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Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar-contaminated surface sediments


, : Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar-contaminated surface sediments. Environmental Toxicology & Chemistry 15(11): 1876-1882

Naphthalene has been transported approx. 400 m via groundwater flow from buried subsurface coal tar to an organic matter-rich seep area where the water emerges at the foot of a hill in a field study site. We have tested several hypotheses for explaining why naphthalene persists in seep sediments. In aerobic laboratory flask assays, conversion of 14C-naphthalene to 14CO-2 occurred and was not stimulated by amendments with vitamins or inorganic nutrients. Thus, neither toxicity nor nutrient limitation were the cause of naphthalene persistence. At the site, in situ sediment oxygen concentrations were below detection. Oxygen-limited naphthalene biodegradation was demonstrated both by measuring no conversion of 14C-naphthalene to 14CO-2 in samples of seep sediments prepared anaerobically and by measuring naphthalene loss from anaerobic nitrate-amended slurry-phase incubations of the sediment only after O-2 was added. However, when H-2O-2 was added as an O-2 source to site sediments in situ in a randomized block design, no discernible naphthalene loss occurred. The possibility that decreased bioavailability might contribute to naphthalene persistence was investigated by monitoring 14CO-2 evolved by microorganisms added to gamma-ray sterilized sediments that had been exposed under aseptic conditions to 14C-labeled naphthalene for periods ranging from 0 to 28 d. Resulting patterns in the extent and rate of naphthalene mineralization revealed an inverse relationship to the duration of contact with the sediment, but only when the mixed microbial inoculum had been enriched on aqueous-phase naphthalene. We conclude that oxygen limitation is the most probable cause for lack of naphthalene biodegradation at our field study site. However, diffusion or sorption reactions may also play a role.

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Accession: 002914192

DOI: 10.1002/etc.5620151104

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Pierrot-Deseilligny, E., 1996: Transmission of the cortical command for human voluntary movement through cervical propriospinal premotoneurons. In man there is now strong evidence for the existence of a system of cervical propriospinal premotoneurons interposed in the corticospinal pathway to upper limb motoneurons. The relevant neurons are located rostral to upper limb motoneurons. They...

Clifford, L.; Singh, A.; Wilson, G.A.; Toy, P.; Gajic, O.; Malinchoc, M.; Herasevich, V.; Pathak, J.; Kor, D.J., 2013: Electronic health record surveillance algorithms facilitate the detection of transfusion-related pulmonary complications. Transfusion-related acute lung injury (TRALI) and transfusion-associated circulatory overload (TACO) are leading causes of transfusion-related mortality. Notably, poor syndrome recognition and underreporting likely result in an underestimate of th...

Payne, R.J.H.; Nowak, M.A.; Blumberg, B.S., 1992: Analysis of a cellular model to account for the natural history of infection by the hepatitis B virus and its role in the development of primary hepatocellular carcinoma. Infection with the hepatitis B virus (HBV) can have many different outcomes. Transient infection may result in acute hepatitis or may remain subclinical. Persistent infection may also be subclinical, or may involve chronic active hepatitis, and ca...

Ogembo, J.G.; Kannan, L.; Ghiran, I.; Nicholson-Weller, A.; Finberg, R.W.; Tsokos, G.C.; Fingeroth, J.D., 2013: Human complement receptor type 1/CD35 is an Epstein-Barr Virus receptor. Epstein-Barr virus (EBV) attachment to primary B cells initiates virus entry. Although CD21 is the only known receptor for EBVgp350/220, a recent report documents EBV-infected B cells from a patient genetically deficient in CD2On normal resting B...

Janairo, J.Isagani.B.; Sakaguchi, T.; Hara, K.; Fukuoka, A.; Sakaguchi, K., 2015: Effects of biomineralization peptide topology on the structure and catalytic activity of Pd nanomaterials. Highly branched, coral-like Pd nanostructures were formed using a biomineralization peptide conjugated to an oligomeric peptide that simultaneously controls the spatial orientation, arrangement and valency. The Pd nanocoral showed very high cataly...

Barbano, D.M.; Lynch, J.M.; Bauman, D.E.; Hartnell, G.F.; Hintz, R.L.; Nemeth, M.A., 1992: Effect of a prolonged-release formation of N-methionyl bovine somatotropin (sometribove) on milk composition. Forty Holstein cows received bi-weekly injections of prolonged-release formulation of bST, and 39 received bi-weekly injections of excipient, in a study to evaluate the effects of long-term bST administration on milk composition and component prod...

van Os, R.; Dawes, D.; Mislow, J.M.; Witsell, A.; Mauch, P.M., 1997: Host conditioning with 5-fluorouracil and kit-ligand to provide for long-term bone marrow engraftment. Administration of kit-ligand (KL) before and after doses of 5-fluorouracil (5-FU) results in marrow failure in mice, presumably because of enhanced KL-induced cycling of stem cells, which makes them more susceptible to the effects of 5-FU. In atte...

Yamashita, H.; Oesterle, E.C., 1995: Induction of cell proliferation in mammalian inner-ear sensory epithelia by transforming growth factor alpha and epidermal growth factor. Regenerative proliferation occurs in the inner-ear sensory epithelia of warm-blooded vertebrates after insult. To determine how this proliferation is controlled in the mature mammalian inner ear, several growth factors were tested for effects on p...

Edmonds C.N.; Green C.P.; Higginbottom I.E., 1990: Review of underground mines in the English Chalk; form, origin, distribution and engineering significance. Pages 511-519 1990

Khan, G.M.; Hudge, V.S.; Salunke, M.R., 1981: A simple correlation coefficients between yield and yield attributing characters in wheat. Simple correlation coeff. between grain yield and yield characteristics were determined for 2 tall wheat cv. Ajantha and NI 5439, 2 semi-dwarf cv. Kalyan Sona and Sonolika and 2 dwarf cv. HD 4502 and Moti grown in 1980-1. There was a significant p...