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 20 of 21 for “"acute heat"”.
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Molecular responses of neonatally heat stressed broilers exposed to acute heat stress
… age increases their survival when exposed to a heat challenge at 6 weeks of age (35.0-37.8 C; RH 50% ). This' phenomenon does not resemble acclimation since the physiological changes known to occur in acclimated birds exposed to heat have not been observed in the neonatally stressed birds. A …
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The impact of acute heat exposure on the heat shock response (HSR) between males and females
While acute heat stress induces genomic changes in immune cells of young adults, the influence of ovarian hormones on the molecular response remains unclear, despite their documented role in thermoregulation. This study investigated the molecular response to acute heat stress in males (n=11), …
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Effects of Acute Heat and Oxidative Stress on the Hepatic Expression of Orexin and Its Related Receptors
… study, we sought to determine the effects of heat and oxidative stress using hydrogen peroxide (H2O2) and 4-hydroxynonenal (4-HNE) on the hepatic expression of ORX and ORXR1/2 in the avian species. Overall, heat stress significantly down regulated the expression of ORX, and ORXR1/2 mRNA and …
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The Cardiovascular Responses of Domestic Fowl to Elevated Ambient Temperatures
… thermoregulatory responses of chickens during an acute heat challenge at 35(DEGREES)C ambient temperature (T(,a)). In the first experiment eight mature Single Comb White Leghorn hens, maintained at 25(DEGREES)C T(,a), were subj
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Not Too Hot, Not Too Cold, But Moderately Variable: The Influence of Environmental Variability on Coral Thermal Tolerance
… increase in the frequency and severity of marine heat waves, resulting in declining health of coral reef ecosystems worldwide. Coral bleaching events – the breakdown in symbiosis between the coral host and their intracellular photosynthetic algae – are increasingly common in recent years and …
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Evaluation of a cool pad for thermoregulation in sows
… pad as a thermoregulatory device for alleviating heat stress in farrowing and open sows. Different physiological and behavioral variables were analyzed during exposure of the animals to acute or long term heat stress in these studies. The physiological variables measured included: respiration rate …
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The Effects of High Environmental Temperature Induced Acid-Base Disturbance on The Utilization of Calcium by The Domestic Hen
The effects of an acute heat stress (35(DEGREES)C) on respiratory rate, blood pH, blood PCO(,2) and blood HCO(,3)('-) concentration was investigated in SCWL hens. Within one hour after initiation of heat challenge, respiratory rate was significantly (P < .01) elevated which led to blood alkalosis …
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Effects of estrogen and progesterone on tolerance to thermal stress
… rats may have resulted from a decrease in heat loss as evidenced by the lower tail skin temperatures. Hormonal treatment did not impair the animal's thermoregulatory responses during acute heat and cold exposure. However, body weight was highest in P treated rats. The body weight of EP …
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A proteomic investigation of the heat stress response of the South African abalone haliotis midae
… regulated in haemocytes during exposure to acute heat stress. Identifying which biochemical pathways are involved in the abalone stress response will give some insight into the molecular mechanism by which H. midae responds to heat stress.
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Acute and chronic heat stress alters the metabolic profile of skeletal muscle in growing swine
Heat stress (HS) causes significant losses to the U.S. swine industry in several production and health areas including efficient lean tissue accretion. Perturbations in skeletal muscle metabolism may participate in this defect. The study objectives were to examine the cellular bioenergetic profile …
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SENSITIVITY AND RESILIENCE OF CNIDARIAN EARLY LIFE PROCESSES TO ANTHROPOGENIC CLIMATE CHANGE
… exposure to intermediate (but not low or high) acute heat stress improved short-term climate resilience (e.g., heat tolerance) in early life stages of the sea anemone Nematostella vectensis, demonstrating hormetic conditioning. We also found that exposure to seawater hypoxia disturbed aerobic …
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Traumatic Brain Injury As An Environmental Risk Factor For Neurodegeneration: Elucidating Causal Mechanisms With Drosophila
… proteasomal and chaperone activity. An acute boost of the stress response system through increase of the transcriptional regulator heat shock factor, or through an environmental sub-acute heat stress alleviates the lifespan and brain degeneration deficits of the severe dTBI. Together, …
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Effect of neonatal heat stress on growth, mortality and blood characteristics of juvenile broilers exposed to high ambient temperature
… indicated that exposure of broiler cockerels to acute heat for 24 hr at five days of age increased their survivability when exposed to high ambient temperature prior to market. Since they were conducted at low relative humidity, the aims of the present study were to determine if higher relative …
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The Impact of Heat Stress on Immune Function
… crisis and its implications for global health. Heat waves are becoming increasingly common, intense and long. High ambient temperatures can not only shape pathogen dynamics but also induce a stress response in the host, which may compromise vaccine responsiveness and increase vulnerability to …
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Hypoxia and thermal tolerance in New Zealand triplefin fishes
… but few species are subjected to the extreme acute changes in O₂ availability and temperature faced by fishes inhabiting intertidal rock pools. This thesis, with a focus on intertidal species, explores the physiological responses of New Zealand triplefin fishes to variability in O₂ …
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The Effects of Ocean Acidification on Multiple Life History Stages of the Pacific Oyster, Crassostrea gigas: Implications for Physiological Trade-offs
… microstructure, and mortality in response to heat shock. There was a significant impact of ocean acidification on oyster shell integrity, but no effects after one month of exposure on relative amounts of fatty acid, glycogen or response to acute heat shock. Through the proteomic analysis, we …
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Heat Waves, Early Birth, and Vulnerable Populations: Epidemiological and Spatial Analyses in the United States
Heat waves are a serious and growing threat to human health and society. While there is no single definition of a heat wave, elevated morbidity and mortality during extreme heat is consistently observed in addition to other societal impacts, such as strain on the energy infrastructure, drought, and …
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Investigating coordination between stress-induced translational and transcriptional attenuation
… b (P-TEFb) complex, cyclin T1 (CCNT1), during acute heat shock (HS) and oxidative stress in cellulo. In identical conditions, CCNT1 overexpression has been shown to regulate the rate of ISR recovery. Multiple mechanisms of action have been suggested for further research; CCNT1 may interact with …
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Heat management strategies in elite rugby sevens
… of this thesis was to develop and implement heat management strategies for international elite men’s and women’s rugby sevens teams competing in hot and humid conditions. The first three of six experimental chapters aimed to characterise the physiological, perceptual, and performance …
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