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Related Concept Videos

Chemiosmosis01:32

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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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Coupled Reactions01:17

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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Electron Transport Chain Components01:29

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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Chemiosmosis and ATP Synthesis01:22

Chemiosmosis and ATP Synthesis

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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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Updated: Apr 26, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

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Chemiosmotic coupling. Protons fast and slow

S J Ferguson1

  • 1Department of Biochemistry, University of Oxford, UK.

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|January 1, 1995
PubMed
Summary
This summary is machine-generated.

Proton movements in chemiosmotic energy coupling may occur along membrane surfaces. This finding suggests localized proton flow is key to cellular energy generation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Bioenergetics

Background:

  • Chemiosmotic energy coupling is a fundamental process for ATP synthesis in cells.
  • Proton gradients across membranes drive this energy conversion.
  • The precise mechanism and location of proton movement are areas of active research.

Purpose of the Study:

  • To investigate the spatial dynamics of proton movements during chemiosmotic energy coupling.
  • To determine if proton translocation occurs preferentially along membrane surfaces.

Main Methods:

  • Utilized advanced biophysical measurement techniques.
  • Analyzed proton translocation pathways in biological membranes.

Main Results:

  • Recent measurements indicate a preference for localized proton movements along membrane surfaces.
  • This suggests a non-bulk diffusion mechanism for proton translocation.

Conclusions:

  • Proton movements in chemiosmotic coupling may be spatially restricted to membrane surfaces.
  • Localized proton flow could be a critical factor in efficient cellular energy production.