Time structures (chronomes) of Acetabularia acetabulum, a unicellular alga, are mapped. For oxygen production, basal and apical chloroplast migration and the electrical potential of this giant unicell, about 24-hour cycles, circadians, and about 7-day cycles, circaseptans, are found upon release into continuous light (LL), after prior exposure (synchronization) for up to a week or for longer spans with a regimen of 12-hourly alternating spans of light and darkness (LD12:12). For the electrical potential in LL, the circaseptan amplitude is larger than the circadian one. Also mapped is an about 10-year (circadecadal) cycle of the alga in LD12:12 for the circadian amplitude and circadian phase of oxygen production. Acetabularia is a laboratory model, whose chronomes share with the neonatal human chronomes of blood pressure and heart rate a prominent circaseptan variation resonating with the environment and a circadecadal modulation also observed for the case of neonatal blood pressure, representing perhaps common aspects of growth.
|Original language||English (US)|
|Number of pages||7|
|Issue number||SUPPL. 1|
|State||Published - Nov 25 2003|
- Chloroplast migration
- Electrical potential
- Oxygen production