BIO203_CompPhysiol_Cold

BIO203_CompPhysiol_Cold - Life in the Cold Sherwood,...

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1 Sherwood, Klandorf & Yancey, Animal Physiology: From Genes to Organisms , p. 499 Life in the Cold B. Maher, Nature 458: 695-698, 2009 Colligative Properties • Osmotic Pressure • Freezing Point Depression • Vapor Pressure Lowering • Boiling Point Elevation 1 molal aqueous solution -1.86 °C freezing point Freezing Points Seawater: ~1000 mosm·L -1 ~ -2 °C Plasma: ~350 mosm·L -1 ~ -0.7 °C
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2 A.L. DeVries and D.E. Wohlschlag, Science 163: 1073-1075, 1969 Freeze Damage • Physical disruption by ice crystals of cytoplasm and/or cell membrane • Dehydration (ice crystals form first in ECF; draw water from cytoplasm) Survival Strategies • Behavioral avoidance (burrowing; frogs, turtles) • Freeze tolerance (insects, some vertebrates) • Limit damage from ice crystals (protein-water associations) • Limit freezing to ECF and regulate cell volume by colligative agents (to prevent dehydration) • Freeze avoidance (invertebrates and vertebrates) • Supercooling • Colligative protection against freezing
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BIO203_CompPhysiol_Cold - Life in the Cold Sherwood,...

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