|
|
|
| Registros recuperados: 341 | |
|
|
| Sebastião,F. A; Nomura,D; Sakabe,R; Pilarski,F. |
| Columnaris disease is one of the main causes of mortality in tilapia rearing and is responsible for large economic losses worldwide. Hematology is a tool that makes it possible to study organisms' physiological responses to pathogens. It may assist in making diagnoses and prognoses on diseases in fish populations. The hematological variables of nile tilapia were studied in specimens with a clinical diagnosis of columnaris disease and in specimens that were disease-free. The total erythrocyte count, hemoglobin rate, hematocrit percentage, mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), mean corpuscular volume (MCV), organic defense blood cell percentages (leukocytes and thrombocytes) and hepatosomatic and splenosomatic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Bacteria; Hematology; Productive performance. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100036 |
| |
|
|
| Italiani,Valéria C. S.; Marques,Marilis V.. |
| The entry into stationary phase causes a change in the pattern of gene expression of bacteria, when the cells must express a whole set of genes involved mainly with resistance to starvation and to environmental stresses. As an attempt to identify genes important for the survival of Caulobacter crescentus in stationary phase, we have screened a library of 5,000 clones generated by random transposon mutagenesis for mutants that showed reduced viability after prolonged growth. Four clones were selected, which displayed either lower viability or a longer time of recovery from stationary phase. The genes disrupted were identified, and the gene products were found to be mainly involved with amino acid metabolism (glutamate N-acetyltransferase,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stationary phase; Stress; Transposon; Bacteria. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000100018 |
| |
|
|
| Abdelkarim,Mahdhi; Kamel,Chaieb; Fathi,Kammoun; Amina,Bakhrouf. |
| To evaluate the effect of two bacterial strains isolated from Artemia cysts and yeast (Candida utilis) on the survival, growth and total biomass production of its larvae, challenge tests were performed with Candida utilis, Pseudomonas stutzeri and Pasteurella haemolityca. In addition, a pathogenic strain of Vibrio alginolyticus was tested for comparative purposes. Pseudomonas stutzeri and Candida utilis have no impact on survival, but enhance growth and total biomass production of the larvae. However, we noted that Pasteurella haemolityca affect negatively Artemia larvae. The adhesion and antagonism assay demonstrates that Candida utilis and Pseudomonas stutzeri are fairly adherent and play an important role in the enhancement of the protection of Artemia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artemia; Probiotics; Adhesion; Yeast; Bacteria. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100017 |
| |
|
| |
|
|
| Meneghin,Silvana Perissatto; Reis,Fabricia Cristina; Almeida,Paulo Garcia de; Ceccato-Antonini,Sandra Regina. |
| The ethanol production in Brazil is carried out by fed-batch or continuous process with cell recycle, in such way that bacterial contaminants are also recycled and may be troublesome due to the substrate competition. Addition of sulphuric acid when inoculum cells are washed can control the bacterial growth or alternatively biocides are used. This work aimed to verify the effect of chlorine dioxide, a well-known biocide for bacterial decontamination of water and equipments, against contaminant bacteria (Bacillus subtilis, Lactobacillus plantarum, Lactobacillus fermentum and Leuconostoc mesenteroides) from alcoholic fermentation, through the method of minimum inhibitory concentration (MIC), as well as its effect on the industrial yeast inoculum. Lower MIC... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorine dioxide; Bacteria; Yeast; Antibacterial agent; Alcohol; Fermentation. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000200026 |
| |
|
|
| Macrae,Andrew. |
| New and exciting molecular methods, many using the 16S small sub-unit ribosomal nucleic acid molecule, are opening the microbial "black box" in soil. These studies have added much to our knowledge of microbial diversity in soils, and are beginning to advance our understanding of the relationship between this diversity and its function in soil processes. Over the next few years, the knowledge gained from molecular studies will, we hope, lead to improvements in sustainable land management and sustainable exploitation of soil genetic resources. As we enter the third millenium, it is appropriate to review the application of 16S rDNA methods to soil microbiology. This review examines 16S ribosomal DNA (rDNA) methods and their application to soil. It mentions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil; Bacteria; Ecology; 16S rDNA. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000200002 |
| |
|
|
| Victor,Ligia Valéria; Cortelli,Sheila Cavalca; Aquino,Davi Romeiro; Carvalho Filho,Jonas de; Cortelli,José Roberto. |
