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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

THE ENVIRONMENTAL AND MUSCLE PHYSIOLOGY OF WINTER-ACTIVE AND WINTER-INACTIVE LIZARDS, SCELOPORUS JARROVI AND SCELOPORUS MAGISTER

Schwalbe, Cecil Robert January 1981 (has links)
Field observations indicated a difference in the ability to locomote at low body temperatures in two closely related species of lizards from very different habitats and with radically different seasonal behavior. I measured the critical thermal minimum (the body temperature at which a cooling lizard just loses the ability to right itself) in both species. The winter-active, montane Sceloporus jarrovi had a significantly lower critical thermal minimum in both summer and winter than the winter-hibernating, lowland S. magister. Critical thermal minima were significantly lower in winter than in summer for both species. To determine a physiological basis for these differences, I examined the activity of myosin ATPase, which plays the limiting role in the velocity of muscle contraction, and the energetics of muscle as reflected by high energy phosphate compounds. Microenvironmental conditions were correlated with behavior, constraints on winter activity, and muscle physiology. Ca²⁺-activated myosin ATPase activity in S. magister of valley bottoms is greater than that in the vertical rock-dwelling S. jarrovi. No seasonal acclimatization occurs in myosin ATPase activity in either species. Changes in the muscle metabolism of hibernating animals has been attributed to the lack of muscular contractions in the dormant animals. I measured levels of phosphorylated compounds in a hindlimb muscle from summer and winter lizards of both species. Significant seasonal changes occur in some of the phosphate compounds in both species even though, within a given season, respective levels of phosphorylated compounds are similar in both species. Phosphorylcreatine and total acid-soluble phosphate levels increased in winter animals of both species. Apparently the high levels of phosphorylcreatine in winter S. magister are not simply due to inactivity; winter-active S. jarrovi contain similar amounts. Seasonal cycling of phosphate compounds may relate more to parathyroid status than to muscle activity. Winter activity in S. jarrovi was site-specific and highly dependent on a favorable microclimate. Winter dormancy in S. magister apparently is not dictated by the severity of the microclimate nor physiological limitations of skeletal muscle, but may be strongly influenced by the thermal inertia of that relatively large species.
162

A COMPARATIVE STUDY OF THERMOREGULATION AND WATER BALANCE IN HARES AND RABBITS OF THE SONORAN DESERT

Hinds, David Stewart, 1939- January 1970 (has links)
No description available.
163

HYPOTHALAMIC AND WHOLEBRAIN MONOAMINE LEVELS IN BATS: SOME ASPECTS OF CENTRAL CONTROL OF THERMOREGULATION

Shaskan, Edward G. January 1969 (has links)
No description available.
164

The influence of gender on thermoregulation in pouched mice, Saccostomus campestris.

Mzilikazi, Nomakwezi. 19 December 2013 (has links)
Saccostomus campestris display sexual disparity in the use of summer daily torpor in response to energy stress. The hypothesis that males may compensate for a limited heterothermic capacity with lower normothermic body temperatures by maintaining lower resting metabolic rates relative to females was tested. Furthermore, the influence of testosterone on torpor incidence in males was investigated. Body temperature (T[b]) and oxygen consumption (VO₂) were measured at various ambient temperatures (Tₐ) and were compared between the sexes under food ad libitum and food restriction treatments. There were no significant differences in T[b] and VO₂ between sexes under food ad libitum treatment. Under food restriction there were pronounced sex differences in the employment of heterothermy. Females defended a lower setpoint T[b] for torpor (ca. 25°C), than males (ca. 29°C), and also employed torpor more frequently than males. Non-torpid males did, however show slight reductions in VO₂ under food restriction. The effect of testosterone on daily torpor was investigated by comparing minimum T[b]and torpor frequency of castrated mice implanted with testosterone-filled (experimental) and saline-filled (control) silastic capsules in response to food ad libitum and food restriction treatments. Testosterone inhibited torpor in males. The majority of control animals employed torpor under both food ad libitum and food restriction diets. It was concluded that although the animals were capable of shallow, summer torpor, it was confined to moderate ambient temperatures and was not used at low Tₐ's where several animals became pathologically hypothermic. Females derive energetic benefits from the use of torpor whereas males may partially compensate for their limited heterothennic capacity by a reduction in resting metabolic rates, accompanied by moderate reductions in body temperature during energetically stressful periods. The difference in the capacity for daily heterothenny between sexes was attributed to differences in their reproductive physiology. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 2000.
165

A role for bone morphogenetic protein 8b in brown adipose tissue thermogenesis and energy homeostasis

Whittle, Andrew John January 2011 (has links)
No description available.
166

Mechanism of thermal entrainment of the circadian clock by newly identified post-transcriptional regulation / 新規転写後調節機構による体内時計の温度サイクルへの位相適応メカニズム

Inoue, Yuichi 23 March 2022 (has links)
京都大学 / 新制・課程博士 / 博士(薬科学) / 甲第23841号 / 薬科博第156号 / 新制||薬科||17(附属図書館) / 京都大学大学院薬学研究科医薬創成情報科学専攻 / (主査)教授 土居 雅夫, 教授 中山 和久, 教授 竹島 浩 / 学位規則第4条第1項該当 / Doctor of Pharmaceutical Sciences / Kyoto University / DGAM
167

The effects of thermal biofeedback on sleep onset latency in older adults /

Bothma, Joanna M Unknown Date (has links)
Thesis (MPsy(Clinical))--University of South Australia, 2005.
168

The role of melatonin in human thermoregulation and sleep / by Cameron J. van den Heuvel.

Heuvel, Cameron J. van den January 1998 (has links)
Bibliography: leaves 162-197. / vii, 216 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / To determine the effects of melatonin on sleepiness and body temperature under conditions that better approximated the endogenous melatonin profile. / Thesis (Ph.D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology, 1998?
169

The effects of thermal biofeedback on sleep onset latency in older adults /

Bothma, Joanna M Unknown Date (has links)
Thesis (MPsy(Clinical))--University of South Australia, 2005.
170

Cerebral malaria in children in the highlands of Kenya : aspects of pathogenesis and clinical presentation /

Esamai, Fabian. January 2002 (has links) (PDF)
Diss. (sammanfattning) Linköping : Univ., 2002. / Härtill 5 uppsatser.

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