Browsing by Author "J.P. Thapliyal"

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Adrenal hormones and oxidative metabolism of the garden lizard (Calotes versicolor)
(1983) B.B. Gupta Pd.; J.P. Thapliyal
Daily administration of adrenaline over a 10-day period invariably induced significant increases in the metabolic rate of the whole body and of specific tissue (liver, muscle, kidney and brain) of both intact and thyroidectomized lizards except during June (breeding season) when the presence of thyroid hormones was a prerequisite for the stimulation of oxygen consumption by the whole body, muscle, kidney and brain but not by the liver. Corticosterone had no effect on whole body oxygen consumption but stimulated, inhibited or was without influence on the oxygen consumption of individual tissues, depending on the season the presence or absence of thyroid hormones. It is suggested that adrenaline, due to its temperature-independent calorigenic effect, acts as the emergency hormone for energy release and helps the animal to survive during hibernation (winter months) when almost all the endocrine glands are inactive.
Agonadal garden lizard:Calotes versicolor
(Springer-Verlag, 1966) B.J. Choubey; J.P. Thapliyal
[No abstract available]
Annual variation and role of male hormone in the renal β-glucuronidase activity of the chequered water snake, Natrix piscator
(1977) S.C. Gupta; R.K. Garg; J.P. Thapliyal
In a local water snake, Natrix piscator, the effects of castration and testosterone on kidney weight, renal β-glucuronidase (lysosomal enzyme) and height of the cells lining the sexual segment were studied. Renal β-glucuronidase activity was high in the progressive and peak phases of the testis while the weight of the kidney was high during the regressive phase. Castration decreased renal β-glucuronidase activity, height of the cells lining the sexual segment and weight of the kidney. Testosterone increased the activity of the enzyme and height of the cells lining the sexual segment of castrated snakes. Kidney weight in castrated snakes was not affected by testosterone administration. © 1977.
Annual variation in the oxygen utilisation dynamics of the garden lizard, Calotes versicolor
(1986) B.B.P. Gupta; J.P. Thapliyal
Energy requirement of Calotes versicolor, as judged by the rate of oxygen consumption by whole body, liver and muscle, was recorded to be minimum during hibernation (quiescent phase) and maximum during breeding phase. Kidney metabolic rate was comparatively high during hibernation and post-hibernation. Statistically significant circannual rhythms were detected in the rate of oxygen consumption of whole body, liver, muscle and kidney but not in that of brain. However, significant but transient increase in the rate of brain oxygen uptake was recorded during February (arousal), May (initiation of breeding) and November (entry into hibernation). It seems that the annual changes in metabolic rate are reflections of energy requirements of the lizard and its tissues during different phases of the annual activity cycle. Further, climatic factors seem to affect the oxidative metabolism of Calotes acting through the endocrine glands. © 1986 Indian Academy of Sciences.
Changes of glucose metabolism after thyroidectomy in chequered water snake (Natrix piscator)
(1975) J.P. Thapliyal; S.C. Gupta; R.K. Garg
In reptiles, thyroid activity is low during winter and high during summer months. The rate of carbohydrate metabolism also varies according to the season. While it is known that thyroid influences oxidative metabolism, so far no attempt has been made to study its role in carbohydrate metabolism of reptiles. This report describes the effect of thyroidectomy on the rate of glucose removal from plasma of the chequered water snake, Natrix piscator. It is a non poisonous snake available throughout the year. Testis and sexual segment of the kidney exhibit annual cyclic changes in size and activity. The gonads are large from September to December and small in size from March to June. During spring and summer the level of glucose in blood is high and that of glycogen in liver is low.
Chronohaematological changes in the lizard Calotes versicolor after pinealectomy
(1981) C. Haldar; J.P. Thapliyal
[No abstract available]
Comparison of the effects of chemical, surgical, and radiothyroidectomy in Spotted Munia, Lonchura punctulata
(1974) Asha Chandola; J.P. Thapliyal
Surgical and radiothyroidectomy suppressed feather regeneration and increased the weight of the body, liver, gonads, and gonoducts in Spotted Munia. Chemical thyroidectomy (methylthiouracil) differed only in not being able to affect gonad and gonoduct weight, probably because of incomplete impairment of thyroid function. © 1974.
Development of pineal complex in Calotes versicolor
(1977) C. Haldar; J.P. Thapliyal
[No abstract available]
Effect of adrenaline and nor-adrenaline on the oxidative metabolism of the Indian garden lizard Calotes versicolor
(1985) B.B.P. Gupta; J.P. Thapliyal
[No abstract available]
Effect of castration and of male hormone administration on the tissue respiration and thyroid activity of the checkered water snake, Natrix piscator
(1974) J.P. Thapliyal; D.Suresh Kumar; R.K. Garg
Castration lowered and male hormone treatment increased oxygen uptake of liver and skeletal muscle of the checkered water snake, Natrix piscator, without affecting thyroidal uptake of 131I. © 1974.
