Linked Life Data

1663926

Source:http://linkedlifedata.com/resource/pubmed/id/1663926

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1992-3-9
pubmed:abstractText
The NCTC type strains of Escherichia coli, Enterobacter cloacae, Serratia marcescens and Klebsiella pneumoniae were exposed to 3, 5 and 10 x MIC of nalidixic acid, enoxacin, ciprofloxacin, PD 117596 and PD 127391. From each strain a mutant with a high MIC of quinolones alone (gyrA) and a mutant with intermediate resistance to quinolones, some beta-lactams, chloramphenicol and tetracycline (multiply resistant, m-r) were selected on agar containing antibiotics. The gyrA mutants required a higher concentration of quinolone to inhibit DNA synthesis by 50% but quinolone uptake kinetics and outer membrane profile were the same as the wild type. The m-r mutants had similar DNA synthesis IC50 as the wild type, decreased quinolone uptake kinetics and had decreased expression of an OMP of approximately 40 kD. The gyrA and m-r mutants were then exposed to 3, 5 and 10 x MIC of the same quinolones and new mutants (F2) selected. The F2 mutants from the gyrA mutants displayed a further increase in quinolone MIC; the F2 mutants from the m-r mutants had several phenotypes: high quinolone MICs with cross resistance to other agents, high quinolone resistance alone, or intermediate quinolone resistance alone. Most F2 mutants had MICs above the recommended breakpoint concentrations for quinolones. The F2 mutants often had altered biochemical profiles (API 20E), however, only in the case of E. cloacae did this affect speciation with the strains being identified as Rhanella aquatalis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0305-7453
pubmed:author
pubmed:issnType
Print
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
185-98
pubmed:dateRevised
2008-7-23
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Phenotypic characterization of quinolone-resistant mutants of Enterobacteriaceae selected from wild type, gyrA type and multiply-resistant (marA) type strains.
pubmed:affiliation
Medical School, University of Birmingham, UK.
pubmed:publicationType
Journal Article, Comparative Study