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Arsenic biotransformations in terrestrial organisms: A study of the transport and transformation of arsenic in plants, fungi, fur and feathers, using conventional speciation analysis and X-ray absorption spectroscopy
(2007-07-05)
Arsenic taken up by plants and fungi from contaminated soils can subsequently be introduced into food chains. Given the toxic properties of some arsenic compounds, this may be a cause for concern. Much remains to be learned ...
Effect of nutritional status on phenotypic characteristics of Arabidopsis and alfalfa in relation to the expression of AtSnRK2.9
(2007-10-01)
The mechanisms of plant response to nutrient limitation and utilisation are of great interest for agricultural purposes. Phosphate is a non-renewable resource and is one of the most important nutrients required for plant ...
Responses of zooplankton community structure and ecosystem function to the invasion of an invertebrate predator, Bythotrephes longimanus
(2007-07-20)
Freshwater ecosystems face unprecedented levels of human-induced stresses and it is expected that the invasion of non-indigenous species will cause the greatest loss of biodiversity in lakes and rivers worldwide. Bythotrephes ...
Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic
(2007-09-19)
The biological remains preserved in the sediments of Arctic lakes and ponds in the Canadian High Arctic are important indicators of environmental change, especially as long-term instrumental data are often lacking. Although ...
The evolution of species' geographical range limits: an empirical test using two coastal dune plants, Camissonia cheiranthifolia (Onagraceae) and Abronia umbellata (Nyctaginaceae)
(2007-07-05)
Every species has a limit to its geographic distribution. The problem is that we don’t really know why. Classical explanations propose that range limits occur where the ecological conditions overwhelm adaptation and ...
Targeted over-expression of hsp22 and the maintenance of locomotor activity of third instar larvae of Drosophila melanogaster at high temperatures
(2007-10-02)
Hsp22 has been implicated in stress tolerance and longevity in various organisms though its role in Drosophila melanogaster larval thermal tolerance has not yet been investigated. I undertook this project to determine if ...
Probing Immune Function During Aging in Adult Drosophila
(2007-10-10)
Virtually all multicellular organisms rely on a highly conserved innate immune system for defense against foreign microorganisms. Innate immunity consists primarily of a humeral response that culminates in the expression ...
Isolation and Characterization of Plastidic Glucose-6-Phosphate Dehydrogenase (G6PDH) from Castor (Ricinus communis L.)
(2007-09-27)
Abstract
Plant cells contain plastids, organelles dedicated to performing specific biochemical processes including photosynthesis, starch and oil biosynthesis. Fatty acid biosynthesis in oil seeds occurs in one type ...
Determining the distribution and fate of mercury in sediments of the Cataraqui River at Kingston, Ontario
(2007-11-02)
The Cataraqui River, which drains 930 square km of watershed before emptying into the inner harbour of Kingston, Ontario (pop: 113,000), has a long history of anthropogenic use. More than 40 industries have existed within ...
Allometric Scaling in Centrarchid Fish: Origins of Intra- and Inter-specific Variation in Oxidative and Glycolytic Enzyme Levels in Muscle
(2007-11-01)
The influence of body size on metabolic rate, muscle enzyme activities, and the underlying patterns of mRNA for these enzymes were explored in an effort to explain the genetic basis of allometric variation in metabolic ...