Steinernema
Mostrando 37-47 de 47 artigos, teses e dissertações.
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37. Nematóides entomopatogênicos: potencial para exploração e uso na América do Sul
Nematóides entomopatogênicos apresentam potencial para o controle biológico de pragas e têm sido usados na América do Norte, Europa, Ásia e Austrália para o controle de pragas de solo e de ambientes crípticos. Esses nematóides podem ser facilmente produzidos em larga escala e ser aplicados com equipamentos convencionais. Ademais, têm ampla gama de
Neotropical Entomology. Publicado em: 2001-06
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38. Xenorhabdus nematophila Requires an Intact iscRSUA-hscBA-fdx Operon To Colonize Steinernema carpocapsae Nematodes
An insertion between iscA and hscB of the Xenorhabdus nematophila iscRSUA-hscBA-fdx locus, predicted to encode Fe-S assembly machinery, prevented colonization of Steinernema carpocapsae nematodes. The insertion disrupted cotranscription of iscA and hscB, but did not reduce hscBA expression, suggesting that X. nematophila requires coordinated expression of th
American Society for Microbiology.
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39. Development and application of oligonucleotide probes for molecular identification of Xenorhabdus species.
Synthetic deoxyoligonucleotide probes that hybridized against the region at positions 455 through 480 of 16S rRNA were developed for the identification of all five Xenorhabdus species. Sequence variation in the respective rRNA region between two strains of Xenorhabdus luminescens in addition allowed the construction of two strain-specific probes. Of 27 isola
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40. Early Colonization Events in the Mutualistic Association between Steinernema carpocapsae Nematodes and Xenorhabdus nematophila Bacteria
The bacterium Xenorhabdus nematophila is a mutualist of the entomopathogenic nematode Steinernema carpocapsae. During its life cycle, the bacterium exists both separately from the nematode and as an intestinal resident of a nonfeeding nematode form, the infective juvenile (IJ). The progression of X. nematophila from an ex vivo existence to a specific and per
American Society for Microbiology.
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41. Xenorhabdus nematophilus as a Model for Host-Bacterium Interactions: rpoS Is Necessary for Mutualism with Nematodes
Xenorhabdus nematophilus, a gram-negative bacterium, is a mutualist of Steinernema carpocapsae nematodes and a pathogen of larval-stage insects. We use this organism as a model of host-microbe interactions to identify the functions bacteria require for mutualism, pathogenesis, or both. In many gram-negative bacteria, the transcription factor ςS controls reg
American Society for Microbiology.
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42. Fast and accurate identification of Xenorhabdus and Photorhabdus species by restriction analysis of PCR-amplified 16S rRNA genes.
Thirteen bacterial strains of Xenorhabdus and 14 strains of Photorhabdus originating from a wide range of geographical and nematode host sources were typed by analyzing 16S rRNA gene (rDNA) restriction patterns obtained after digestion of PCR-amplified 16S rDNAs. Eight tetrameric restriction endonucleases were examined. A total of 17 genotypes were identifie
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43. 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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44. Purification and Characterization of an Extracellular Protease from Xenorhabdus nematophila Involved in Insect Immunosuppression
Xenorhabdus nematophila, a bacterium pathogenic for insects associated with the nematode Steinernema carpocapsae, releases high quantities of proteases, which may participate in the virulence against insects. Zymogram assays and cross-reactions of antibodies suggested that two distinct proteases were present. The major one, protease II, was purified and show
American Society for Microbiology.
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45. Mode and Tempo of Molecular Evolution in the Nematode Caenorhabditis: Cytochrome Oxidase II and Calmodulin Sequences
Through direct sequencing methods, the mitochondrial gene for cytochrome oxidase subunit two (CO II) and the single-copy nuclear gene for calmodulin were compared among strains of Caenorhabditis elegans and two other Caenorhabditis species (C. remanei and C. briggsae). In addition the CO II sequence was determined from a distantly related nematode, Steinerne
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46. Identification and Functional Characterization of a Xenorhabdus nematophila Oligopeptide Permease
The bacterium Xenorhabdus nematophila is a mutualist of Steinernema carpocapsae nematodes and a pathogen of insects. Presently, it is not known what nutrients the bacterium uses to thrive in these host environments. In other symbiotic bacteria, oligopeptide permeases have been shown to be important in host interactions, and we therefore sought to determine i
American Society for Microbiology.
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47. Stages of Infection during the Tripartite Interaction between Xenorhabdus nematophila, Its Nematode Vector, and Insect Hosts
Bacteria of the genus Xenorhabdus are mutually associated with entomopathogenic nematodes of the genus Steinernema and are pathogenic to a broad spectrum of insects. The nematodes act as vectors, transmitting the bacteria to insect larvae, which die within a few days of infection. We characterized the early stages of bacterial infection in the insects by con
American Society for Microbiology.