Results

101 - 125 of 634
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
High levels of azinphos-methyl (0.4–0.8 μg/L) were detected in the Wilmot River, Prince Edward Island, Canada, following runoff from an agricultural field after a heavy rainfall on 19 July 2002. Benthic macroinvertebrate abundance and diversity were sharply lower in samples collected 1 d after th...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Impairment of immune function in aquatic animals has been proposed as a possible consequence of low-level contamination of surface waters with anthropogenic substances such as through the discharge of wastewater into rivers, lakes, and oceans. The study at hand investigated the effects of chronic (3...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The present study examined the effects of neonatal exposure to serial low dose injections of the glutamate agonist, domoic acid (DOM), on learning and memory in two spatial memory tasks in the rat. Neonatal Sprague Dawley rats were given single daily injections of low dose DOM (20 microg/kg) over po...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The matrix metalloproteinases (MMPs) are thought to play key roles in tumour formation and malignant progression. The present study demonstrates alterations in the regulation of matrix metalloproteinase-2 (MMP-2) expression in response to the phorbol ester tumour promoter, PMA, in a H-ras transforme...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Given the logistical difficulties, cost, and time involved in species-level identifications, several authors have proposed the use of coarser taxonomic resolution (e.g. family, order) in studies of pollution. The use of surrogates instead of species relies on their sufficiency to detect community re...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The overproduction of reactive oxygen species (ROS) and reactive nitrogen species (RNS) is a common underlying mechanism of many neuropathologies, as they have been shown to damage various cellular components, including proteins, lipids and DNA. Free radicals, especially superoxide (O(2)*-), and non...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A comparative developmental study of the compound leaves Ailanthus altissima, Lupinus polyphyllus, Fraxinus americana, Rhus typhina and the highly dissected leaves of Achillea millefolium, was initiated to document the changes in form that lateral elements (leaflets/lobes) undergo at later stages in...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Egg development was investigated for Hexagenia limbata (Serville) from Southern Indian Lake (SIL) in northern Manitoba, Canada. The SIL population is located near the northern range limit of H. limbata, and some important differences in hatching dynamics were seen in comparison with southern populat...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
An expression vector was constructed in which TGF-beta-1 was placed under the control of the metallothionein promoter. Cys223 and Cys225 in the TGF-beta-1 propeptide were converted to serines, mutations which result in dissociation of the pro-peptide and secretion of bioactive TGF-beta-1 [Brunner,A....
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
A method of collecting postparasitic Neomesomermis flumenalis from larval Prosimulium mixtum/fuscum and Simulium venustum is described. The larval blackflies were collected by sweeping them with paint brushes from rocks into buckets of stream water. The larvae were obtained free of debris by placing...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Two bacterial symbionts of entomopathogenic nematodes, one of which originated from Texas, U.S.A., and the other from Newfoundland, Canada, were characterized phenotypically. These strains belonged to the genus Xenorhabdus. The Newfoundland (NF) strain was shown to be X. bovienii but the Texas (TX) ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
1. Data from 364 mammal and 564 bird species were used to compare these two taxa in the patterns of variation in population density and energy use as a function of body mass. 2. This study demonstrates previously unappreciated quantitative differences between mammals and birds. Over a wide range of ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Developing new therapeutants for stroke requires animal models in which typical stroke outcomes can be detected. In rats, temporary occlusion of the middle cerebral artery (MCAo) closely resembles reversible human ischemic stroke, but most neuroprotection studies have used limited, short-term (1-2 w...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Analysis of haemolymph samples from field-collected larvae of Simulium venustum Say, S. vittatum Zett. and either Prosimulium mixtum Syme & Davies or P. fuscum Syme & Davies or a mixture of the two showed the haemolymph of all species to be essentially similar with respect to amino-acid pool...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Two sandy beaches were studied in south - central Chile (ca., 39 degrees S), during 17 months to analyze the seasonal variability in population abundances and zonation of the most common species of the intertidal macroinfauna. The beaches displayed differences in mean grain size, Dean's parameter (a...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Rev. of the book Climate Change and Forests: Emerging Policy and Market Opportunities by C. Streck, R. O'Sullivan, T. Janson-Smith and R.Tarasofsky