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14. Effects of organic nutrients and growth factors on biostimulation of tributyltin removal by sediment microorganisms and Enterobacter cloacae

Author

Sakultantimetha, Arthit Keenan, Helen E. Beattie, Tara K. and Bangkedphol, Sornnarin Cavoura, Olga

Abstract

Natural attenuation can reduce contamination of tributyltin (TBT), but persistence of the xenobiotic can cause long-term issues in the environment. Biostimulation is used to accelerate biodegradation. This study investigated the ability of individual organic nutrients and growth factors to enhance TBT biodegradation by sediment microorganisms (SED) and Enterobacter cloacae strain TISTR1971 (B3). The supplements that produced high biomass yield were selected for degradation enhancement. For TBT degradation at initial concentration of 0.1 mg/l, negative or limited degradation was observed in some selected supplements indicating that increasing the biomass did not necessarily promote degradation. Consequently, the addition of nutrients was expected to increase both dioxygenase activity and the degrader population. At different concentrations of supplements, a mixture of succinate/glycerol showed the highest removal for SED which reduced TBT by 77%, 75%, and 68% for 0.1x, 1x, and 10x supplement concentration, respectively. For B3, the addition of succinate showed degradation of 49% (0.1x), 75% (1x), and 77% (10x). Most nutrients and amino acids had an inhibitory effect at 1x or 10x levels. Excess amount of the nutrients added can inhibit the initial degradation of TBT. Therefore, TBT biostimulation requires supplements that increase the capability of TBT degraders at an appropriate amount.

Published
2011

24. Acanthamoeba returns: good news or bad?

Author

Beattie, Tara K, Tomlinson, Alan, and Seal, David V

Subjects
*CONTACT lenses, *ACANTHAMOEBA, *BIGUANIDE, *PEROXIDES, *CLEANING
Abstract

Deals with the efficacy of contact lens (CL) solutions against Acanthamoeba. Resistance of Acanthamoeba to polyhexamethylene biguanide; Suggested percentage of peroxide solutions; Comparison between the use of multi-purpose solutions and one-step peroxide solutions; Tips on cleaning CL cases.

Published
2002

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