Dr. J.I. Gregor

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Potentially toxic organic compounds, acids, metals and radionuclides in the northern polar region are a matter of concern as it becomes evident that long-range transport of pollution on hemispheric to global scales is damaging this part of the world. In this review and assessment of sources, occurrence, history and pathways of these substances in the north,(More)
R E N E E L . F A L C O N E R , * , + T E R R Y F . B I D L E M A N , t D E N N I S J . G R E G O R , $ R A Y S E M K I N , § A N D C A M I L L A T E I X E I R A S Atmospheric Environment Service, Downsview, Ontario M3H 5T4, Canada, Waterloo Centre for Groundwater Research, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada, and National Water(More)
The environmental quality of the Rhone River (Switzerland-France) has been assessed with a geochemical survey of the pollutants bound to suspended sediments. Ten samples were collected between Lake Geneva and the Mediterranean Sea in Nobember 1989 by continuous flow centrifugation and analysed for grain size distribution, carbonate, organic C, N, forms of(More)
Paired air and water samples were collected at Resolute Bay (74 degrees N, 95 degrees W) in summer 1992 to estimate the direction of gas exchange of hexachlorocyclohexanes (HCHs) and investigate possible loss processes in the water column. Average concentrations of alpha-HCH and gamma-HCH in ocean surface water were 4.7 +/- 0.9 and 0.44 +/- 0.11 ng/l,(More)
The Northwest Territories section of the Slave River is the recipient of chemical compounds from a variety of sources, including upstream industry and agriculture. In 1990, concerned government agencies formulated a practical, focussed, and comprehensive environmental monitoring program to assess contamination in the river and the Slave River Environmental(More)
Biological impact assessment of sediment-bound contaminants is currently considered essential in addition to routine chemical characterization. Conventional methods of sediment bioassessment require relatively large quantities of the sample. When sample sizes are limited however, these methods become ineffective. To overcome this problem, the Limited Sample(More)
Recent studies of contaminants under the Canadian Northern Contaminants Program (NCP) have substantially enhanced our understanding of the pathways by which contaminants enter Canada's Arctic and move through terrestrial and marine ecosystems there. Building on a previous review (Barrie et al., Arctic contaminants: sources, occurrence and pathways. Sci(More)
Lake Diefenbaker, on the South Saskatchewan River, Saskatchewan, Canada, receives, on average, 90% of its inflow from snowmelt and rainfall in the Rocky Mountains. The inflowing rivers also receive irrigation return flows and municipal and industrial effluents which may result in the contamination of lake sediments. The sediments were assessed by nematode(More)
It is becoming increasingly evident that long-range transported pollutants can have a devastating effect on the fragile ecosystems of the Canadian Arctic region (Muir et al., 1992; Thomas et al., 1992). The phenomenon of Arctic haze which prevails during the late winter-early spring period results in the flux of elevated quantities of toxic pollutants to(More)
Bei der „Fast-track-Rehabilitation“ handelt es sich um ein strukturiertes multimodales perioperatives Behandlungskonzept zur Beschleunigung der postoperativen Rekonvaleszenz, dessen Erfolg bereits in der Viszeralchirurgie nachgewiesen werden konnte. Allerdings existieren bislang kaum Daten aus der Thoraxchirurgie und die Relevanz dieses Konzeptes bei(More)
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