Download PDF by Giuseppe Longo, Maël Montévil: Perspectives on Organisms: Biological time, Symmetries and

By Giuseppe Longo, Maël Montévil

ISBN-10: 364235937X

ISBN-13: 9783642359378

ISBN-10: 3642359388

ISBN-13: 9783642359385

This authored monograph introduces a really theoretical method of biology. start line is the research of empirical organic scaling together with their variability, that's present in the literature, e.g. allometric relationships, fractals, and so on. The e-book then analyzes various facets of organic time: first, a supplementary temporal measurement to deal with right organic rhythms; secondly, the strategies of protension and retention as a method of neighborhood association of time in dwelling organisms. furthermore, the publication investigates the position of symmetry in biology, in view of its ubiquitous significance in physics. In relation with the thought of prolonged serious transitions, the e-book proposes that organisms and their evolution will be characterised via persevered symmetry alterations, which debts for the irreducibility in their historicity and variability. The authors additionally introduce the idea that of anti-entropy as a degree for the opportunity of variability, being both understood as adjustments in symmetry. via this, the publication presents a mathematical account of Gould's research of phenotypic complexity with admire to organic evolution. the objective viewers basically includes researchers attracted to new theoretical ways to biology, from actual, organic or philosophical backgrounds, however the ebook can also be important for graduate scholars who are looking to input this field.

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5 Map of This Book It should be clear by now that this book is at the crossroads of (theoretical) physics and biology. As a consequence, certain passages will use mathematical techniques that can seem of some difficulty for the non-mathematically trained reader. However, the main mathematical tools used in this book are very simple and we will try to explain them both conceptually and intuitively in the text. Similarly, we will refer to numerous physical ideas that we will explain qualitatively (and for a few of them, quantitatively).

The observation of intraspecific allometry allows to obtain results for single species7 , and, as a consequence, to examine the potential changes of organization in development through a shift of allometric exponent, or a curve in log-log space. 8. 90. According to the authors, the situation is possibly better described by a quadratic curve in the log-log space (instead of a linear one), comforting the idea of possible changes of exponent during ontogeny. A general study, among five different phyla, [Glazier, 2006], found in particular that the exponent is higher for pelagic animals in comparison with benthic ones — including a shift when the considered species has a larval, pelagic lifestyle followed by a benthic adult stage.

Point as we said. Whereas our claim is that in the case of living systems, these coherent critical transitions are “extended” and maintained in such a way that they persist in the many dimensional space of analysis, while preserving all the physical properties mentioned above (diverging correlation lengths, new coherence structures, symmetry changes . . ). In other words, the critical transitions we look at are to be analyzed as taking place through an interval, not just a point, with respect to each control parameter.

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Perspectives on Organisms: Biological time, Symmetries and Singularities by Giuseppe Longo, Maël Montévil

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