RESPIRATORY RATE (Qo2) OF ISOLATED LIVER OF WHITE RATS EXPOSED TO SUMMER OR WINTER OUTDOOR ENVIRONMENTAL CONDITIONS

1960 ◽  
Vol 38 (10) ◽  
pp. 1215-1216 ◽  
Author(s):  
O. Héroux ◽  
J. Willmer
Keyword(s):  
Respiratory Rate ◽  
Environmental Conditions ◽  
White Rats ◽  
Isolated Liver

COMPARISON BETWEEN SEASONAL AND THERMAL ACCLIMATION IN WHITE RATS: II. SURFACE TEMPERATURE, VASCULARIZATION, AND IN VITRO RESPIRATION OF THE SKIN

1959 ◽  
Vol 37 (1) ◽  
pp. 1247-1253 ◽  
Author(s):  
O. Héroux
Keyword(s):  
Oxygen Uptake ◽  
Surface Temperature ◽  
Respiratory Rate ◽  
Environmental Conditions ◽  
Cold Temperature ◽  
Dorsal Skin ◽  
Adult Rats ◽  
White Rats ◽  
Different Types

The effect of cold temperature on the skin was studied on white rats exposed to two different types of environmental conditions. Two groups of adult rats kept in individual cages were continuously exposed for 3 months to constant cold temperature (18° and 6 °C) in the laboratory (indoor rats) while other groups of the same colony kept in groups of 10 were exposed for the same length of time to the fluctuating environmental conditions prevailing outside (outdoor rats).Indoor rats acclimated to 18 °C and 6 °C showed the same increase in the number of opened capillaries in the ears over the number observed in controls acclimated to 30 °C. "Summer and winter" outdoor rats showed the same number of capillaries as the "18 °C or 6 °C" indoor rats. Signs of injury healing such as thicker epidermis and larger nuclei were found in the ears of all the "6 °C" rats but in none of the "winter" rats. While the skin temperature measured at + 6 °C was slightly higher (0.4 to 1.0 °C) in rats acclimated at 6 °C than in those at 30 °C, it was lower (1.3 to 2.9 °C) in "winter" than in "summer" rats. After 28 days of acclimation, the rate of oxygen uptake of the dorsal skin of the foot was lower in "6 °C" than in "30 °C" rats but after 84 days it was significantly higher in the cold-acclimated rats. Similarly, after 3 months, the respiratory rate of the dorsal skin of the foot was higher in "winter" rats than in "summer" rats.

COMPARISON BETWEEN SEASONAL AND THERMAL ACCLIMATION IN WHITE RATS: II. SURFACE TEMPERATURE, VASCULARIZATION, AND IN VITRO RESPIRATION OF THE SKIN

1959 ◽  
Vol 37 (11) ◽  
pp. 1247-1253 ◽  
Author(s):  
O. Héroux
Keyword(s):  
Oxygen Uptake ◽  
Surface Temperature ◽  
Respiratory Rate ◽  
Environmental Conditions ◽  
Cold Temperature ◽  
Dorsal Skin ◽  
Adult Rats ◽  
White Rats ◽  
Different Types

The effect of cold temperature on the skin was studied on white rats exposed to two different types of environmental conditions. Two groups of adult rats kept in individual cages were continuously exposed for 3 months to constant cold temperature (18° and 6 °C) in the laboratory (indoor rats) while other groups of the same colony kept in groups of 10 were exposed for the same length of time to the fluctuating environmental conditions prevailing outside (outdoor rats).Indoor rats acclimated to 18 °C and 6 °C showed the same increase in the number of opened capillaries in the ears over the number observed in controls acclimated to 30 °C. "Summer and winter" outdoor rats showed the same number of capillaries as the "18 °C or 6 °C" indoor rats. Signs of injury healing such as thicker epidermis and larger nuclei were found in the ears of all the "6 °C" rats but in none of the "winter" rats. While the skin temperature measured at + 6 °C was slightly higher (0.4 to 1.0 °C) in rats acclimated at 6 °C than in those at 30 °C, it was lower (1.3 to 2.9 °C) in "winter" than in "summer" rats. After 28 days of acclimation, the rate of oxygen uptake of the dorsal skin of the foot was lower in "6 °C" than in "30 °C" rats but after 84 days it was significantly higher in the cold-acclimated rats. Similarly, after 3 months, the respiratory rate of the dorsal skin of the foot was higher in "winter" rats than in "summer" rats.

