Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"oxygen stress"”.
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Transient structure in benthic communities : the effects of oxygen stress, burial and high rates of sedimentation
… in this study. The effect of low dissolved-oxygen on transient benthic community structure was studied with samples from Golfo Dulce, an intermittently anoxic basin off the west coast of Costa Rica and the Posa de Cariaco, an anoxoic trench off the north coast of Venezuela. Periodic …
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Identification of Near-Uv Chromophores and Characterization of Cellular Responses to Near-Uv Damage and Oxygen Stress
The process in which a chromophore(s) absorbs light energy and transfers it to a cell in a toxic manner is known as the photodynamic effect. DNA is the primary chromophore in the UV-C region of electromagnetic spectrum (100-280nm; also known as Far UV or germicidal-UV), and its interaction with …
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Corn root growth and distribution as influenced by soil physical properties
… and by observing the influence of soil physical stresses on corn seedling root growth in controlled environments. The field soil was Groseclose silt loam (clayey, mixed, mesic Typic Hapludult). Groseclose A horizon material was used for the growth chamber experiments where corn was grown in a …
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Molecular and biochemical characterization of steroid sulfotransferases from Brassica napus and Arabidopsis thaliana
… one hour after treatment. Plants respond to low oxygen stress by a switch to ethanolic fermentation and the induction of anaerobic proteins, including ADH and XET. BNST proteins are induced under low oxygen stress, suggesting that endogenous ethanol may act as a chemical signal regulating gene …
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Characterising mechanisms of regulation of hypoxia-inducible factors.
… have a constant and absolute requirement for oxygen, which is necessary to produce energy for normal cell growth and survival. Mammalian cells adapt to low oxygen stress (hypoxia) through a transcriptional response pathway mediated by the Hypoxia-inducible factor protein, HIF. HIF is a …
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The molecular characterisation of the recA locus in the opportunistic pathogen Bacteroides fragilis
… damage as well as damage caused by oxidative stress. The ability to survive oxygen stress is a strong indicator in an anaerobic bacterium of pathogenic potential and bacterial persistence in the oxygen rich peritoneal cavity. The aim of this thesis was to characterise the B. fragilis recA gene …
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Benthic Community Responses to Hypoxic Conditions in the Lower Rappahannock River, Virginia
<p>The effects of seasonal low dissolved oxygen conditions upon benthic macroinvertebrate communities were studied in the lower Rappahannock River, a tributary of the Chesapeake Bay. Benthic communities were sampled during March, June, August, and September 1993 at five equidistant depths (5, 10, …
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The Ancestry and Function of Cytochrome c6A
… transport chain and thus alleviating reactive oxygen species production; that cytochrome c6A has a signalling role where it could sense high light stress and convey this signal to the nucleus to affect gene expression. This study aims to provide insight into the ancestry and function of …
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Substrate Regulated Microaerophily and Chemotaxis by Pseudomonas jessenii strain VT10
… this LSRMB, and show the relationship between oxygen stress and low-substrate growth media. The concentration of 17:0 cyclopropane fatty acid, a common stress indicator, increased 5-fold, and four additional proteins were produced when P. jessenii strain VT10 was grown at low-substrate levels …
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Normal Glycolytic Enzyme Activity Is Critical For Hypoxia Inducible Factor-1A Activity and Provides Novel Targets For Inhibiting Tumor Growth
… occurs regardless of the concentration of oxygen in the cell and is typically at rates significantly higher than those found in normal cells of the same tissue type. Unlike the case of proliferating cancer cells in culture, the internal environment of most solid tumors is hypoxic due to an …
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Studies of the mechanisms of stabilization of organic matter in semiarid soils
… organic matter in these aggregates is limited by oxygen stress. Occlusion of organic matter in microaggregates is an important mechanism of organic matter stabilization. The concepts of chemical recalcitrance and clay adsorption as mechanisms of organic matter stabilization were studied using …
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Cell lineage choice during differentiation of trophoblast stem cells (tsc) is dependent on oxygen levels, and mediated by stress enzyme pathways and mitochondrial function
<p>In general, stress is defined as a noxious factor in a broad spectrum (chemical, biological or physical). Stress response of human body can be divided into three levels----integrate, organ/tissue or cellular response. Trophoblast tem cell (TSC) is one of the earliest differentiated stem cell …
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Rainbow Trout (Oncorhynchus mykiss) Summer Habitat Use in Lake Spokane, Washington
… movements in an environment that experiences oxygen stress and high water temperatures not meeting preferred levels. Lake Spokane is a 38.62 km long reservoir on the Spokane River located between Long Lake and Nine Mile Falls Dam in Washington State. Long Lake has three reaches, riverine, …
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Studies into the receptor-mediated induction of hypoxia inducible factor 1α.
… to the cellular response upon exposure to low oxygen stress (hypoxia). Post-translational modification of the HIF a-subunit (HIFa) by hydroxylase enzymes has recently been identified as the key 'oxygen sensing' mechanism within the cell. Regulation of HIF is complex; during hypoxia, regulation …