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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
23/01/2017 |
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Data da última atualização: |
30/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SANTOS, F. F. dos; MENDONCA, L. C.; REIS, D. R. de L.; GUIMARAES, A. S.; LANGE, C. C.; RIBEIRO, J. B.; MACHADO, M. A.; BRITO, M. A. V. P. e. |
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Afiliação: |
Fernanda Fernandes dos Santos, UFJF; LETICIA CALDAS MENDONCA, CNPGL; DANIELE RIBEIRO DE LIMA REIS FAZA, CNPGL; ALESSANDRO DE SA GUIMARAES, CNPGL; CARLA CHRISTINE LANGE, CNPGL; JOAO BATISTA RIBEIRO, CNPGL; MARCO ANTONIO MACHADO, CNPGL; MARIA APARECIDA V PAIVA E BRITO, CNPGL. |
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Título: |
Presence of mecA-positive multidrug-resistant Staphylococcus epidermidis in bovine milk samples in Brazil. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Journal of Dairy Science, v. 99, n. 2, p. 1374-1382, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract Bacteria of the genus Staphylococcus are one of the major pathogens causing bovine mastitis. In recent decades, resistance of this genus to oxacillin (methicillin) has been a matter of concern due to the possibility of reducing the effectiveness of mastitis treatments and the transfer of resistance determinants to other bacteria. Oxacillin resistance was studied in 170 staphylococci from bovine milk samples, including 79 Staphylococcus aureus and 91 coagulase-negative staphylococci (CNS). The susceptibility profile of 10 antimicrobial agents used in veterinary practice was determined by the Etest method. In addition to the Etest, the phenotypic characterization of oxacillin resistance was tested using the cefoxitin disk diffusion test. All isolates were screened by PCR to detect the mecA gene in 2 different regions of the gene. The isolates with an oxacillin minimum inhibitory concentration ≥0.5 µg/mL or resistant to cefoxitin were identified by sequencing a 536-bp fragment of the 16S rRNA gene. This group of isolates was also evaluated for the presence of blaZ and mecC genes. Molecular analysis of the mecA gene was carried out by typing of the staphylococcal cassette chromosome mec (SCCmec). The relatedness of the mecA-positive isolates was evaluated by macrorestriction of chromosomal DNA followed by pulsed-field gel electrophoresis. With the exception of penicillin and oxacillin, 86% of the isolates showed susceptibility to cephalothin, gentamicin, erythromycin, sulfonamide, trimethoprim-sulfamethoxazole, and tetracycline. All S. aureus isolates were susceptible to oxacillin, whereas 47% (n = 43) of the CNS isolates were resistant. The CNS isolates showed a higher resistance to cephalothin, erythromycin, tetracycline, and gentamicin in comparison with S. aureus. The mecA gene was only detected in 10 CNS isolates, identified as Staphylococcus epidermidis, and classified into 3 pulsotypes (A, B, and C) and 4 subtypes (A1, B1, B2, and B3). Among the isolates with an oxacillin resistance phenotype, 12 were positive for the blaZ gene, and 9 of them were mecA-positive. Two of the oxacillin-resistant isolates amplified the mecA homolog gene of Staphylococcus sciuri and none amplified mecC. Three SCCmec types, I, IV, and V, were found. Our results suggest that Staphylococcus epidermidis can be a reservoir for mecA for other Staphylococcus species. Studies investigating the molecular and phenotypic profile of antimicrobial resistance in staphylococcal species should be performed for controlling the spread of resistance and the selection of appropriate therapeutic measures. MenosAbstract Bacteria of the genus Staphylococcus are one of the major pathogens causing bovine mastitis. In recent decades, resistance of this genus to oxacillin (methicillin) has been a matter of concern due to the possibility of reducing the effectiveness of mastitis treatments and the transfer of resistance determinants to other bacteria. Oxacillin resistance was studied in 170 staphylococci from bovine milk samples, including 79 Staphylococcus aureus and 91 coagulase-negative staphylococci (CNS). The susceptibility profile of 10 antimicrobial agents used in