Consulta: subjectFacets:"Proteus mirabilis"
Registros recuperados: 7
Data/hora: 09/06/2024 13:45:29

L'histamine comme indicateur d'alteration.
Provedor de dados: 5
Autores: Nerisson, P.
In this study, the author tries to explain conditions of histamine formation in fish and their results for the public health. Then he gives some results of analysis effected on manufactory conserves.
Tipo: Text
Palavras-chave: Parathunnus mebachi; Proteus morganii; Proteus mirabilis; Proteus vulgaris; Achromobacter histamineum; Processing fishery products; Biological poisons; Bacterial diseases.
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-2033.pdf

Comparison of PCR-based molecular markers for the characterization of Proteus mirabilis clinical isolates
Provedor de dados: 55
Autores: Michelim,Lessandra; Muller,Gabriela; Zacaria,Jucimar; Delamare,Ana Paula Longaray; Costa,Sérgio Olavo Pinto da; Echeverrigaray,Sergio.
Proteus mirabilis is one of the most important pathogens associated with complicated urinary tract infections (acute pyelonephritis, bladder infections, kidney stones) and bacteremia, affecting patients with anatomical abnormalities, immunodeficiency, and long-term urinary catheterization. For epidemiological purposes, various molecular typing methods, such as pulse-field gel electrophoresis (PFGE) or ribotyping, have been developed for this pathogen. However, these methods are labor intensive and time-consuming. We evaluated the discriminatory power of several PCR-based fingerprinting methods (RAPD, ISSR, ERIC-PCR, BOX-PCR and rep-PCR) for P. mirabilis clinical isolates. Typing patterns and clustering analysis indicated that RAPD, BOX-PCR and ERIC-PCR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proteus mirabilis; Molecular markers; Fingerprinting; PCR.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702008000500014

Mini-Mu insertions in the tetracycline resistance determinant from Proteus mirabilis
Provedor de dados: 56
The inducible tetracycline resistance determinant isolated from Proteus mirabilis cloned into the plasmid pACYC177 was mutagenized by insertion of a mini-Mu-lac phage in order to define the regions in the cloned sequences encoding the structural and regulatory proteins. Three different types of mutants were obtained: one lost the resistance phenotype and became Lac+; another expressed the resistance at lower levels and constitutively; the third was still dependent on induction but showed a lower minimal inhibitory concentration. The mutant phenotypes and the locations of the insertions indicate that the determinant is composed of a repressor gene and a structural gene which are not transcribed divergently as are other known tetracycline determinants...
Palavras-chave: Tetracycline; Mutation; LacZ-fusion; Proteus mirabilis; Bacteriophage Mu.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000300009

Development of an operational substrate for ZapA, a metalloprotease secreted by the bacterium Proteus mirabilis
Provedor de dados: 56
Autores: Fernandes,B.L.; Anéas,M.A.F.; Juliano,L.; Palma,M.S.; Lebrun,I.; Portaro,F.C.V.
The protease ZapA, secreted by Proteus mirabilis, has been considered to be a virulence factor of this opportunistic bacterium. The control of its expression requires the use of an appropriate methodology, which until now has not been developed. The present study focused on the replacement of azocasein with fluorogenic substrates, and on the definition of enzyme specificity. Eight fluorogenic substrates were tested, and the peptide Abz-Ala-Phe-Arg-Ser-Ala-Ala-Gln-EDDnp was found to be the most convenient for use as an operational substrate for ZapA. A single peptide bond (Arg-Ser) was cleaved with a Km of 4.6 µM, a k cat of 1.73 s-1, and a catalytic efficiency of 376 (mM s)-1. Another good substrate for ZapA was peptide 6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metalloprotease; Substrate specificity; Quenched fluorescence peptides; Proteus mirabilis.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000700006

ZapA, a possible virulence factor from Proteus mirabilis exhibits broad protease substrate specificity
Provedor de dados: 56
Autores: Anéas,M.A.F.; Portaro,F.C.V.; Lebrun,I.; Juliano,L.; Palma,M.S.; Fernandes,B.L.
The opportunistic bacterium Proteus mirabilis secretes a metalloprotease, ZapA, considered to be one of its virulence factors due to its IgA-degrading activity. However, the substrate specificity of this enzyme has not yet been fully characterized. In the present study we used fluorescent peptides derived from bioactive peptides and the oxidized ß-chain of insulin to determine the enzyme specificity. The bradykinin- and dynorphin-derived peptides were cleaved at the single bonds Phe-Ser and Phe-Leu, with catalytic efficiencies of 291 and 13 mM/s, respectively. Besides confirming already published cleavage sites, a novel cleavage site was determined for the ß-chain of insulin (Val-Asn). Both the natural and the recombinant enzyme displayed the same broad...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proteus mirabilis; Metalloprotease; Substrate specificity; Fluorogenic peptides; IgA; Insulin ß-chain.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001001100004

Proteus mirabilis biofilm - Qualitative and quantitative colorimetric methods-based evaluation
Provedor de dados: 58
Autores: Kwiecinska-Piróg,Joanna; Bogiel,Tomasz; Skowron,Krzysztof; Wieckowska,Ewa; Gospodarek,Eugenia.
Proteus mirabilis strains ability to form biofilm is a current topic of a number of research worldwide. In this study the biofilm formation of P. mirabilis strains derived from urine of the catheterized and non-catheterized patients has been investigated. A total number of 39 P. mirabilis strains isolated from the urine samples of the patients of dr Antoni Jurasz University Hospital No. 1 in Bydgoszcz clinics between 2011 and 2012 was used. Biofilm formation was evaluated using two independent quantitative and qualitative methods with TTC (2,3,5-triphenyl-tetrazolium chloride) and CV (crystal violet) application. The obtained results confirmed biofilm formation by all the examined strains, except quantitative method with TTC, in which 7.7% of the strains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proteus mirabilis; Biofilm; Colorimetric methods.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400037

Isolation and purification of complex II from proteus mirabilis strain ATCC 29245
Provedor de dados: 58
Autores: Shabbiri,Khadija; Ahmad,Waqar; Syed,Quratulain; Adnan,Ahmad.
A respiratory complex was isolated from plasma membrane of pathogenic Proteus mirabilis strain ATCC 29245. It was identified as complex II consisting of succinate:quinone oxidoreductase (EC 1.3.5.1) containing single heme b. The complex II was purified by ion-exchange chromatography and gel filtration. The molecular weight of purified complex was 116.5 kDa and it was composed of three subunits with molecular weights of 19 kDa, 29 kDa and 68.5 kDa. The complex II contained 9.5 nmoles of cytochrome b per mg protein. Heme staining indicated that the 19 kDa subunit was cytochrome b. Its reduced form showed absorptions peaks at 557.0, 524.8 and 424.4 nm. The α-band was shifted from 557.0 nm to 556.8 nm in pyridine ferrohemochrome spectrum. The succinate:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proteus mirabilis; Complex II; Cytochrome b.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000300032