Journal ArticleDOI
Cytological studies of the pineal in relation to the annual cycles in the testis and climatological variables of free‐living roseringed parakeets (Psittacula krameri)
Saumen Kumar Maitra,Mamata Dey +1 more
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TLDR
Cytological studies of the pineal and the testes in free‐living roseringed parakeets show that the activities of both organs undergo definite annual changes.Abstract:
Cytological studies of the pineal and the testes in free‐living roseringed parakeets (Psittacula krameri) show that the activities of both organs undergo definite annual changes. The features of hyperactivity of pinealocytes were noted during the months of April through September, after which a gradual loss of the signs of cellular activity occurred till March, when the pineal appeared to be highly regressed, followed by an abrupt change in the opposite direction in April to repeat the cycle. On the other hand, studies of the testes indicated that the species attains maximum testicular maturation during March, after which sudden regression occurs and the testes remain in the quiescent state till September when recovery of spermatogenesis takes place and steady growth and development towards the annual peak follow. A significant negative correlation was found between the seasonal values for nuclear diameter of the pinealocytes and each of the studied parameters of testes. Among the considered clim...read more
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Journal ArticleDOI
Seasonal changes in adrenal and gonadal activity in the quail, Perdicula asiatica: involvement of the pineal gland
TL;DR: It is indicated that changes in environmental factors promote annual variations in adrenal and gonadal activity probably by modulating the pineal gland.
Journal ArticleDOI
The morpho-anatomy and histology of the pineal complex in a major Indian carp, Catla catla: identification of the pineal photoreceptor cells and their responsiveness to constant light and constant darkness during different phases of the annual reproductive cycle.
TL;DR: The apparent lack of any cellular responses either in the PS, or in the DS, following exposure to LL and DD, suggests that in C. catla the photoreceptor cells are located only within the epithelial lining of the EV and that these cells respond in a manner similar to mammalian pinealocytes when subjected to comparable photoperiod‐induced experimental conditions.
Journal ArticleDOI
The Structure of the Pineal Complex in a Common Indian Teleost, Catla catla: Evidence for Pineal‐Induced Inhibition of Testicular Function Within an Annual Reproductive Cycle
TL;DR: It was noted that both the nuclear diameter and the apical cytoplasmic projections of the EV photoreceptor cells showed a significant reduction, thus suggesting a reduced synthetic activity, during the month of July, the spawning phase of the reproductive cycle.
Journal ArticleDOI
Photoperiod, indoleamines, and ovarian responses in the Indian tropical jungle bush quail Perdicula asiatica
Chandana Haldar,A. Rai +1 more
Journal ArticleDOI
Comparative view of pineal gland morphology of nocturnal and diurnal birds of tropical origin.
Chandana Haldar,K. S. Bishnupuri +1 more
TL;DR: Detailed light and electron microscopic studies of the pineal gland from these tropical birds revealed the presence of a well‐developed, functionally active gland in nocturnal birds (contrary to reports available until now), and suggests more heterogenicity in pineal glands morphology (cellular architecture) among diurnal birds than theNocturnal one.
References
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Journal ArticleDOI
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TL;DR: Histopathologies technic and practical histochemistry, Histopathologie techno-practical histochemistry and the role of nanofiltration in medicine and drug discovery and abuse are studied.
Journal ArticleDOI
The melatonin message: duration versus coincidence hypotheses.
TL;DR: It may be that organisms use a combination of absolute duration of themelatonin pulse, direction of change of the melatonin rhythm, and synchrony of peak melatonin with the increased sensitivity of the end organ before a response is forthcoming.
Journal ArticleDOI
Pineal Function in Sparrows: Circadian Rhythms and Body Temperature
TL;DR: Deep body temperature of the house sparrow, Passer domesticus, was monitored continuously by radio telemetry and pinealectomy abolished the normal circadian rhythm of body temperature in constant darkness, and significantly altered the amplitude of bodyTemperature rhythms entrained to light cycles.
Journal ArticleDOI
The role of the pineal gland in the photoperiodic control of reproduction in different hamster species.
TL;DR: Melatonin one of the 5-methoxyindoles rhythmically synthesized in the Pineal gland, appears to be the pineal hormone conveying the photoperiodic message.
Book ChapterDOI
Histological structure and cytology of the pineal organ in birds and mammals.
TL;DR: The findings that are functionally suggestive and those that are important in the design and interpretation of experiments purporting to demonstrate pineal function or activity are discussed in the chapter.
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Annual pineal and testicular cycle in the Indian jungle bush quail, Perdicula asiatica, with reference to the effect of pinealectomy.
Chandana Haldar,M. Ghosh +1 more