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Pit Formation on the Basal Plane of Ice in Antifreeze Protein Type III Solution for Different Growth Mechanisms of Ice

机译:抗冰蛋白III型溶液中不同冰生长机理的冰基面上坑形成

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摘要

When a single crystal of ice that has the basal plane several tenths of mm(2) in area grows in a moderately active antifreeze protein (AFP) solution, numerous pits consisting of six pyramidal planes are formed on the basal plane. This pit formation suggests some interactions between the AFPs and the basal plane. In this study, we observed pit formation on the basal plane of ice growing in a 5 mg/mL fish AFP (type III) solution and examined three growth mechanisms (normal, spiral, and two-dimensional (2D) nucleation) of the basal plane by measuring the relationship between the growth rate and the degree of supercooling. We also measured the number density of pits in ice and found that the number density of pits for normal growth mode on molecularly rough surfaces was lower than that for spiral growth mode on relatively smooth surfaces, whereas pit formation was not observed during 2D nucleation growth mode. On the basis of these results, we proposed a model of pit formation during spiral growth mode. In this model, if only reversible adsorption of the AFP molecules on the smooth surfaces is considered to occur, then pit formation can be explained without assuming irreversible adsorption on the smooth surfaces.
机译:当具有基面的冰的单个晶体在中等活性的抗冻蛋白(AFP)溶液中生长十分之几mm(2)的面积时,在基面上会形成由六个锥体平面组成的大量凹坑。这种凹坑的形成表明AFP与基底平面之间存在一些相互作用。在这项研究中,我们观察到了在5 mg / mL鱼AFP(III型)溶液中冰生长的基底平面上的凹坑形成,并研究了基底的三种生长机理(正态,螺旋形和二维(2D)成核)通过测量增长速度和过冷度之间的关系来确定平面。我们还测量了冰中凹坑的数量密度,发现分子粗糙表面上正常生长模式的凹坑数量密度低于相对光滑表面上螺旋生长模式的凹坑数量密度,而在二维成核生长模式中未观察到凹坑形成。在这些结果的基础上,我们提出了螺旋生长模式下的孔形成模型。在该模型中,如果仅认为AFP分子在光滑表面上发生可逆吸附,则可以解释凹坑形成,而无需假设在光滑表面上存在不可逆吸附。

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