BACTERIAS DEGRADADORAS DE PETROLEO PDF

BACTERIAS DEGRADADORAS DE HIDROCARBUROS AISLADAS EN SUELOS CONTAMINADOS DE PETROLEO Aislar cepas bacterianas y. Aislamiento de bacterias potencialmente degradadoras de petróleo en hábitats de ecosistemas costeros en la Bahía de Cartagena, Colombia. Download Citation on ResearchGate | SELECCIÓN DE BACTERIAS CON CAPACIDAD DEGRADADORA DE HIDROCARBUROS Estudio y selección de bacterias aerobias degradadoras de hidrocarburos del petróleo aisladas de costas.

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Taxonomic and metabolic variety notwithstanding, individual species seldom have the complete enzymatic toolset required to completely degrade the main organic compounds contaminating the ecosystem at any given time, and thus biodegradation usually proceeds through the concerted action of mixed populations or microbial consortia.

Several authors have pointed out that short chain aliphatic hydrocarbons usually volatilize during the first hours after a spill. Anaerobic microorganisms, however, are less versatile regarding their growth substrate and often display increased sensitivity toward heavy metals, hence playing a smaller role in biodegradation [2].

Pure stocks were obtained from colonies isolated by streaking, verifying their homogeneity by Gram staining and through the examination of culture characteristics. Effects of heavy fuel oil on the bacterial community structure of a pristine devradadoras mat.

However, direct experimental observation has revealed that low molecular weight aromatic compounds may start to be degraded much earlier, sooner, in fact, than many aliphatic molecules [51].

Lastly, the genera Kurthia and Azotobacter were represented each by a single strain.

Had hydrocarbon composition been determined at that point, we would have most likely found practically identical levels of asphaltenes and resins in crudes treated with the strains under examination and in their controls, significantly decreased levels of saturated hydrocarbons in the former, and only a small drop in the concentration of aromatic hydrocarbons, since the bulk of their degradation takes place after 21 days. Figure 3 shows the chromatographic profile of the saturated hydrocarbon fraction, in a signal intensity pico-amperes versus time chart for strains F9S, F10S1 and F1FLC.

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Comparative study of five polycyclic aromatic hydrocarbon degrading bacterial strains isolated from contaminated soils. Five strains belonging to the latter group could not be identified with the biochemical tests employed in this study.

BACTERIAS DEGRADADORAS DE HIDROCARBUROS by Mirelly Katherine Diaz Gamarra on Prezi

These microorganisms can be found not only in soil and water samples, but in clinical specimens, occasionally. Representatives of the Marinomonas genus were isolated for the first time from sediments contaminated with polycyclic aromatic hydrocarbons in [42]. F10S1 and Bacillus sp. Naphthalene petgoleo and incorporation of naphthalene-derived carbon into biomass by the thermophile Bacillus thermoleovorans.

Morphological descriptions were based on dsgradadoras shape, motility and pigmentation. The latter, in turn, are more susceptible to biodegradation than resins and asphaltenes [47, 48]. Aliphatic hydrocarbons decreased in comparison with those of the abiotic control regarding the non-resolved background cycloalkanes, resins and asphaltenes.

Some species of this genus have been isolated from marine environments contaminated with hydrocarbons [5, 17, 28].

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Taxonomy of aerobic marine eubacteria. No statistically significant differences were found for this parameter among the examined strains, although the increased proportion of carboxyl and hydroxyl groups demonstrates the presence of biological oxidation processes. Biochemical characterization of the strains comprised tests for the fermentation of glucose, lactose, sucrose and mannitol, as well as for the production of indole, gas and hydrogen bavterias.

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Effects of rhamnolipid biosurfactants on removal of phenanthrene from soil. However, and despite the higher propensity of n-alkanes for oxidation [35, 49], bqcterias differences in biodegradation percentages were detected between saturated hydrocarbons, asphaltenes and monocyclic aromatic hydrocarbons after 45 days.

Most research on bioremediation technology has focused therefore on aerobic heterotrophic bacteria, due not only to the taxonomic diversity of hydrocarbon-degrading representatives from this group, but to bacteriae ability to use xenobiotic compounds as carbon source in pure cultures [3]. This probably explains the high number of hydrocarbon-degrading microorganisms identified through isolation protocols A and B, which totaled 33 strains.

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Received in October, Biodegradability of Venezuela crude oils. Biodegradation of crude oil contaminating marine shorelines and freshwater wetlands. Two of the isolated strains belonged to the Pseudomonas genus. Since their physico-chemical properties make them toxic compounds for the growth of most bacteria [44, 50], it is assumed that the degradation of aromatic compounds does not start until saturated hydrocarbons have been used up.

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Appl Environ Microbiol ;64 The cultures were discarded after 15 days. Universidad de Oriente; These authors attributed such a phenomenon to adaptations of these microorganisms to the chronic contamination of their original habitats.

Microbial diversity in a hydrocarbon- and chlorinated-solvent-contaminated aquifer undergoing intrinsic bioremediation.