SEASONAL ADJUSTMENTS IN CAPTURED WILD NORWAY RATS: III. PRODUCTION OF ADRENAL STEROIDS IN VITRO

1963 ◽  
Vol 41 (1) ◽  
pp. 1147-1153
Author(s):  
J. S. Willmer ◽  
O. Héroux
Keyword(s):  
Environmental Conditions ◽  
Rattus Norvegicus ◽  
Seasonal Effect ◽  
Seasonal Adjustment ◽  
Adrenal Steroids ◽  
Steroid Secretion ◽  
Adrenal Steroid ◽  
White Rats ◽  
Norway Rats

The in vitro adrenal steroid secretion of wild Norway rats (Rattus norvegicus) captured during the winter differed in quantity, but not in quality, from that of similar rats captured during the summer. Whereas there was no evident seasonal effect on adrenal weight either in males or in females, adrenals of both sexes secreted at a faster rate during the winter than during the summer, this increase involving the four groups of steroids characterized chromatographically during both seasons and in both sexes; the predominant steroid secreted was corticosterone. This seasonal adjustment in adrenal activity is similar to that observed in white rats kept in group cages exposed outdoors to the natural summer and winter environmental conditions, but it differs from that found in white rats cold-acclimated in the laboratory, in which adrenal activity is lower than normal after cold acclimation.

COMPARISON BETWEEN SEASONAL AND THERMAL ACCLIMATION IN WHITE RATS: I. METABOLIC AND INSULATIVE CHANGES

1959 ◽  
Vol 37 (3) ◽  
pp. 473-478 ◽  
Author(s):  
O. Héroux ◽  
F. Depocas ◽  
J. S. Hart
Keyword(s):  
Metabolic Rate ◽  
Constant Temperature ◽  
Environmental Conditions ◽  
Resting Metabolic Rate ◽  
Thermal Acclimation ◽  
Cold Temperature ◽  
Metabolic Rates ◽  
Temperature Range ◽  
White Rats ◽  
Physiological Adjustments

Physiological adjustments to cold temperature have been compared in white rats exposed either to the outdoor fluctuating environmental conditions or to the indoor constant temperature conditions. While the metabolic adjustments such as increased peak metabolism and decreased shivering were similar in outdoor and indoor rats exposed to cold, the adjustments in insulation and thermoneutral metabolic rates were quite different. The pelage insulation increased in the rats kept outside during the winter but remained unchanged in the rats kept in a constant temperature room maintained at 6 °C. The resting metabolic rate measured at 30 °C increased in the 6 °C acclimated rats but not in the winter-exposed animals. Over the temperature range +30 °C to −15 °C, while the indoor cold-acclimated rats had a higher metabolic rate than their controls acclimated to 30 °C, the winter rats had a lower metabolism than their summer controls.

SEASONAL ADJUSTMENTS IN CAPTURED WILD NORWAY RATS: III. PRODUCTION OF ADRENAL STEROIDS IN VITRO

1963 ◽  
Vol 41 (5) ◽  
pp. 1147-1153 ◽  
Author(s):  
J. S. Willmer ◽  
O. Héroux
Keyword(s):  
Environmental Conditions ◽  
Rattus Norvegicus ◽  
Seasonal Effect ◽  
Seasonal Adjustment ◽  
Adrenal Steroids ◽  
Steroid Secretion ◽  
Adrenal Steroid ◽  
White Rats ◽  
Norway Rats

