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The Effect of Type Ⅰ Antifreeze Proteins on the Equilibrium Structure of Interfacial Layer of Ice Crystal

Author: XieWenJing
Tutor: LiuJunJie
School: Inner Mongolia University
Course: Biophysics
Keywords: Ice crystals Antifreeze proteins Multi- interface model Interface layer structure
CLC: Q51
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


Antifreeze proteins (Antifreeze Proteins, AFPs) are a class can inhibit the growth of ice crystals specific proteins, which can reduce the non-colligative ice growing point temperature, but has little effect on the melting point of ice, resulting in the melting and freezing point of the aqueous solution a difference between a phenomenon known as thermal hysteresis phenomenon (Thermal Hysteresis). As a special antifreeze antifreeze protein nature, so that in molecular biology, biophysics and biochemistry research areas subject to considerable attention. Researchers in succession from marine fish, terrestrial insects, plants, bacteria and fungi, and other organisms isolated many different types of antifreeze proteins and determination of their amino acid sequence and spatial structure. Experimental results show that the combination of antifreeze protein molecules ice surface and the ice surface has a specific affinity for the solution of antifreeze protein molecules can select a specific direction some ice crystal surface adsorption, this process also produces thermal hysteresis phenomenon is a key step. Ice crystals in antifreeze protein solution in the form of growing freely in water with different growth forms. According to the ice crystal growth theory, a driving force of the growth, the growth mechanism and the kinetics of the interface determines the shape of the ice crystal growth, the growth mechanism and kinetics of the interface depends on the microstructure of ice-water interface, the antifreeze protein solution the growth of ice crystals form one of the main changes is the antifreeze protein that ice surface microstructure changed. This departure from the thermodynamic properties of macromolecular solution obtained after the ice surface of the antifreeze protein binding equilibrium microscopic changes in the structure and discuss the changes on the ice crystal growth morphology. According to the growth of ice crystals in the aqueous solution of the basic thermodynamic properties, the application of multi-interface model, ice crystals were obtained in pure water and antifreeze protein solution interface layer grown in the Gibbs free energy. Ice crystal growth by the Gibbs free energy of the interface layer of ice crystals in three different first class fish antifreeze protein molecules in solution in thermal equilibrium balanced growth interface layer microscopic structure of ice crystals in antifreeze protein solutions found when grown with when grown in pure water interface layers several significant changes, combined with the growth of ice crystals after antifreeze protein from the rough interface interface layer into a smooth interface and discusses the growth of ice crystals after antifreeze protein binding interface layer microscopic changes in the structure of balance ice crystal growth morphology. To understand the ice crystals in antifreeze protein solutions and in pure water with different growth habits and growth patterns that provide a theoretical basis for the experimental facts.

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CLC: > Biological Sciences > Biochemistry > Protein
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