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Registros recuperados: 278
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A DNA pooling based system to detect Escherichia coli virulence factors in fecal and wastewater samples BJM
Luz María Chacón,J; Lizeth Taylor,C; Carmen Valiente,A; Irene Alvarado,P; Ximena Cortés,B.
The availability of a useful tool for simple and timely detection of the most important virulent varieties of Escherichia coli is indispensable. To this end, bacterial DNA pools which had previously been categorized were obtained from isolated colonies as well as selected in terms of utilized phenotype; the pools were assessed by two PCR Multiplex for the detection of virulent E. coli eaeA, bfpA, stx1, stx2, ipaH, ST, LT, and aatA genes, with the 16S gene used as DNA control. The system was validated with 66 fecal samples and 44 wastewater samples. At least one positive isolate was detected by a virulent gene among the 20 that were screened. The analysis of fecal samples from children younger than 6 years of age detected frequencies of 25% LT positive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Virulence genes; Wastewater; Fecal; Screening system; Escherichia coli.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400012
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A high-copy T7 Escherichia coli expression vector for the production of recombinant proteins with a minimal N-terminal His-tagged fusion peptide BJMBR
Ramos,C.R.R.; Abreu,P.A.E.; Nascimento,A.L.T.O.; Ho,P.L..
We report here the construction of a vector derived from pET3-His and pRSET plasmids for the expression and purification of recombinant proteins in Escherichia coli based on T7 phage RNA polymerase. The resulting pAE plasmid combined the advantages of both vectors: small size (pRSET), expression of a short 6XHis tag at N-terminus (pET3-His) and a high copy number of plasmid (pRSET). The small size of the vector (2.8 kb) and the high copy number/cell (200-250 copies) facilitate the subcloning and sequencing procedures when compared to the pET system (pET3-His, 4.6 kb and 40-50 copies) and also result in high level expression of recombinant proteins (20 mg purified protein/liter of culture). In addition, the vector pAE enables the expression of a fusion...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Escherichia coli; Expression vector; Immobilized metal affinity chromatography; Protein purification.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000800001
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A microbiological survey on tomatoes (Lycopersicon esculentum) marketed in Rio de Janeiro, Brazil. Repositório Alice
PENTEADO, A. L.; CASTRO, M. F. D. P. M. de; PAZIANOTTO, R. A. A..
Abstract: Fresh produce can be a possible source of microbiological contamination. In the past 20 years, several salmonellosis outbreaks due to the consumption of tomato have been reported, mainly in the USA. Organic raw vegetables pose a risk for the transmission of foodborne pathogens since they are often cultivated using manure as a fertilizer. The aim of this study was to conduct a survey of the presence of Salmonella spp, total coliforms and Escherichia coli on the surface of tomatoes from two different production systems. A total of 262 samples of organic and conventional tomatoes were collected from supermarkets and open street markets in the city of Rio de Janeiro, Brazil and analyzed for these microorganisms. To increase the probability of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Agricultura convencional; Vigilância sanitária; Sanitary surveillance; Salmonella; Tomate; Agricultura orgânica; Escherichia coli; Contaminação bacteriana; Análise microbiológica; Tomatoes; Bacterial contamination; Organic production; Conventional farming.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1061920
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A new sterile technique effective on capturing tramp ants for microbiological investigations Neotropical Entomology
Schuller,Lucia; Matté,Glavur R; Matté,Maria H.
Tramp ants are an outstanding group of organisms that have a definitive and important role in carrying pathogens. The purpose of this study was to develop a microbiological sterile technique of collecting ants from contaminated areas. The traps were composed of Petri dishes containing culture media, and were tested to verify the applicability of the system. A positive correlation between the microorganism growth and the presence of ants inside or around traps was observed. The technique described demonstrated to be useful to collect ants from different environments, helping the surveillance of pathogenic microorganisms that are of public health concern.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Public health; Pathogenic microorganism; Staphylococcus aureus; Klebsiella; Escherichia coli; Enterobacter.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000400023
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Action of peracetic acid on Escherichia coli and Staphylococcus aureus in suspension or settled on stainless steel surfaces BJM
Kunigk,Leo; Almeida,Maria C.B..