The in vitro adrenal steroid secretion of wild Norway rats (Rattus norvegicus) captured during the winter differed in quantity, but not in quality, from that of similar rats captured during the summer. Whereas there was no evident seasonal effect on adrenal weight either in males or in females, adrenals of both sexes secreted at a faster rate during the winter than during the summer, this increase involving the four groups of steroids characterized chromatographically during both seasons and in both sexes; the predominant steroid secreted was corticosterone. This seasonal adjustment in adrenal activity is similar to that observed in white rats kept in group cages exposed outdoors to the natural summer and winter environmental conditions, but it differs from that found in white rats cold-acclimated in the laboratory, in which adrenal activity is lower than normal after cold acclimation.

scholarly journals The role of opioid peptides in regulation of bile secretion in intact and isolated liver

2006 ◽  
Vol 5 (3) ◽  
pp. 125-127
Author(s):  
I. V. Roudin ◽  
M. A. Medvedev
Keyword(s):  
Opioid Peptides ◽  
Bile Secretion ◽  
Perfused Liver ◽  
Isolated Perfused Liver ◽  
White Rats ◽  
Isolated Liver

Influence of dalargin (non-selective mand d-аgonist), DADLE (selective) and DAGO (selective magonist) on the bile secretion frequency and cholates secretion was studied in acute experiments on isolated perfused liver of the white rats. Opioid peptides effects on isolated liver were revealed to mask by the higher levels of hierarchic regulation in intact liver.

DYNAMICS OF INDEXES OF EXTERNAL BREATH AND BEHAVIOR ACTIVITIES OF WHITE RATS WHEN EXPOSED TO A SUBSTANCE OF THE CS TYPE

2018 ◽  
pp. 13-17
Author(s):  
L. P. Erdniev ◽  
D. V. Gorbunov ◽  
Y. A. Stepanov ◽  
E. Y. Andreeva ◽  
L. V. Gorbunova ◽  
...  
Keyword(s):  
Motor Activity ◽  
Respiratory Rate ◽  
Minute Volume ◽  
External Respiration ◽  
Respiratory Volume ◽  
White Rats ◽  
Respiratory Minute Volume ◽  
Significant Change ◽  
And Behavior

The indexes of external respiration of white rats exposed by inhalation to a substance of the CS type were estimated. Increase in the respiratory volume and respiratory minute volume as well as the absence of changes in respiratory rate when exposed to the formulation at the level of effective inhalation toxodosis has been found. It has been established that substance of the CS type causes a significant change in motor activity.

COMPARISON BETWEEN SEASONAL AND THERMAL ACCLIMATION IN WHITE RATS: I. METABOLIC AND INSULATIVE CHANGES

1959 ◽  
Vol 37 (1) ◽  
pp. 473-478 ◽  
Author(s):  
O. Héroux ◽  
F. Depocas ◽  
J. S. Hart
Keyword(s):  
Metabolic Rate ◽  
Constant Temperature ◽  
Environmental Conditions ◽  
Resting Metabolic Rate ◽  
Thermal Acclimation ◽  
Cold Temperature ◽  
Metabolic Rates ◽  
Temperature Range ◽  
White Rats ◽  
Physiological Adjustments

Physiological adjustments to cold temperature have been compared in white rats exposed either to the outdoor fluctuating environmental conditions or to the indoor constant temperature conditions. While the metabolic adjustments such as increased peak metabolism and decreased shivering were similar in outdoor and indoor rats exposed to cold, the adjustments in insulation and thermoneutral metabolic rates were quite different. The pelage insulation increased in the rats kept outside during the winter but remained unchanged in the rats kept in a constant temperature room maintained at 6 °C. The resting metabolic rate measured at 30 °C increased in the 6 °C acclimated rats but not in the winter-exposed animals. Over the temperature range +30 °C to −15 °C, while the indoor cold-acclimated rats had a higher metabolic rate than their controls acclimated to 30 °C, the winter rats had a lower metabolism than their summer controls.

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

Sign in / Sign up

Export Citation Format

Share Document