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1.
Environ Pollut ; 317: 120772, 2023 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-36455775

RESUMEN

Petroleum hydrocarbons and heavy metals are some of the most widespread contaminants affecting marine ecosystems, urgently needing effective and sustainable remediation solutions. Microbial-based bioremediation is gaining increasing interest as an effective, economically and environmentally sustainable strategy. Here, we hypothesized that the heavily polluted coastal area facing the Sarno River mouth, which discharges >3 tons of polycyclic aromatic hydrocarbons (PAHs) and ∼15 tons of heavy metals (HMs) into the sea annually, hosts unique microbiomes including marine bacteria useful for PAHs and HMs bioremediation. We thus enriched the microbiome of marine sediments, contextually selecting for HM-resistant bacteria. The enriched mixed bacterial culture was subjected to whole-DNA sequencing, metagenome-assembled-genomes (MAGs) annotation, and further sub-culturing to obtain the major bacterial species as pure strains. We obtained two novel isolates corresponding to the two most abundant MAGs (Alcanivorax xenomutans strain-SRM1 and Halomonas alkaliantarctica strain-SRM2), and tested their ability to degrade PAHs and remove HMs. Both strains exhibited high PAHs degradation (60-100%) and HMs removal (21-100%) yield, and we described in detail >60 genes in their MAGs to unveil the possible genetic basis for such abilities. Most promising yields (∼100%) were obtained towards naphthalene, pyrene and lead. We propose these novel bacterial strains and related genetic repertoire to be further exploited for effective bioremediation of marine environments contaminated with both PAHs and HMs.


Asunto(s)
Metales Pesados , Microbiota , Petróleo , Hidrocarburos Policíclicos Aromáticos , Biodegradación Ambiental , Petróleo/análisis , Bacterias/genética , Bacterias/metabolismo , Metales Pesados/metabolismo , Hidrocarburos Policíclicos Aromáticos/metabolismo , Hidrocarburos/metabolismo , Sedimentos Geológicos/microbiología
2.
Microb Biotechnol ; 12(2): 334-345, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30277309

RESUMEN

The disposal of reject brine, a highly concentrated waste by-product generated by various industrial processes, represents a major economic and environmental challenge. The common practice in dealing with the large amounts of brine generated is to dispose of it in a pond and allow it to evaporate. The rate of evaporation is therefore a key factor in the effectiveness of the management of these ponds. The addition of various dyes has previously been used as a method to increase the evaporation rate. In this study, a biological approach, using pigmented halophilic bacteria (as opposed to chemical dyes), was assessed. Two bacteria, an Arthrobacter sp. and a Planococcus sp. were selected due to their ability to increase the evaporation of synthetic brine. When using industrial brine, supplementation of the brine with an iron source was required to maintain the pigment production. Under these conditions, the Planococcus sp. CP5-4 produced a carotenoid-like pigment, which resulted in a 20% increase in the evaporation rate of the brine. Thus, the pigment production capability of halophilic bacteria could potentially be exploited as an effective step in the management of industrial reject brines, analogous to the crystallizer ponds used to mine salt from sea water.


Asunto(s)
Arthrobacter/metabolismo , Pigmentos Biológicos/metabolismo , Planococcus (Bacteria)/metabolismo , Sales (Química)/metabolismo , Eliminación de Residuos Líquidos/métodos , Biotecnología/métodos , Hierro/metabolismo , Purificación del Agua/métodos
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