Entomopathogenic Bacteria
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Prospecção e caracterização de isolados de Bacillus thuringiensis no controle de Spodoptera frugiperda / Collect and characterization of Bacillus thuringiensis isolated in control OF Spodoptera frugiperda
Bacillus thuringiensis (Bt) é uma bactéria de ocorrência ubíqua encontrada em substratos como solo, água, superfície de plantas, insetos mortos, etc, caracterizada pela produção de proteínas tóxicas a insetos (Cry, Cyt e Vip). Bt é considerada a principal bactéria entomopatológica com ampla utilização no controle biológico de pragas, como ins
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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2. Seleção e caracterização de estirpes de Bacillus thuringiensis efetivas no controle da traça-das-crucíferas Plutella xylostella.
O objetivo deste trabalho foi selecionar e caracterizar, no Banco de Germoplasma de Bacillus spp., da Empresa Brasileira de Pesquisa Agropecuária, as estirpes de Bacillus thuringiensis mais tóxicas à Plutella xylostella, por métodos morfológicos, bioquímicos e moleculares. Das 203 estirpes testadas, sete causaram 100% de mortalidade e foram semelhantes
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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3. Caracterização molecular de isolados de nematóides entomopatogênicos, Heterorhabditis spp. e seus simbiontes, Photorhabdus spp., provenientes de Monte Negro, RO. / Molecular characterization of entomopathogenic nematodes isolates, Heterorhabditis spp. and its bacterial symbionts, Photorhabdus spp., from Monte Negro, RO, Brazil.
Os isolados de nematóides entomopatogênicos provenientes do solo de Monte Negro (RO) receberam o prefixo LPP seguido de um número sequencial. As linhagens de bactérias simbiontes receberam o prefixo MN como referência ao local de isolamento. As culturas dos isolados de nematóides entomopatogênicos LPP foram estabelecidas em nosso laboratório, sendo n
Publicado em: 2010
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4. Techniques for evaluation in vitro of the effect od phytosanitay products on Bacillus thuringiensis var. kurstaki / TÃcnicas para avaliaÃÃo in vitro do efeito de produtos fitossanitÃrios em Bacillus thuringiensis var. kurstaki
The objective of this research was evaluation "in vitro" the effect of fungicides and herbicides on Bacillus thuringiensis var. kurstaki (Btk). The five fungicides: epoxiconazole, fentin hydroxide, azoxystrobin, tebuconazole and carbendazim, and five herbicides: sulfentrazone, lactofen, imazethapyr, fenoxaprop and metribuzin were tested at two concentrations
Publicado em: 2006
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5. Estudos de Bacillus thuringiensis Berliner visando ao controle de Spodoptera frugiperda (J.E.Smith). / Bacillus thuringiensis berliner research applied for the control of Spodoptera frugiperda (J. E. Smith).
From 24 soil samples about 461 bacterial colonies have been isolated, and 190 were identified as Bacillus thuringiensis (Bt). The relation between soil chemical characteristics and the presence of this pathogen may be expressed by the equation iBt = -0,4 + 0,6Ca + 0,07Cu + 0,009Fe - 0,53Mg -0,12Mn + 1,26Zn. Among 83 Bt isolates assayed against Spodoptera fru
Publicado em: 2004
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6. Modelagem da evolução da resistência de pragas a toxinas Bt expressas em culturas transgênicas: quantificação de risco utilizando análise de incertezas. / Modeling pest resistance evolution to bt toxins expressed by transgenic crops: risk assessment using uncertainty analisys.
One of the main risks associated to transgenic crops expressing Bacillus thuringiensis (Bt) toxins is the pest resistance evolution, process driven by genetic and ecological inter related factors. A key parameter that influences the rate of resistance evolution is the initial frequency of the resistance allele in the pest population (FreqInicial). Due to com
Publicado em: 2003
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7. Identification of entomopathogenic Bacillus isolated from Simulium (Diptera, Simuliidae) larvae and adults
Entomopathogenic bacteria isolated from Simulium larvae and adults from breeding sites in the states of São Paulo and Rio de Janeiro, Brazil, were identified as 18 strains of Bacillus thuringiensis and one of B. sphaericus. Most of these strains were serotyped according to their flagellar antigens. However, nine of the B. thuringiensis samples, could not be
Memórias do Instituto Oswaldo Cruz. Publicado em: 2001-10
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8. Response of Ants to a Deterrent Factor(s) Produced by the Symbiotic Bacteria of Entomopathogenic Nematodes
The production of an ant-deterrent factor(s) (ADF) by Xenorhabdus nematophila and Photorhabdus luminescens, the symbiotic bacteria of the nematodes Steinernema carpocapsae and Heterorhabditis bacteriophora, respectively, was examined. In addition to an in vivo assay in which bacteria were tested for their ability to produce ADF within insect cadavers (M.E. B
American Society for Microbiology.
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9. Purification and Characterization of a High-Molecular-Weight Insecticidal Protein Complex Produced by the Entomopathogenic Bacterium Photorhabdus luminescens
Photorhabdus luminescens is a gram-negative enteric bacterium that is found in association with entomopathogenic nematodes of the family Heterorhabditidae. The nematodes infect a variety of soil-dwelling insects. Upon entering an insect host, the nematode releases P. luminescens cells from its intestinal tract, and the bacteria quickly establish a lethal sep
American Society for Microbiology.
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10. PCR-Ribotyping of Xenorhabdus and Photorhabdus Isolates from the Caribbean Region in Relation to the Taxonomy and Geographic Distribution of Their Nematode Hosts
The genetic diversity of symbiotic Xenorhabdus and Photorhabdus bacteria associated with entomopathogenic nematodes was examined by a restriction fragment length polymorphism analysis of PCR-amplified 16S rRNA genes (rDNAs). A total of 117 strains were studied, most of which were isolated from the Caribbean basin after an exhaustive soil sampling. The collec
American Society for Microbiology.
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11. Variation in the Effectors of the Type III Secretion System among Photorhabdus Species as Revealed by Genomic Analysis
Entomopathogenic bacteria of the genus Photorhabdus harbor a type III secretion system. This system was probably acquired prior to the separation of the species within this genus. Furthermore, the core components of the secretion machinery are highly conserved but the predicted effectors differ between Photorhabdus luminescens and P. asymbiotica, two highly
American Society for Microbiology.
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12. The PhlA Hemolysin from the Entomopathogenic Bacterium Photorhabdus luminescens Belongs to the Two-Partner Secretion Family of Hemolysins
Photorhabdus is an entomopathogenic bacterium symbiotically associated with nematodes of the family Heterorhabditidae. Bacterial hemolysins found in numerous pathogenic bacteria are often virulence factors. We describe here the nucleotide sequence and the molecular characterization of the Photorhabdus luminescens phlBA operon, a locus encoding a hemolysin wh
American Society for Microbiology.