Effect of estrogen and gonadotropic hormones on the plumage pigmentation in Lal Munia (Estrilda amandava)
(Springer-Verlag, 1963) J.P. Thapliyal; P.D. Tewary
[No abstract available]
Effect of melatonin on gonads, body weight, and luteinizing hormone (LH) dependent coloration of the Indian finch, Lal munia (Estrilda amandava)
(1987) B.B.P. Gupta; C. Haldar-Misra; M. Ghosh; J.P. Thapliyal
Four doses of melatonin were administered intramuscularly over 30 days in separate groups of intact adult male Lal munia, Estrilda amandava, during mid-day (1300 hr) and mid-night (0100 hr) in separate sets during the month of August (late progressive phase), and their effects were studied on the body weight, gonadal and thyroidal activities, and luteinizing hormone (LH)-dependent plumage and beak pigmentation. Melatonin, irrespective of its dose and the time of administration, invariably induced complete inhibition of seasonal gonadal growth and activity, and also the LH-dependent plumage pigmentation. Melatonin had no effect on LH-dependent beak coloration. The inhibitory effect of melatonin on the body weight growth was found to be dependent on the time of administration and the dose of the hormone. Melatonin inhibited the thyroid activity in all the groups. These findings seem to suggest that while melatonin influences gonadal activity, body weight growth, and thyroid activity by acting directly at the hypothalamo-hypophyseal complex, it counteracts the effect of LH at the feather papillae level. Further, synthesis and/or release of FSH seems to be more sensitive to melatonin than that of LH. However, the metabolic action of melatonin might be species specific. © 1987.
Effect of photoperiod on thyroid function of spotted munia, Lonchura punctulata
(1973) Asha Chandola; J.P. Thapliyal
Long day length ( 15 L 9D) stimulated thyroid function in juvenile (spring) and adult (autumn) Spotted Munia but was without effect on the gonad and gonoduct weight. © 1973.
Effect of pinealectomy on the annual testicular cycle of Calotes versicolor
(1977) C. Haldar; J.P. Thapliyal
Pinealectomy resulted in an earlier recrudescence and a later regression of the annual gonadal cycle of the lizard Calotes versicolor. Spermatozoa appeared early and were present throughout the course of the experiment, namely, for 11 months. In control lizards (sham-operated, intact), on the other hand, spermatozoa appeared in late April and were observed only until August, a period of 5 months. The sex segments of the kidneys showed a cycle similar to the cycle of the testes in both groups. © 1977.
Effect of pinealectomy on the photoperiodic gonadal response of the Indian garden lizard, Calotes versicolor
(1979) J.P. Thapliyal; C.Misra nee Haldar
Pinealectomy during early summer partially, but significantly, inhibits the decrease in the gonad size of lizards subjected to short photoperiods. During early winter, it significantly accelerates the growth of the testes in animals subjected to constant long photoperiods. It is proposed that the pineal, as in mammals and some birds, probably acts by way of the neuroendocrine complex. © 1979.
Effect of thyroidectomy upon the testes of Indian spotted munia;Uroloncha punctulata
(Springer-Verlag, 1964) S.K. Pandha; J.P. Thapliyal
[No abstract available]
Effect of thyroidectomy, l-thyroxine and temperature on hemopoiesis in the chequered water snake, Natrix piscator
(1976) J.P. Thapliyal; R.J. Kaur
Thyroidectomy in Natrix piscator at 30° produced a significant decrease in the total number of red blood cells (RBC), hemoglobin concentration, and hematocrit and an increase in white blood cells (WBC). By Day 45 postthyroidectomy, the number of WBC decreased to the prethyroidectomy level; l-Thyroxine suppressed the effects produced by thyroidectomy. At 16° thyroidectomy and l-thyroxine produced no effect on the blood picture, but in intact snakes RBC number, hemoglobin concentration and hematocrit decreased and the number of white blood cells increased significantly. © 1976.
Effect of thyroxin on the gonad and body weight of Spotted Munia, Uroloncha punctulata
(1968) J.P. Thapliyal; R.K. Garg; S.K. Pandha
Low doses of l‐thyroxin promote feather regeneration and lead to significant reduction in the mean weight of the gonad of adult normal and thyroidectomized Spotted Munia, Uroloncha punctulata, in the breeding phase. At moderately high doses of thyroxin complete molting occurs, and the mean weight of the gonoduct is also significantly reduced. The effect of l‐thyroxin increases as the duration of administration is increased. There is practically no difference between the response of normal and thyroidless birds. It is suggested that whereas the effects of l‐thyroxin on the plumage are by way of body metabolism, those on the gonad, gonoduct and body weight are due to a direct influence on the output of the gonad‐stimulating and growth‐promoting hormones from the adenohypophysis. Copyright © 1968 Wiley‐Liss, Inc., A Wiley Company
Effects of L-thyroxine on the intermediary metabolism of the Spotted Munia, Lonchura punctulata
(1975) J.P. Thapliyal; R.K. Garg; G.S.R.C. Murty; S.C. Gupta
L-Thyroxine was injected over a period of 1 mo into Spotted Munia, Lonchura punctulata, and the following variables were measured: glucose and protein in the plasma, glycogen in the muscle and liver, cholesterol and fatty acid esters in the liver, and plasma, and free fatty acids and triglycerides in the liver, plasma, and adipose tissue. The hormone had different effects at different dose levels on the plasma proteins, liver free fatty acids, and plasma and liver fatty acid esters. It caused significant decrease in hepatic glycogen and triglycerides and significant increase in the plasma and adipose tissue free fatty acids. Low and high doses decreased significantly plasma triglycerides and muscle glycogen, respectively, and the mid dose decreased plasma glucose and adipose triglycerides. Hepatic and plasma cholesterol was not affected significantly. © 1975.
Effects of orchidectomy and male hormone administration on the adrenal of common myna, Acridotheres tristis
(1978) C.M. Chaturvedi; J.P. Thapliyal
[No abstract available]