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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 11, No. 1, 2008
Bioline Code: ej08006
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 11, No. 1, 2008

 en Inhibition of attachment of some fouling diatoms and settlement of Ulva lactuca check for this species in other resources zoospores by film-forming bacterium and their extracellular products isolated from biofouled substrata in Northern Chile
Silva-Aciares, Fernando & Riquelme, Carlos

Abstract

The biofouling of surfaces submerged in the marine environment includes primary colonization of the substrate by microorganisms including bacteria, microalgae, and microscopic reproductive propagules of macroorganisms such as algal zoospores. The present study reports the evaluation of the inhibitory potential of biofilms and extracellular products (EP) of the indigenous bacterium Alteromonas check for this species in other resources sp strain Ni1-LEM on the settlement of marine biofouling such as: (i) eight marine benthic diatoms and (ii) zoospores of the alga Ulva lactuca check for this species in other resources , as well as the germination of these zoospores and was compared with reference strains with proven antifouling properties, Halomonas marina check for this species in other resources (ATCC 25374) and Pseudoalteromonas tunicata check for this species in other resources . Highest antifouling activity was found for the indigenous strain. In attempts to better define the chemical nature of the antifouling substance in the EP of the Alteromonas sp strain Ni1-LEM, the culture filtrates were tested for activity after heat treatment, enzymatic treatments, dialysis through semipermeable membranes, and separation into polar (aqueous) and non-polar (organic) fractions. The results suggested that the antifouling substance in the culture filtrates to be protein or peptide in nature, thermostable, hydrophilic, and equal to or greater than 3500 daltons in molecular size. Antifouling substances from bacteria may lead to the development of novel antifouling agents in the future.

Keywords
Alteromonas sp, antifouling bacteria, antifouling compounds, diatoms, marine microfouling, Ulva zoospores.

 
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