21.
Atividade antimicrobiana de bactérias lácticas de embutidos curados frente a Listeria monocytogenes
- Prado,C.S.; Santos,W.L.M.; Carvalho,C.R.; Moreira,E.C.; Costa,O.
Cepas de bactérias lácticas recuperadas de 336 colônias isoladas e selecionadas foram submetidas ao teste de atividade antimicrobiana direta, que identificou as produtoras de substâncias antimicrobianas capazes de inibir in vitro o desenvolvimento de duas cepas indicadoras de Listeria monocytogenes. As 108 cepas que inibiram diretamente pelo menos uma das cepas indicadoras receberam a denominação DTEI e foram selecionadas para o teste de atividade antimicrobiana indireta contra as mesmas cepas de L. monocytogenes, assim como frente a outras cepas de bactérias lácticas de origens diversas. Essa atividade inibidora indireta foi avaliada por meio de sobrenadantes isentos de células, esterilizados por...
22.
The generic names of bacteria,
- Enlows, Ella Morgan (Austin), Mrs., 1884-
115 p.
23.
The chemical activities of bacteria.
- Gale, Ernest Frederick. 1914-
[3d ed.]
24.
Detecção de bactérias periodontopatogênicas na saliva de crianças em fase de dentadura mista
- Vivien Thiemy Sakai
Avaliar a prevalência de 4 bactérias periodontopatogênicas potenciais (Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella nigrescens e Treponema denticola), por meio da técnica da reação em cadeia da polimerase (PCR), na saliva de crianças com dentadura mista e correlacionar estes achados com um parâmetro clínico de saúde gengival, o índice gengival (IG). Além disso, a fim de se verificar a estabilidade de colonização destas bactérias, todas as crianças foram reavaliadas após um ano. Sessenta e duas (96,9%) e 50 (83,3%) crianças apresentaram baixa inflamação gengival, enquanto que 2 (3,1%) e 10 (16,7%) tiveram escores moderados nas avaliação realizadas em 2003 e 2004,...
25.
Metabolic and biochemical responses of probiotic bacteria to oxygen
- Talwalkar, Akshat; Kailasapathy, Kasipathy
The interaction between oxygen and probiotic bacteria was studied by growing Lactobacillus acidophilus and Bifidobacterium spp. in 0, 5, 10, 15, and 21% oxygen in a hypoxic glove box. The metabolic responses of each probiotic strain in the different oxygen environments were monitored by measuring the levels of lactic acid and determining the lactate-to-acetate ratio. Biochemical changes induced by oxygen were examined by monitoring the specific activities of NADH oxidase, NADH peroxidase, and superoxide dismutase. In addition, the ability to decompose hydrogen peroxide and the sensitivity of each strain to hydrogen peroxide was also determined. With an increase in oxygen...
26.
Metabolic and biochemical responses of probiotic bacteria to oxygen
- Talwalkar, Akshat; Kailasapathy, Kasipathy
The interaction between oxygen and probiotic bacteria was studied by growing Lactobacillus acidophilus and Bifidobacterium spp. in 0, 5, 10, 15, and 21% oxygen in a hypoxic glove box. The metabolic responses of each probiotic strain in the different oxygen environments were monitored by measuring the levels of lactic acid and determining the lactate-to-acetate ratio. Biochemical changes induced by oxygen were examined by monitoring the specific activities of NADH oxidase, NADH peroxidase, and superoxide dismutase. In addition, the ability to decompose hydrogen peroxide and the sensitivity of each strain to hydrogen peroxide was also determined. With an increase in oxygen...
27.
Procedimiento para el ensayo de antimicrobianos frente a bacterias que crecen en biocapas
- Amorena Zabalza, Beatriz; Gracia Currás, Elena; Conchello Moreno, Pilar; Fernández Casanovas, Antonio
Referencia OEPM: P9601400.-- Fecha de solicitud: 21/06/1996.-- Titulares: Consejo Superior de Investigaciones Científicas (CSIC), Diputación General de Aragón (Servicio de Investigación y Tecnología Agroalimentaria).
28.
Bacteria in their relation to vegetable tissue.
