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. 1986 Nov;83(22):8619–8623. doi: 10.1073/pnas.83.22.8619

Evidence for a circaseptan and a circasemiseptan growth response to light/dark cycle shifts in nucleated and enucleated Acetabularia cells, respectively.

H G Schweiger, S Berger, H Kretschmer, H Mörler, E Halberg, R B Sothern, F Halberg
PMCID: PMC386982  PMID: 3464973

Abstract

Nucleated as well as enucleated Acetabularia mediterranea cells were subjected to 14 different patterns of shifts in a regimen of 12 hr of light alternating with 12 hr of darkness in four 30-day long experiments. With one exception, which might be due to a circannual modulation, these experiments showed that nucleated cells had maximal growth rates when a shift was performed every 7th or 15th day. In enucleated cells, maxima were observed on shift schedules that were about 3-4 days rather than about 7 days apart. The results indicate that in the unicellular green alga Acetabularia a rhythm of about 7 days (circaseptan) exists and that removal of the nucleus results in a circaseptan frequency multiplication.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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