[Physical time and personal biological time in gerontologic research].
Beside the reversible t-time of physics is introduced an irreversible logarithmical tau-time as a second time. This time is determined by growth, vitality, and reliability of an organism. Using the tau-time it is possible to divide the lifespan of an organism into four parts. Each segment is of approximately the same duration, namely a quarter of the lifespan. There is an analogy between tau-time and physical entropy.
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D000368:Aged; D000375:Aging / Q000502:physiology*; D001683:Biological Clocks; D006305:Health Status Indicators; D006306:Health Surveys; D006801:Humans; D008136:Longevity; D008433:Mathematics; D055585:Physical Phenomena; D010825:Physics; D012106:Research; D013995:Time
Physikalische Zeit und biologische Eigenzeit in der gerontologischen Forschung.