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Emerging insects were monitored every 10 days between early May and late August 1993, from tidal pools in three coastal salt marshes on Prince Edward Island, Canada. The salt marsh pools ranged from about 1 m(2) to > 1,000 m(2) in surface area, and had salinities ranging from 11-27parts per thous...
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In the spadix of Caladium, there is a clearly recognizable intermediate zone consisting of sterile male flowers. The transition between the female zone and the male sterile zone is more or less abrupt. During the early stages of development of the inflorescence, a few atypical bisexual flowers betwe...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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....
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The leaves initiated at successive nodes in the heteroblastic series in Leea guineensis seedlings become progressively more complex in construction. Leaves at the first four nodes are simple and are followed by transitional forms between nodes 5 and 7. These transitional leaf forms are compound in n...