The efficiency of a commercial peracetic acid sanitizer on destruction of Staphylococcus aureus and Escherichia coli was evaluated using two distinct methods. The first method is the AOAC suspension test and the second is a method proposed by one of the authors in which the microbial cells are settled on a stainless steel surface and then treated with the sanitizer. The results showed that when in suspension S. aureus was more resistant to the sanitizer than E. coli. When S. aureus was settled on the stainless steel surface, the contact time between the sanitizer and the microorganisms to attain a 6.5 log reduction in the number of viable cells was three times greater than when the cells were in suspension.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Peracetic acid; Staphylococcus aureus; Escherichia coli; Stainless steel surface; Sanitizers.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000100009
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Actividad antibacteriana y citotoxicidad in vivo de extractos etanólicos de Bauhinia variegata L. (Fabaceae) Plantas Medicinales
Martínez,Maby M; Ocampo,Diana M; Galvis,Jhon H; Valencia,Andrea.
Introducción: diversas investigaciones han identificado el potencial biológico de diferentes compuestos como flavonoides, taninos, esteroides, naftoquinonas y sesquiterpenoides presentes en el género Bauhinia. Se ha reportado para la especie Bauhinia variegata la presencia de flavonoides con propiedades antidiabéticas y antivirales; sin embargo, el estudio del potencial antibacterial y citotóxico in vivo es incipiente, tanto para compuestos de flavonoides como de alcaloides. Objetivo: determinar la actividad antibacteriana y citotóxica in vivo de los extractos alcaloidales de Bauhinia variegata L. Métodos: se aplicó cromatografía de columna para la extracción y el aislamiento de los alcaloides presentes en las hojas de B. variegata. Extractos y fracciones...
Tipo: Journal article Palavras-chave: Alcaloides; Artemia salina; Bauhinia; Citotoxicidad; Escherichia coli.
Ano: 2011 URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962011000400002
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Adaptative responses of E-coli to marine environmental stresses. a modelling approach based on viability and dormancy concepts ArchiMer
Martin, Y; Troussellier, Marc; Bonnefont, Jl.
In an attempt to synthesize conceptual and experimental information on the behaviour of enteric bacteria in seawater, a mathematical model has been developed. This model is based on changes in intracellular metabolisable components depending an physiological responses of the cell when subjected to nutrient starvation, salinity stress and solar radiation. Following a strategy which takes into account short- and mid-term physiological adaptation and reversal processes, the cells can develop in different states: culturable (B-1), viable and definitively nonculturable (B-2), and reversibly dormant (B-3) cells. Model parameters were deduced either from original microcosm experiments, from literature data or calibration procedures. Validation of the model was...
Tipo: Text Palavras-chave: Escherichia coli; Eau de mer; Stress; États cellulaires; Modélisation; Escherichia coli; Seawater; Stress; Cellular states; Modelling.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43646/43224.pdf
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Alkaline gel electrophoresis assay to detect DNA strand breaks and repair mechanisms in Escherichia coli BABT
Mattos,José Carlos Pelielo de; Motta,Ellen Serri da; Oliveira,Márcia Betania Nunes de; Dantas,Flávio José da Silva; Araujo,Adriano Caldeira de.
Reactive oxygen species (ROS) can induce lesions in different cellular targets, including DNA. Stannous chloride (SnCl2) is a ROS generator, leading to lethality in Escherichia coli (E. coli), with the base excision repair (BER) mechanism playing a role in this process. Many techniques have been developed to detect genotoxicity, as comet assay, in eukaryotic cells, and plasmid DNA agarose gel electrophoresis. In this study, an adaptation of the alkaline gel electrophoresis method was carried out to ascertain the induction of strand breaks by SnCl2 in bacterial DNA, from E. coli BER mutants, and its repair pathway. Results obtained show that SnCl2 was able to induce DNA strand breaks in all strains tested. Moreover, endonuclease IV and exonuclease III play...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alkaline gel electrophoresis; Escherichia coli; Base excision repair; Stannous chloride; DNA strand breaks; Reactive oxygen species.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000700020
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Análise da imunogenicidade de uma proteína recombiante em camundongos BALB/c visando o desenvolvimento de vacina contra tristeza parasitária bovina. Repositório Alice
RIBEIRO, S. M.; ROSINHA, G. M. S.; SOARES, C. O.; SANTOS, L. R. dos; GOMES, J. S..
