the Thermal Inactivation of Bacteria in a Model Food
A large number of incidents of food poisoning have been linked to undercooked meat products. The use of mathematical modelling to describe heat transfer within foods, combined with data describing bacterial thermal inactivation, may prove useful in developing safer food products while minimizing thermal overprocessing. To examine this approach, cylindrical a
American Society for Microbiology.
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29. Tolerance of Staphylococcal Thermonuclease to Stress
Remarkable tolerance to prolonged heating, prolonged storage, and bacterial proliferation was exhibited by staphylococcal thermonuclease in foods and broth. A purified enzyme preparation added to Brain Heart Infusion broth was unaffected by the growth of five bacterial species. Minimal inactivation was effected by Bacillus subtilis. Optimal growth of Strepto
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30. Survival of Bacterial Indicator Species and Bacteriophages after Thermal Treatment of Sludge and Sewage
The inactivation of naturally occurring bacterial indicators and bacteriophages by thermal treatment of a dewatered sludge and raw sewage was studied. The sludge was heated at 80°C, and the sewage was heated at 60°C. In both cases phages were significantly more resistant to thermal inactivation than bacterial indicators, with the exception of spores of sul
American Society for Microbiology.
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31. Increased inactivation of Saccharomyces cerevisiae by protraction of UV irradiation.
The principle of equi-effectivity of the product of intensity and exposure time (principle of Bunsen-Roscoe) of UV irradiation has been assumed to be valid for the inactivation of microorganisms in general. Earlier studies claimed higher survival of Escherichia coli B/r with fractionated irradiation compared with single-exposure survival. However, data on th
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32. Penicillin-binding protein inactivation by human neutrophil myeloperoxidase.
Myeloperoxidase (MPO), H2O2, and chloride comprise a potent antimicrobial system believed to contribute to the antimicrobial functions of neutrophils and monocytes. The mechanisms of microbicidal action are complex and not fully defined. This report describes the MPO-mediated inactivation, in Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginos
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33. Inactivation of the Lipid-Containing Bacteriophage PM2 by Butylated Hydroxytoluene
Several factors have been investigated which are of significance in the inactivation of PM2, a lipid-containing bacterial virus, by butylated hydroxytoluene (BHT). Studies of the time dependence of inactivation during exposure to BHT showed that virus killing occurs rapidly, with the majority of the effect taking place in the first 5 min. The degree of inact
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34. Inactivation of a Pseudomonas aeruginosa quorum-sensing signal by human airway epithelia
Mammalian airways protect themselves from bacterial infection by using multiple defense mechanisms including antimicrobial peptides, mucociliary clearance, and phagocytic cells. We asked whether airways might also target a key bacterial cell-cell communication system, quorum-sensing. The opportunistic pathogen Pseudomonas aeruginosa uses two quorum-sensing m
National Academy of Sciences.
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35. Identification of Quorum-Quenching N-Acyl Homoserine Lactonases from Bacillus Species
A range of gram-negative bacterial species use N-acyl homoserine lactone (AHL) molecules as quorum-sensing signals to regulate different biological functions, including production of virulence factors. AHL is also known as an autoinducer. An autoinducer inactivation gene, aiiA, coding for an AHL lactonase, was cloned from a bacterial isolate, Bacillus sp. st
American Society for Microbiology.
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36. Inactivation of a bacterial virulence pheromone by phagocyte-derived oxidants: New role for the NADPH oxidase in host defense
Quorum sensing triggers virulence factor expression in medically important bacterial pathogens in response to a density-dependent increase in one or more autoinducing pheromones. Here, we show that phagocyte-derived oxidants target these autoinducers for inactivation as an innate defense mechanism of the host. In a skin infection model, expression of phagocy
National Academy of Sciences.