Search

The potential of compound-specific isotope analysis to assess in situ biodegradation of methyl tert-butyl ether (MTBE) in groundwater is examined in laboratory studies at the University of Waterloo, Waterloo, Ontario, Canada. The research suggests that carbon isotope analysis could possibly be used to trace in situ biodegradation of MTBE and tert-butyl ether.

Researchers from the University of Waterloo, Ontario, used solid-phase microextraction to examine the concentration levels of the adsorption of very hydrophobic organic compounds onto poly(dimethylsiloxane) fiber coatings and dissolved humic organic matter.

Researchers from the University of Waterloo conducted several electrochemical experiments to simulate the reduction of n-nitrosodimethylamine by granular iron.

Researchers from the University of Waterloo, Ontario, conducted batch and batch tests to study the reduction pathways and kinetics of n-nitrosodimethylamine using both granular and nickel-enhanced iron.

Researchers from the University of Waterloo, Canada evaluated the accuracy of carbon isotope ratio analysis for chlorinated methanes, ethanes, and ethenes in aqueous samples. Direct solid-phase microextraction (SPME), headspace SPME, and headspace equilibration were used to determine the ratios of carbon isotopes in chlorinated solvents.

Researchers from the Universities of Toronto and Waterloo, Canada evaluated the fractionation of carbon isotope during the dechlorination of trichloroethene, cis-dichloroethene, and vinyl chloride using a microbial culture and described the process using a Rayleigh type model.

Concepts from the theory of sequence comparison are adapted to measure the overall similarity or dissimilarity between two musical scores. A key element is the notion of consolidation and fragmentation, different both from the deletions and insertions familiar in sequence comparison, and from the compressions and expansions of time warping in automatic speech recognition. The measure of comparison is defined so as to detect similarities in melodic line despite gross differences in key, mode or tempo. A dynamic programming algorithm is presented for calculating the measure, and is programmed and applied to a set of variations on a theme by Mozart. Cluster analysis and spatial represeentation of the results confirm subjective impressions of the patterns of similarities among the variations. A generalization of the algorithm is presented for detecting locally similar portions in two scores, and is then applied.

The part that Canadian scientists played in designing a simple hand pump for the developing world is the subject of a recent Heritage Minute that has been seen by an […]