Studies on Temperature Regulation

1946 ◽  
Vol 22 (3-4) ◽  
pp. 213-220
Author(s):  
R. L. KIRK ◽  
LANCELOT HOGBEN
Keyword(s):  
Body Temperature ◽  
Rana Temporaria ◽  
Large Body ◽  
Bufo Bufo ◽  
Thermal Capacity ◽  
The Body ◽  
External Temperature ◽  
Terrestrial Vertebrates ◽  
Temperature And Humidity ◽  
Frog Rana Temporaria

1. The upper thermal death-point of the slow worm (Anguis fragilis) is significantly above that of either the toad (Bufo bufo) or the frog (Rana temporaria). That of the toad differs only slightly from that of the frog. 2. In response to external variation with respect to temperature and humidity, the body temperature of the toad behaves in a manner similar to that of the frog, being considerably below that of the air at low humidities, though appreciably above that of the wet-bulb thermometer. It is concluded that the toad loses water as freely as the frog. 3. The body temperature of the slow worm and that of the alligator (A. mississippiensis) differs only slightly from that of the air under all conditions of sustained air temperature and humidity. 4. The body temperature reaction of the alligator is more sluggish than that of the slow worm, presumably owing to the higher thermal capacity of the animal. 5. The significance of these results in relation to the evolution of the terrestrial vertebrates is discussed. It is suggested that homoeothermic stocks could arise only from reptiles of relatively small size, and that large body size would militate against survival during periods of low mean external temperature.

Susceptibility of frog (Rana temporaria) and toad (Bufo bufo) eggs to invasion by Saprolegnia

2003 ◽  
Vol 24 (3) ◽  
pp. 261-268 ◽  
Author(s):  
Richard Griffiths ◽  
Jim Robinson ◽  
Peter Jeffries
Keyword(s):  
Reproductive Effort ◽  
Rana Temporaria ◽  
Bufo Bufo ◽  
Susceptibility To Infection ◽  
Early Stages ◽  
Frog Rana Temporaria ◽  
Toad Bufo ◽  
Toad Bufo Bufo ◽  
Development Proceeds

AbstractInfections of amphibian eggs sometimes cause catastrophic losses of reproductive effort, but susceptibility to infection in different species is poorly understood. Using laboratory trials we showed that direct hyphal invasion of adjacent eggs by Saprolegnia caused a higher incidence of infection than invasion by zoospores. Moreover, we observed that dead eggs were much more readily colonized than live eggs when challenged with zoospores from two strains of Saprolegnia. The two strains were equally effective in causing infections of Rana temporaria eggs, but differed in their ability to infect eggs of Bufo bufo. In live R. temporaria eggs, early stages (pre-tailbud) were more frequently infected by hyphal invasion than later stages by the same strains, suggesting that susceptibility to infection decreases as development proceeds.

Hormonal induction of spermatozoa from amphibians with Rana temporaria and Bufo bufo as anuran models

2012 ◽  
Vol 24 (4) ◽  
pp. 599 ◽  
Author(s):  
V. K. Uteshev ◽  
N. V. Shishova ◽  
S. A. Kaurova ◽  
R. K. Browne ◽  
E. N. Gakhova
Keyword(s):  
Rana Temporaria ◽  
Membrane Integrity ◽  
Bufo Bufo ◽  
Valuable Component ◽  
Progressive Motility ◽  
Frog Rana Temporaria ◽  
The Common ◽  
Hormonal Priming ◽  
Toad Bufo ◽  
Toad Bufo Bufo

The use of hormonally induced spermatozoa expressed in urine (HISu) is a valuable component of reproduction technologies for amphibians. Five protocols for sampling HISu from the European common frog (Rana temporaria) were compared: (1) pituitary extracts, (2) 0.12 µg g–1 luteinising hormone-releasing hormone analogue (LHRHa), (3) 1.20 µg g–1 LHRHa, (4) 11.7 IU g–1 human chorionic gonadotrophin (hCG) and (5) 23.4 IU g–1 hCG (g–1 = per gram bodyweight). From 1 to 24 h after administration we assessed the number and concentration of spermatozoa in spermic urine and in holding water, and in urine the percentage of motile spermatozoa and their progressive motility. The protocol using 1.20 µg g–1 LHRHa gave the highest total sperm numbers (650 × 106) and the highest percentage (40%) of samples with sperm concentrations above 200 × 106 mL–1. The percentage motility and progressive motility was similar from all protocols. Considerable amounts of spermatozoa were expressed by R. temporaria into their holding water. We tested hormonal priming and spermiation in the common toad (Bufo bufo) using 0.13 µg g–1 LHRHa administered 24 h before a final spermiating dose of 12.8 IU g–1 hCG. No spermatozoa were expressed in holding water. Priming resulted in 35% more spermatozoa than without; however, there were no differences in sperm concentrations. Primed B. bufo produced spermatozoa with significantly higher percentage motility, but not progressive motility, membrane integrity, or abnormal spermatozoa than unprimed males.

