Results: 10

Antibiotic resistance of Enterococcus faecalis from persistent endodontic infections

Enterococci are important nosocomial pathogens due to their intrinsic multiresistance and the acquisition of new antibiotic resistance genes (ARG). Enterococcus faecalis has been shown to be one of the main pathogens in persistent endodontic infections, therefore, the main objective of this study was to ...

Screening of medium constituents for clavulanic acid production by Streptomyces clavuligerus

Braz. j. microbiol; 49 (4), 2018
ABSTRACT Clavulanic acid is a β-lactam compound with potent inhibitory activity against β-lactamases. Studies have shown that certain amino acids play essential roles in CA biosynthesis. However, quantitative evaluations of the effects of these amino acids are still needed in order to improve C...

Improvement of clavulanic acid production in Streptomyces clavuligerus F613-1 by using a claR-neo reporter strategy

Background: Streptomyces clavuligerus was the producer of clavulanic acid, claR, a pathway-specific transcriptional regulator in S. clavuligerus, positively regulates clavulanic acid biosynthesis. In this study, the promoter-less kanamycin resistance gene neo was fused with claR to obtain strain NEO from...

Overproduction of clavulanic acid by extractive fermentation

Electron. j. biotechnol; 18 (3), 2015
Background Clavulanic acid is an important beta-lactamase inhibitor produced as a secondary metabolite by the actinomycete Streptomyces clavuligerus. Clavulanic acid is chemically unstable; therefore, it is degraded during bacterial cultivation. In this work, the adsorbents clinoptilolite, activated carb...

Studies on the formation and synthetic mechanism of related substance G in potassium clavulanate production

Braz. j. pharm. sci; 51 (1), 2015
The objective of this study was to investigate the formation and synthetic mechanism of related substance G in potassium clavulanate production. The impurity in the potassium clavulanate final product, with a retention time of 13.5 min, was confirmed as related substance G by high performance liquid chro...

Studies on the formation and forming mechanism of the related substance E in potassium clavulanate production by HPLC-MS/MS

Braz. j. pharm. sci; 50 (2), 2014
The objective of this study was to investigate the formation and forming mechanism of the related substance E in potassium clavulanate production. The impurity with retention time of 11.1 min in potassium clavulanate final product was confirmed as the related substance E by high performance liquid chroma...

Utilização de sistemas poliméricos de duas fases aquosas (SPDFA) compostos por polietileno glicol/ácido poliacrílico (PEG/APA) para extração de ácido clavulânico

A viabilidade da produção em escala industrial de produtos biotecnológicos de interesse comercial e terapêutico, como os fármacos, depende significativamente das técnicas de separação e purificação utilizadas. A aplicação do sistema de duas fases aquosas (SDFA) é proposta como alternativa pa...

Resistencia a los antibióticos en Escherichia coli con beta-lactamasas de espectro extendido en un hospital de la Orinoquia colombiana

Infectio; 15 (3), 2011
Objetivo. Analizar la resistencia de Escherichia coli a los antibióticos de acuerdo con la presencia de beta-lactamasas de espectro extendido (BLEE). Materiales y métodos. Estudio descriptivo y de corte transversal, en el Hospital Departamental de Villavicencio, centro de atención de mediana y alta co...

Emergencia de la resistencia antibiótica debida a las β-lactamasas de espectro extendido (blee): detección, impacto clínico y epidemiología

Infectio; 11 (1), 2007
RESUMEN La rápida emergencia de la resistencia antimicrobiana debida a las BLEE tiene un impacto significativo en la salud pública. En los últimos 24 años ha suscitado un gran interés el conocimiento acerca de las BLEE, esta explosión de publicaciones abarca a todos los continentes y más de 30 pa...