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Related Experiment Videos

Virtual intermediates in photosynthetic electron transfer.

J S Joseph1, W Bialek

  • 1Graduate Group in Biophysics, University of California, Berkeley 94720.

Biophysical Journal
|August 1, 1992
PubMed
Summary

Virtual transfer in photosynthetic bacteria is possible, but high-frequency coupling broadens expected peaks and weakens temperature dependence. New experiments can distinguish virtual from two-step transfer mechanisms.

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Area of Science:

  • * Photosynthetic energy transfer mechanisms.
  • * Quantum dynamics in biological systems.

Background:

  • * Primary charge separation in photosynthetic bacteria is crucial for energy conversion.
  • * Virtual transfer and two-step transfer are proposed mechanisms.
  • * Experimental data, including Stark spectroscopy, are used to investigate these processes.

Purpose of the Study:

  • * To explore the possibility of virtual transfer in primary charge separation.
  • * To analyze the influence of high-frequency modes and electric fields on virtual transfer.
  • * To differentiate between virtual transfer and two-step transfer using experimental data.

Main Methods:

  • * Analysis of experimental data, including Stark absorption kinetics and fluorescence anisotropy.
  • * Theoretical modeling of energy transfer dynamics.
  • * Proposal of a two-pulse excitation experiment for mechanistic distinction.

Main Results:

  • * High-frequency coupling significantly broadens expected peaks in virtual transfer rates.
  • * Stark absorption kinetics data support the occurrence of virtual transfer.
  • * Stark fluorescence anisotropy data can be consistent with both virtual and two-step transfer.
  • * Virtual absorption contributes to Stark spectra independently of absorption spectrum derivatives.

Conclusions:

  • * Virtual transfer is a plausible mechanism in primary charge separation, influenced by high-frequency coupling.
  • * Distinguishing between virtual and two-step transfer requires careful experimental design.
  • * A proposed two-pulse experiment can quantify contributions from both mechanisms.

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