The Effects of Pituitrin and of Narcosis on Water-Regulation in Larval and Metamorphosed Amblystoma

1927 ◽  
Vol 5 (1) ◽  
pp. 89-96
Author(s):  
J. BĚLEHRÁDEK ◽  
J. S. HUXLEY
Keyword(s):  
Body Weight ◽  
Oxygen Consumption ◽  
Water Content ◽  
Water Intake ◽  
Larval Stage ◽  
The Body ◽  
Pituitary Extract ◽  
Water Regulation ◽  
Imperfect State ◽  
Water Equilibrium

(1) Injection of post-pituitary extract to larval and adult Amblystoma individuals leads to an increased water-intake, followed by a decrease in water-content the body, the decrease being greater than the preliminary increase. Repeated injections cause decreases of body-weight of over 35 per cent. (2) This effect runs parallel with the chromatophore effect. No change in oxygen consumption could be detected, even with long continued injection. (3) Both larval and metamorphosed Amblystoma lose weight (by loss of water) when narcotised in a solution of amytal 1 : 3000; the loss is greater in larval specimens; the decrease is followed, in metamorphosed animals, by a slight net increase. (4) Both the pituitary effect and the amytal effect develop considerably more quickly in larval than in metamorphosed Amblystoma. (5) The mechanism regulating the water-equilibrium of the body in Amblystoma passes, during metamorphosis, from a relatively imperfect state in the larval stage to a more efficient condition in adult individuals.

Specific Susceptibility to HCN and the amount of HCN recovered from Fumigated Insects

1951 ◽  
Vol 42 (2) ◽  
pp. 399-418 ◽  
Author(s):  
S. Pradhan ◽  
S. C. Bhatia
Keyword(s):  
Body Weight ◽  
Water Content ◽  
Relative Position ◽  
Surface Resistance ◽  
Internal Resistance ◽  
Effective Resistance ◽  
The Body ◽  
Effective Dosage ◽  
Adult Females ◽  
The Dead

The relationship was studied between susceptibility of a number of different species of insects to HCN fumigation and the recovery of HCN from them immediately after fumigation.The test insects used were Tribolium castaneum, seventh stage caterpillars of Corcyra cephalonica, first-and second-instar nymphs of Drosicha sp., third-and fourthinstar nymphs of Drosicha sp. and adult females of Drosicha sp.The apparatus and methods used in the fumigation and in the recovery of HCN from the fumigated insects are fully described.Preliminary expsriments showed that the processes of distillation and redistillation did not affect the recovery of HCN but that the result obtained for recovery from distillation could be affected if some volatile reducing substance were produced and carried over to the distillate. It was found that this did actually take place in the case of one of the test insects—T. castaneum—but that redistillation got rid of the impurity.In the main experiments it was shown that, on the assumption that the concentration of HCN to which insects are exposed is the effective dosage, the susceptibility of the test insects varied in the following descending order : firstand second-stage nymphs of Drosicha sp. > third- and fourth-stage nymphs of Drosicha sp.>C. cephalonica> T. castaneum>the adult females of Drosicha sp.When the same insects were arranged in descending order of the quantities of HCN recovered per 100 gm. of body weight, the order was identical except for the nymphs of Drosicha sp. which occupied a different relative position. The two categories of nymphs of Drosicha sp. were found to occupy a different relative position again with regard to the other three test insects when exposed to a superlethal concentration and assessed for recovery of HCN per 100 gr. body weight.Parallel batches of T. castaneum and C. cephalonica were fumigated and the HCN was recovered from the dead and survivors. More HCN was recovered from the dead insects than from those that survived.Both recovery and sorption of HCN were estimated separately in parallel batches of insects (adult females of Drosicha sp. and C. cephalonica). Recovery was found to be less than sorption showing that a part of the HCN absorbed is converted into a non-recoverable state. Further, that the weight of HCN sorbed per gram body weight of adult females of Drosicha sp. is much less than in the case of C. cephalonica under similar conditions of fumigation and that the amount of HCN converted into non-recoverable products is less in Drosicha adults than in C. cephalonica.A comparison of the water content of T. castaneum, C. cephalonica and Drosicha sp. (adults) showed that there was a positive correlation between water content and higher susceptibility to HCN and greater recovery of HCN was also indicated. It is suggested that this may be a factor in the “ Surface Resistance ” of an insec to a fumigant.The observations of previous workers that larger amounts are sorbed by or recovered (after fumigation) from more susceptible species than for those less susceptible was corroborated by the results obtained with C. cephalonica, T. castaneum and adult females of Drosicha sp. but not with those from nymphs of Drosicha sp.When dosage-mortality graphs were prepared by taking the amount of HCN recovered per gram body weight as an index of internal dose, the order of resistance of different test insects based on this new criterion was found to be entirely different from that based on the usual criterion of the concentration of HCN in the fumatorium being the index of effective dosage.These apparently anomalous observations may be explained by assuming that the resistance shown by an insect in an actual fumigation operation, i.e., to the concentration of HCN to which it is exposed (external dose) is what may be called the total “ Effective Resistance ” and that this “ Effective Resistance ” is the resultant of (a) “ Surface Resistance ” to the entry of fumigant and (b) “ Internal Resistance ” to the amount of HCN which actually gains entry into the body in some way or other. Thus the “Effective Resistance ” of an insect may be due to a combination either of low “ Surface Resistance ” and high “ Internal Resistance ”, giving a very low “ Effective Resistance ” as in the case of C. cephalonica, or vice versa giving the maximum “ Effective Resistance ” as in adult females of Drosicha sp. The lower recovery of HCN from the nymphs of Drosicha sp., although they were more susceptible to fumigation than C. cephalonica, is explained by their higher “ Surface Resistance ” combined with a very much lower “ Internal Resistance ”, leading to a lower “ Effective Resistance ”.

