Kassner, R J The photoreduction of spinach ferredoxin in the presence of porphyrin and an electron donor. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Dec 1967 - 2445-50 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.58.6.2445 doi Subjects--Topical Terms: Ascorbic Acid--physiologyChloroplasts--metabolismFerredoxins--metabolismLightOxidation-ReductionOxygen--pharmacologyPlants--metabolismPorphyrins--physiologySpectrophotometry