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| Titel: |
Influence d'eclairements brefs, a differentes longeurs d'onde, sur les variations circadiennes des activites enzymatiques digestives chez Palaemon serratus (Crustacea, Natantia) |
| Auteur: |
Van Wormhoudt, A. Malcoste, R. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 7 (1976) nr. 2 pagina's 101-111 |
| Jaar: |
1976-06 |
| Inhoud: |
The Influence of Short Periods of Lighting with Different Wavelengths on the Orcadian Changes of the Enzymatic Digestive Activities in Palaemon serratus (Crustacea, Natantia) The effect of light on the circadian rhythms of digestive activities in the Shrimp Palaemon serratus have been studied. Continuous darkness leads in a few days to a disappearance of the variations of the circadian rhythms of digestive enzymes while these rhythms go on in continuous light. Short (1 or 2 hrs) and low intensity flashes of white light are effective in bringing on the reappearance of rhythmic variations in darkness. We have been able to establish an isoquantic spectrum of action of the light. Two values of wavelength appears to account for a maximum sensibility of the shrimp: one in ultraviolet light and an other one, more important, in the green (λ=544 nm). In green light it is possible to obtain the same effect of light by decreasing the time of stimulation to 5 or 10 mn and in increasing the total quantity of energy. Significant responses are obtained with total energy greater than 10000 pE. cm-2. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 8 gevonden artikelen
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