The Water Relations of Earthworms

1956 ◽  
Vol 33 (1) ◽  
pp. 29-44 ◽  
Author(s):  
BETTY I. ROOTS
Keyword(s):  
Body Weight ◽  
Water Content ◽  
Water Relations ◽  
Filter Paper ◽  
Tap Water ◽  
Lumbricus Terrestris ◽  
The Body ◽  
Glass Tubes ◽  
Allolobophora Chlorotica

1. The water content of Lumbricus terrestris, after keeping on moist filter-paper for 3 or 4 days, is 84.8% of its body weight. That of Allolobophora chlorotica is 80% of its body weight. Both species can survive a loss of 60% of the body weight, but not much more. 2. Earthworms of the species A. chlorotica, A. terrestris f. longa, Dendrobaena subrubicunda, L. rubellus and L. terrestris are all able to survive from 31 to 50 weeks in soil totally submerged beneath aerated water. The same species, and A. caliginosa can survive for 72-137 days in aerated tap water without food. 3. Garden specimens of A. chlorotica make U-shaped burrows in soil beneath water. They do not irrigate either the burrows or glass tubes. Egg-cocoons of A. chlorotica, taken from culture pots of soil, will hatch under water and the young worms will feed and grow though totally immersed.

Effects of altitude acclimatization on rat myoglobin. Changes in myoglobin content of skeletal and cardiac muscle

1959 ◽  
Vol 196 (3) ◽  
pp. 512-516 ◽  
Author(s):  
Adam Anthony ◽  
Eugene Ackerman ◽  
G. K. Strother
Keyword(s):  
Skeletal Muscle ◽  
Body Weight ◽  
Cardiac Muscle ◽  
Water Content ◽  
Skeletal Muscles ◽  
The Body ◽  
Continuous Exposure ◽  
Weight Changes ◽  
Body Weight Changes ◽  
Muscle Weight

Analyses were made of myoglobin content of rat skeletal and cardiac muscle following continuous exposure to simulated altitudes of 18,000 feet for a 2–10-week period. About five dozen rats were used. Acclimatization was associated with an increase in the myoglobin concentration of thigh, diaphragm, gastrocnemius and heart muscles. Total myoglobin content, however, increased during acclimatization in cardiac muscle but not in the three skeletal muscles. This finding together with the body weight changes and muscle weight changes suggested that the increases in myoglobin concentration of skeletal muscle may be merely a reflection of a decreased water content of muscles.

