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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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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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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Thermal Transport in One-Dimensional Electronic Fluids.

R Samanta1, I V Protopopov2,3, A D Mirlin3,4,5,6

  • 1Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel.

Physical Review Letters
|June 8, 2019
PubMed
Summary
This summary is machine-generated.

This study reveals how thermal conductivity in one-dimensional electronic fluids behaves. Heat transport is governed by bosonic and fermionic excitations, with Lévy flights of bosons dominating at low frequencies and large scales.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Fluids
  • Statistical Mechanics

Background:

  • One-dimensional (1D) electronic fluids exhibit unique quantum phenomena.
  • Understanding thermal transport in these systems is crucial for novel electronic devices.
  • Previous models often simplified the complex interactions within these fluids.

Purpose of the Study:

  • To investigate the thermal conductivity of 1D electronic fluids.
  • To analyze the distinct contributions of bosonic and fermionic sectors to heat transport.
  • To identify novel scaling behaviors in thermal transport at different frequency and length scales.

Main Methods:

  • Theoretical analysis of a many-body system.
  • Partitioning the Hilbert space into bosonic and fermionic sectors.
  • Examining conserved momenta and decay processes of excitations.

Main Results:

  • Ballistic heat propagation and imaginary thermal conductivity (T/iω) observed at short times.
  • Real part of thermal conductivity shows frequency-dependent regimes governed by decay processes.
  • Lévy flights of low-momentum bosons lead to fractional scaling (ω^{-1/3}, L^{1/3}) at low frequencies/long lengths.

Conclusions:

  • The interplay between bosonic and fermionic sectors dictates thermal conductivity in 1D fluids.
  • Lévy flights represent a key mechanism for anomalous thermal transport.
  • The findings offer new insights into quantum transport phenomena in low-dimensional systems.