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Titolo:
CELLULAR MECHANISMS OF CIRCADIAN SYSTEMS
Autore:
ROENNEBERG T; MERROW M; EISENSAMER B;
Indirizzi:
INST MED PSYCHOL,GOETHESTR 31 D-80336 MUNICH GERMANY
Titolo Testata:
Zoology
fascicolo: 4, volume: 100, anno: 1997,
pagine: 273 - 286
SICI:
0944-2006(1997)100:4<273:CMOCS>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
DINOFLAGELLATE GONYAULAX-POLYEDRA; LUCIFERIN-BINDING-PROTEIN; FAST-FREEZE FIXATION; GENE-EXPRESSION; MESSENGER-RNA; UNICELLULAR ALGA; NEUROSPORA-CRASSA; PHOTOSYNTHETIC APPARATUS; PHOTOTAXIS RHYTHM; PHASE RESPONSES;
Keywords:
DINOFLAGELLATES; TEMPORAL ECOLOGY; CIRCADIAN GENE EXPRESSION; CELL BIOLOGY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
156
Recensione:
Indirizzi per estratti:
Citazione:
T. Roenneberg et al., "CELLULAR MECHANISMS OF CIRCADIAN SYSTEMS", Zoology, 100(4), 1997, pp. 273-286

Abstract

The capability to generate a circa 24-h rhythmicity appears to be present in all micro-organisms, plants and animals. The mechanisms of these circadian oscillators are implemented at the cellular level, and feed-back loops have been described on the molecular level which may be responsible for the endogenous rhythmicity. However, the complexity ofa circadian system and its function within the ecological structure of an organism's temporal environment can only be appreciated and understood when all levels of biology, from molecules to behaviour, are investigated. This review summarizes the results of experiments with a unicellular marine alga, Gonyaulax polyedra, which has been a circadian model system for several decades. The circadian system of Gonyaulax consists of more than one oscillator. It can be influenced by light via two distinct input pathways. It can also be influenced by other, non-photic stimuli, e.g., limited resources such as nitrate. Both inputs and outputs of the system form complex feed-back loops with the oscillator. The complexity of the circadian system shows how difficult it may be to interpret experimental results on the molecular level, especially if the metabolic function of the involved elements is unknown. In view of our results in the marine unicell Gonyaulax and those in other circadian model systems, we propose an alternative hypothesis for the current molecular model of the circadian oscillator.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 00:56:54