Three-Dimensional Reconstruction of Helical Structures from Small-Angle X-ray Scattering Data

IF 0.6 4区 材料科学 Q4 CRYSTALLOGRAPHY
V. A. Grigorev, P. V. Konarev, V. V. Volkov
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引用次数: 0

Abstract

Helical particles are of interest because of their similarity to real nanostructures that are formed in processes of self-organization of biopolymers (for example, carrageenans, DNA, etc.). On the other hand, the determination of the structural parameters of such particles from small-angle X-ray scattering data is a complex issue due to the poor conditionality of the inverse problem. This is evident from the practice of using the well-known bead modeling programs. The study considers a modification of the search algorithm in a limited area of space and the behavior of the solutions depending on the parameters of the objective function responsible for the connectivity of the structure, the weight scheme for the scattering intensity curve, and the angular range of the data. The stability of the solutions was statistically assessed using a sequential model search by varying the weights of the penalty terms. The empirical dependences of the optimal values of the search parameters on the parameters of the pair distance distribution curves were determined.

Abstract Image

从小角 X 射线散射数据三维重建螺旋结构
螺旋粒子之所以引起人们的兴趣,是因为它们与生物聚合物自组织过程中形成的真实纳米结构相似(例如,卡拉胶、DNA等)。另一方面,由于反问题的条件较差,从小角度x射线散射数据中确定这类粒子的结构参数是一个复杂的问题。这从使用著名的头部建模程序的实践中是显而易见的。该研究考虑了在有限空间区域内对搜索算法的修改,并考虑了解的行为取决于负责结构连通性的目标函数的参数、散射强度曲线的权重格式和数据的角度范围。通过改变惩罚项的权重,使用顺序模型搜索来统计评估解决方案的稳定性。确定了搜索参数的最优值与对距离分布曲线参数的经验依赖关系。
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来源期刊
Crystallography Reports
Crystallography Reports 化学-晶体学
CiteScore
1.10
自引率
28.60%
发文量
96
审稿时长
4-8 weeks
期刊介绍: Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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