The relationship between cirral activity and oxygen uptake in Balanus balanoides

1965 ◽  
Vol 45 (2) ◽  
pp. 387-403 ◽  
Author(s):  
R. C. Newell ◽  
H. R. Northcroft
Keyword(s):  
Body Weight ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Mantle Cavity ◽  
The Body ◽  
Effect Of Temperature ◽  
Zero Rate ◽  
Rate Of Oxygen Consumption ◽  
The Relationship ◽  
Balanus Balanoides

The rate of cirral beat of Balanus balanoides is related to the logarithm of the body weight as an exponential function. In any one animal, there is little effect of temperature on cirral activity between 7·5° and 10° C. Between 10° and 20° C, however, there is a rapid increase in cirral beat with temperature followed by a fall at temperatures above 20° C.Balanus balanoides exhibits a fast, medium and zero rate of oxygen consumption. These rates of oxygen consumption correspond with (a) normal cirral beating, (b) ‘testing’ activity with no cirral movement, and (c) with the closure of the mantle cavity. Both of the possible levels of oxygen uptake are related to the logarithm of the body weight in a logarithmic fashion over the temperature range 7·5°–22·5° C. Temperature affects the two rates of oxygen consumption differently. In the slower rate (rate B) there is an increase in the rate of oxygen consumption between 7·5° and 14° C but there is no significant increase in the rate of oxygen consumption between 14° and 22·5 C°.

The influence of long-term melatonin administration on basic physiological and metabolic variables of young Wistar:Han rats

Biologia ◽  
2006 ◽  
Vol 61 (3) ◽  
Author(s):  
Monika Kassayová ◽  
Martina Marková ◽  
Bianka Bojková ◽  
Eva Adámeková ◽  
Peter Kubatka ◽  
...  
Keyword(s):  
Body Weight ◽  
Water Intake ◽  
Glucose Concentration ◽  
Tap Water ◽  
Serum Glucose ◽  
The Body ◽  
Male Rats ◽  
Epididymal Fat ◽  
Food And Water Intake

AbstractThe question of effects of long-term melatonin (MEL) administration have not yet been explained sufficiently, especially its metabolic consequences in young persons and animals. The aim of the present study was to analyze the effects of MEL given during prolonged time (for 3 months) and chronically (for 6 months) at the dose of 4 µg/mL of tap water, on the selected metabolic and hormonal parameters in young female and male Wistar:Han (WH) rats. The weights of selected organs, tissues, body weight gains and food and water intake were registered. Six weeks aged rats were adapted to standard housing conditions and light regimen L:D=12:12 h, fed standard laboratory diet and drank tap water (controls) or MEL solution ad libitum; finally they were sacrificed after overnight fasting. Prolonged MEL administration decreased serum glucose concentration and increased triacylglycerol and malondialdehyde concentration/content in the liver in females. In males MEL increased concentrations of serum phospholipids, corticosterone and liver malondialdehyde. MEL treatment reduced the body weight in both sexes and weight of epididymal fat in males, without any alterations of food and water intake. Chronic MEL administration reduced serum glucose concentration and increased concentration/content of glycogen, triacylglycerol and cholesterol in the liver and glycogen concentration/content in heart muscle in males. In females, the significant rise of serum corticosterone concentration and liver malondialdehyde content was recorded. MEL significantly increased liver weight and decreased thymus weight in males. MEL administration increased temporarily water intake in males, body and epididymal fat weights were similar to that in controls. Body weight of MEL drinking females was reduced in the 1st half of experiment only; the food and water intake did not differ from control group. The response in WH rats on MEL was more prominent as in the Sprague-Dawley strain (our previous studies). Male rats were generally more affected, probably due to higher daily and total consumption of melatonin.

