Acetabularia acetabulum: Unicellular model of neonatal vascular chronome

George Katinas, Sigrid Berger, Germaine G Cornelissen-Guillaume, Dewayne Hillman, John C. Woolum, Mark Engebretson, Elena V. Syutkina, Anatoly Masalov, Zhengrong Wang, Chaomin Wan, Earl E. Bakken, Othild Schwartzkopff, Franz Halberg

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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 languageEnglish (US)
Pages (from-to)201-207
Number of pages7
JournalNeuroendocrinology Letters
Issue numberSUPPL. 1
StatePublished - Nov 25 2003


  • Acetabularia
  • Chloroplast migration
  • Chronome
  • Circadecadal
  • Circadian
  • Circaseptan
  • Electrical potential
  • Oxygen production


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