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Heavy metals effect on the E. coli biofilms isolated from the polluted waters of Arieş river (Romania)

Author(s): Andreea Bodoczi-Florea

Journal: Extreme Life, Biospeology & Astrobiology
ISSN 2066-7671

Volume: 4;
Issue: 2;
Start page: 41;
Date: 2012;
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Keywords: biofilms | heavy metals | E. coli | epifluorescence microscopy

Objective: Biofilms are surface-attached microbial communities consisted by multiple layers ofcells embedded in a hydrated matrix. Biofilms are dynamic microbial communities in which transitionsbetween planktonic and sessile modes of growth occur interchangeably in response to differentenvironmental cues. The effects of three trace metals (copper, manganese and zinc) at differentconcentrations on Escherichia coli strains isolated from the water of Arieş river (Romania) werecompared using epifluorescence microscopy. Data showed that the heavy metals affected not only thecells viability but also the biofilm formation according to the growing concentration of the metals in themedia.
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