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Mem 106 c20-predictions from biophysical models of thermogenic events in cones. reviews, prices and ethical sellers

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Mem 106 c20-predictions from biophysical models of thermogenic events in cones. sold by nybgshop.org for $4.99

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This purchase only includes chapter 20 of this title.

Abstract

The diel thermogenic events of male cones of¬†Macrozamia lucida¬†L. Johnson and M. macleayi¬†Miq. that occur in a temperate springtime climate are compared with those of¬†Cycas micronesica K. D. Hill, which grows in a warm tropical climate. All three species¬†exhibit thermogenic daytime diel cone temperature increases whose major characteristics¬†are consistent with trends predicted by an energy balance model that incorporates an¬†Arrhenius equation model of the cone metabolism√Ę‚ā¨‚ĄĘs dependence on temperature. For the¬†Macrozamia species there is good quantitative agreement between model predictions and¬†experimental measurements of their large temperature peaks, which are predicted to¬†arise from a thermo-chemical metabolic instability. In contrast, C. micronesica cones have¬†much smaller diel temperature peaks, and a metabolic heating rate that remains approximately¬†constant throughout each day except for a small increase in the afternoon resulting¬†in the cone temperature peak. These C. micronesica patterns are qualitatively consistent¬†with the Arrhenius model of metabolic heating rate increasing with temperature, but¬†without their reaching an unstable condition. The qualitative similarities and quantitative¬†differences in thermal behavior between these species are possibly associated with¬†the species√Ę‚ā¨‚ĄĘ adaptation of the same basic thermogenic mechanism to their signifi cantly¬†diff erent in situ ambient conditions. All three species appear to limit their temperature¬†elevations to




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