Abstract

LOPEZ, Sofía; ZEA, Sven  and  GOMEZ-LEON, Javier. Evaluation in vitro of biofilm formation with marine bacteria from Colombian Caribbean. Bol. Invest. Mar. Cost. [online]. 2019, vol.48, n.2, pp.71-93.  Epub Dec 11, 2019. ISSN 0122-9761.  https://doi.org/10.25268/bimc.invemar.2019.48.2.767.

Biofilm formation is an important process for marine bacterial communities because this mechanism favors adaptation to variations in environmental conditions. The objective of this study was to evaluate the biofilm formation of bacteria isolated from marine sediments under in vitro conditions. For this, biofilm quantification assays were performed using two methods, violet crystal and reduction of the XTT dye; In addition, the viability of the bacteria was evaluated by Live / Dead staining. Subsequently, the strains evaluated were identified using the 16S RNA marker. The results showed that the isolates belong to the genus Bacillus, all in different ranges were able to form films and strains B. safensis 64181 and Bacillus sp 64186 were selected which indicated greater production of this. Tests at different temperatures showed that for the strains selected the best temperature was 28 ° C. In addition, a mixed culture was carried out with these isolates, resulting in differences in the density of the biofilm and less changes in its metabolic activity in temperature variation experiments. From the results we can infer that bacterial consortiums can favor resistance to environmental variations in biofilms formed by bacteria of the genus Bacillus.

Keywords : Marine Bacteria; Bacillus; Biofilms; Sediments.

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