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Growth modes and energetics of (101) face lysozyme crystal growth

机译:(101)溶菌酶晶体生长的生长模式和能量学

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From analyses of lysozyme (101) face growth rate data using a 2D nucleation model for layer-bylayer growth, we find the effective barrier for crystal growth to be gamma = 1.0 +/- 0.2 x 10(-13) erg/molecule. The magnitude of the effective barrier is (2.4 +/- 0.5)k(B)T, at 22 degrees C. We also find that beyond a critical solution supersaturation, sigma(c) crystal growth rates are more accurately described by a kinetic roughening hypothesis. Beyond sigma(c), crystals grow by the continuous addition of molecules anywhere on the crystal surface rather than layer-by-layer. The magnitude of the critical supersaturation (sigma(c) = 1.7 +/- 0.2) for a crossover from a layer-by-layer to continuous growth is found to be statistically independent of the solution conditions that vary with buffer pH, temperature, or precipitant concentration. Using the experimentally determined values for gamma and sigma(c), we find the crystal growth unit to be comprised of 7 +/- 3 molecules. The energy barrier, E-c, for the continuous addition of the growth units is 6.2 +/- 0.3 x 10(-13) erg/molecule or (15 +/- 1)kBT at 22 degrees C.
机译:通过使用2D成核模型逐层生长的溶菌酶(101)面生长速率数据进行分析,我们发现晶体生长的有效屏障为γ= 1.0 +/- 0.2 x 10(-13)erg /分子。在22摄氏度时,有效势垒的大小为(2.4 +/- 0.5)k(B)T。我们还发现,除了临界溶液过饱和之外,sigma(c)晶体的生长速率可以通过动力学粗糙化来更准确地描述假设。除sigma(c)外,晶体通过在晶体表面上的任意位置(而不是逐层地)连续添加分子来生长。发现从逐层过渡到连续生长的临界过饱和度的大小(sigma(c)= 1.7 +/- 0.2)在统计上与溶液条件无关,该溶液条件随缓冲液pH,温度或沉淀剂浓度。使用实验确定的gamma和sigma(c)值,我们发现晶体生长单元由7 +/- 3个分子组成。在22摄氏度下,连续添加生长单位的能垒E-c为6.2 +/- 0.3 x 10(-13)erg /分子或(15 +/- 1)kBT。

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