| This cross-sectional study evaluated the periodontal status and the presence of periodontopathogens in 132 young, black ethnic subjects who live in Salvador/Bahia-Brazil and have never smoked. Periodontal Probing Depth (PPD), Clinical Attachment Level (CAL), Plaque Index (PI) and Gingival Index (GI) were measured and analyzed by ANOVA and Wilcoxon tests (p<0.05) according to gender and age. The presence of A.actinomycetemcomitans, P.gingivalis, E.corrodens and F.nucleatum was determined by PCR and was analyzed by ANOVA, Wilcoxon, Student-t tests (p<0.05). Mean values of PPD and CAL were 2.18 and 1.0mm, respectively. Clinical parameters did not show differences between subjects of varying gender and age. The microbial prevalence was observed to be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: African-Americans; Bacteria; Epidemiologic studies; Teen health; Periodontics. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000200005 |
| |
|
|
| Bueno,Silvia Messias; Garcia-Cruz,Crispin Humberto. |
| Six polysaccharide-producing bacteria, isolated from soil samples and identified as Pseudomonas and Arthrobacter (Strains 3B, 4B, 7B, 21B, 18E and 21D), were tested for the yield of polysaccharides produced during growth in two culture media: one containing glucose and the other sucrose (1, 2, 3, 4 and 5%). The yield was quantified measuring the viscosity of the broth, using the Poiscuille equation. The effect of temperature and pH of the culture media was investigated. The largest polysaccharide yield was obtained when the concentration of the carbon source was lower than 2%. Glucose and sucrose stimulated the polysaccharide production in a similar way. When the initial pH of the fermentation broth was increased from 5.0 up to 7.0, there was an increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Soil; Polysaccharide production; Viscosity. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000300018 |
| |
|
| |
|
|
| El-Nakeeb,Moustafa A; Abou-Shleib,Hamida M; Khalil,Amal M; Omar,Hoda G; El-Halfawy,Omar M. |
| Several antihistaminics possess antibacterial activity against a broad spectrum of bacteria. However, the exact mechanism of such activity was unclear. Hence, the aim of this study is to investigate their mechanism of antibacterial activity especially their effect upon the permeability of the bacterial cytoplasmic membrane. The effects of azelastine, cetirizine, cyproheptadine and diphenhydramine were studied using Gram-positive and Gram-negative multiresistant clinical isolates. Leakage of 260 and 280 nm UV-absorbing materials was detected upon treatment with the tested antihistaminics; indicative of membrane alteration. Using an artificial membrane model, cholesterol-free negatively-charged unilamellar liposomes, confirmed the effect of antihistaminics... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antihistaminics; Azelastine; Bacteria; Cytoplasmic membrane; Liposomes; Permeability alteration. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300019 |
| |
|
|
| Reche,Maria Helena Lima Ribeiro; Fiuza,Lídia Mariana. |
| Bacteria are the most diverse living beings on earth and only a fraction of them have been identified. This paper aims at the analysis of the diversity of mesophilic and heterotrophic bacteria found in samples of irrigation water from rice-fields areas in Rio Grande do Sul State, Brazil. Sample collection was carried out in five rice crop regions areas and followed by isolation, multiplication and bacterial characterization. The species' identification was based on biochemical tests (API-System, bioMérieux). Bacterial diversity was determined by the Shannon & Weaner and Pielou index. The results regarding bacterial diversity revealed 26 species. The most abundant representatives belonged to the Bacillus, Corynebacterium, Staphylococcus and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Diversity; Water; Rice-field. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300009 |
| |
|
|
| Knaak,Neiva; Fiuza,Lidia Mariana. |
| The Anticarsia gemmatalis is responsible for the use of chemical insecticides in the soybean culture, causing a significant increase in the costs of farming and a great unbalance in the ecosystem. The use of microbial agents, like Bacillus thuringiensis serovar kurstaki (Btk) and Anticarsia gemmatalis nucleopolyhedrovirus (AgNPV), they are an alternative to chemical control of the pest insects. In the interaction analysis of the entomopathogenic bacteria and virus it is considered important the in vitro action mode of these microbiology control agents. Therefore, the present study aims the histopathological analysis of the A. gemmatalis larvae digestive system after the interaction in vivo of the entomopathogenic Btk and AgNPV, represented the Dipel and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Virus; Bacteria; Biological control; Lepidoptera. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000200017 |
| |
|
|
| Gaetti-Jardim Júnior,Elerson; Fardin,Angélica Cristiane; Gaetti-Jardim,Ellen Cristina; Castro,Alvimar Lima de; Schweitzer,Christiane Marie; Avila-Campos,Mario Julio. |
