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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Mechanisms of Heat Transfer I01:14

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer II01:20

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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An Introduction to Mechanics01:28

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Humans have been making ships, shelters, pyramids, weapons, agricultural equipment, and many more items without recording the process or theory behind them for centuries. It would be challenging to document the evolution of mechanics from its origin to the present.
According to records, the history of mechanics starts with Aristotle (384–322 BC). He related mechanics to physical theory, aiming for a universal synthesis.
Newton defined mechanics as the branch of physical science that...
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Updated: Jul 27, 2025

Reliable Mechanochemistry: Protocols for Reproducible Outcomes of Neat and Liquid Assisted Ball-mill Grinding Experiments
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機械化学への推進

Paul S Weiss1,2,3,4

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA), Los Angeles, CA, USA.

Science (New York, N.Y.)
|June 8, 2023
PubMed
まとめ
この要約は機械生成です。

分子に局所的な圧力をかけると 化学反応が加速します この方法は化学の反応速度と結果を制御する新しい方法を提供します.

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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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科学分野:

  • 化学について
  • 材料科学

背景:

  • 化学反応の速度は通常,温度,濃度,または触媒によって制御されます.
  • 外部の物理的な力は化学的運動を調節するためにあまり探求されていません.

研究 の 目的:

  • 化学反応を加速させる方向性のある局所圧力の影響を調査する.
  • 化学変化を制御する 新しい物理的方法を探求する

主な方法:

  • 反応物質の分子に 制御された局所的圧力をかけます
  • 先進的な顕微鏡とスペクトロスコピーを用いて 反応の進行を監視する.

主要な成果:

  • 圧力下での特定の化学反応の有意な加速を証明した.
  • 圧力方向性による反応経路の観測された変化

結論:

  • 化学反応を加速させるには 有効な戦略です
  • この技術は分子相互作用と反応運動を操作するための新しいツールを提供します.