Browsing Biology by Issue Date
Now showing items 21-40 of 597
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Molecular characterization of potential geosmin-producing cyanobacteria from Lake Ontario
(University of Waterloo, 2006)Geosmin is an odorous secondary metabolite produced by some cyanobacteria during growth and released from the cells. Little is known about the biosynthesis of geosmin and the gene(s) required for its production have not ... -
Determining the relationships between forage use, climate and nutritional status of barren ground caribou, Rangifer tarandus groenlandicus, on Southampton Island, Nunavut, using stable isotopes analysis of d 13C and d 15N
(University of Waterloo, 2006)The caribou (Rangifer tarandus groenlandicus) on Southampton Island, Nunavut, Canada for the years 1998-2000 and 2004, 2005, were investigated using stable isotope analysis (SIA) of carbon (d 13C) and nitrogen (d 15N). ... -
A Functional Study of Major Histocompatibility Expression and Immune Function in Rainbow Trout, (Oncorhynchus mykiss)
(University of Waterloo, 2006)Major Histocompatibility Complex (MHC) receptors serve a critical role in self/non-self recognition through the presentation of peptide antigen to circulating T lymphocytes and are also believed to play a role in mate ... -
Molecular Phylogeography and Species Discrimination of Freshwater <em>Cladophora</em> (Cladophorales, Chlorophyta) in North America
(University of Waterloo, 2006)<em>Cladophora</em> is a widespread freshwater filamentous cholorophyte genus and is frequently observed in eutrophic waters where it can produce large nuisance blooms. These blooms can have direct impacts on water ... -
Determining food web impacts on experimental aquatic systems from the disposal of oil sands process-affected waste materials.
(University of Waterloo, 2006)Current mining operators in the Athabasca oil sands deposit of Alberta, Canada have made commitments to zero discharge of oil sands process-affected waste materials (OSPM) from the mine site and rehabilitation of mined ... -
Long- and Short-Term Dynamics of the Wetlands in the Amboseli Savanna Ecosystem, Kenya
(University of Waterloo, 2006)The wetlands of the semi-arid savanna ecosystem of Amboseli are the critical dry-season range for a diverse wildlife population, as well as for livestock and humans. Changes in the migratory patterns and increases in ... -
Obesity associated colon tumorigenesis: An assessment of tumor phenotype
(University of Waterloo, 2006)Colon cancer and obesity are two significant and related pathological states with multiple etiological factors. In this dissertation, it was hypothesized that tumor growth is accelerated in the altered state of obesity ... -
Heat Shock Response Inhibition and Gene Expression in <em>Xenopus Laevis</em> Cultured Cells
(University of Waterloo, 2006)Various genes have evolved to protect the cell against stressor-induced damage or death including the heat shock proteins (HSPs). Stressor-induced HSP gene expression involves the activation of heat shock factor (HSF), ... -
Characterization of the role of Orc6 in the cell cycle of the budding yeast <em>Saccharomyces cerevisiae</em>
(University of Waterloo, 2006)The heterohexameric origin recognition complex (ORC) acts as a scaffold for the G1 phase assembly of pre-replicative complexes. Only the Orc1-5 subunits are required for origin binding in budding yeast, yet Orc6 is an ... -
Characterization and expression patterns of five Winter Rye β-1,3-endoglucanases and their role in cold acclimation
(University of Waterloo, 2007-01-23)Winter rye produces ice-modifying antifreeze proteins upon cold treatment. Two of these antifreeze proteins are members of the large, highly conserved, β-1,3-endoglucanase family. This project was designed to identify ... -
Determining the subcellular localization of adenosine kinase and SAH hydrolase and their roles in adenosine metabolism
(University of Waterloo, 2007-01-23)Housekeeping enzymes are vital to the metabolism of all plant cells. Two such enzymes adenosine kinase (ADK) and S-adenosylhomocysteine (SAH) hydrolase share a similar function: both sustain S-adenosylmethionine-dependent ... -
Using Tetrahymena thermophila to study the role of protozoa in the inactivation of viruses in water
(University of Waterloo, 2007-04-24)Ciliated protozoa, such as Tetrahymena thermophila, are ubiquitous in the aquatic environment, including in sewage treatment plants. Their ability to graze on particulates could influence water quality in a number of ways, ... -
Hepatic Steatosis and TNF-α Signaling
(University of Waterloo, 2007-04-24)The overall objective of this research was to investigate the status of tumor necrosis factor-α (TNF-α), and molecules associated with its signaling, in the pathological state of hepatic steatosis. The effect of NSAID ... -
Occurrence and Seasonal Variability of Selected Pharmaceuticals in Southern Ontario Drinking Water Supplies
(University of Waterloo, 2007-04-27)The presence and seasonal variability of human and veterinary pharmaceuticals in surface water (raw water) and treated water samples from two drinking water facilities in Southern Ontario was investigated. Water samples ... -
1-AMINOCYCLOPROPANE-1-CARBOXYLATE (ACC) DEAMINASE GENES IN RHIZOBIA: ISOLATION AND CHARACTERIZATION
(University of Waterloo, 2007-05-14)A collection of 233 putative Rhizobia strains from 30 different sites across Saskatchewan, Canada was assayed for ACC deaminase activity, with 27 of the strains displaying activity. When all 27 strains were characterized ... -
Regulation of MH Class II Associated Invariant Chain in Oncorhynchus mykiss
(University of Waterloo, 2007-05-22)Major histocompatibility complex (MHC) class II associated invariant chain is a chaperone of the mammalian MHC class II antigen presentation pathway. It is responsible for targeting the MHC class II dimer to the endocytic ... -
Examining oil sands dissolved carbon and microbial degradation using stable isotope analysis
(University of Waterloo, 2007-05-22)Oil sands mining operations in northeastern Alberta are rapidly expanding. Upgrading and extracting the bitumen from the sand requires large volumes of water generating large quantities of oil sands process water/materials ... -
Onion Root Anatomy and the Uptake of Sulphate and Phosphate Ions
(University of Waterloo, 2007-06-12)Ions in the soil solution traverse many layers (epidermis, exodermis, central cortex, and endodermis) within the root to reach the stele. The endodermis is present in almost all vascular plants while the exodermis is found ... -
Impact of non-steroidal anti-inflammatory drugs on the adaptive responses to stress in rainbow trout
(University of Waterloo, 2007-06-19)Pharmaceutical drugs are used extensively by humans and domestic animals. The detection of compounds such as non-steroidal anti-inflammatory drugs (NSAIDs) in effluents of sewage treatment plants and surface waters has ... -
Development and application of plant macrofossils for paleolimnological reconstructions in the Slave River Delta, N.W.T.
(University of Waterloo, 2007-08-29)This thesis combines detailed analyses of living plant communities with paleolimnological methods to develop the use of plant macrofossils as an effective tool to track hydroecological changes in ponds of the Slave River ...