bitstream/item/166474/1/Analise-da-imunogenicidade-de-uma-proteina.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Babesia sp; Anaplasma marginale; Anticorpo; Antigeno; Linfocito; Tristeza parasitária; Vacina; Gado de corte; Imunogenética; Escherichia coli.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1079036
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Análise da qualidade higiênico-sanitária na linha de produção de queijo muçarela produzido em laticínio do Distrito Federal, Brasil MV&Z
Bueno, L. S.; Ribeiro, J. L.; Poggiani, S. S. C.; Fernandes, M. L.; Souza, S. O..
Os queijos devem ser produzidos com matéria-prima de boa qualidade e submetidos a um eficiente controle em todas as etapas de processamento. A fabricação do queijo envolve vários processos, como pasteurização do leite, coagulação, corte do coágulo, dessoragem, filagem, enformagem, salga, maturação e embalagem. A manipulação do produto, o qual entra em contato com diferentes equipamentos e superfícies, aumenta o risco de contaminação microbiológica. O presente trabalho foi delineado para avaliar a qualidade higiênico-sanitária do processo de fabricação da muçarela produzida em um laticínio da região do Distrito Federal, Brasil, quanto à presença de coliformes totais e termotolerantes. Foram obtidas 15 amostras inerentes às etapas de fabricação: leite cru,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coliformes totais; Coliformes termotolerantes; Contaminação; Escherichia coli.
Ano: 2016 URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/35025
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Análise microbiológica do queijo minas artesanal do Serro-MG, Brasil, produzido com e sem fermento natural MV&Z
Cunha, A. L. F. S.; Paiva, V. N.; Cabrini, C. C.; Vieira, P.; Pinto, M. S..
Os queijos Minas artesanais possuem grande importância econômica, social, ambiental e política para o estado de Minas Gerais, sendo responsáveis pelo sustento direto e indireto de mais de 35 mil famílias. Até o presente momento não existem estudos envolvendo a utilização do fermento natural na fabricação de queijos Minas artesanais. Sabe-se apenas que o mesmo é utilizado de forma indiscriminada em algumas regiões produtoras tradicionais onde alguns produtores utilizam poucos mililitros para cada 100 litros de leite enquanto outros utilizam até um litro para os mesmos 100 litros. Além disso, segundo os produtores, as perdas de produção são atribuídas à qualidade desse fermento natural. O presente trabalho avaliou o efeito da adição de fermento natural sobre...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Segurança Alimentar; Coliformes; Escherichia coli; Staphylococcus aureus.
Ano: 2016 URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/34810
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Analysis of virulence genes in Escherichia coli isolated from grated cheese Ciênc. Tecnol. Aliment.
Martins,Rodrigo Prado; Nakazato,Luciano; Dutra,Valéria; Leite,Domingos da Silva.
This research aimed to verify the presence of virulence genes in strains of Escherichia coli isolated from grated cheese sold in farmers' markets of Cuiabá-MT, Brazil. Forty samples of this food were submitted for microbiological analysis and 22 (55%) tested positive for E. coli. Next, 64 strains of E. coli were isolated from the positive samples and screened by the polymerase chain reaction (PCR) for the presence of the genes encoding the following virulence factors: stx1 and stx2 (verotoxin types 1 and 2), eae (intimin), lt1 (heat-labile toxin type 1), st1 (heat-stable toxin type 1), cnf1 and cnf2 (cytotoxic necrozing factor types 1 and 2), and cdtB (cytolethal distending toxin). All the isolates were negative for the genes stx1, stx2, eae, lt1, st1,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Escherichia coli; Virulence genes; Grated cheese; Cuiabá - MT.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000100014
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Antagonic effect of the inhibition of inducible nitric oxide on the mortality of mice acutely infected with Escherichia coli and Bacteroides fragilis BJMBR
Astolfi,R.S.; Khouri,D.G.; Brandizzi,L.I.V.; Ávila-Campos,M.J.; Andrade Jr.,H.F. de.
