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Mostrando 1-12 de 204 artigos, teses e dissertações.
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1. Low-intensity red and infrared laser effects at high fluences on Escherichia coli cultures
Semiconductor laser devices are readily available and practical radiation sources providing wavelength tenability and high monochromaticity. Low-intensity red and near-infrared lasers are considered safe for use in clinical applications. However, adverse effects can occur via free radical generation, and the biological effects of these lasers from unusually
Braz J Med Biol Res. Publicado em: 28/07/2015
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2. Nucleotide excision repair pathway assessment in DNA exposed to low-intensity red and infrared lasers
Low-intensity lasers are used for prevention and management of oral mucositis induced by anticancer therapy, but the effectiveness of treatment depends on the genetic characteristics of affected cells. This study evaluated the survival and induction of filamentation of Escherichia coli cells deficient in the nucleotide excision repair pathway, and the action
Braz J Med Biol Res. Publicado em: 10/07/2015
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3. Low-level red laser therapy alters effects of ultraviolet C radiation on Escherichia coli cells
Low-level lasers are used at low power densities and doses according to clinical protocols supplied with laser devices or based on professional practice. Although use of these lasers is increasing in many countries, the molecular mechanisms involved in effects of low-level lasers, mainly on DNA, are controversial. In this study, we evaluated the effects of l
Braz J Med Biol Res. Publicado em: 10/07/2015
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4. Treatment with some anti-inflammatory drugs reduces germ tube formation in Candida albicans strains
Candida albicans is an opportunistic dimorphic fungus that inhabits various host mucosal sites. It can cause both superficial and serious systemic disease. Conversion from the yeast to the hyphal form has been associated with increased virulence and mucosal invasiveness. The aim of this study was to investigate the effect of sodium diclofenac and aspirin on
Braz. J. Microbiol.. Publicado em: 2014-12
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5. Effect of alcohols on filamentation, growth, viability and biofilm development in Candida albicans
In this study we report the potential of alcohols as morphogenetic regulators in Candida albicans. All the alcohols tested influenced various modes of growth like planktonic as well as biofilm forms. Viability was affected at high concentrations. Among the alcohols, the response of C. albicans to amyl alcohol (pentanol) was noteworthy. Amyl alcohol at a conc
Braz. J. Microbiol.. Publicado em: 25/02/2014
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6. Candida albicans morphologies revealed by scanning electron microscopy analysis
Scanning electron microscope (SEM) observations were used to analyze particular morphologies of Candida albicans clinical isolate (strain 82) and mutants defective in hyphae-promoting genes EFG1 (strain HLC52) and/ or CPH1 (strains HLC54 and Can16). Transcription factors Efg1 and Cph1 play role in regulating filamentation and adhesion of C. albicans' morphol
Braz. J. Microbiol.. Publicado em: 10/12/2013
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7. Evolution of invasive pulmonary aspergillosis produced in mice treated with monoclonal antibodies anti GR-1/Ly-6G and infected with Aspergillus fumigatus strains which presented distincts patterns of production of elastase. / Evolução da aspergilose pulmonar invasiva produzida em camundongos tratados com anticorpos monoclonais anti GR-1/Ly-6G e infectados com amostras de Aspergillus fumigatus que apresentaram distintos padrões de produção de elastase
Invasive Pulmonary Aspergillosis (IPA) is an opportunistic fungal disease, caused mainly by Aspergillus fumigatus, that affects immunocompromised patients. To better understand this mycoses, we originally established in C57BL/6 mice an experimental model of neutrophils depletion by intraperitoneal inoculation of antibodies anti GR-1/Ly-6G, confirmed by total
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/04/2012
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8. Relação dos sistemas de reparo de DNA em Escherichia coli K-12 com resistência a antibióticos, características adesivas e formação de biofilme / Relation of DNA repair systems in Escherichia coli K-12 with antibiotic resistance, adhesive characteristics and biofilm formation
As espécies reativas de oxigênio (ERO) são geradas durante o metabolismo celular normal e podem produzir vários danos oxidativos no DNA, tais como lesões nas bases nitrogenadas ou sítios apurínico/apirimidínico (AP). Essas lesões podem acarretar acúmulo de sítios de mutações, caso esses danos não sejam reparados. Entretanto, as bactérias possu
Publicado em: 2008
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9. Caracterização molecular e funcional dos genes ras1 e ras2 do fungo dimórfico e patogênico Paracoccidioides Brasiliensis
Paracoccidioides brasiliensis is a thermo-dimorphic fungus that causes a human systemic mycosis with high incidence in Latin America. Due to their participation in the control of pathogen morphogenesis, differentiation and virulence the characterization of ras genes in P. brasiliensis was done. It was identified ras1 and ras2 coding for two different protein
Publicado em: 2007
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10. Características da formação do biofilme de Candida tropicalis eresistência a antifúngicos
Candida tropicalis is a common non-albicans species related to nosocomial candidemia and candiduria. Most of Candida spp. infections are associated with biofilm formation on the implanted medical devices or host ephitelial cells surfaces. Sessile cells display phenotypic traits dramatically different from their free-living planktonic counterparts, such as in
Publicado em: 2006
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11. Caracterização de linhagens industriais de Saccharomyces cerevisiae quanto a filamentação induzida por álcoois e deficiência de nutrientes / Characterization of industrial strains of Saccharomyces cerevisiae by filamentous growth induced by alcohol and nutrient deprivation
O uso de microrganismos na biotecnologia tem grande importância e interesse econômico no Brasil. Entre esses microrganismos a levedura Saccharomyces cerevisiae tem grande destaque nos processos fermentativos para produção de pães, bebidas e álcool combustível. Dimorfismo em S. cerevisiae (alteração na morfologia celular de células brotantes para es
Publicado em: 2006
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12. Enhanced Production of Recombinant Proteins in Escherichia coli by Filamentation Suppression
During growth of high-cell-density cultures of Escherichia coli, overproduction of recombinant proteins often results in increased stress response, cell filamentation, and growth cessation. Filamentation of cells consequently lowers final achievable cell concentration and productivity of the target protein. Reported here is a methodology that should prove us
American Society for Microbiology.