title: Photosynthetic electron carriers at a heptane-water interface.
abstract: Surface properties of monomolecular films of chlorophyll (Chl), plastocyanin (Pc), cytochrome c (Cyt) and ferridoxin (Fd) were measured at a heptane-water interface. Mixed films of Chl and the other components were examined in darkness and in light. The area/molecule, A, for Fd (from Cl. pasteurianum) is much larger at a heptane-water than Fd (from spinach) at an air-water interface. This difference in A may be the source of the Fd or the extent of denaturation at the different interfaces. There appears to be a photoreaction between Chl and Fd in the presence of ascorbate. The A for Cyt is much larger at a heptane-water than at an air-water interface. In mixed films there is a strong interaction between Chl and reduced Cyt in the dark. No such interaction is observed between Chl and oxidized Cyt. With mixed films of Chl and reduced Pc there is a significant, reversible, light induced change in deltaV.
mesh_terms: D000473:Alkanes; D001205:Ascorbic Acid / Q000494:pharmacology; D002734:Chlorophyll / Q000378:metabolism*; D003574:Cytochrome c Group / Q000378:metabolism*; D004579:Electron Transport; D005288:Ferredoxins / Q000378:metabolism*; D007501:Iron / Q000494:pharmacology; D008027:Light; D008567:Membranes, Artificial; D010788:Photosynthesis; D010940:Plant Proteins / Q000378:metabolism*; D010970:Plastocyanin / Q000378:metabolism*; D013499:Surface Properties; D013696:Temperature; D014867:Water
chemical_list: D000473:Alkanes; D003574:Cytochrome c Group; D005288:Ferredoxins; D008567:Membranes, Artificial; D010940:Plant Proteins; D014867:Water; D002734:Chlorophyll; D010970:Plastocyanin; D007501:Iron; D001205:Ascorbic Acid