Sepsis, the leading cause of death in intensive care units, is associated with overproduction of nitric oxide (NO) due to inducible NO synthase (iNOS), responsible for some of the pathologic changes. Aminoguanidine (AG) is a selective iNOS inhibitor with reported inconsistent actions in sepsis. To investigate the influence of iNOS, we studied models of acute bacterial sepsis using acute challenges with aerobic (Escherichia coli) and anaerobic (Bacteroides fragilis) bacteria in the presence of AG. Six-week-old, 23 g, male and female BALB/c and C57Bl/6j mice, in equal proportions, were inoculated (ip) with bacteria in groups of 4 animals for each dose and each experiment in the absence or presence of AG (50 mg/kg, ip, starting 24 h before challenge and daily...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Nitric oxide; Sepsis; Experimental model; Bacterial infections; Escherichia coli; Bacteroides fragilis.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000300006
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ANTAGONISM AGAINST VIBRIO CHOLERAE BY BACTERIAL DIFFUSIBLE COMPOUND IN THE FECAL MICROBIOTA OF RODENTS Rev. Microbiol.
Silva,Simone Helena da; Vieira,Enio Cardillo; Nicoli,Jacques Robert.
In an ex vivo agar plate assay, we monitored the appearance of an inhibitory halo against Vibrio cholerae from the feces of Wistar and Fischer rats aged 10 to 42 days. The frequency of Wistar rats showing halo increased from 0% (10 days) to a maximum of 80.0% (29 days) and then decreased to 53.3% (42 days). A similar pattern was obtained with Fischer rats but with a lower intensity (maximum frequency of 50.0% by day 36). In a separate experiment, when Wistar rats were fed a low-protein diet for 7 days, the inhibitory halo decreased drastically. Three apparently different colony morphologies were isolated from the dominant fecal microbiota: a facultative anaerobe (FAN) and two strict anaerobes (SAN). The ex vivo inhibitory test showed a halo around the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vibrio cholerae; Escherichia coli; Streptococcus intermedius; Antagonism; Rodents.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141998000300016
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Antibacterial activity of Aroeira honeys produced in Minas-Gerais against bacteria of clinical importance Biological Sciences
Viana, Fabiana Ribeiro; Carmo, Luiz Simeão do; Bastos, Esther Margarida Alves Ferreira.
The biological activity of honey has been the subject of great scientific investigation. Bee products are widely used in folk medicine to treat human diseases due to their antibacterial and inhibitory potential action on different human pathogens. Ten honey samples produced by Apis mellifera in the northern of Minas Gerais state were tested against pathogenic microorganisms Staphylococcus aureus TSST (clinical isolated) and enterohaemorrhagic Escherichia coli ATCC 43895 for determination of their minimum inhibitory concentrations. The microdilution technique in broth Mueller-Hinton broth (MHB) was used in four concentrations (25, 12.5, 6.25 and 3.125%). There was a reduction of bacterial growth for the two target species at all concentrations tested. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bee products; Antibacterial activity; Staphylococcus aureus; Escherichia coli.
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/36766
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Antibacterial activity of α-terpineol may induce morphostructural alterations in Escherichia coli BJM
Li,Li; Shi,Chaofeng; Yin,Zhongqiong; Jia,Renyong; Peng,Lianci; Kang,Shuai; Li,Zhengwen.
