Spectral aspects of Acetabularia's light transmission chronome - Effects of enucleation

John C. Woolum, Germaine G Cornelissen-Guillaume, Dora K. Hayes, Franz Halberg

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1 Scopus citations


Light transmission was studied at hourly intervals for 14 days on 2 intact and 4 rhizoidless (enucleated) cells first; 5 more intact and 2 rhizoidless cells were subsequently added with data covering 12 to 14 days. Each data series was analyzed by linear-nonlinear rhythmometry. On the average, enucleation was associated with a lengthening of the circadian period and a decrease in the circaseptan-to-circadian amplitude ratio. A shortening of the infradian period is also suggested. These results, originally reported for the first 6 series analyzed, are confirmed herein after the addition of 7 series from Acetabularia cells. A subtractive coupling between circadian and circaseptan components in the as-yet too-small sample remains to be further examined.

Original languageEnglish (US)
Pages (from-to)212-215
Number of pages4
JournalNeuroendocrinology Letters
Issue numberSUPPL. 1
StatePublished - Nov 25 2003


  • Acetabularia
  • Chloroplast migration
  • Chronome
  • Circadian
  • Circaseptan
  • Enucleation
  • Light transmission
  • Unicell


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