Base de dados : LILACS
Pesquisa : B03.440.400.425.575 [Categoria DeCS]
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Texto completo SciELO Brasil
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Id: lil-741271
Autor: Thomas, Roshmi; Janardhanan, Anju; Varghese, Rintu T.; Soniya, E.V.; Mathew, Jyothis; Radhakrishnan, E.K..
Título: Antibacterial properties of silver nanoparticles synthesized by marine Ochrobactrum sp.
Fonte: Braz. j. microbiol;45(4):1221-1227, Oct.-Dec. 2014. ilus, graf, tab.
Idioma: en.
Resumo: Metal nanoparticle synthesis is an interesting area in nanotechnology due to their remarkable optical, magnetic, electrical, catalytic and biomedical properties, but there needs to develop clean, non-toxic and environmental friendly methods for the synthesis and assembly of nanoparticles. Biological agents in the form of microbes have emerged up as efficient candidates for nanoparticle synthesis due to their extreme versatility to synthesize diverse nanoparticles with varying size and shape. In the present study, an eco favorable method for the biosynthesis of silver nanoparticles using marine bacterial isolate has been attempted. Very interestingly, molecular identification proved it as a strain of Ochrobactrum anhtropi. In addition, the isolate was found to have the potential to form silver nanoparticles intracellularly at room temperature within 24 h. The biosynthesized silver nanoparticles were characterized by UV-Vis spectroscopy, transmission electron microscope (TEM) and scanning electron microscope (SEM). The UV-visible spectrum of the aqueous medium containing silver nanoparticles showed a peak at 450 nm corresponding to the plasmon absorbance of silver nanoparticles. The SEM and TEM micrographs revealed that the synthesized silver nanoparticles were spherical in shape with a size range from 38 nm - 85 nm. The silver nanoparticles synthesized by the isolate were also used to explore its antibacterial potential against pathogens like Salmonella Typhi, Salmonella Paratyphi, Vibrio cholerae and Staphylococcus aureus.
Descritores: Antibacterianos/farmacologia
Organismos Aquáticos/classificação
Organismos Aquáticos/genética
Organismos Aquáticos/isolamento & purificação
Organismos Aquáticos/metabolismo
Análise por Conglomerados
DNA Bacteriano/química
DNA Bacteriano/genética
DNA Ribossômico/química
DNA Ribossômico/genética
Bactérias Gram-Negativas/efeitos dos fármacos
Microscopia Eletrônica
Ochrobactrum/isolamento & purificação
Análise de Sequência de DNA
Análise Espectral
Staphylococcus aureus/efeitos dos fármacos
Fatores de Tempo
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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Texto completo SciELO Brasil
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Id: lil-723121
Autor: Batool, Rida; Yrjälä, Kim; Hasnain, Shahida.
Título: Impact of environmental stress on biochemical parameters of bacteria reducing chromium
Fonte: Braz. j. microbiol;45(2):573-583, Apr.-June 2014. ilus, graf, tab.
Idioma: en.
Projeto: Higher Education Commission of Pakistan.
Resumo: Chromium pollution is produced in connection with industrial processes like in tanneries. It has been suggested that bioremediation could be a good option for clean up. The stress effect of variable chromate levels, pHs and growth temperatures on biochemical parameters of two Cr(VI) reducing bacterial strains Pseudomonas aeruginosa Rb-1 and Ochrobactrum intermedium Rb-2 was investigated. Transmission electrone microscopy (TEM) was performed to study the intracellular distribution of Cr(VI). It was observed that initial stress of 1000 µgmL-1 caused significant enhancement of all studied biochemical parameters at pH 7.0 and growth temperature of 37 °C showing great bioremediation potential of the strains. Transmission electron microscopy revealed that the distribution of chromium precipitates was not uniform as they were distributed in the cytoplasm as well as found associated with the periplasm and outer membrane. Fourier transform infrared spectroscopy showed the possible involvement of carboxyl, amino, sulpohonate and hydroxyl groups present on the bacterial cell surface for the binding of Cr(VI) ions. Cr(VI) stress brought about changes in the distridution of these functional groups. It can be concluded that the investigated bacterial strains adjust well to Cr(VI) stress in terms of biochemical parameters and along that exhibited alteration in morphology.
Descritores: Cromo/metabolismo
Pseudomonas aeruginosa/metabolismo
Estresse Fisiológico
Poluentes Ambientais/metabolismo
Poluentes Ambientais/toxicidade
Concentração de Íons de Hidrogênio
Microscopia Eletrônica de Transmissão
Ochrobactrum/efeitos dos fármacos
Ochrobactrum/efeitos da radiação
Pseudomonas aeruginosa/efeitos dos fármacos
Pseudomonas aeruginosa/efeitos da radiação
Pseudomonas aeruginosa/ultraestrutura
Espectroscopia de Infravermelho com Transformada de Fourier
Propriedades de Superfície
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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