Influence of Aroclor 1242 concentration on polychlorinated biphenyl biotransformations in Hudson river test tube microcosms

Article Abstract:

Test tube microcosms of upper Hudson river sediment shows reductive dechlorination and aerobic biodegradation of polychlorinated biphenyls (PCBs). At Aroclor 1242, a PCB, concentration of 37.3 micro moles per kg the biodegradation occurs at slow and constant rate; and at concentrations from 93.3 to 933 micro moles per kg, biodegradation is accelerated after four to eight weeks of acclimation period. Biodegradation is enhanced temporarily by nutrients and agitation which indicates that natural restoration is more effective than short term stimulation with nutrients.

Environmental aspects, Polychlorinated biphenyls, Water, Aquatic microbiology, Marine bacteria, Hudson River

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Influence of nonionic surfactants on bioavailability and biodegradation of polycyclic aromatic hydrocarbons

Article Abstract:

Nonionic surfactants increase the solubility of polycyclic aromatic hydrocarbons (PAHs) which makes the biodegradation of PAHs by microorganisms faster. The surfactants decrease the interfacial tension between the solid and aqueous phase, increase solubility and the formation of the aqueous phase of PAHs. These surfactants are effective only if their concentration is more than the critical micelle concentration but high concentrations of the surfactants might be toxic to the microorganisms.

Research, Surface active agents

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Biodegradation of aliphatic-aromatic copolyesters by Thermomonospora fusca and other thermophilic compost isolates

Article Abstract:

The aliphatic-aromatic copolyesters generated from butanediol, adipic acid and terephthalic acid are metabolized by mixed cultures. Twenty strains isolated from compost have been shown to exhibit significant activity against these copolyesters. The most effective in degrading these copolyesters are two strains belonging to the actinomycete species Thermomonospora fusca.

Polymers, Hydrocarbons, Aromatic compounds

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