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How Do Certain Frogs Survive Being Frozen Solid All Winter?
某些青蛙如何在整冬被完全冻成冰块后仍能存活？
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Wood frogs stop breathing, halt heartbeats, and freeze up to 65% of their body water into ice crystals.
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Special glucose proteins flood their blood, acting as natural antifreeze to protect cells from damage.
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Ice forms only between cells—not inside them—preventing lethal ruptures during expansion.
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Their metabolism drops to nearly zero, conserving energy until spring thaws trigger revival.
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Enzymes responsible for DNA repair become highly active immediately after thawing begins.
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Scientists identified cryoprotectant genes that activate only when temperatures fall below 0°C.
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Frogs buried under leaf litter survive because snow insulates them from extreme cold swings.
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This adaptation lets them inhabit colder regions than most amphibians can tolerate.
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Biomedical researchers study these frogs to improve human organ preservation techniques.
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Field experiments show survival rates drop sharply if freeze-thaw cycles exceed three per season.