994 resultados para Geological Society of London. Library


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Published <1980-2007>: Oxford : Blackwell, for the Society; <2010-2011>: Wiley-Blackwell for the Society.

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Mode of access: Internet.

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Published later under title: Estate clerk of works and country builder.

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Mode of access: Internet.

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A classified catalog with alphabetical subject index.

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Includes index.

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Includes bibliographical references.

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"Brought down to 1898. Annual lists of additions published in the Kew bulletin."

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The effectiveness of behavioural thermoregulation in reptiles is amplified by cardiovascular responses, particularly by differential rates of heart beat in response to heating and cooling (heart-rate hysteresis). Heart-rate hysteresis is ecologically important in most lineages of ectothermic reptile' and we demonstrate that heart-rate hysteresis in the lizard Pogona vitticeps is mediated by prostaglandins. In a control treatment (administration of saline), heart rates during heating were significantly faster than during cooling at any given body temperature. When cyclooxygenase 1 and 2 enzymes were inhibited, heart rates during heating were not significantly different from those during cooling. Administration of agonists showed that thromboxane B-2 did not have a significant effect on heart rate, but prostacyclin and prostaglandin F-2alpha caused a significant increase (3.5 and 13.6 beats min(-1), respectively) in heart rate compared with control treatments. We speculate that heart-rate hysteresis evolved as a thermoregulatory mechanism that may ultimately be controlled by neurally induced stimulation of nitric oxide production, or maybe via photolytically induced production of vitamin D.