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Cited by 487Photosynthetic Processes and MechanismsPhotochemistry and Electron Transfer StudiesSpectroscopy and Quantum Chemical Studies

Studies of Photosynthesis Using a Pulsed Laser

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De Vault, Don, Chance, Britton·1966·Biophysical Journal
DOI 10.1016/s0006-3495(66)86698-5PMC PMC1368046
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Abstract

The rate of oxidation of cytochrome following absorption of a short pulse of light from a ruby laser in the photosynthetic bacterium Chromatium has been measured spectrophotometrically. The half-time is about 2 musec at room temperature increasing to 2.3 msec at about 100 degrees K and constant at the latter value to 35 degrees K or below. The temperature dependence above 120 degrees K corresponds to an activation energy of 3.3 kcal/mole; that below 100 degrees K to less than 80 cal/mol: essentially a temperature-independent electron transport reaction. Since the slowness below 100 degrees K indicates the presence of a barrier, the lack of activation energy is taken to mean penetration by quantum-mechanical "tunneling."

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  • In 1966, DeVault and Chance observed a temperature dependence of the electron transfer in purple bacterial reaction centres that could not be accounted for by classical physics.

    “In 1966, DeVault and Chance observed a temperature dependence of the electron transfer in purple bacterial reaction centres that could not be accounted for by classical physics [53].”

    From The future of quantum biology (2018) · cites this paper as [53]

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Research works printed but not linked: 66

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Authors
De Vault, D., & Chance, B.
Affiliations
University of Pennsylvania (US)
Venue
Biophysical Journal
Publisher
Elsevier BV
Published
1966-11
Volume
6
Issue
6
Pages
825-847
ISSN
0006-3495 (ISSN-L)
DOI
10.1016/s0006-3495(66)86698-5
PMC
PMC1368046
OpenAlex
W308487888
Cited by
487
References
24
Citations by year
2026: 5 · 2025: 6 · 2024: 6 · 2023: 5 · 2022: 5 · 2021: 7 · 2020: 8 · 2019: 1 · 2018: 11 · 2017: 2 · 2016: 5 · 2015: 6 · 2014: 15 · 2013: 5 · 2012: 3
FWCI
3.08
Type
journal article
Language
en
Open access
Licence
Locations
  • Biophysical Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Public Health Service (GM 12202)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
Keywords
photosynthesis, cytochrome oxidation, electron transport, Chromatium, photosynthetic bacteria, ruby laser, pulsed light, temperature dependence, activation energy, quantum tunneling, low-temperature kinetics
MeSH terms
Chromatium, Cytochromes, Lasers, Light, Oxidation-Reduction, Photosynthesis, Spectrophotometry, Thermodynamics

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