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"This paper examines design alternatives for emissions trading credits and assesses their relative performance given several sources of uncertainty endemic to market-based environmental regulatory programs. Facilities regulated in such programs face significant uncertainty about their total emissions. Uncertainty arises due to changes in production-demand schedules for their product, imperfect knowledge of abatement efficiency, and other informational lags. Depending on the design of the trading credit, this uncertainty can result in significant market price volatility and undesirable increases in peak emissions (in the absence of additional costly market institutions, such as contingent contracts and brokered insurance). In addition to the design alternatives, the paper considers allocation alternatives to alleviate these unintended effects and also discusses the value of properly designed reconciliation markets". Copyright 1994 Western Economic Association International.

Two enteric pathogens, Campylobacter jejuni and Yersinia enterocolitica serogroup O:3, together with Escherichia coli, were investigated for susceptibility to UV radiation at 254 nm. The UV dose required for a 3-log reduction (99.9% inactivation) of C. jejuni, Y. enterocolitica, and E. coli was 1.8, 2.7, and 5.0 mWs/cm2, respectively. Using E. coli as the basis for comparison, it appears that C. jejuni and Y. enterocolitica serogroup O:3 are more sensitive to UV than many of the pathogens associated with waterborne disease outbreaks and can be easily inactivated in most commercially available UV reactors. No association was found between the sensitivity of Y. enterocolitica to UV and the presence of a 40- to 50-megadalton virulence plasmid.