title: [The nature of the circahoralian (ultradian) intracellular rhythms. Similarity to fractals].
abstract: The properties and possible origin of circahoralian intracellular rhythms are discussed. Irregularity of these oscillations, as expressed in different time scales, determination, and resistance to external influences, including changes in the environmental temperature, are noted. No pacemaker of circahoralian rhythms was found. These specific features and analysis of the structure of circahoralian rhythms (Herst equation) suggest their similarity to fractals, chaotic but determined forms with a certain internal structure. Determination of circahoralian rhythms in a cell-free system and their possible fractal nature characterizes the rhythms as an imminent property of the cytoplasm, that does not require special regulation. Modulations of the frequency and amplitude of oscillation under the influence of external influences are described. It is proposed that the circahoralian rhythms are a protective factor for the cell and organ functions and a mechanism of adaptations under varying life conditions.
authors.affiliation: Kol'tsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: V Ia
authors.initials: VIa
authors.lastname: Brodskiĭ
mesh_terms: D000204:Activity Cycles / Q000502:physiology*; D000818:Animals; D002450:Cell Communication; D002468:Cell Physiological Phenomena; D017709:Fractals
vernacular_title: O prirode okolochasovykh (ul'tradiannykh) vnutrikletochnykh ritmov. Skhodstvo s fraktalami.