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関連する概念動画

Orthogonal Trajectories01:26

Orthogonal Trajectories

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Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
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Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH01:21

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Drug absorption within the gastrointestinal (GI) tract is a complex process influenced by several critical factors, including the site pH, the drug's dissociation constant (pKa), and the drug's lipophilicity. The GI tract exhibits a pH gradient, with an acidic environment in the stomach and a more alkaline environment in the small intestine. This pH variation directly affects the ionization state of drugs.
A drug's pKa and the pH of the gastrointestinal (GI) tract play crucial roles...
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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Indicators

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
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Studying Cell Rolling Trajectories on Asymmetric Receptor Patterns
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TrIPP:軌道のイテラティブpKa予測器

Christos Matsingos1,2, Ka Fu Man1, Arianna Fornili1

  • 1Department of Chemistry, School of Physical and Chemical Sciences, Queen Mary University of London, London, E1 4NS, United Kingdom.

Bioinformatics (Oxford, England)
|February 12, 2026
PubMed
まとめ
この要約は機械生成です。

タンパク質残留のイオン化状態 (pK a) は,その環境によって変化します. TrIPP (Trajectory Iterative pK a Predictor) は,分子動態シミュレーション中にこれらのpKaシフトを分析し,タンパク質の構造と機能とリンクします.

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Last Updated: Feb 14, 2026

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科学分野:

  • バイオケミストリー バイオケミストリー
  • コンピュータ生物学 コンピュータ生物学
  • 構造生物学 構造生物学とは

背景:

  • タンパク質の機能は,残留物のイオン化状態によって調節されます.
  • 地元の環境の変化は,残留物プロトネーションに大きく影響する.
  • タンパク質のダイナミクスは,pKa値と密接に関連しており,pHの調節に不可欠です.

研究 の 目的:

  • タンパク質のpKa変異を分析するための新しいPythonツールであるTrIPPを紹介します.
  • 分子ダイナミクス (MD) の軌道を沿ってイオン化残留物pK aの変化を追跡し,分析します.
  • タンパク質の局所的およびグローバルな環境変化と相関するpK aのシフト.

主な方法:

  • トライプ (Trajectory Iterative pK a Predictor) ソフトウェアの開発. トライプ (Trajectory Iterative pK a Predictor) ソフトウェアの開発. トライプ (Trajectory Iterative pK a Predictor) ソフトウェアの開発. トライプ (Trajectory Iterative pK a Predictor) ソフトウェアの開発. トライプ (Trajectory Iterative pK a
  • MDシミュレーションを使用して,タンパク質の軌道のデータを生成します.
  • タンパク質構造内の電離可能な残留物のpKa値の分析.

主要な成果:

  • ダイナミックなpKaの変動を追跡するTrIPPの能力を実証しました.
  • シミュレーション中に生理学的に重要なpK a変化を示す,特定された残留物.
  • リンクされた観察されたpK aは,タンパク質のマイクロ環境における特定の変化にシフトします.

結論:

  • 残留のプロトネーション傾向は,環境の変化に敏感である.
  • TrIPPは,pK aの動態とその機能的影響の研究を容易にする.
  • pKaの変異を理解することは,pH依存タンパク質の振る舞いを解明する鍵です.