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Biology 2019, 8(1), 15; https://doi.org/10.3390/biology8010015

Episodic Ultradian Events—Ultradian Rhythms

1
School of Human Sciences, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia
2
School of Agriculture and Environment and UWA Institute of Agriculture, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia
*
Author to whom correspondence should be addressed.
Received: 27 January 2019 / Revised: 24 February 2019 / Accepted: 9 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Biological Clocks)
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Abstract

In the fast lane of chronobiology, ultradian events are short-term rhythms that have been observed since the beginning of modern biology and were quantified about a century ago. They are ubiquitous in all biological systems and found in all organisms, from unicellular organisms to mammals, and from single cells to complex biological functions in multicellular animals. Since these events are aperiodic and last for a few minutes to a few hours, they are better classified as episodic ultradian events (EUEs). Their origin is unclear. However, they could have a molecular basis and could be controlled by hormonal inputs—in vertebrates, they originate from the activity of the central nervous system. EUEs are receiving increasing attention but their aperiodic nature requires specific sampling and analytic tools. While longer scale rhythms are adaptations to predictable changes in the environment, in theory, EUEs could contribute to adaptation by preparing organisms and biological functions for unpredictability. View Full-Text
Keywords: short-term rhythms; temperature; gene; central nervous system; methodology short-term rhythms; temperature; gene; central nervous system; methodology
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Goh, G.H.; Maloney, S.K.; Mark, P.J.; Blache, D. Episodic Ultradian Events—Ultradian Rhythms. Biology 2019, 8, 15.

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