✦ LIBER ✦

The effect of pressure on charge separation in photosynthetic bacterial reaction centers of Rhodopseudomonas viridis

✍ Scribed by Neil L. Redline; Maurice W. Windsor

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 652 KB
Volume: 198
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85061-e

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✦ Synopsis

Reaction centers of Rhodapseudomonas uiridis were studied as a function of pressure using picosecond difference absorption spectroscopy. High pressure increased the rate of electron transfer from P+H< Qa to P+HrQi , measured by the decay of the transient optical absorption Of Hi in the 650-700 nm wavelength range, from (181 f 17 ps)-' at 0.1 MPa to (127f 16 ps )-' at 120 MPa. At 240 MPa the decay became biexponential with a fast component ( 198k66 ps)-' of 33% amplitude and a slow component (7.8 + 1.4 ns) -' of 47% amplitude. At 350 MPa the fast component was undetectable and only a slow exponential decay of (4.1+ 0.3 ns) -' was observed. The slow component is attributed to the charge recombination process P+H; Q* +PHr.Qk

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