Results 171 to 180 of about 34,337 (216)
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Efferent Signals of the Suprachiasmatic Nucleus
Journal of Biological Rhythms, 1993It is well established that the mammalian suprachiasmatic nucleus (SCN) is a biological pacemaker that entrains the activity of organisms to their environment and controls circadian rhyth-micity. However, neither the nature of these coupling signal or signals from the SCN, nor their target or targets in the brain, are well ...
R, Silver, J, LeSauter
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Identification of the suprachiasmatic nucleus in birds
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2001Circadian rhythms are generated by an internal biological clock. The suprachiasmatic nucleus (SCN) in the hypothalamus is known to be the dominant biological clock regulating circadian rhythms in mammals. In birds, two nuclei, the so-called medial SCN (mSCN) and the visual SCN (vSCN), have both been proposed to be the avian SCN. However, it remains an
T, Yoshimura +5 more
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2010
Diurnal variations in physiology and behavior are ubiquitous in higher organisms. Although some rhythms are driven directly by geophysical cycles of light or temperature, most are generated by internal timers, commonly referred to as biological clocks.
Gabriella Lundkvist, Gene D. Block
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Diurnal variations in physiology and behavior are ubiquitous in higher organisms. Although some rhythms are driven directly by geophysical cycles of light or temperature, most are generated by internal timers, commonly referred to as biological clocks.
Gabriella Lundkvist, Gene D. Block
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Functional Morphology of the Suprachiasmatic Nucleus
Frontiers in Neuroendocrinology, 1999In mammals, the biological clock (circadian oscillator) is situated in the suprachiasmatic nucleus (SCN), a small bilaterally paired structure just above the optic chiasm. Circadian rhythms of sleep-wakefulness and hormone release disappear when the SCN is destroyed, and transplantation of fetal or neonatal SCN into an arrhythmic host restores ...
Y, Ibata +11 more
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Neurogenesis of the hamster suprachiasmatic nucleus
Brain Research, 1990Neurogenesis of the hypothalamic suprachiasmatic nucleus (SCN) was described in the Syrian hamster (Mesocricetus auratus) using tritiated [3H]thymidine autoradiography. Pregnant hamsters were given single intraperitoneal injections of [3H]thymidine at different times during prenatal development, and labeled cells were analyzed in the offspring of 4-5 ...
F C, Davis, R, Boada, J, LeDeaux
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Brain Research Bulletin, 1993
Recovery of circadian drinking rhythms in suprachiasmatic nucleus (SCN)-lesioned rats after fetal SCN grafting was related to the immunocytochemical appearance and fiber outgrowth of vasopressin (VP)-, vasoactive intestinal polypeptide (VIP)-, and somatostatin (SOM)-containing neurons in the implants. At 4 weeks postgrafting, the first recovered animal
H A, Griffioen +4 more
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Recovery of circadian drinking rhythms in suprachiasmatic nucleus (SCN)-lesioned rats after fetal SCN grafting was related to the immunocytochemical appearance and fiber outgrowth of vasopressin (VP)-, vasoactive intestinal polypeptide (VIP)-, and somatostatin (SOM)-containing neurons in the implants. At 4 weeks postgrafting, the first recovered animal
H A, Griffioen +4 more
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Transplantation of the Suprachiasmatic Nucleus in the Rat
1987Restoration of the circadian rhythmicity in wheel-running activity was shown in rats with bilateral suprachiasmatic nuclei (SCN) lesions, after transplantation of the neonatal SCN into the wall of the third ventricle. Free-running circadian rhythms of the wheel-running activity were recorded in young adult rats at least for a month under constant dark ...
Y, Saitoh, I, Nihonmatsu, H, Kawamura
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Synaptology of the rat suprachiasmatic nucleus
Cell and Tissue Research, 1976Within the suprachiasmatic nucleus (SCN) of the rat the fine structure of the synapses and some features of their topological arrangement were studied. Five types of synapses could be distinguished with certainty: A. Two types of Gray-type-I (GTI) or asymmetrical synapses (approximately 33%).
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Resetting the suprachiasmatic nucleus clock
Frontiers in Bioscience, 2004Recent research on the cellular basis of circadian rhythmicity has stressed the importance of clock genes for the maintenance of normal rhythmicity. There have been tremendous advances in our understanding of the inter-relationships of the various genes known to generate the rhythms.
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Serotonin innervation of the primate suprachiasmatic nucleus
Brain Research, 2004The suprachiasmatic nucleus (SCN) in rodents receives a dense innervation from serotonin neurons of the midbrain raphe. This projection overlaps the terminal field of the retinohypothalamic tract in the SCN core, the central part of the nucleus characterized by a population of vasoactive intestinal polypeptide (VIP)-containing neurons.
Robert Y, Moore, Joan C, Speh
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