Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Subinhibitory"”.
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The effect of subinhibitory concentrations of antibiotics on virulence factors of <i>Staphylococcus aureus</i> biofilms
Staphylococci are normal colonizers of human and animal skin and mucous membranes. However, <i>S. aureus</i> is one of the most pathogenic bacteria isolated from humans. <i>S. aureus</i> produces numerous virulence factors that are responsible for the pathogenicity of this microorganism. Exposure …
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Molecular investigation of the influence of environmental factors and subinhibitory antibiotic concentrations on the biofilm formation in Staphylococcus epidermidis
… significantly enhanced the biofilm production. Subinhibitory concentrations of tetracyline, the semisynthetic streptogramin quinupristin/dalfopristin and the streptogramin growth promoter virginiamycin were found to enhance the ica expression 8 to 11-fold, respectively, whereas penicillin, …
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Aplicação combinada de quitosana e óleo essencial de Mentha piperita L. no controle de fungos patógenos pós-colheita.
… from M. piperita L., in distinct inhibitory and subinhibitory concentrations caused significant reduction in the growth of A. flavus, A. niger, R. stolonifer, B. cinerea e P. expansum (>96%). The inhibition of the spores germination also achieved expressive values (>90%) in all the …
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Molecular typing of virulence genes in enterotoxigenic Bacillus cereus
… of nheA expression, when cells were subjected to subinhibitory levels of chloramphenicol as a stressor. B. cereus demonstrated consistently high levels of nheA expression at 15 hours when grown in TSB containing subinhibitory concentration (SIC) chloramphenicol (15.625 mg/ml). Relative levels of …
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The influence of non-inhibitory concentrations of purified pyocin S2 on Pseudomonas aeruginosa isolates
… used a variety of virulence assays to show that subinhibitory concentrations of this pyocin alter the virulence factor production of target P. aeruginosa isolates. In doing so, we also demonstrated that the effects of S2 on virulence factor production can vary for different strains. We further …
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Substandard antimicrobial drugs: detection methods and their contributions to antibiotic resistance
… analyzing each drug’s unique interactions. While subinhibitory drug doses are known to select for antimicrobial resistance in vitro, the role of substandard anti-mycobacterial medicines in the development of rifampicin resistance remains poorly understood. The role of the drug degradation product …
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Investigations into quinolone and fluoroquinolone resistance in Salmonella enterica
… method. By exposing susceptible isolates to subinhibitory concentrations of fluoroquinolones, resistant mutants were selected. Amplification and sequencing of the topoisomerase genes gyrA and parC was performed on a number of these mutants in an attempt to characterize the mutations. The …
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Investigating the role of nonantibiotic chemical contaminants in the evolution of antibiotic resistance
… (2) the coexposure to pesticides (in μg/L) and a subinhibitory level (in high μg/L) of the antibiotic, ampicillin, synergistically stimulated the selection of ampicillin resistance and the cross-resistance to other antibiotics. Using genomic and transcriptome analysis, I have identified distinct …