The estimation of milk intake and growth of beef calves in the field by using tritiated water

1971 ◽  
Vol 22 (2) ◽  
pp. 291 ◽  
Author(s):  
NG Yates ◽  
WV Macfarlane ◽  
R Ellis
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Water Content ◽  
Water Intake ◽  
Body Weight Gain ◽  
Body Water ◽  
Milk Intake ◽  
The Other ◽  
Water Turnover ◽  
Significant Difference

The growth of Hereford, Friesian x Hereford, and Friesian x Shorthorn calves was studied under grazing conditions in the south-east of South Australia during the autumn period of minimal dry pasture. Measurements of body water content, water turnover, and body weight changes of calves were undertaken during an 8-week period after calving in February 1968. From these measurements, estimates were made of liveweight gain and the yield of body solids per unit of water turnover (milk intake). The subsequent development of the calves was also measured. The average birth weights of the three groups were not significantly different. The 8-week total of water intake (milk) was 405 � 14.3 1. in Shorthorn cross calves, 279 � 18.0 1. for Hereford cross, and 263 � 14.3 1. among the Herefords. Over the first 8 weeks body weight gain (g/24 hr) was highest in the Shorthorn cross calves and their body solids gain was 63 % greater than that of the Hereford cross calves but only 29 % greater than that of the Hereford calves. Water turnover (1.124 hr) of the Shorthorn cross calves was 45 % greater than that of the Hereford cross calves and 54% greater than that of the Hereford calves over the 8-week period. There was no significant difference between the three groups in body weight or solids gain per unit of milk intake (g/l), though the average conversion of milk to solids by Herefords was greater than that of the other breeds. The Shorthorn cows weighed less than the other groups after calving and their average relative and absolute loss of weight during lactation was greatest. The offspring of the Shorthorn cows had the highest water intake expressed as a function of the body weight0.75 of the cows. The water turnover of Shorthorn calves as a function of calf weight0.82 was also greater than that of the other calves. The correlations between body weight gain (g/24 hr) and water turnover (l./24 hr) and between body solids gain (g/24 hr) and water turnover (l./24 hr) were 0.815 (P < 0.001) and 0.632 (P < 0.01) respectively. The correlation between cow body weight loss and calf body weight gain was 0.481 (P < 0.05). A group of nine Friesian x Hereford calves studied for 11 weeks after calving in April 1969 on newly grown winter rainfall pasture 50 km north of Adelaide had both average water turnover (l./24 hr) and body weight gains (g/24 hr) substantially higher than those of any group in the previous year. The efficiency of conversion estimated as body solids gain and body weight gain per unit of water intake was, however, similar to those of the Hereford calves in 1968. The differences between the years are presumed to follow from differences in the amount of pasture available in the dry season, relative to pasture after the rains had come. Average body water content (TOH space) was 801 ml/kg body weight at the beginning of the measurements and gradually fell to 713 ml/kg at 11 weeks.

Water Content and Water Activity in the Cuticle of Terrestrial Isopods

1972 ◽  
Vol 56 (1) ◽  
pp. 49-55
Author(s):  
OSSI V. LINDQVIST ◽  
INGA SALMINEN ◽  
PAUL W. WINSTON
Keyword(s):  
Body Weight ◽  
Water Content ◽  
Water Activity ◽  
Equilibrium Points ◽  
The Body ◽  
Porcellio Scaber ◽  
Terrestrial Isopods ◽  
Osmotic Equilibrium ◽  
Significant Difference ◽  
The Difference

