蜘蛛丝中β折叠微晶的衍射
Diffraction from the beta-sheet crystallites in spider silk
摘要：
我们分析了从定向蜘蛛丝纤维的广角X射线散射的定量散射模型，包括结构和统计参数的$β$片的微晶蜘蛛丝在无定形基质。该模型是基于运动学散射理论，并允许相当一般的相关性的位置和取向的自由度，包括微晶的大小，组成和尺寸的单位细胞。该模型进行数值评估，并与实验散射强度，使我们能够提取的几何和统计参数。我们明确表明，实验发现的镶嵌性（宽度的取向分布）的晶粒间的影响是可以忽略不计的，可以分析的数据，在单晶散射方面，通常假设在文献中。
英文摘要：
We analyze the wide angle x-ray scattering from oriented spider silk fibers in terms of a quantitative scattering model, including both structural and statistical parameters of the $β$-sheet crystallites of spider silk in the amorphous matrix. The model is based on kinematic scattering theory and allows for rather general correlations of the positional and orientational degrees of freedom, including the crystallite's size, composition and dimension of the unit cell. The model is evaluated numerically and compared to experimental scattering intensities allowing us to extract the geometric and statistical parameters. We show explicitly that for the experimentally found mosaicity (width of the orientational distribution) inter-crystallite effects are negligible and the data can be analyzed in terms of single crystallite scattering, as is usually assumed in the literature.
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