By Philip C. Withers, Christine E. Cooper (auth.), Carlos Arturo Navas, José Eduardo Carvalho (eds.)
Numerous animal species stay in environments characterised by means of a seasonal relief within the availability of water, which regularly yet no longer constantly happens whilst temperatures are maximum. for plenty of such animals, survival through the hardest season calls for spending lengthy sessions of time in a slightly inactive nation often called aestivation. yet aestivation is way greater than closing inactive. profitable aestivation calls for the choice of a formal microhabitat, variable levels of metabolic arrest and responsiveness to exterior stimuli, the facility to feel the correct time of 12 months for emergence, the upkeep of inactive tissue, and masses extra. So, aestivation contains a posh selection of behaviors, ecological institutions and physiological changes that fluctuate throughout species of their style, significance and direction. This ebook seeks to discover the phenomenon of aestivation from diverse views and degrees of association, starting from microhabitat choice to genetic regulate of physiological alterations. It brings jointly authors from internationally engaged on assorted systematic teams, techniques, and questions, yet who're all eventually operating to higher comprehend the advanced factor of aestivation.
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Extra resources for Aestivation: Molecular and Physiological Aspects
Why would this be? The prominent role of G6PDH in antioxidant defense may be the answer. Enhancement of antioxidant defenses is proving to be a universal feature of hypometabolism across phylogeny (Hermes-Lima et al. 1998; Storey and Storey 2007; Ferreira-Cravo et al. 2009). This helps to prevent/minimize oxidative damage to macromolecules during dormancy, a state in which organisms cannot afford the high ATP expenditures associated with repairing, degrading, or resynthesizing macromolecules damaged by reactive oxygen species (ROS).
C. E. Cooper survive torpor, and species physiologically capable of torpor do not necessarily use it routinely. , digestion, growth, muscle function) are optimal at a relatively high and narrow range of Tbs, in part due to the Q10 effect on chemical processes and because of optimal temperatures for enzymemediated biochemical processes. Thus, maintenance of thermal homeostasis has fundamental physiological advantages over heterothermy (but this occurs at the cost of high energy expenditure). , freezing).
M, n = 4–5 animals. 05. Compiled from Ramnanan et al. (2009) 2 Metabolic Regulation and Gene Expression During Aestivation 33 phospho-eIF4GI (Ser1108) decreased strongly in hepatopancreas during aestivation. Similarly, the content of phospho-eIF4E (Ser209) decreased strongly in foot muscle after 14 days of aestivation (Ramnanan et al. 2009). Reduced phosphorylation of both proteins is consistent with translational inhibition during aestivation. Furthermore, eIF4E is closely regulated by reversible association with a specific binding protein, 4E binding protein (4E-BP1).