Journal ArticleDOI
The pineal gland of the mole (Talpa europaea L.) II. Ultrastructural variations observed in the pinealocytes during different parts of the sexual cycle
P. Pevet,A. R. Smith +1 more
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Changes of some ultrastructural parameters in mole pinealocytes were quantitatively studied during the various phases of the sexual cycle and seem to demonstrate close relationship between the endocrine activity of the hypophyseo-gonadal axis and the synthesis of some compounds by the pinealocyte.Abstract:
Changes of some ultrastructural parameters (paracrystalline structures, Golgi apparatus, secretory granules) in mole pinealocytes were quantitatively studied during the various phases of the sexual cycle An increase in quantity of paracrystalline structures and of the Golgi apparatuses was demonstrated during the period of high sexual activity in male pinealocytes and during oestrus, gestation and lactation in female pinealocytes Moreover, the appearance of vacuoles in female pinealocytes was observed during pro-oestrus These results seem to demonstrate close relationship between the endocrine activity of the hypophyseo-gonadal axis and the synthesis of some compounds by the pinealocytes No increase in the quantity of secretory granules was observed during the various phases of the sexual cycle studiedread more
Citations
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Journal ArticleDOI
Generation of the Melatonin Endocrine Message in Mammals: A Review of the Complex Regulation of Melatonin Synthesis by Norepinephrine, Peptides, and Other Pineal Transmitters
TL;DR: The aim of this review is to gather together early and recent data on the effects of the nonadrenergic transmitters on modulation of melatonin synthesis, which reveals the variety of inputs that can be integrated by the pineal gland; what elements are crucial to deliver the very precise timing information to the organism.
Book ChapterDOI
Secretory processes in the mammalian pinealocyte under natural and experimental conditions.
TL;DR: In the light of the different concepts treated, the confused state of comprehension of pineal functions becomes more understandable and most of the paradoxical and contradictory facts related to pineal function become less confusing.
Journal ArticleDOI
On the presence of different populations of pinealocytes in the mammalian pineal gland.
TL;DR: The different categories of cells described by many authors in the pineal gland of mammals have been critically considered and secretory processes present in some mammalian species, including the mole, the hedgehog, and the rat, are considered.
Journal ArticleDOI
Circadian and circannual fluctuations of pineal indoleamines (serotonin and melatonin) in Testudo hermanni Gmelin (Reptilia, Chelonia). I. Under natural conditions of photoperiod and temperature.
TL;DR: Tortoise pineal serotonin and melatonin levels show marked circadian and circannual rhythms in a natural environment and the physiological significance of these rhythms remains to be determined and needs further investigation.
References
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Journal ArticleDOI
THE USE OF LEAD CITRATE AT HIGH pH AS AN ELECTRON-OPAQUE STAIN IN ELECTRON MICROSCOPY
TL;DR: The stain reported here differs from previous alkaline lead stains in that the chelating agent, citrate, is in sufficient excess to sequester all lead present, and is less likely to contaminate sections.
Journal ArticleDOI
A simplified lead citrate stain for use in electron microscopy.
TL;DR: This communication reports the use of a commercially available lead citratO to eliminate the lead citrate stain in electron microscopy.
Journal ArticleDOI
Araldite as an Embedding Medium for Electron Microscopy
Audrey M. Glauert,R. H. Glauert +1 more
TL;DR: A mixture of araldite epoxy resins has been developed which is soluble in ethanol, and which yields a block of the required hardness for thin sectioning, which improves the preservation of the fine structure of a variety of specimens.
Journal ArticleDOI
Pineal Control of a Seasonal Reproductive Rhythm in Male Golden Hamsters Exposed to Natural Daylight and Temperature
TL;DR: Results indicate that the neuroendocrine— gonadal axis may normally be refractory to pineal secretory products during the summer months or the pineal gland may be physiologically “exhausted” after a period of activity.
Journal ArticleDOI
Pineal function in long term blinded male and female golden hamsters.
TL;DR: Removal of the eyes from either adult male or female golden hamsters causes the reproductive organs to involute within 9 weeks, and if hamsters are maintained for 27 weeks after blinding, the gonads regenerate to an adult condition even though the pineal gland is intact.