scholarly journals Interaction between temperature and hypoxia in the alligator

1993 ◽  
Vol 265 (6) ◽  
pp. R1339-R1343 ◽  
Author(s):  
L. G. Branco ◽  
H. O. Portner ◽  
S. C. Wood
Keyword(s):  
Body Temperature ◽  
Blood Gases ◽  
The Body ◽  
Plasma Lactate ◽  
Acid Base ◽  
Terrestrial Vertebrates ◽  
Beneficial Response ◽  
Acid Base Status ◽  
Induced Changes ◽  
Selected Body Temperature

Hypoxia elicits behavioral hypothermia in alligators. Under normoxic conditions, the selected body temperature is 27.8 +/- 1.2 degrees C. However, when inspired O2 is lowered to 4%, selected body temperature decreases to 15.4 +/- 1.0 degrees C. The threshold for the behavioral hypothermia is between 4 and 5% inspired O2, the lowest threshold measured so far in terrestrial vertebrates. This study assessed the physiological significance of the behavioral hypothermia. The body temperature was clamped at 15, 25, and 35 degrees C for measurements of ventilation, blood gases, metabolic rate, plasma lactate, and acid-base status. Hypoxia-induced changes in ventilation, acid-base status, oxygen consumption, and lactate were proportional to body temperature, being pronounced at 35 degrees C, less at 25 degrees C, and absent at 15 degrees C. The correlation between selected body temperature under severe hypoxia and the measured parameters show that behavioral hypothermia is a beneficial response to hypoxia in alligators.

scholarly journals A Smart Pillow for Health Sensing System Based on Temperature and Humidity Sensors

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3664 ◽  
Author(s):  
Songsheng Li ◽  
Christopher Chiu
Keyword(s):  
Body Temperature ◽  
Night Sweat ◽  
The Body ◽  
Humidity Sensors ◽  
Sensing System ◽  
Temperature And Humidity ◽  
Sleep Condition ◽  
Logic System ◽  
Analyze Data

The quality of sleep affects the patient’s health, along with the observation of vital life signs such as body temperature and sweat in sleep, is essential in the monitoring of sleep as well as clinical diagnosis. However, traditional methods in recording physiological change amidst sleep is difficult without being intrusive. The smart pillow is developed to provide a relatively easy way to observe one’s sleep condition, employing temperature and humidity sensors by implanting them inside the pillow in strategic positions. With the patient’s head on the pillow, the roles of sensors are identified as main, auxiliary or environmental temperature, based on the differences of value from three temperature sensors, thus the pattern of sleep can be extracted by statistical analysis, and the body temperature is inferred by a specially designed Fuzzy Logic System if the head-on position is stable for more than 15 min. Night sweat is reported on data from the humidity sensor. Therefore, a cloud-based health-sensing system is built in the smart pillow to collect and analyze data. Experiments from various individuals prove that statistical and inferred results reflect normal and abnormal conditions of sleep accurately. The daily sleeping information of patients from the pillow is helpful in the decision-making of diagnoses and treatment, and users can change their habits of sleep gradually by observing the data with their health professional.

scholarly journals The Temperature and Humidity Relations of the cockroach

1936 ◽  
Vol 13 (1) ◽  
pp. 28-34
Author(s):  
DONALD L. GUNN ◽  
F. B. NOTLEY
Keyword(s):  
Body Temperature ◽  
The Body ◽  
Moist Air ◽  
Dry Air ◽  
Thermal Death ◽  
Temperature And Humidity ◽  
Ecological Importance

1. The thermal death-points of three species of cockroaches in dry and in moist air have been determined for 1-day and 1-hour exposures. 2. Moist air is more favourable than dry in the longer exposures, because in dry air death occurs from desiccation when the temperature itself is not fatal. 3. Dry air is more favourable than moist in the shorter exposures, owing to the fact that the evaporation of water lowers the body temperature. 4. Bearing in mind the thermotactic behaviour of these animals, these observations would seem to have little ecological importance.

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