Ciba Foundation Symposium 183 - Circadian Clocks and their

Prestigious individuals describe the genetic, molecular, anatomical and neurochemical mechanisms and pathways that function to control and keep watch over circadian rhythmicity and functioning in organisms starting from unicellular algae to people. additionally considers the consequences of the fundamental and scientific learn for people.

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Exp Mycol 17:362-367 40 Rensing et al Gardner GF, Feldman J 1981 Temperature compensation of circadian period length in clock mutants of Neurosporu crussu. Plant Physiol 68:1244-1248 Gillette MU, Prosser RA 1988 Circadian rhythm of rat suprachiasmatic brain slice is rapidly reset by daytime application of cAMP analogs. Brain Res 474:348-353 Gooch V 1985 Effects of light and temperature steps on circadian rhythms of Neurosporu and Gonyuulux. In: Rensing L, Jaeger NI (eds) Temporal order. Springer-Verlag, Heidelberg, p 232-237 Hanson BA 1991 The effects of lithium on phosphoinositides and inositol phosphates of Neurosporu crussu.

One interpretation of these results is that the adaptation kinetics leading t o a decrease in the concentrations of the two messenger molecules may actually be the relevant advancing signal t o the circadian oscillator at this phase. Furthermore, ethanol caused similar phase advances at this circadian time and a decrease in the concentrations of the two second messengers on longer exposure. This would be in line with results of Techel et al(1990) showing phaseshifting effects of a cAMP antagonist and of calmodulin inhibitors (Nakashima 1986).

5 ) ; they also seem to involve changes in the phosphorylation state of transcription and translation factors such as eIF-2 (Murtha-Riel et a1 1993). The adaptation of Hsp synthesis is controlled by an autoregulatory system, possibly based on binding of Hsp7O to the heat-shock transcription factor (HSF; see Nover 1991). A rise in temperature from 25 to 42 "C also affects protein degradation: the activity of three proteases, of 130, 29 and 24 kDa, was considerably inhibited or blocked (Fig. 2b, C).

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