Appendix

Glossary

Acrophase

Phase angle corresponding to the maximal value of the rhythmic parameter studied

Circadian

Period of oscillation is 24 ± 4 hours

Cosinor-analysis

Nonlinear regression procedure (applying a parameterised cosinus equation to the raw data series)

Degree of Functional Coupling

Percentage of the circadian component and harmonic ultradian components in relation to all significant rhythmic components of a spectrum based on the respective relative parts of their assigned variance

Harmonic periods

Period lengths are integer dividers of 24 h

Harmonic portion

Percentage of the number of the circadian and their harmonic ultradian components in relation to the number of all significant periods smaller or equal to the circadian rhythm

Infradian

Period length of oscillation is more than 28 hours

MESOR

Mean of oscillation of cosinor analysis

Motility

Swimming velocity in video-pixels per second

Number of turns

Number of changes of the direction per second

Phase-shift

Displacement of an oscillation along the time axis

Polar Plots

Graphical presentation of amplitude and acrophase

Power spectral analysis

Fourier transformed autocorrelation function for quantification of the harmonic frequency structure of activity rhythms

Ultradian

Period length of oscillation is less than 20 hours

Zeitgeber (time trigger )

Forcing oscillation which entrains a biological rhythm


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