veterinary practice was determined by the Etest method. In addition to the Etest, the phenotypic characterization of oxacillin resistance was tested using the cefoxitin disk diffusion test. All isolates were screened by PCR to detect the mecA gene in 2 different regions of the gene. The isolates with an oxacillin minimum inhibitory concentration ≥0.5 µg/mL or resistant to cefoxitin were identified by sequencing a 536-bp fragment of the 16S rRNA gene. This group of isolates was also evaluated for the presence of blaZ and mecC genes. Molecular analysis of the mecA gene was carried out by typing of the staphylococcal cassette chromosome mec (SCCmec). The relatedness of the mecA-positive isolates was evaluated by macrorestriction of chromosomal DNA followed by pulsed-field gel electrophoresis. With the exception of penicillin and oxacillin, 86% of the isolates showed susceptibility to cephalothin, gentamicin, ery... Mostrar Tudo |
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Palavras-Chave: |
Antimicrobial resistance; MecA; Methicillin-resistant staphylococci; SCCmec. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03425naa a2200253 a 4500
001 2061479
005 2023-01-30
008 2016 bl uuuu u00u1 u #d
100 1 $aSANTOS, F. F. dos
245 $aPresence of mecA-positive multidrug-resistant Staphylococcus epidermidis in bovine milk samples in Brazil.$h[electronic resource]
260 $c2016
520 $aAbstract Bacteria of the genus Staphylococcus are one of the major pathogens causing bovine mastitis. In recent decades, resistance of this genus to oxacillin (methicillin) has been a matter of concern due to the possibility of reducing the effectiveness of mastitis treatments and the transfer of resistance determinants to other bacteria. Oxacillin resistance was studied in 170 staphylococci from bovine milk samples, including 79 Staphylococcus aureus and 91 coagulase-negative staphylococci (CNS). The susceptibility profile of 10 antimicrobial agents used in veterinary practice was determined by the Etest method. In addition to the Etest, the phenotypic characterization of oxacillin resistance was tested using the cefoxitin disk diffusion test. All isolates were screened by PCR to detect the mecA gene in 2 different regions of the gene. The isolates with an oxacillin minimum inhibitory concentration ≥0.5 µg/mL or resistant to cefoxitin were identified by sequencing a 536-bp fragment of the 16S rRNA gene. This group of isolates was also evaluated for the presence of blaZ and mecC genes. Molecular analysis of the mecA gene was carried out by typing of the staphylococcal cassette chromosome mec (SCCmec). The relatedness of the mecA-positive isolates was evaluated by macrorestriction of chromosomal DNA followed by pulsed-field gel electrophoresis. With the exception of penicillin and oxacillin, 86% of the isolates showed susceptibility to cephalothin, gentamicin, erythromycin, sulfonamide, trimethoprim-sulfamethoxazole, and tetracycline. All S. aureus isolates were susceptible to oxacillin, whereas 47% (n = 43) of the CNS isolates were resistant. The CNS isolates showed a higher resistance to cephalothin, erythromycin, tetracycline, and gentamicin in comparison with S. aureus. The mecA gene was only detected in 10 CNS isolates, identified as Staphylococcus epidermidis, and classified into 3 pulsotypes (A, B, and C) and 4 subtypes (A1, B1, B2, and B3). Among the isolates with an oxacillin resistance phenotype, 12 were positive for the blaZ gene, and 9 of them were mecA-positive. Two of the oxacillin-resistant isolates amplified the mecA homolog gene of Staphylococcus sciuri and none amplified mecC. Three SCCmec types, I, IV, and V, were found. Our results suggest that Staphylococcus epidermidis can be a reservoir for mecA for other Staphylococcus species. Studies investigating the molecular and phenotypic profile of antimicrobial resistance in staphylococcal species should be performed for controlling the spread of resistance and the selection of appropriate therapeutic measures.
653 $aAntimicrobial resistance
653 $aMecA
653 $aMethicillin-resistant staphylococci
653 $aSCCmec
700 1 $aMENDONCA, L. C.
700 1 $aREIS, D. R. de L.
700 1 $aGUIMARAES, A. S.
700 1 $aLANGE, C. C.
700 1 $aRIBEIRO, J. B.
700 1 $aMACHADO, M. A.
