1980
DOI: 10.1016/0014-5793(80)80139-6
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Electrochromic absorption changes of a chloroplast suspension induced by an external electric field

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Cited by 21 publications
(7 citation statements)
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“…The spectral shifts induced by illumination of the photosynthetic vesicles are believed by most workers to be genuine electrochromic shifts, i.e., to be due to electric field-induced changes in the transition moment of chromophore molecules (Junge, 1977;Witt, 1979;Schlodder and Witt, 1980). It has been shown that the carotenoids consist of two spectrally different pools, only the smaller of which shows a substantial shift upon energization of the membrane (Symons et ai, 1977;De Grooth et al, 1980).…”
Section: Electrochromic Shiftmentioning
confidence: 99%
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“…The spectral shifts induced by illumination of the photosynthetic vesicles are believed by most workers to be genuine electrochromic shifts, i.e., to be due to electric field-induced changes in the transition moment of chromophore molecules (Junge, 1977;Witt, 1979;Schlodder and Witt, 1980). It has been shown that the carotenoids consist of two spectrally different pools, only the smaller of which shows a substantial shift upon energization of the membrane (Symons et ai, 1977;De Grooth et al, 1980).…”
Section: Electrochromic Shiftmentioning
confidence: 99%
“…It has been shown that the carotenoids consist of two spectrally different pools, only the smaller of which shows a substantial shift upon energization of the membrane (Symons et ai, 1977;De Grooth et al, 1980). These carotenoids are located near and are polarized by membrane-associated charges (Symons et al, 1977;Sewe and Reich, 1977;Kakitani et al, 1982;De Grooth et al, 1980;Schlodder and Witt, 1980;Witt, 1979) which have been proposed to be in chlorophyll molecules (Sewe and Reich, 1977;Sherman and Clayton, 1972;Matsuura et al, 1980;Webster^ al., 1980). The use of electrochromic shift-related absorbance changes (usually at 518 or 478 nm) for the evaluation of transmembrane electrical fields is hampered by three types of limitations.…”
Section: Electrochromic Shiftmentioning
confidence: 99%
“…A29 reduces to Eq. A25 as in references (10,18,26 2X0Xi which again reduces to Eq. A25 for Am << (Ao, AX).…”
Section: (Al)mentioning
confidence: 99%
“…Therefore, with external electric field pulses of -1000 V/cm a field can be set up across the photosynthetic membrane at least as high as that induced by light (2*105 V cm-', section 3). The relative transmembrane potential difference induced by the external voltage can be followed directly with the quadratic component of the electrochromic absorption changes (see section 3) of the membrane pigments [43] (Fig. 6B).…”
Section: The Transmembrane Electrochemical Proton Potential As Drivinmentioning
confidence: 99%