Do marine bacteria degrade .alpha.-hexachlorocyclohexane stereoselectively?

Abstract

Acknowledgment in Memorium. This paper is dedicated to Ernie Hughes, who pioneered the scientific development of the NIST gas SRM program, and who contributed so much of his technical knowledge to numerous interactions with experts in the gas analysis field, worldwide. In the present study, Ernie carried out the analyses of the NPL standards and supplied the SRMs that were analyzed by NPL, but passed away before this paper could be written. His unique insight into the requirements for accuracy in gas standards and trace gas analysis will be sorely missed by his many friends and scientific colleagues both in the United States and abroad.Registry No. CO, C02, Literature Cited(1) Davenport, A. J.; Freshwater, F.; King, J. H.; Merrifield, D. R.; Partridge, R. H.; Woods, P. T. NPL Quantum Metrology Report: Analyses of Reference Gas Mixtures for the Community Bureau of Reference, Commission of European Communities; January 1985.

The international polar year (IPY) circumpolar flaw lead (CFL) system study: The importance of brine processes for α‐ and γ‐hexachlorocyclohexane (HCH) accumulation or rejection in sea ice

“…Although these enantiomers exhibit identical basic physical and chemical properties they behave differently when degraded by microbes because enzymes exhibit stereoselectivity (Müller and Kohler, 2004). Accordingly, the racemic (1:1) mixture of α-HCH released into the environment undergoes enantioenrichment when enantioselective processes are considered (microbial breakdown, selective biological uptake, biotransformation and elimination pathways in food webs (Faller et al, 1991;Falconer et al, 1995;Wiberg et al, 2000)). On the other hand, abiotic transformations such as transport, hydrolysis or photolysis are not enantioselective.…”

Chiral analysis of pollutants and their metabolites by capillary electromigration methods

“…These 19 compounds, due to the existence of axial chirality, are called atropisomers (they are given in Table 2). Most of these compounds are introduced in the environment as racemates, but atropisomers have shown different toxicities and metabolic pathways [64]. Although, GC (with ECD or MS detection) has been the most frequently used technique to analyze PCBs congeners and enantiomers, CE has also proven to be effective in this field.…”

Plant and soil enantioselective biodegradation of racemic phenoxyalkanoic herbicides

“…In other work, Faller et al 21,22 reported that the (−) enantiomer of ␣-1,2,3,4,5,6-hexachlorocyclohexane (␣-HCH) was more prevalent off of the east British coast, whereas (+) ␣-HCH was more prevalent in the central North Sea. In another example, Garrison et al 23 reported the preferential degradation of S-(−) 2,4-DP in soil, while Ludwig et al 24 reported the preferential degradation of R-(+) 2,4-DP by marine microorganisms.…”