In vitro activities of three kinds of antibiotics ...

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Title In vitro activities of three kinds of antibiotics against Staphylococcal biofilm and planktonic cultures.
Author(s) T. El-Banna, A. Abd El-Aziz, A. Abo-Kamar, A. Ghazal, R. AboZahra
Journal Section Title: Microbial, Algal, and Fungal Biochemistry, African Journal of Microbiology Research
Date 2010
Volume 4
Issue 21
Start page 2275
End page 2282
Abstract The aim of the present study is to det. the activities of three kinds of antibiotics against Staphylococcal biofilm and planktonic cultures in vitro, and to indicate the enhancement of biofilm formation in response to stress factors such as glucose and sub-inhibitory concns. of antibiotics by using scanning electron microscope. Biofilm forming staphylococci were identified by using the modified microtiter plate method. And the effect of different concns. of several antibiotics (including ciprofloxacin, gentamycin and amoxicillin-clavulanic acid) on eight isolates was detd. The result showed that out of 86 Staphylococcal isolates, eight strains were found to be strong biofilm forming. Sub-MIC of the antimicrobial agents used increased the biofilm formation in some isolates. However, the preformed biofilm was very difficult to remove with most isolates even with multiples of the MIC. The biofilm MBC reached 46 times the planktonic MBC in some isolates. Scanning electron micrographs of staphylococcus aureus isolate (45S) were made in order to confirm the enhanced biofilm formation in the presence of glucose and sub-MIC of ciprofloxacin and it was found that the slime layer prodn. increases in the presence of glucose and low concn. of ciprofloxacin. [on SciFinder(R)]

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