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Statements

Subject Item
dbr:Bacterial_circadian_rhythm
rdfs:label
Bacterial circadian rhythm Rythme circadien bactérien
rdfs:comment
Les rythmes circadiens bactériens, comme d'autres rythmes circadiens sont endogènes. Récemment découverts, ils constituent une des manifestations de ce qu'on appelle horloge circadienne ou horloge biologique ou horloge interne. Bacterial circadian rhythms, like other circadian rhythms, are endogenous "biological clocks" that have the following three characteristics: (a) in constant conditions (i.e. constant temperature and either constant light {LL} or constant darkness {DD}) they oscillate with a period that is close to, but not exactly, 24 hours in duration, (b) this "free-running" rhythm is temperature compensated, and (c) the rhythm will entrain to an appropriate environmental cycle.
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dbc:Circadian_rhythm
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dbr:Melatonin dbr:Eukaryotic_cells dbr:Synechococcus dbr:Cyanobacteria dbr:Translation_(genetics) dbr:Bacterial_circadian_rhythms dbr:Bacillus_subtilis dbr:Eubacteria dbr:Bacteria dbr:Fitness_(biology) dbr:Promoter_(biology) dbr:Chronobiology dbr:Circadian_advantage n14:1tf7.jpg dbr:Luciferase dbr:Circadian_rhythm dbr:Transcription_(genetics) dbc:Circadian_rhythm dbr:Free-running_sleep dbr:Eukaryotes dbr:Histidine_kinase
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dbo:abstract
Les rythmes circadiens bactériens, comme d'autres rythmes circadiens sont endogènes. Récemment découverts, ils constituent une des manifestations de ce qu'on appelle horloge circadienne ou horloge biologique ou horloge interne. Bacterial circadian rhythms, like other circadian rhythms, are endogenous "biological clocks" that have the following three characteristics: (a) in constant conditions (i.e. constant temperature and either constant light {LL} or constant darkness {DD}) they oscillate with a period that is close to, but not exactly, 24 hours in duration, (b) this "free-running" rhythm is temperature compensated, and (c) the rhythm will entrain to an appropriate environmental cycle. Until the mid-1980s, it was thought that only eukaryotic cells had circadian rhythms. It is now known that cyanobacteria (a phylum of photosynthetic eubacteria) have well-documented circadian rhythms that meet all the criteria of bona fide circadian rhythms. In these bacteria, three key proteins whose structures have been determined can form a molecular clockwork that orchestrates global gene expression. This system enhances the fitness of cyanobacteria in rhythmic environments.
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