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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Susceptibilidade de micro-organismos patogênicos frente às micocinas de Wickerhamomyces anomalus ambientais / Susceptibility of pathogenic microorganisms against micocyns of environmental Wickerhamomyces anomalus

Paris, Ana Paula 07 December 2015 (has links)
Submitted by Neusa Fagundes (neusa.fagundes@unioeste.br) on 2018-03-06T17:51:44Z No. of bitstreams: 2 Ana_Paris2015.pdf: 1120007 bytes, checksum: fce1909bbad92341d65a1c30c6cd062f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-03-06T17:51:44Z (GMT). No. of bitstreams: 2 Ana_Paris2015.pdf: 1120007 bytes, checksum: fce1909bbad92341d65a1c30c6cd062f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2015-12-07 / Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Estado do Paraná (FA) / The significant increase in the incidence and prevalence of pathogenic microorganism resistance to antimicrobials has become a major public health problem, making it important to search for new therapeutic compounds against this threat. Micocyns produced by some yeasts, like Wickerhamomyces anomalus, have activity against other microorganisms, action which possibly occurs after the binding of micocyn to specific receptors on cell wall and plasma membrane of sensitive microorganisms and thus, presenting a promising antimicrobial activity. The aim of this study was to evaluate the antimicrobial action of micocyns present in the culture supernatant and in the strain cell walls of W. anomalus (WA40, WA45 and WA92) opposite the yeast and bacteria. The three strains of W. anomalus were isolated from the soil. The micocyns of W. anomalus WA40, WA45 and WA92 were tested against the bacteria Escherichia coli, Acinetobacter baumanii and Staphylococcus aureus and the yeast Candida albicans, Candida glabrata, Candida guilliermondii, Candida tropicalis and Cryptococcus neoformans. The mycocins of the three strains of W. anomalus showed inhibitory effect on the tested microorganisms and micocinas showed a little toxicity in haemolysis test on human erythrocytes. The micocyns of W. anomalus WA40, WA45 and WA92 presented a broad spectrum of action which may be promising in the development of antimicrobial drugs. / O expressivo aumento da incidência e prevalência de resistência de micro-organismos patogênicos aos antimicrobianos tem se tornado um grande problema de saúde pública, tornando-se importante a pesquisa de novos compostos terapêuticos contra essa ameaça. Micocinas produzidas por algumas leveduras, como Wickerhamomyces anomalus, possuem atividade contra outros micro-organismos, ação que possivelmente ocorre após a ligação da micocina a receptores específicos na parede celular e na membrana plasmática dos micro-organismos sensíveis e assim, apresentando uma promissora atividade antimicrobiana. O objetivo deste trabalho é avaliar a ação antimicrobiana de micocinas presentes no sobrenadante de cultura e na parede celular de cepas de W. anomalus (WA40, WA45 e WA92) frente às leveduras e bactérias patogênicas. As três cepas de W. anomalus foram isoladas do solo. As micocinas de W. anomalus WA40, WA45 e WA92 foram testadas frente às bactérias Escherichia coli, Acinetobacter baumanii e Sthaphylococcus aureus e às leveduras Candida albicans, Candida glabrata, Candida guilliermondii, Candida tropicalis e Cryptococcus neoformans. As micocinas do sobrenadante de cultura e da parede celular das três cepas de W. anomalus apresentaram efeito inibitório nos micro-organismos testados e mostraram pouca toxicidade em teste de hemólise em eritrócitos humanos. As micocinas de W. anomalus WA40, WA45 e WA92 apresentaram um amplo espectro de ação podendo ser promissores no desenvolvimento de medicamentos antimicrobianos.

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