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- W2005188081 abstract "The activity of eight aminoglycosides (amikacin, apramycin, arbekacin, gentamicin, kanamycin, neomycin, netilmicin and tobramycin) against a collection of 257 amoxicillin/clavulanic acid (AMC)-resistant Escherichia coli isolates was determined by microdilution. Aminoglycoside resistance rates, the prevalence of aminoglycoside-modifying enzyme (AME) genes, the relationship between AME gene detection and resistance phenotype to aminoglycosides, and the association of AME genes with mechanisms of AMC resistance in E. coli isolates in Spain were investigated. Aminoglycoside-resistant isolates were screened for the presence of genes encoding common AMEs [aac(3)-Ia, aac(3)-IIa, aac(3)-IVa, aac(6′)-Ib, ant(2″)-Ia, ant(4′)-IIa and aph(3′)-Ia] or 16S rRNA methylases (armA, rmtB, rmtC and npmA). In total, 105 isolates (40.9%) were resistant to at least one of the aminoglycosides tested. Amikacin, apramycin and arbekacin showed better activity, with MIC90 values of 2 mg/L (arbekacin) and 8 mg/L (amikacin and apramycin). Kanamycin presented the highest MIC90 (128 mg/L). The most common AME gene was aac(6′)-Ib (36 strains; 34.3%), followed by aph(3′)-Ia (31 strains; 29.5%), ant(2″)-Ia (29 strains; 27.6%) and aac(3)-IIa (23 strains; 21.9%). aac(3)-Ia, aac(3)-IVa, ant(4′)-IIa and the four methylases were not detected. The ant(2″)-Ia gene was usually associated with OXA-1 [21/30; 70%], whilst 23/25 (92%) strains producing CTX-M-15 had the aac(6′)-Ib gene. The most prevalent AME gene was aac(6′)-Ib (18/41; 44%) in nosocomial isolates, whilst ant(2″)-Ia and aph(3′)-Ia genes (20/64; 31%) were more frequent in strains of community origin. In 64.6% isolates the phenotypic profile correlated with the presence of commonly encountered AMEs." @default.
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- W2005188081 title "Effect of herbicides on growth, respiration and IAA biosynthesis in Arthrobacter sp." @default.
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- W2005188081 doi "https://doi.org/10.1016/0045-6535(79)90128-0" @default.
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