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Nucléation de glace et substances et mécanismes inhibant la nucléation dans la nature.

Ice nucleation and antinucleation in nature.

Auteurs : ZACHARIASSEN K. E., KRISTIANSEN E.

Type d'article : Article

Résumé

Plants and ectothermic animals use a variety of substances and mechanisms to survive exposure to subfreezing temperatures. Proteinaceous ice nucleators trigger freezing at high subzero temperatures, either to provide cold protection from released heat of fusion or to establish a protective extracellular freezing in freeze-tolerant species. Freeze-avoiding species increase their supercooling potential by removing ice nucleators and accumulating polyols. Terrestrial invertebrates and polar marine fish stabilize their supercooled state by means of noncolligatively acting antifreeze proteins. Some organisms also depress their body fluid melting point to ambient temperature by evaporation and/or solute accumulation.

Détails

  • Titre original : Ice nucleation and antinucleation in nature.
  • Identifiant de la fiche : 2002-1628
  • Langues : Anglais
  • Source : Cryobiology - vol. 41 - n. 4
  • Date d'édition : 12/2000

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