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Cell Potential and Free Energy02:58

Cell Potential and Free Energy

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Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
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Free Energy01:21

Free Energy

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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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What is Energy?04:10

What is Energy?

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The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized...
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Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
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Potential Energy00:52

Potential Energy

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The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy.
Chemical bonds that form attractive forces between atoms also contain potential energy, called chemical energy. When a chemical reaction...
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Activation Energy01:26

Activation Energy

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Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
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Determination of Plasma Membrane Partitioning for Peripherally-associated Proteins
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細胞皮質におけるエネルギー分割

Sheng Chen1,2, Daniel S Seara2,3,4, Ani Michaud5,6

  • 1Department of Biomedical Engineering, Yale University, New Haven, CT, USA.

Nature physics
|February 12, 2026
PubMed
まとめ
この要約は機械生成です。

細胞は,細胞皮質の化学的および機械的活動の間にエネルギーを分割します. この分割は熱力学的原理に従っているが,細胞がより活発になるにつれて分解され,細胞の行動に影響を与えます.

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科学分野:

  • 細胞生物学 細胞生物学
  • バイオフィジックス 生物物理学
  • 熱力学は熱力学である.

背景:

  • 生きたシステムは,熱力学的な均衡から遠く離れた秩序を維持するためにエネルギーを消費します.
  • 化学的および機械的な活動における細胞パターンは,細胞の現象型と行動に決定的な役割を果たします.
  • 細胞内エネルギー分割のメカニズムは未だに十分に理解されていない.

研究 の 目的:

  • 細胞が細胞皮質の化学的および機械的な活動の間に内部エネルギーをどのように分割するのかを調査する.
  • エネルギー分割,熱力学平衡,および細胞パターンの間の関係を決定する.
  • 皮質のエネルギー動態の調節におけるRho GTPase経路の役割を調査する.

主な方法:

  • 細胞皮質の化学的および機械的サブシステムにおけるエントロピーの生成率の測定.
  • Rho GTPase経路の操作により,多種多様な皮質パターン (パルス,乱れ波,迷宮/スパイラル波) が誘発される.
  • Onsagerの相互性と,異なるパターンダイナミクスにおけるエネルギー分割の分析.

主要な成果:

  • エネルギーは,化学的および機械的サブシステム間で,より低い活動レベルでのオンスァーガー相互性 (ショッピー波) の下で比例的に分割されます.
  • エントロピーの生成率は,互換性の範囲内の乱れた波で最大化されます.
  • 相互性は破られ,皮質が迷宮状または螺旋状の波を形成し,化学的活動と機械的活動を切り離すため,エネルギー分割は微分化されます.
  • エネルギー分割と相互性は,化学反応と機械的なリラックス時間スケールの相互作用によって支配されます.

結論:

  • 細胞のエネルギー分割は動的に調節され,システムの熱力学的な均衡に近い状態に依存する.
  • Onsagerの相互性の崩壊は,細胞活動が増加するにつれて,エネルギー利用戦略のシフトを意味します.
  • 化学的および機械的スケール間のバランスは,細胞がパターン形成と機能のためのエネルギーをどのように管理するかを決定します.