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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Author Spotlight: Advancing Protein Structure Analysis for Drug Development
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Recent developments in CrystFEL.

Thomas A White1, Valerio Mariani1, Wolfgang Brehm2

  • 1Centre for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.

Journal of Applied Crystallography
|April 6, 2016
PubMed
Summary
This summary is machine-generated.

CrystFEL software has been enhanced with new programs and improved data processing for serial crystallography experiments. These updates resolve indexing ambiguities and refine diffraction physics modeling for better data quality.

Keywords:
X-ray free-electron lasersXFELscomputer programsdata processingserial crystallography

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Area of Science:

  • Structural Biology
  • Crystallography
  • Biophysics

Background:

  • Serial crystallography is a powerful technique for determining protein structures.
  • X-ray free-electron lasers (FELs) and other X-ray sources are increasingly used for these experiments.
  • The CrystFEL software suite has been a key tool for processing serial crystallography data since 2009.

Purpose of the Study:

  • To detail significant improvements made to the CrystFEL software suite since its initial release.
  • To highlight advancements in data processing for serial crystallography experiments.
  • To showcase new features that enhance data quality and analysis.

Main Methods:

  • Addition of new programs to the CrystFEL suite.
  • Development of methods to resolve indexing ambiguities in diffraction data.
  • Implementation of improved models for diffraction physics to enhance data integration accuracy.

Main Results:

  • The updated CrystFEL suite offers expanded functionality for serial crystallography data processing.
  • Resolved indexing ambiguities lead to more reliable structural determination.
  • Enhanced modeling of diffraction physics improves the quality and precision of integrated data.

Conclusions:

  • The recent updates to CrystFEL provide researchers with more robust tools for serial crystallography.
  • These improvements facilitate higher quality data acquisition and structural analysis.
  • CrystFEL continues to be a vital software package for the structural biology community utilizing advanced X-ray sources.