Base de dados : LILACS
Pesquisa : B03.440.400.425.377.500 [Categoria DeCS]
Referências encontradas : 4 [refinar]
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Id: lil-671883
Autor: Gómez Gómez, Liliana Cecilia; Valero Valero, Nelson; Morales Avendaño, Ever.
Título: Bacterias halotolerantes/alcalofilas productoras de ácido indol acetico (AIA) asociadas a Arthrospira platensis (Cyanophyceae) / Halotolerant alkalophilic and indolacetic acid producing bacteria associated with Arthrospira platensis (Cyanophyceae)
Fonte: Rev. colomb. biotecnol;14(2):81-88, dic. 2012. ilus, tab.
Idioma: es.
Resumo: Este trabajo tuvo como propósito contribuir al conocimiento de la interacción entre la cianobacteria alcalófila Arthrospira platensis y las bacterias que crecen asociadas a su mucilago. Se desarrolló un medio de cultivo heterotrófico en el cual se aislaron cinco cepas bacterianas asociadas a un monocultivo de A. platensis. Se determinó la capacidad de estas cinco cepas para producir ácido 3- indol acético (AIA). La tipificación molecular de los aislamientos bacterianos permitió identificarlos como Exiguobacterium aurantiacum str. DSM 20416, Xanthomonas sp. ML-122, Halomonas sp. Ap-5, Bacillus okhensis str. Kh10-101, Indibacter alkaliphilus, type str. LW1T; todas las cepas bacterianas obtenidas son halotolerantes, alcalófilas y productoras de AIA. Los resultados aportan evidencia para sugerir una interacción benéfica entre A. platensis y sus bacterias asociadas, quizá como estrategia evolutiva de cooperación para desarrollarse en un ambiente hipersalino.

The aim of this study was contribute to knowledge over alkalophilic cianobacteryum Arthrospira platensis and their interaction with some associated bacteria growing in their mucilage. Heterotrophic culture medium was designed, in this medium were isolated five bacterial strains associated to single culture of A. platensis. It was measured the 3-indol acetic acid (IAA) production by these bacterial strains. Molecular typing allowed identify these bacterial strains like Exiguobacterium aurantiacum str. DSM 20416, Xanthomonas sp. ML-122, Halomonas sp. Ap-5, Bacillus okhensis str. Kh10-101, Indibacter alkaliphilus, type str. LW1T; all these bacteria are halotolerant, alkalophilic and IAA producer. The findings allow suggest a beneficial interaction between A. platensis and their associated bacteria, maybe as evolutionary strategy of cooperation to grow and develop in hypersaline environments.
Descritores: Bacillus
Bactérias
Cianobactérias
Halomonas
-Xanthomonas
Responsável: CO326 - Departamento de Biología


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Texto completo SciELO Brasil
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Id: lil-656689
Autor: Qurashi, Aisha Waheed; Sabri, Anjum Nasim.
Título: Bacterial exopolysaccharide and biofilm formation stimulate chickpea growth and soil aggregation under salt stress
Fonte: Braz. j. microbiol;43(3):1183-1191, July-Sept. 2012. graf.
Idioma: en.
Resumo: To compensate for stress imposed by salinity, biofilm formation and exopolysaccharide production are significant strategies of salt tolerant bacteria to assist metabolism. We hypothesized that two previously isolated salt-tolerant strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) have an ability to improve plant growth, These strains can form biofilm and accumulate exopolysacharides at increasing salt stress. These results showed that bacteria might be involved in developing microbial communities under salt stress and helpful in colonizing of bacterial strains to plant roots and soil particles. Eventually, it can add to the plant growth and soil structure. We investigated the comparative effect of exopolysacharide and biofilm formation in two bacterial strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) in response to varying salt stress. We found that biofilm formation and exopolysaccharide accumulation increased at higher salinity. To check the effect of bacterial inoculation on the plant (Cicer arietinum Var. CM-98) growth and soil aggregation, pot experiment was conducted by growing seedlings under salt stress. Inoculation of both strains increased plant growth at elevated salt stress. Weight of soil aggregates attached with roots and present in soil were added at higher salt concentrations compared to untreated controls. Soil aggregation was higher at plant roots under salinity. These results suggest the feasibility of using above strains in improving plant growth and soil fertility under salinity.
Descritores: Biofilmes
Halomonas/metabolismo
Plâncton/metabolismo
Polissacarídeos Bacterianos/metabolismo
Solos Salitrosos/análise
Transtornos de Estresse por Calor/metabolismo
-Métodos
Plantas
Microbiologia do Solo
Tipo de Publ: Estudo Comparativo
Responsável: BR32.1 - Serviço de Biblioteca e Informação Biomédica


