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ELECTRIC LINEAR DICHROISM OF P700 CHLOROPHYLL U‐PROTEIN COMPLEXES
Author(s) -
Gagliano A. G.,
Geacintov N. E.,
Breton J.,
Acker S.,
Remy R.
Publication year - 1979
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1979.tb07070.x
Subject(s) - absorbance , p700 , linear dichroism , electric field , polarizer , circular dichroism , exciton , chemistry , analytical chemistry (journal) , chlorophyll , aqueous solution , wavelength , dichroism , materials science , optics , crystallography , optoelectronics , physics , birefringence , photosystem i , condensed matter physics , photosystem ii , chromatography , photosynthesis , organic chemistry , biochemistry , quantum mechanics
— The P 700 chlorophyll a ‐protein complex (CPI) isolated from green plants was oriented in aqueous solutions using pulsed electric fields of up to 6700 V cm ‐1 . The electric linear dichroism spectrum is reported in the range of 400–720nm. Positive peaks in the linear dichroism Δ A = A I ‐ A 1 (where A I and A 1 are the absorbance components in which the polarizer orientation is parallel and perpendicular with respect to the electric field. respectively) are observed at 443 and 686 nm. The ΔA signal at 686 nm is discussed in terms of either a specialized chlorophyll form absorbing at 686 nm. or due to an exciton component absorbing at the same wavelength.