The antibacterial effect of α-terpineol from Cinnamomum longepaniculatum (Gamble) N. Chao leaf essential oils were studied with special reference to the mechanism of inhibiting the standard strain of Escherichia coli (CMCC (B) 44102) growth at ultrastructural level. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) and time-kill curves of α-terpineol were determined; Escherichia coli was treated with α-terpineol and observed under a transmission electron microscope. The MIC and MBC values of α-terpineol were all 0.78 µL/mL, and time-kill curves showed the concentration-dependent. Under the transmission electron microscopy (TEM), Escherichia coli exposed to MIC levels of α-terpineol exhibited decreased cell size and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Α-terpineol; Escherichia coli; Antibacterial activity; TEM.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400035
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Antibiotic resistance patterns of pediatric community-acquired urinary infections BJID
Guidoni,Eliana Biondi Medeiros; Berezin,Eitan N.; Nigro,Stanley; Santiago,Nataly A; Benini,Vanda; Toporovski,Julio.
Knowledge about antimicrobial resistance patterns of the etiological agents of urinary tract infections (UTIs) is essential for appropriate therapy. Urinary isolates from symptomatic UTI cases attended at Santa Casa University Hospital of São Paulo from August 1986 to December 1989 and August 2004 to December 2005 were identified by conventional methods. Antimicrobial resistance testing was performed by Kirby Bauer's disc diffusion method. Among the 257 children, E. coli was found in 77%. A high prevalence of resistance was observed against ampicillin and TMP/SMX (55% and 51%). The antibiotic resistance rates for E. coli were: nitrofurantoin (6%), nalidixic acid (14%), 1st generation cephalosporin (13%), 3rd generation cephalosporins (5%), aminoglycosides...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Urinary tract infection; Pediatrics urinary tract infection; Bacterial resistance; Escherichia coli.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702008000400013
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Anti-Escherichia coli activity of Brazilian plant extracts: New trends in Veterinary research Arq. Bras. Med. Vet. Zootec.
Camargo,L.R.P.; Suffredini,I.B..
Escherichia coli é uma bactéria presente no trato intestinal de animais de sangue quente. Entretanto, a perda do equilíbrio em sua relação com o hospedeiro pode causar doenças que levam a perdas econômicas, quando se trata de animais de produção, e perdas incalculáveis, quando se trata de animais silvestres. O presente estudo testou diversos extratos aquosos e orgânicos, obtidos de plantas da Amazônia brasileira, contra Escherichia coli (ATCC 25922). Usando o ensaio de disco difusão em ágar Mueller-Hinton (DDA), foram testados 1.791 extratos quanto à sua atividade antibacteriana. Os extratos que mostraram halo de inibição de crescimento bacteriano foram testados no modelo da microdiluição em caldo (MDBC) contra uma suspensão bacteriana preparada na escala...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Escherichia coli; Plant extracts; Pathogenicity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000200041
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Antimicrobial activity of citrus oil agaisnt salmonella and escherichia coli growth. Repositório Alice
MALDONADE, I. R.; SANJINEZ-ARGANDONA, E. J.; GINANI, V. G..
In this overview, the aim of this work was to evaluate the effect of citrus oil to inhibit the growth of Escherichia coli and Salmonella, ?in vitro?, to be used as sanitizer to wash fresh - cut produce.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Escherichia coli; Salmonella; Oleo essencial.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/996478
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Antimicrobial activity of propolis and essential oils and synergism between these natural products J. Venom. Anim. Toxins incl. Trop. Dis.
Probst,IS; Sforcin,JM; VLM,Rall; Fernandes,AAH; Fernandes Júnior,A.
In the present study, Apis mellifera propolis and essential oils (EOs) obtained from aromatic plants were evaluated as alternative antimicrobials. We aimed to establish the antimicrobial activity of ethanolic extracts of propolis (EEP) from Apis mellifera and of EOs from Caryophyllus aromaticus, Zingiber officinale, Cinnamomum zeylanicum and Mentha piperita against 32 Staphylococcus aureus and Escherichia coli strains from human clinical specimens. The antimicrobials were diluted in agar and the minimal inhibitory concentrations (MIC) were found whereas MIC90% values were calculated. Time-kill curve assays using mixtures containing one quarter of MIC90% for EEP with all EOs as well cinnamon EO were performed. The cinnamon EO was found to be the most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apis mellifera; Aromatic plants; Ethanolic extract of propolis; Staphylococcus aureus; Escherichia coli.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992011000200006
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