700 1 $aBRITO, M. A. V. P. e
773 $tJournal of Dairy Science$gv. 99, n. 2, p. 1374-1382, 2016.
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Embrapa Gado de Leite (CNPGL) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Mandioca e Fruticultura. Para informações adicionais entre em contato com cnpmf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
24/04/2006 |
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Data da última atualização: |
24/04/2006 |
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Autoria: |
FONSECA, N.; CASTRO NETO, M. T.; LEDO, C. A. da S. |
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Afiliação: |
EMBRAPA-CNPMF. |
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Título: |
Paclobutrazol no florescimento e na produção da mangueira 'Tommy Atkins'. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Ciência e Agrotecnologia, Lavras, v. 28, n. 4, p. 807-814, jul./ago. 2004 |
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Idioma: |
Português |
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Conteúdo: |
Técnicas eficientes de controle da época de produção são importantes para o sucesso econômico no cultivo de mangueira (Mangifera indica L.). Neste estudo, avaliaram-se o florescimento e a produção da mangueira 'Tommy' Atkins' em resposta à aplicação de paclobutrazol (PBZ) no solo (2 mL do i.a./planta), e foliar em diferentes doses (0,5, 1, 1,5 e 2 mL do i.a. em aplicação única e em duas aplicações) sob condições de cultivo irrigado, na região semi-árida do Nordeste do Brasil. As variáveis estudadas foram percentual de florescimento. número de frutos e produção por planta, sendo avaliadas três épocas após a aplicação do regulador de crescimento (68 a 110, 131 a 179 e 190 a 216 dias após para o florescimento da planta; e 162 a 203, 256 a 287 e 327 a 337 para o número e produção de frutos por planta). O PBZ aplicado no solo determinou percentuais de florescimento, número de frutos e produção por planta superiores à testemunha (água foliar) e aos tratamentos com PBZ foliar, além de antecipar o florescimento das plantas. O PBZ foliar, independentemente do número de aplicação e doses usadas, não superou significativamente a testemunha. O PBZ aplicado no solo antecipou o florescimento em 23, em relação à testemunha aos tratamentos com PBZ foliar, na segunda época de avaliação. |
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Palavras-Chave: |
PBZ. |
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Thesagro: |
Mangifera Indica; Regulador de Crescimento. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01874naa a2200181 a 4500
001 1652439
005 2006-04-24
008 2004 bl uuuu u00u1 u #d
100 1 $aFONSECA, N.
245 $aPaclobutrazol no florescimento e na produção da mangueira 'Tommy Atkins'.
260 $c2004
520 $aTécnicas eficientes de controle da época de produção são importantes para o sucesso econômico no cultivo de mangueira (Mangifera indica L.). Neste estudo, avaliaram-se o florescimento e a produção da mangueira 'Tommy' Atkins' em resposta à aplicação de paclobutrazol (PBZ) no solo (2 mL do i.a./planta), e foliar em diferentes doses (0,5, 1, 1,5 e 2 mL do i.a. em aplicação única e em duas aplicações) sob condições de cultivo irrigado, na região semi-árida do Nordeste do Brasil. As variáveis estudadas foram percentual de florescimento. número de frutos e produção por planta, sendo avaliadas três épocas após a aplicação do regulador de crescimento (68 a 110, 131 a 179 e 190 a 216 dias após para o florescimento da planta; e 162 a 203, 256 a 287 e 327 a 337 para o número e produção de frutos por planta). O PBZ aplicado no solo determinou percentuais de florescimento, número de frutos e produção por planta superiores à testemunha (água foliar) e aos tratamentos com PBZ foliar, além de antecipar o florescimento das plantas. O PBZ foliar, independentemente do número de aplicação e doses usadas, não superou significativamente a testemunha. O PBZ aplicado no solo antecipou o florescimento em 23, em relação à testemunha aos tratamentos com PBZ foliar, na segunda época de avaliação.
650 $aMangifera Indica
650 $aRegulador de Crescimento
653 $aPBZ
700 1 $aCASTRO NETO, M. T.
700 1 $aLEDO, C. A. da S.
773 $tCiência e Agrotecnologia, Lavras$gv. 28, n. 4, p. 807-814, jul./ago. 2004
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