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Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

33.2K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
33.2K
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Nucleic Acid Structure01:25

Nucleic Acid Structure

9.4K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
9.4K
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

21.6K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
21.6K
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

3.8K
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
3.8K
Protein and Protein Structure02:15

Protein and Protein Structure

88.9K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
88.9K

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関連する実験動画

Updated: Feb 12, 2026

Automated Robotic Liquid Handling Assembly of Modular DNA Devices
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Automated Robotic Liquid Handling Assembly of Modular DNA Devices

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構造探査のためのポリグルキュロン酸の自動組立

Sandhya N Mardhekar1, Dominik Weh1,2, Martina Delbianco1

  • 1Department of Biomolecular Systems, Max-Planck-Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany.

Journal of the American Chemical Society
|February 11, 2026
PubMed
まとめ
この要約は機械生成です。

研究者は,自動グリカンアセンブリを使用して,ポリグルキュロン酸 (PGA) オリゴーマーを正確に合成しました. これらの明確に定義されたモデルは,カルシウム結合に関する洞察を明らかにし,新しいグリコマテリアルの開発のための枠組みを提供します.

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科学分野:

  • バイオポリマーの合成
  • 炭水化物の化学反応
  • 材料科学は材料科学である.

背景:

  • ポリウロン酸は,重要な生物学的プロセスに関与する重要な海洋バイオポリマーです.
  • 彼らの構造的異質性は,構造-機能関係の理解を複雑にする.

研究 の 目的:

  • 定義されたポリグルキュロン酸 (PGA) オリゴーマーを精密に合成する方法を開発する.
  • これらの合成オリゴマーの構造的および機能的性質,特にカルシウム結合を調査する.

主な方法:

  • 自動グリカンアセンブリ (AGA) は,β-(1-4) に結合したd-グルキュロン酸 (GlcA) オリゴーマーを合成する.
  • オリゴーマー構造と柔軟性を分析するための分子動力学シミュレーション.
  • カルシウム結合相互作用を研究するためのNMRタイトレーション.

主要な成果:

  • 鎖の長さとステレオ化学を制御した GlcA オリゴーマーを合成しました.
  • シミュレーションにより,2重の螺旋形状が示され,短いオリゴーマーには硬さ,長いオリゴーマーには柔軟性がある.
  • NMRは,局所的なケラ化ではなく,拡散した静電カルシウム結合を明らかにした.

結論:

  • 定義されたPGAオリゴマーは,イオン相互作用を研究するための貴重な分子モデルとして機能します.
  • この研究は,高度な尿酸ベースの糖質物質を設計し,特異な性質を持つための基礎を提供します.