Résumé
Sujets)
Humains , Organismes aquatiques/isolement et purification , Techniques de typage bactérien/méthodes , Acides gras/biosynthèse , Pseudomonas aeruginosa/génétique , Pseudomonas aeruginosa/isolement et purification , Organismes aquatiques/génétique , Génotype , Géographie , Variation génétique/génétique , Inde , Infections à Pseudomonas/microbiologieRésumé
Awareness on antioxidants and its significance in human healthcare has increased many folds in recent time. Increased demand requisite on welcoming newer and alternative resources for natural antioxidants. Seaweed associated pigmented bacteria screened for its antioxidant potentials reveals 55.5% of the organisms were able to synthesize antioxidant compounds. DPPH assay showed 20% of the organisms to reach a antioxidant zone of 1 cm and 8.3% of the strains more than 3 cm. Pseudomonas koreensis (JX915782) a Sargassum associated yellowish brown pigmented bacteria have better activity than known commercial antioxidant butylated hydroxytoluene (BHT) against DPPH scavenging. Serratia rubidaea (JX915783), an associate of Ulva sp. and Pseudomonas argentinensis (JX915781) an epiphyte of Chaetomorpha media, were also contributed significantly towards ABTS (7.2% ± 0.03 to 15.2 ± 0.09%; 1.8% ± 0.01 to 15.7 ± 0.22%) and FRAP (1.81 ± 0.01 to 9.35 ± 0.98; 7.97 ± 0.12 to 18.70 ± 1.84 μg/mL of AsA Eq.) respectively. 16S rRNA gene sequence analysis revealed bacteria that have higher antioxidant activity belongs to a bacterial class Gammaproteobacteria. Statistical analysis of phenolic contents in relation with other parameters like DPPH, ABTS, reducing power and FRAP are well correlated (p < 0.05). Results obtained from the current study inferred that the seaweed associated pigmented bacteria have enormous potential on antioxidant compounds and need to be extracted in a larger way for clinical applications.
Sujets)
Antioxydants/métabolisme , Organismes aquatiques/classification , Organismes aquatiques/métabolisme , Gammaproteobacteria/classification , Gammaproteobacteria/métabolisme , Algue marine/microbiologie , Organismes aquatiques/génétique , Organismes aquatiques/isolement et purification , ADN bactérien/composition chimique , ADN bactérien/génétique , ADN ribosomique/composition chimique , ADN ribosomique/génétique , Gammaproteobacteria/génétique , Gammaproteobacteria/isolement et purification , Données de séquences moléculaires , Pigments biologiques/métabolisme , /génétique , Analyse de séquence d'ADNRésumé
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.
Sujets)
Antibactériens/pharmacologie , Nanoparticules/métabolisme , Ochrobactrum/métabolisme , Argent/pharmacologie , Antibactériens/métabolisme , Organismes aquatiques/classification , Organismes aquatiques/génétique , Organismes aquatiques/isolement et purification , Organismes aquatiques/métabolisme , Analyse de regroupements , ADN bactérien/composition chimique , ADN bactérien/génétique , ADN ribosomique/composition chimique , ADN ribosomique/génétique , Bactéries à Gram négatif/effets des médicaments et des substances chimiques , Microscopie électronique , Nanoparticules/composition chimique , Nanoparticules/ultrastructure , Ochrobactrum/classification , Ochrobactrum/génétique , Ochrobactrum/isolement et purification , Phylogenèse , /génétique , Analyse de séquence d'ADN , Analyse spectrale , Argent/métabolisme , Staphylococcus aureus/effets des médicaments et des substances chimiques , Température , Facteurs tempsRésumé
Recent advances in genomic and post-genomic technologies have now established the new standard in medical and biotechnological research. The introduction of next-generation sequencing, NGS,has resulted in the generation of thousands of genomes from all domains of life, including the genomes of complex uncultured microbial communities revealed through metagenomics. Although the application of genomics to marine biodiversity remains poorly developed overall, some noteworthy progress has been made in recent years. The genomes of various model marine organisms have been published and a few more are underway. In addition, the recent large-scale analysis of marine microbes, along with transcriptomic and proteomic approaches to the study of teleost fishes, mollusks and crustaceans, to mention a few, has provided a better understanding of phenotypic variability and functional genomics. The past few years have also seen advances in applications relevant to marine aquaculture and fisheries. In this review we introduce several examples of recent discoveries and progress made towards engendering genomic resources aimed at enhancing our understanding of marine biodiversity and promoting the development of aquaculture. Finally, we discuss the need for auspicious science policies to address challenges confronting smaller nations in the appropriate oversight of this growing domain as they strive to guarantee food security and conservation of their natural resources.