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Some perturbations that disturb the circadian melatonin rhythm


, : Some perturbations that disturb the circadian melatonin rhythm. Chronobiology International 9(4): 314-321

The circadian melatonin rhythm is highly reproducible and generally not easily altered. The few perturbations that are capable of significantly changing either the amplitude or the pattern of the 24-h melatonin rhythm are summarized herein. Aging alters cyclic melatonin production by decreasing the amplitude of the nocturnal melatonin peak in all species in which it has been studied. The best known acute suppressor of nocturnal melatonin is light exposure. The brightness of light required to acutely depress pineal melatonin production is species dependent; of the visible wavelengths, those in the blue range (approximately 500-520 nm) seem most effective in suppressing melatonin production. Nonvisible, nonionizing radiation in the extremely low frequency range (e.g., 60 Hz) seems also capable of altering pineal melatonin synthesis. Hormones have relatively little influence on the circadian production of melatonin, although either adrenalectomy or hypophysectomy does attenuate the amplitude of the melatonin cycle. Exercise at the time of high melatonin production rapidly depresses pineal concentrations of the indole without influencing its synthesis; the mechanism of this suppression remains unknown.

US$19.90

PMID: 1423740

DOI: 10.3109/07420529209064541


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Bhaumik, U.; Ghosh, A.; Chatterjee, B.; Sengupta, P.; Darbar, S.; Roy, B.; Nandi, U.; Pal, T.K., 2009: Development and validation of a high-performance liquid chromatographic method for bioanalytical application with rimonabant. A simple and feasible high-performance liquid chromatographic method with UV detection was developed and validated for the quantification of rimonabant in human plasma. The chromatographic separation was carried out in a Hypersil BDS, C(18) column...

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Hass, G.C.; Bonamassa, F.; Newmark, P.; Kayne, N., 1967: The influence of vehicle operating variables on exhaust emissions. This paper is a report of the operating variables and emissions characteristics of a 1964 283 cubic inch V-8 Chevrolet automobile. This vehicle was used as a laboratory tool in a project to develop an improved driving cycle to represent Los Angele...

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Nikitina G.V.; Savchenko O.N.; Stepanov M.G., 1987: Hormonal properties of new derivatives of 17 alpha oxyprogesterone. Problemy Endokria 33(3): 60-63

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