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1.
Mem. Inst. Oswaldo Cruz ; 113(6): e170558, 2018.
Article in English | LILACS | ID: biblio-1040595

ABSTRACT

This study reports the presence of the blaNDM-1 gene in an isolate of Stenotrophomonas maltophilia obtained from a Brazilian soil, inside an IncA/C plasmid with ~ 45 Kb. To the best of our knowledge, this is the second report in the world and the first in Brazil of NDM-producing bacterium isolated from soil.


Subject(s)
Soil Microbiology , beta-Lactamases/genetics , Stenotrophomonas maltophilia/enzymology , Stenotrophomonas maltophilia/isolation & purification , Stenotrophomonas maltophilia/drug effects , Disk Diffusion Antimicrobial Tests , Anti-Bacterial Agents/pharmacology
2.
Electron. j. biotechnol ; 12(4): 6-7, Oct. 2009. ilus, tab
Article in English | LILACS | ID: lil-558549

ABSTRACT

The use of microorganisms in the degradation and detoxification of many toxic xenobiotics, especially pesticides, is an efficient tool for the decontamination of polluted sites in the environment. A novel bacterial strain (M1) was isolated from several water samples contaminated with methomyl which is capable of degrading methomyl pesticide (1000 ppm) in the presence of 0.05 percent glucose. These water samples were collected from different irrigation sites in Egypt where methomyl is heavily applied. The partial sequence of 16SrRNA gene of the isolate showed the highest similarity to Stenotrophomonas maltophilia. Restriction fragment patterns of isolated plasmid DNA showed that this strain harbours two different plasmids PMa (8Kb) and PMb (5Kb). PMb succeeded to be transferred to Escherichia coli DH5á strain. This transformed strain (M2) acquired the ability to grow in the presence of methomyl (1000 ppm) and 0.05 percent glucose. So it was deduced that the gene responsible for the degradation process was encoded by this plasmid. The ability of the two strains M1 and M2 to degrade methomyl was detected by using solid phased extraction coupled to capillary liquid chromatography-electrospray ionization-mass spectrometry (SPE-LC-ESI-MS).


Subject(s)
Animals , Methomyl/antagonists & inhibitors , Plasmids , Plasmids/genetics , Stenotrophomonas maltophilia/enzymology , Stenotrophomonas maltophilia/metabolism , Chemical Waste Degradation , Spectrometry, Mass, Electrospray Ionization/methods
3.
Rev. Inst. Med. Trop. Säo Paulo ; 47(5): 275-280, Sept.-Oct. 2005.
Article in English | LILACS, SES-SP | ID: lil-417086

ABSTRACT

Tripsina é necessária na ativação da clivagem do vírus influenza A in vitro. Esta clivagem é importante para entrada do vírus na célula por endocitose mediada pelo receptor celular. Bactérias presentes no trato respiratório são fontes de proteases que podem contribuir na replicação do vírus influenza in vivo. Entre 47 amostras coletadas de cavalos, suínos e humanos, a influenza foi isolada e confirmada em 13 que estavam co-infectadas com bactéria flagelada: Stenotrophomonas maltophilia desde o início destes experimentos. Apesar do tratamento das amostras com antibióticos, as bactérias resistiram em diversas delas (48.39%). A protease (elastase), secretada pela Stenotrophomonas maltophilia, desenvolveu papel decisivo na potencialização da infecção pelo vírus influenza. Essa atividade proteolítica foi detectada pelo teste de ágar-caseína. Amostras positivas para o vírus influenza isolado em animais, bem como em humanos tiveram potencialização da infectividade (ECP) em células MDCK e NCI-H292, sempre que a Stenotrophomonas maltophilia esteve presente. Os referidos microorganismos, bactéria e vírus foram observados ultra-estruturalmente. Esses achados in vitro demonstram como complicações respiratórias podem ocorrer in vivo, através da contribuição de protease microbiana, provocando aumento da inflamação ou destruição dos inibidores celulares de proteases endógenas, nos hospedeiros susceptíveis à influenza.


Subject(s)
Animals , Cattle , Humans , Gram-Negative Bacterial Infections/microbiology , Orthomyxoviridae Infections/microbiology , Orthomyxoviridae/isolation & purification , Stenotrophomonas maltophilia/isolation & purification , Enzyme Activation , Gram-Negative Bacterial Infections/complications , Horses , Influenza, Human/complications , Influenza, Human/microbiology , Microscopy, Electron , Orthomyxoviridae Infections/complications , Orthomyxoviridae/pathogenicity , Orthomyxoviridae/ultrastructure , Pancreatic Elastase/biosynthesis , Stenotrophomonas maltophilia/enzymology , Swine , Virus Activation
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