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in subjects: "thermoregulation"  
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Energy metabolism and thermoregulation in old age

Description: Over their life spans, mice and men alike show a 15 to 30% decrease in their minimum, or resting, levels of energy metabolism, and a 50 to 70% decrease in the metabolism of activity. This, together with age-decrements in the capacity to regulate heat loss, makes the old person more susceptible to hypothermia that the young. Two independent relations of length of life to metabolic rate have been found in mice. First, as average metabolic rate increases, survival time decreases, and second, as th… more
Date: January 1, 1979
Creator: Sacher, G.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrative studies of thermoregulation in ectothermic vertebrates in aquatic habitats. Annual progress report, 1 October 1980-30 September 1981

Description: Field experiments are underway to determine the behavioral mechanisms by which largemouth bass, Micropterus salmoides, respond to rapid temperature changes in their natural environment. Laboratory experiments are clarifying the relationship between basking behavior of the turtle, Pseudemys scripta and its nutritional state. Important progress has been made in the development and miniaturization of a multichannel, temperature sensing, radio transmitter for fish. Theoretical analysis and mathemat… more
Date: May 1, 1981
Creator: Spotila, J R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Continuation of studies on thermoregulation of fish and turtles in thermally stressed habitats. Summary progress report, 1 October 1977-30 September 1980

Description: Biophysical-behavioral-ecological models have been completed to explain the behavioral thermoregulation of largemouth bass (Micropterus salmoides) and turtles (Chrysemys scripta). Steady state and time dependent mathematical models accurately predict the body temperatures of largemouth bass. Field experiments using multichannel radio transmitters have provided temperatures of several body compartments of free ranging bass in their natural habitat. Initial studies have been completed to describe… more
Date: May 1, 1980
Creator: Spotila, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Continuation of studies on thermoregulation of fish and turtles in thermally stressed habitats. Annual progress report, 1 October 1979-30 September 1980

Description: Fundamental and realized climate spaces were calculated for the turtle Chrysemys scripta. These allow predictions about the effect of microclimate and thermal effluents on the behavior of these animals to be made. A conceptual model to define the biophysical-behavioral thermoregulatory mechanisms employed by this turtle is being finalized. Operative environmental temperature (T/sub e/) is a good predictor of the basking behavior of turtles. T/sub e/ is positively related to visible and thermal … more
Date: May 1, 1980
Creator: Spotila, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermoregulation of fish and turtles in thermally stressed habitats. Annual progress report, October 1, 1977--September 30, 1978

Description: Morphometric and heating and cooling studies on over 100 largemouth bass, Micropterus salmoides, have provided the data needed to refine the time-dependent body temperature model for fish. The model can now track the changes in body temperature of a bass if its weight and water temperature are known. The model is most sensitive to body diameter, body wall thickness, and tissue conductivity. Doubling tissue conductivity is equivalent to decreasing body diameter by a factor or two. Turtles, Chrys… more
Date: June 1, 1978
Creator: Spotila, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Microwaves affect thermoregulatory behavior in rats

Description: Rats, with their fur clipped, pressed a lever to turn on an infrared lamp while in a cold chamber. When 2450 Megahertz continuous wave microwaves were presented for 15 minutes, the rate of turning on the infrared lamp decreased as a function of the microwave power density, which ranged between 5 MW/cm/sup 2/ and 20 MW/cm/sup 2/. This result indicates that behaviorally significant levels of heating occur at exposure durations and intensities that do not produce reliable changes in either colonic… more
Date: January 1, 1979
Creator: Stern, S.; Margolin, L.; Weiss, B.; Lu, S.T. & Michaelson, S.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Report to the William and Flora Hewlett Foundation

Description: A biological model is presented for determining effects of an environmetal variable on a physiological variable. The effect of an environmental variable, temperature, on a physiological variable, oxygen consumption, was studied. (HLW) Measurements were made on oxygen consumption of mice following exposure to different temperatures. A graph is presented to show results. A model was developed to show: thermal regulation; ratio of change in heat production to change in body temperature; thermal ca… more
Date: December 1, 1978
Creator: Eisner, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Continuation of studies on thermoregulation of fish and turtles in thermally stressed habitats. Annual progress report, 1 October 1978-30 September 1979

Description: A time dependent mathematical model accurately predicts heart, brain, and gut temperatures of largemouth bass. Body diameter, insulation thickness, and tissue thermal conductivity are controlling variables in the transfer of heat between a fish and water. Fish metabolic rate and water velocity across fish surfaces do not appreciably affect heat transfer rates. Multichannel temperature transmitters telemeter body temperatures of free swimming bass in Pond C on the Savannah River Plant while the … more
Date: June 1, 1979
Creator: Spotila, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Roles of Genic Behavioral and Biochemical Mechanisms in the Adaption of Minnows of the Genus Notropis (Cyprinidae) to Temperature

Description: Electrophoretic variation at twenty gene loci, patterns of behavioral thermoregulation, and genotype-specific malate dehydrogenase kinetics were investigated among populations of the red shiner, Notropis lutrensis, and the blacktail shiner, N. venustus, collected from thermally altered and thermally unaltered portions of their ranges. Genic variation was found to be high among red shiners and low among blacktail shiners. The behavioral response of the blacktail shiner to temperature was fixed a… more
Date: December 1981
Creator: Calhoun, Stuart W. (Stuart Wayne)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Life History and Contributions to the Ecology of Camelobaetidius variabilis Wiersema 1998 (Ephemeroptera: Baetidae) in Honey Creek, Oklahoma

Description: A study of the life history and ecology of Camelobaetidius variabilis was conducted in Honey Creek, OK from February 2003-April 2004. Nymph development was assessed using changes in external morphology. Laboratory reared nymphs were used to calculate number of degree days to complete development (772 degree days at 20.8° C ±.38° C), which was used to determine voltinism. Field collected nymph microhabitat distribution was used in assessing microhabitat distribution. Nymphal thermoregulation … more
Date: December 2005
Creator: Perry, Heather A.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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