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Related Concept Videos

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Decoherence-assisted transport in a dimer system.

I Sinayskiy1, A Marais, F Petruccione

  • 1School of Physics and National Institute for Theoretical Physics, University of KwaZulu-Natal, Durban, South Africa.

Physical Review Letters
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Decoherence in dimer systems can surprisingly aid energy transfer. Correlated environments enhance this process more effectively than independent ones, revealing new quantum dynamics insights.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Chemical physics

Background:

  • Understanding energy transfer dynamics in quantum systems is crucial.
  • The influence of environmental interactions (decoherence) on quantum processes is complex.
  • Dimer systems serve as fundamental models for studying energy transport.

Purpose of the Study:

  • To investigate the role of decoherence in a dimer system coupled to two distinct spin star environments.
  • To determine how independent versus correlated environments affect energy transfer.
  • To identify parameter regimes where environmental interaction assists energy transfer.

Main Methods:

  • Analytical derivation of transition probabilities for the dimer system.
  • Modeling the dimer coupled to two spin star environments.
  • Analysis of decoherence effects under different environmental correlations.

Main Results:

  • Exact analytical expressions for transition probabilities were obtained.
  • Decoherent interaction with the environment was shown to assist energy transfer within specific parameter ranges.
  • Correlated environments demonstrated more efficient assistance for energy transfer compared to independent environments.

Conclusions:

  • Environmental decoherence is not always detrimental and can facilitate energy transfer in dimer systems.
  • The nature of environmental correlation significantly impacts the efficiency of energy transfer.
  • This study provides a theoretical framework for designing quantum systems with enhanced energy transport capabilities.