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Biodegradation of naphthalene mediated by the plant growth promoting rhizobacteria
Summary
Researchers compared two strains of Paenibacillus polymyxa bacteria for their ability to break down naphthalene — a toxic aromatic hydrocarbon found in petroleum products and plastic additives — in both liquid and soil settings. One strain was significantly more effective. Identifying effective bacteria for breaking down plastic-associated pollutants is relevant to bioremediation of contaminated environments.
Abstract We compared the ability of two bacterial strains, Paenibacillus polymyxa A26 and P . polymyxa A26Sfp, for biodegradation of naphthalene (NAP). The studies were performed under simulated laboratory conditions, in liquid medium and soil with different carbon sources, pH and salt contents. Changes in the luminescence inhibition of Aliivibrio fischeri , as an indicator of the baseline toxicity, were observed in degradation mixtures during 7 days of incubation. While both strains expressed the best growth and NAP degradation ability in the minimal salt medium containing sucrose and 5% NaCl at pH 8, the mutant strain remained effective even under extreme conditions. A26Sfp was found to be an efficient and potentially industrially important polycyclic aromatic hydrocarbon degradation strain. Its extracellular polysaccharide production is 30% and glucan production twice that of the wild type A 26. The surface tension reduction ability was ascertained as 25–30% increased emulsification ability.
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