- Russell, Harry Luman.
2 p. L., 41 p.
29.
The isolation, growth and survival of thermophilic bacteria from high temperature petroleum reservoirs
- Grassia, Gino Sebastian
The microbial ecology of 45 high temperature (> 50 ° C) petroleum reservoirs was
investigated by isolating and characterizing bacteria that were present in their produced
fluids. Initial work was aimed at selecting a suitable high temperature petroleum
reservoir for the study of natural microbial populations. Experimental work then
focussed on establishing the physico-chemical conditions that prevail in the selected
reservoir and on developing media and enrichment conditions for the isolation of
microorganisms indigenous to the reservoir. The ability of reservoir bacteria to grow
and survive under the physical and chemical conditions found in the selected reservoir
was used to assess the likelihood of an indigenous origin for...
30.
Atividade antimicrobiana de bactérias lácticas isoladas de queijo-de-minas artesanal do Serro (MG) frente a microrganismos indicadores
- Alexandre,D.P.; Silva,M.R.; Souza,M.R.; Santos,W.L.M.
Isolaram-se 192 cepas de bactérias lácticas de cinco amostras de queijo-de-minas artesanal, oriundos da região do Serro, MG. Os resultados da prova de inibição direta indicaram que 48 cepas isoladas (25%) foram capazes de inibir o crescimento in vitro de microrganismos indicadores, dentre os quais Staphylococcus aureus e Listeria monocytogenes. As 48 cepas foram submetidas à prova de inibição indireta. Verificou-se que 20,8% (10/48) das cepas demonstraram amplo espectro antimicrobiano frente a microrganismos como: Salmonella enteritidis var. typhimurium, Staphylococcus aureus, Listeria monocytogenes e Listeria innocua. Nenhuma das cepas isoladas foi capaz de inibir Escherichia coli.
31.
Bacteria isolated from a sugarcane agroecosystem: their potential production of polyhydroxyalcanoates and resistance to antibiotics
- Lima,Teresa Cristina S. de; Grisi,Breno M.; Bonato,M. Christina M.
In this investigation, a sugarcane agroecosystem at a coastal tableland, in the northeast of Brazil, was screened to obtain bacteria strains able to synthesize poly-
b-hydroxyalkanoates (PHA), using sucrose as the main carbon source. The potential to synthesize PHA was tested qualitatively by Sudan Black staining of colonies growing in different carbon sources: sucrose, glucose, fructose, propionate and cellulose. In a typical sugarcane crop management system, the plantation is burned before harvesting and vinasse, a byproduct of alcohol production, is used in a fertirrigation system causing, probably, selective pressures on the microbiota of natural environments. Eightytwo bacteria strains, belonging to...
32.
Molecular analysis of endophytic bacteria from the genus Bacillus isolated from tropical maize (Zea mays L.)
- Figueiredo,José Edson Fontes; Gomes,Eliane Aparecida; Guimarães,Claudia Teixeira; Lana,Ubiraci Gomes de Paula; Teixeira,Marta Aparecida; Lima,Guilherme Vitor Corrêa; Bressan,Wellington
Endophytic bacteria play an important role in agriculture by improving plant performance and adaptation against biotic and abiotic stresses. In the present study molecular methods were used for identifying Bacillus endophytic bacteria isolated from Brazilian sweet corn. SDS-PAGE of wholecell protein extract of fortytwo isolates revealed a high number of scrutinable bands. Twenty-four isolates were identified in nine different groups of duplicated bacteria and eighteen were identified as unique. Some high-accumulated polipeptides with variable length were observed in almost isolates. Partial sequencing of 16S ribosomal gene revealed that all isolates are Bacillus sp. and among thirteen isolates with similar protein...
33.
ANTIBIOTIC RESISTANT BACTERIA ISOLATED FROM THE AIR OF SWINE CONFINEMENT OPERATIONS
- GIBBS, SHAWN G.