| Chronic osteomyelitis of maxilla and mandible is rare in industrialized countries and its occurrence in developing countries is associated with trauma and surgery, and its microbial etiology has not been studied thoroughly. The aim of this investigation was to evaluate the microbiota associated with osteomyelitis of mandible or maxilla from some Brazilian patients. After clinical and radiographic evaluation, samples of bone sequestra, purulent secretion, and biopsies of granulomatous tissues from twenty-two patients with chronic osteomyelitis of mandible and maxilla were cultivated and submitted for pathogen detection by using a PCR method. Each patient harbored a single lesion. Bacterial isolation was performed on fastidious anaerobe agar supplemented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osteomyelitis; Bacteria; Anaerobes; Maxilla; Mandible. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000400025 |
| |
|
|
| Simões,Marise; Pisani,Beatriz; Marques,Eneida Gonçalves Lemes; Prandi,Maria Angela Garnica; Martini,Maria Helena; Chiarini,Paulo Flávio Teixeira; Antunes,José Leopoldo Ferreira; Nogueira,Ana Paula. |
| We examined samples of irrigation water and vegetables from kitchen gardens in Campinas, Brazil. The bacterial analysis condemned 22.3% of the vegetable samples, and the parasitological examination condemned 14.5%. The criteria established by the Brazilian legislation condemned 11.8% of the irrigation water samples. Parasites were significantly more frequent in vegetables in the rainy season, while excessive fecal coliforms were more frequent in the dry season. A proper monitoring of the irrigation water supply is important to avoid the contamination of vegetables. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vegetables; Irrigation water; Bacteria; Parasites. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000400015 |
| |
|
|
| De La Torre-Ruiz,Neyser; Ruiz-Valdiviezo,Víctor Manuel; Rincón-Molina,Clara Ivette; Rodríguez-Mendiola,Martha; Arias-Castro,Carlos; Gutiérrez-Miceli,Federico Antonio; Palomeque-Dominguez,Héctor; Rincón-Rosales,Reiner. |
| ABSTRACT The effect of plant growth-promoting bacteria inoculation on plant growth and the sugar content in Agave americana was assessed. The bacterial strains ACO-34A, ACO-40, and ACO-140, isolated from the A. americana rhizosphere, were selected for this study to evaluate their phenotypic and genotypic characteristics. The three bacterial strains were evaluated via plant inoculation assays, and Azospirillum brasilense Cd served as a control strain. Phylogenetic analysis based on the 16S rRNA gene showed that strains ACO-34A, ACO-40 and ACO-140 were Rhizobium daejeonense, Acinetobacter calcoaceticus and Pseudomonas mosselii, respectively. All of the strains were able to synthesize indole-3-acetic acid (IAA), solubilize phosphate, and had nitrogenase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agave; Inoculation; Bacteria; Inulin; 16S rRNA. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300587 |
| |
|
| |
|
| |
|
|
| Braz,Vânia S.; Lang,Elza A.S.; Marques,Marilis V.. |
| The metallopeptidases have a very important role in bacteria, being involved in several processes that rely on protein turnover, such as nutrition, degradation of signal peptides, protein localization and virulence. We have cloned and characterized the gene of the metalloendopeptidase PepF from the aquatic bacterium Caulobacter crescentus. The gene upstream of pepF (orf1) encodes a conserved hypothetical protein found in Mycobacterium and Streptomyces. pepF is co-transcribed with the gene downstream (orf3), which encodes a protein that belongs to the ABC1 protein kinase family, suggesting that these two proteins may share a common function in the cell. The C. crescentus PepF protein possesses the conserved HEXGH motif present in zinc binding domains of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endopeptidase; M3 family; Gene regulation; Bacteria. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100017 |
| |
|
|
| Ramya,Shanivarsanthe Leelesh; Venkatesan,Thiruvengadam; Srinivasa Murthy,Kottilingam; Jalali,Sushil Kumar; Verghese,Abraham. |
| Abstract Diamondback moth (DBM), Plutella xylostella (Linnaeus), is a notorious pest of brassica crops worldwide and is resistant to all groups of insecticides. The insect system harbors diverse groups of microbiota, which in turn helps in enzymatic degradation of xenobiotic-like insecticides. The present study aimed to determine the diversity of gut microflora in DBM, quantify esterase activity and elucidate their possible role in degradation of indoxacarb. We screened 11 geographic populations of DBM in India and analyzed them for bacterial diversity. The culturable gut bacterial flora underwent molecular characterization with 16S rRNA. We obtained 25 bacterial isolates from larvae (n = 13) and adults (n = 12) of DBM. In larval gut isolates,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plutella xylostella; Bacteria; 16S rRNA; Phylogeny; Carboxylesterase; Indoxacarb. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200327 |
| |
|
| |
| Registros recuperados: 341 | |
|
|
|
