Abstract
Fatty acid spin labels containing nitroxide groups at different positions in the fatty acid chain have been incorporated into lipid vesicles. Changes in esr parameters of the spin labels in the presence in the membrane of phytol, propionic acid phytol ester or chlorophyll a and the kinetics of chlorophyll a mediated photodestruction of the spin labels suggest a localization of the macrocyclic ring of the chlorophyll molecule in the polar head group region of the membrane.
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