1. The water content of the cuticle of both desiccated and non-desiccated terrestrial isopods Porcellio scaber and Armadillidium vulgare was measured. The animals were desiccated for various times (up to 3 h) over silica gel and the mean water content of the cuticle was 54.0±0.78% for P. scaber and 52.7±1.11% for A. vulgare. There was no trend as regards the desiccation time, nor did the body weight affect the water content. 2. The water content of the cuticle remained virtually unchanged as long as the animal was alive in the desiccator. It dropped significantly after the animal had died after having lost some 30% of its body weight. 3. The cuticular water content of non-desiccated P. scaber tended to be slightly higher than that of desiccated ones. In A. vulgare no significant difference was observed between non-desiccated and desiccated specimens. 4. The water activity of the excised cuticle of the above two species and of Oniscus asellus and Cylisticus convexus was above that of the haemolymph and therefore not in osmotic equilibrium with it. The osmotic equilibrium points were below the osmotic pressures of the blood; the difference amounted from 1.5 to 2.8 atm. in different species. 5. The difference in water activity between blood and cuticle, the maintenance of water content with desiccation, and the drop in water level at death, all indicate the presence of an active mechanism regulating the cuticular water in terrestrial isopods.

Voluntary dehydration in man

1965 ◽  
Vol 20 (4) ◽  
pp. 719-724 ◽  
Author(s):  
John E. Greenleaf ◽  
Frederick Sargent
Keyword(s):  
Water Balance ◽  
Water Content ◽  
Water Deficit ◽  
Water Intake ◽  
Water Consumption ◽  
Water Loss ◽  
The Body ◽  
Osmotic Concentration ◽  
Voluntary Dehydration ◽  
Ad Libitum

The effects singly and in combination of heat, exercise, and hypohydration upon voluntary dehydration were studied in four acclimated, physically fit, young men. Voluntary dehydration is the delay in complete rehydration following water loss. Hypohydration refers to the state of decreased water content while the osmotic concentration of the body is maintained. Ad libitum drinking during the heat experiments was 146% greater than it was in the cool experiments. Hypohydration increased drinking 109% over the corresponding hydration experiment, exercise increased water intake 41% over resting. Hypohydration and exercise were less effective than heat in stimulating drinking. During the 4-hr experimental periods, the subjects did not or could not drink enough to compensate for the water lost. Regardless of the magnitude of the water deficit at the beginning of the recovery periods, the rates of rehydration were the same. The more stressful the experiment, the greater the water consumption and, in general, the longer it took to regain the lost water. water balance; heat; exercise; drinking; hypohydration Submitted on September 8, 1964

THE EFFECT OF ACUTE STARVATION ON THE BODY ORGANS OF THE ADULT WHITE RAT, WITH ESPECIAL REFERENCE TO THE ADRENAL GLANDS

1946 ◽  
Vol 24e (2) ◽  
pp. 37-48 ◽  
Author(s):  
A. T. Cameron ◽  
J. Carmichael
Keyword(s):  
Body Weight ◽  
Water Content ◽  
Pathological Process ◽  
Solid Content ◽  
The Body ◽  
Whole Body ◽  
Typical Behaviour ◽  
B Complex Vitamins ◽  
Increased Activity ◽  
Reticular Zone

When rats are starved by withholding all food, though giving water, they develop, two or threes days before death a typical behaviour syndrome, in winch at first there is increased activity, and subsequently, in old animals, marked immobility. At this pre-mortal stage in old animals, or the corresponding stage in younger rats, they have lost 30% or more of their body weight, and if they killed the adrenals are found to be enlarged and discoloured to a dark grey or dark dirty grey. These enlarged glands contain an increased amount of water though their solid content remains practically unaltered, the change representing an increase in the water content of the cells (possibly confined to the cortex). The glomerular zone is diminished in thickness, and the reticular zone also shows abnormality. Animals killed before they have lost 30% of their body weight still have normal adrenals (normal in size, weight, water content, and colour). The enlargement produced m the pre-mortal stage of inanition is a pathological process and is not a hypertrophy. Data in the literature suggest that certain types of adrenal enlargement such as that produced by deficiency of the B-complex vitamins may be similar in nature. The kidneys, heart, and gonads of acutely starved rats tend to lose weight more slowly than the whole body; the liver and spleen more rapidly; and the thyroid at about the same rate.

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