Figure 40

Larger about-weekly than about-daily cycle in electrical potential of a unicellular alga (Acetabularia Acetabulum evolved 500 million years ago). Nonlinear spectral analysis on signal averaged data from 20 single cells, released (zero time) into continuous light (LL), after prior standardization in light and darkness alternating at 12-hour intervals (LD12:12) for up to one week. Total number of observations: 38,578; experimental span: 376 days. Note a more prominent amplitude (A) for a component with a period near a week thanks the As of the about daily and about half-weekly components (all free-running). The circaseptan A is equated to 100 and the other As are expressed as percentage of the circaseptan. Meta-analyzed data of Dr Sigrid Berger, Dr Lübbo von Lindern and the late Dr Hans-Georg Schweiger. The about-7-day (circaseptan) component is more prominent than the circadian rhythm in the electrical potential of a eukaryotic unicell released into continuous light after prior exposure to a light-dark schedule alternating at 12-hour intervals [187]. Models such as Acetabularia may help to better understand circaseptan and circadecadal components (both demonstrated for Acetabularia) and still broader chronome organization. Along with even older cyanobacteria that also show circaseptans [15], Acetabularia may serve to explore the origins of life, another topic of inquiry into the chronomes of our evolution and even into the chronomes of our cosmoi in the broadest sense for which organisms can serve as transdisciplinary radiation detectors. Acetabularia [292], like air bacteria and staphylococci [293], also serves as a laboratory model for circadecadal rhythms.