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DiSCaMB: a software library for aspherical atom model X-ray scattering factor calculations with CPUs and GPUs
Michał L Chodkiewicz1, Szymon Migacz2, Witold Rudnicki2,3
1Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ulica Żwirki i Wigury 101, Warszawa, 02-089, Poland.
A new software, DiSCaMB, enhances X-ray crystallography by using aspherical pseudoatoms for improved accuracy in structural parameters. This open-source library offers high performance for advanced electron density modeling in structural chemistry and molecular biology.
Area of Science:
- Crystallography
- Computational Chemistry
- Structural Biology
Background:
- Classical X-ray refinement uses spherical atomic form factors, limiting accuracy.
- Advanced models employing aspherical pseudoatoms improve structural parameter precision but increase computational complexity.
Purpose of the Study:
- To introduce DiSCaMB (densities in structural chemistry and molecular biology), an open-source C++ library.
- To facilitate the adoption of advanced aspherical electron density models in crystallography.
- To provide a high-performance software solution for modern computing architectures.
Main Methods:
- Developed a C++ library with parallelization for multi-core CPUs and GPUs (CUDA).
- Implemented calculation of X-ray scattering factors and their derivatives.
- Included access to intermediate calculation steps for model experimentation and basic crystallographic operations.
Main Results:
- DiSCaMB offers high performance for advanced electron density calculations.
- The library enables accurate calculation of X-ray scattering factors and derivatives.
- Provides tools for structural crystallographic operations and model modification.
Conclusions:
- DiSCaMB lowers the barrier for using advanced aspherical electron density models in X-ray refinement.
- The software is suitable for integration into academic and commercial crystallographic tools.
- Enhances the accuracy of structural parameters in crystal structure analysis.
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