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New Findings Regarding Light Intensity and Its Effects as a Zeitgeber in the Sprague-Dawley Rat  (1993)
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In most mammals, the suprachiasmatic nucleus of the anterior hypothalamus has been implicated as the central driving mechanism of circadian rhythmicity. The photic input from the retina, via the retino-hypothalamic tract, and modulation from the pineal gland help regulate the clock. In this study, we investigated the effects of low light intensity on the circadian system of the Sprague-Dawley rat. A series of light intensity experiments were conducted to determine if a light level of 0.1 Lux will maintain entrained circadian rhythms of feeding, drinking, and locomotor activity.
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circadian rhythmicit, circadian rhythms, drinking, feeding, hypothalamus, Light Intensity, locomotor, pineal gland, Rat, retino-hypothalamic, Sprague-Dawley, suprachiasmatic nucl, Zeitgeber
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The Physiologist 36: (Suppl.): S 125 to S 126, 1993
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Curator: Phil So
NASA Official: Jessica Nowinski
Last Updated: August 15, 2019