The creation of antibiotic resistant bacteria is a global problem that the United States is just now starting to address. The hospital costs of antibiotic resistance are estimated to be hundreds of millions of dollars a year to treat, and they jeopardize the health of the human or animal that is infected. The inhalation of large amounts of airborne microorganisms is also a problem when dealing with those that work with or live in proximity to animal confinement units. It has been shown that the inhalation of large numbers of microorganisms creates a variety of adverse human health effects. The...
34.
Efeito fungistático de Bacillus thuringiensis e de outras bactérias sobre alguns fungos fitopatogênicos
- Batista Junior,Carlos Brasil; Albino,Ulisses Brigatto; Martines,Alexandre Martin; Saridakis,Dennis Panayotes; Matsumoto,Leopoldo Sussumu; Avanzi,Marco Antonio; Andrade,Galdino
Quatro isolados bacterianos da rizosfera de Drosera villosa var. villosa (B1, B2, B3, B4) e dois isolados de Bacillus thuringiensis (B5 e B6), sendo B6 produtor da toxina bioinseticida Cry1Ab, foram avaliados quanto à capacidade de inibir os fungos fitopatogênicos Fusarium solani f. sp. phaseoli, Fusarium solani f. sp. glycines, Fusarium oxysporum e Colletotrichum sp. A cepa mais efetiva foi B1 que inibiu o crescimento dos quatro fungos até o 26º dia. B. thuringiensis inibiu o crescimento de três destes, o que indica que possui atividade antifúngica e abre um novo campo de estudo para a utilização do B. thuringiensis.
35.
Direct RAPD evaluation of bacteria without conventional DNA extraction
- Araújo,Welington Luiz; Angellis,Derlene Attili de; Azevedo,João Lúcio
The present work reports successful DNA amplification of Pantoea agglomerans and Bacillus pumilus through Random Amplified Polymorphic DNA (RAPD). For this, template DNA was obtained without conventional DNA extraction. The procedure was as follows: cultures grown for 20 hours in 5 mL LB medium were centrifuged and the resulting preparation was suspended in TE buffer. After boiling, the cell suspension was diluted and 2.0 µl were used in reactions of 15 µl. The results showed no significant differences among the RAPD profile of the PCR reactions derived from the boiling and phenol extraction methods, suggesting the utilization of this method...
36.
Screening for exopolysaccharide-producing bacteria from sub-tropical polluted groundwater
- FUSCONI,R.; GODINHO,M. J. L.
A selection of exopolysaccharide (EPS) -- producing bacterial strains was conducted in groundwater adjacent to an old controlled landfill in the City of São Carlos (São Paulo, Brazil). The strains were isolated in P and E media under aerobic and microaerophilic conditions at 25ºC. A total of 26 strains were isolated and based on the mucoid mode of the colonies, 6 were selected and their morphological, physiological and biochemical aspects were characterized. All strains presented pigmentation, ranging from yellow to orange and from pink to salmon, with a shiny glistening aspect in all tested media. Strains Lb, Lc and Lg,...
37.
Bacterias heterótrofas en manantiales termales / Félix Daniel Andueza Leal
- Andueza Leal, Félix Daniel; Universidad de Los Andes. Facultad de Farmacia y Bioanálisis, Trabajo de Ascenso, 2003
Mecanografiado
38.
Uso de bacterias sulfato-reductoras
inmovilizadas para la precipitación de
metales pesados
- Vicente, María Soledad; Facultad de Ciencias Exactas
39.
Seleção e utilização de bacterias lacticas produtoras de diacetil em leites fermentados
- Eliane Melo Brolazo
Nao informado
40.
Proposta de automatização do sistema de contagem de bacterias em leite
- Andre Mauricio Teixeira
Os aparatos de laboratórios para análise que são usados para suprir as necessidades do Brasil na avaliação da qualidade do leite, são em sua maioria importados. O Departamento de Microeletrônica da Faculdade de Engenharia Elétrica e de Computação e a Faculdade de Engenharia de Alimentos da UNICAMP estão trabalhando com uma proposta de avaliação da contagem microbiológica no leite através de um método de contagem confiável, rápido e de forma automatizada. Hoje no Brasil utiliza-se o método de contagem em placas como padrão para a contagem microbiológica no leite e, com o tipo mais simples destes testes, leva-se pelo menos...
