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| Titel: |
Tissues as receptors of photoperiodic monochromatic light and the regulation of serotonin metabolism |
| Auteur: |
Fowler, Dona J. DuBien, Janice L. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 13 (1982) nr. 2 pagina's 129-145 |
| Jaar: |
1982-05 |
| Inhoud: |
Photoperiods are recognized to induce a variety of physiological events in organisms, in particular, several daily or circadian rhythms. Hormones are secreted in daily rhythm patterns and provide regulation of other rhythmic physiological events. Serotonin is understood by several investigators to be a hormone that is produced in response to photoperiods, and its pattern of secretion is circadian in output, e.g. under long term tissue culture conditions (previous study). This study shows that monochromatic lights in photoperiods cause circadian outputs of serotonin. Yellow light (578 nm) produced the serotonin secretion pattern most nearly similar to white (control) light. The highest levels of serotonin were seen in the early evening which was maintained throughout the night. Each end of the visible spectrum produced the least overall amount of serotonin in time and the middle of the spectrum the greatest amount. Notable exceptions to this general trend were the effects of ultra violet and violet light, which produced overall amounts more similar to that seen in green and orange light. No monochromatic light produced the amount seen in the control light. This would lead to the conclusion that the tissue photoreceptors are probably not single molecules, but more probably exist as a system which utilizes a variety of light wavelengths to regulate circadian events. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 8 van 8 gevonden artikelen
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