Ultradian Rhythms from Molecules to Mind: A New Vision of Life

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David Lloyd, Ernest Rossi
Springer Science & Business Media, Aug 27, 2008 - Science - 450 pages
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5. 1. 1 Biological Rhythms and Clocks From an evolutionary perspective, the adaptation of an organism’s behavior to its environment has depended on one of life’s fundamental traits: biological rhythm generation. In virtually all light-sensitive organisms from cyanobacteria to humans, biological clocks adapt cyclic physiology to geophysical time with time-keeping properties in the circadian (24 h), ultradian (24 h) domains (Edmunds, 1988; Lloyd, 1998; Lloyd et al. , 2001; Lloyd and Murray, 2006; Lloyd, 2007; Pittendrigh, 1993; Sweeney and Hastings, 1960) By definition, all rhythms exhibit regular periodicities since they constitute a mechanism of timing. Timing exerted by oscillatory mechanisms are found throughout the biological world and their periods span a wide range from milliseconds, as in the action potential of n- rons and the myocytes, to the slow evolutionary changes that require thousands of generations. In this context, to understand the synchronization of a population of coupled oscillators is an important problem for the dynamics of physiology in living systems (Aon et al. , 2007a, b; Kuramoto, 1984; Strogatz, 2003; Winfree, 1967). Circadian rhythms, the most intensively studied, are devoted to measuring daily 24 h cycles. A variety of physiological processes in a wide range of eukaryotic organisms display circadian rhythmicity which is characterized by the following major properties (Anderson et al. , 1985; Edmunds, 1988): (i) stable, autonomous (self-sustaining) oscillations having a free-running period under constant envir- mental conditions of ca.

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The Ultradian Clock 40min in Yeast Saccharomyces cerevisiae
ENOX Proteins Copper HexahydrateBased Ultradian Oscillators of the Cells Biological Clock
SelfOrganized Intracellular Ultradian Rhythms Provide Direct CellCell Communication
Phosphorylation Dynamics in Mammalian Cells
Is There a Mitochondrial Clock?
Invertebrate Systems
Ultradian and Circadian Rhythms Experiments and Models
Ultradian Lovesong Rhythms in Drosophila
Ultradian Rhythms as the Dynamic Signature of Life
The Mammalian Circadian Timekeeping System
Ultradian and Circadian Rhythms in Human Experience
Ultradian Cognitive Performance Rhythms During Sleep Deprivation
High Frequency EEG and Its Relationship to Cognitive Function
Total Sleep Deprivation and Cognitive Performance The Case for Multiple Sources of Variance
Open Questions on Mind Genes Consciousness and Behavior The Circadian and Ultradian Rhythms of Art Beauty and Truth in Creativity
Genes Sleep and Dreams

Midrange Ultradian Rhythms in Drosophila and the Circadian Clock Problem
Tidal Rhythms
The Neuroendocrineal and Developmental Level
Pulsatile Hormone Secretion Mechanisms Significance and Evaluation
Epilogue A New Vision of Life

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About the author (2008)

David Lloyd, born in Dublin, is a writer and critic living in Los Angeles, California. ARC & SILL collects his five previous books of poetry: Taropatch (Oakland: Jimmy's House of Knowledge, 1985), Coupures (Dublin: hardPressed Poetry, 1987), Change of State (Berkeley: Cusp Books, 1993), Sill (Los Angeles: Cusp Books, 2006), and Vega (Los Angeles: Mind Made Books, 2009). As a critic, he works on Irish literature and culture and on poetry and aesthetics. His most recent critical book is Irish Culture and Colonial Modernity, 1800-2000: The Transformation of Oral Space (Cambridge University Press, 2011). He is also the editor of Cusp Books, a chapbook press based in Los Angeles.

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