Chromobacterium Sp
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. In vitro and in vivo antitumor activity of crude extracts obtained from Brazilian Chromobacterium sp isolates
Natural products produced by microorganisms have been an important source of new substances and lead compounds for the pharmaceutical industry. Chromobacterium violaceum is a Gram-negative β-proteobacterium, abundant in water and soil in tropical and subtropical regions and it produces violacein, a pigment that has shown great pharmaceutical potential. Crud
Braz J Med Biol Res. Publicado em: 23/10/2012
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2. Chromobacterium sp. from the tropics: detection and diversity of phytase activity
Phytases are a group of enzymes that catalyze phytic acid hydrolysis with release of phosphorus (P). The ability of Chromobacterium sp. to produce phytase was detected in 115 out of 118 candidate bacteria isolated from different Brazilian biomas. This is the first report revealing the genus Chromobacterium as phytase producer.
Brazilian Journal of Microbiology. Publicado em: 2011-03
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3. Genetic diversity analysis by MLSA and antitumoral activity evaluation of Chromobacterium sp. strains. / Análise da diversidade genética por MLSA e avaliação da atividade antitumoral de linhagens de Chromobacterium sp.
A diversidade genética dos isolados de Chromobacterium sp. foi avaliada por Multilocus sequence analysis com base nas análises dos genes conservados rpoA, lepA, gyrB, fusA e rRNA 16S. A análise do gene rRNA 16S e MLSA agrupou os isolados no gênero Chromobacterium, entretanto, cinco dos isolados estão distantes filogeneticamente das linhagens tipo, C. vi
Publicado em: 2009
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4. Avaliação de bactérias fototróficas em lagoas de estabilização: diversidade, purificação e identificação / Evaluation of phototropic bacteria in stabilization lagoons: diversity, purification and identification
The phototrophic bacteria frequently blossom in the stabilization lagoons that are used in sanitary sewer treatment, forming a purple layer on its surface. Therefore, the study of the conditions that propitiate such blooms, the microbial diversity, the removal of the organic matter and the establishment of the relations between them permit to understand the
Publicado em: 2007
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5. Effect of Enzymes on the Composition and Structure of Chromobacterium violaceum Cell Envelopes1
Cell envelopes of Chromobacterium violaceum were isolated and treated under controlled conditions with trypsin, Pronase, lipase, phospholipase C, lysozyme, and a mixture of enzymes produced by a bacteriolytic Pseudomonas sp. After each enzyme treatment, losses in dry weight, protein, lipid, carbohydrate, 2,6-diaminopimelic acid, and total phosphorus were det
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6. Sulfur metabolism in the biosynthesis of monobactams.
We studied the biosynthesis of monobactams with respect to sulfur metabolism in Chromobacterium violaceum, Acetobacter sp., and Agrobacterium radiobacter. All three organisms used inorganic sulfur for monobactam production. When sulfur-containing amino acids were assayed as a source of sulfur for monobactam production, C. violaceum used cystine but not cyste
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7. Diversity Dynamics of Marine Bacteria Studied by Immunofluorescent Staining on Membrane Filters
Of 34 strains of marine bacteria isolated on a general seawater medium, 5 were selected for detailed studies of their population dynamics in the plankton. The isolates were characterized as Aeromonas sp., Chromobacterium cf. lividum, Vibrio sp., and two Pseudomonas spp. Specific antibodies were produced by immunization of rabbits, and bacterial cells were st
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8. Biosynthesis of monobactam compounds: origin of the carbon atoms in the beta-lactam ring.
The biosynthesis of monobactams by strains of Chromobacterium violaceum, Acetobacter sp., and Agrobacterium radiobacter was studied. Monobactams were produced during logarithmic growth by C. violaceum and Acetobacter sp. and during late log growth on glycerol and in stationary phase by A. radiobacter. The addition of various amino acids failed to significant
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9. Variability of the Influence of Physicochemical Factors Affecting Bacterial Adhesion to Polystyrene Substrata
The role of electrostatic and hydrophobic interactions and solid and liquid surface tensions in the adhesion of four bacterial species (Pseudomonas fluorescens, Enterobacter cloacae, Chromobacterium sp., and Flexibacter sp.) to hydrophobic polystyrene petri dishes and to more hydrophilic polystyrene tissue culture dishes was investigated. The effect of elect
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10. Molecular Cloning and Expression of Mn2+-Dependent Sphingomyelinase/Hemolysin of an Aquatic Bacterium, Pseudomonas sp. Strain TK4
We report here the molecular cloning and expression of a hemolytic sphingomyelinase from an aquatic bacterium, Pseudomonas sp. strain TK4. The sphingomyelinase gene was found to consist of 1,548 nucleotides encoding 516 amino acid residues. The recombinant 57.7-kDa enzyme hydrolyzed sphingomyelin but not phosphatidylcholine, phosphatidylserine, phosphatidylg
American Society for Microbiology.
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11. Laribacter hongkongensis gen. nov., sp. nov., a Novel Gram-Negative Bacterium Isolated from a Cirrhotic Patient with Bacteremia and Empyema
A bacterium was isolated from the blood and empyema of a cirrhotic patient. The cells were facultatively anaerobic, nonsporulating, gram-negative, seagull shaped or spiral rods. The bacterium grows on sheep blood agar as nonhemolytic, gray colonies 1 mm in diameter after 24 h of incubation at 37°C in ambient air. Growth also occurs on MacConkey agar and at
American Society for Microbiology.