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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

4.5K
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.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
4.5K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

8.6K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.6K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

2.6K
2.6K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

3.0K
3.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.2K
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...
30.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.7K

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関連する実験動画

Updated: Dec 30, 2025

Optimization of Crystal Growth for Neutron Macromolecular Crystallography
12:29

Optimization of Crystal Growth for Neutron Macromolecular Crystallography

Published on: March 13, 2021

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結晶の成長変形剤の間の敵対的な協力性

Wenchuan Ma1, James F Lutsko2, Jeffrey D Rimer3,4

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, USA.

Nature
|January 17, 2020
PubMed
まとめ
この要約は機械生成です。

阻害剤のペアは,その特定のメカニズムと濃度に応じて,シネジスティックまたは対抗的に結晶の成長を阻害することができます. この発見は,複雑なシステムにおける結晶化を制御するための新しい戦略を提供します.

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Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments
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Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments

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Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering

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関連する実験動画

Last Updated: Dec 30, 2025

Optimization of Crystal Growth for Neutron Macromolecular Crystallography
12:29

Optimization of Crystal Growth for Neutron Macromolecular Crystallography

Published on: March 13, 2021

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Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments
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Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments

Published on: February 4, 2021

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Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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科学分野:

  • 結晶化科学
  • 材料科学
  • バイオ物理学

背景:

  • 多成分環境からの結晶化は,自然と産業で一般的です.
  • 実験室の研究は,主に純粋な溶液結晶化と単一の成長修正剤に焦点を当てている.
  • 結晶変異因子を理解することは,物質合成と生物学的プロセスを制御するために不可欠です.

研究 の 目的:

  • ヘマチン結晶化を阻害するペアの分子メカニズムを調査する.
  • 異なった結晶化変容体間の相乗効果と対抗性の協力性を探求する.
  • 材料合成を導くために結晶化変形剤の相互作用に関する分子視点を開発する.

主な方法:

  • 分子レベルで結晶の成長を観察するために,スキャニングプローブ顕微鏡 (SPM) を利用した.
  • 阻害物質と結晶の相互作用をシミュレートし理解するために分子モデリングを使用した.
  • 異なるメカニズムで試験された阻害剤のペア:キンクブロックとステップピン.

主要な成果:

  • 阻害剤のペアは,ヘマチンの結晶化を阻害する際に,共効果と対抗効果の両方を示した.
  • 協力性は,特定の阻害剤の組み合わせと適用された濃度に依存した.
  • キンク・ブロッカーは,ステップ・エッジ・ラインの緊張を軽減し,結晶層の核形成と拡散を促進することが判明した.

結論:

  • 結晶変形剤間の敵対的な協力性は,現在の結晶成長モデルによって捉えられない.
  • モディファイヤーの相互作用の分子理解は,材料合成におけるモディファイヤーのペアリングの指針を提供します.
  • これらの発見は,複雑な自然と人工システムの結晶化を制御するための戦略を提供します.