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Id: lil-634680
Autor: D´Ippólito, Sebastián; de Castro, Rosana E.; Herrera Seitz, Karina.
Título: Chemotactic responses to gas oil of Halomonas spp. strains isolated from saline environments in Argentina / Respuesta quimiotáctica hacia gas oil de cepas de Halomonas spp. aisladas de ambientes salinos de Argentina
Fonte: Rev. argent. microbiol;43(2):107-110, jun. 2011. ilus, graf.
Idioma: en.
Resumo: In this study, two halophilic bacterial strains isolated from saline habitats in Argentina grew in the presence of gas oil. They were identified as Halomonas spp. and Nesterenkonia sp. by 16S ribosomal RNA sequencing. Chemotaxis towards gas oil was observed in Halomonas spp. by using swimming assays.

En el presente trabajo se aislaron dos cepas bacterianas halofílicas a partir de muestras obtenidas en ambientes salinos de Argentina, que crecieron en presencia de gasoil como única fuente de carbono. Las cepas aisladas se identificaron como Halomonas spp. y Nesterenkonia sp. mediante secuenciación del gen del ARN ribosomal 16S. En ensayos de swimming, las cepas del genero Halomonas spp. mostraron una respuesta quimiotáctica hacia el gas oil.
Descritores: Quimiotaxia/efeitos dos fármacos
Halomonas/efeitos dos fármacos
Micrococcaceae/efeitos dos fármacos
Petróleo
-Argentina
Biodegradação Ambiental
Hidrocarbonetos
Halomonas/crescimento & desenvolvimento
Halomonas/isolamento & purificação
Micrococcaceae/crescimento & desenvolvimento
Micrococcaceae/isolamento & purificação
Ribotipagem
Tolerância ao Sal
Especificidade da Espécie
Água do Mar/microbiologia
Microbiologia da Água
Poluentes Químicos da Água
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: AR1.2 - Instituto de Investigaciónes Epidemiológicas


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Texto completo SciELO Chile
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Id: lil-522161
Autor: Silva-Aciares, Fernando; Riquelme, Carlos.
Título: Inhibition of attachment of some fouling diatoms and settlement of Ulva lactuca zoospores by film-forming bacterium and their extracellular products isolated from biofouled substrata in Northern Chile
Fonte: Electron. j. biotechnol;11(1):60-70, Jan. 2008. graf, tab.
Idioma: en.
Projeto: FONDEF.
Resumo: The biofouling of surfaces submerged in the marine environment includes primary colonization of the substrate by microorganisms including bacteria, microalgae, and microscopic reproductive propagules of macroorganisms such as algal zoospores. The present study reports the evaluation of the inhibitory potential of biofilms and extracellular products (EP) of the indigenous bacterium Alteromonas sp strain Ni1-LEM on the settlement of marine biofouling such as: (i) eight marine benthic diatoms and (ii) zoospores of the alga Ulva lactuca, as well as the germination of these zoospores and was compared with reference strains with proven antifouling properties, Halomonas marina (ATCC 25374) and Pseudoalteromonas tunicata. Highest antifouling activity was found for the indigenous strain. In attempts to better define the chemical nature of the antifouling substance in the EP of the Alteromonas sp strain Ni1-LEM, the culture filtrates were tested for activity after heat treatment, enzymatic treatments, dialysis through semipermeable membranes, and separation into polar (aqueous) and non-polar (organic) fractions. The results suggested that the antifouling substance in the culture filtrates to be protein or peptide in nature, thermostable, hydrophilic, and equal to or greater than 3500 daltons in molecular size. Antifouling substances from bacteria may lead to the development of novel antifouling agents in the future.
Descritores: Alteromonas
Biofilmes
Diatomáceas
Halomonas
Ulva
-Alga Marinha/microbiologia
Chile
Responsável: CL1.1 - Biblioteca Central



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