Stoffwechsel organischer Verbindungen I. Photosynthese

Inhibitors in the functional dissection of the photosynthetic electron transport system

“…The so called ''photoreduction'', i.e. the reduction of CO 2 at the expense of hydrogen in hydrogenase adapted algae (Gaffron 1940), was not inhibited by DCMU, resembling the phototoreduction of manganese in Mn-depleted algae (Pirson 1937), Mn is since known to be involved in oxygen evolution. Cyclic photophosphorylation, as discovered by Arnon et al (1954) was found by Jagendorf and Avron (1959) neither to be inhibited by DCMU, nor was the first artificial donor system for NADP reduction-DCPIP/ascorbate (Vernon and Zaugg 1960).…”

Structural oxidation state studies of the manganese cluster in the oxygen evolving complex of photosystem II

“…Depletion of manganese in plants or algae results in the loss of oxygen evolution capability. This activity can be restored within 30 min upon the addition of Mn2+ to the growth media (Pirson, 1937). Light is also required along with Mn2+ to recover oxygen evolution activity in Mn-deficient algae (Kok & Cheniae, 1966;Ross & Calvin, 1967).…”

1. Hans‐Adolf von Stosch: Form und Formwechsel der Diatomee Achnantes longipes in Abhängigkeit von der Ernährung. Mit besonderer Berücksichtigung der Spurenstoffe

“…Diese Storungsquelle ist nach den Erfahrungen der letzten Jahre iiber den Bedarf der hoheren Pflanzen, Pilze und Tiere an Spurenelementen besonders in Betracht zu ziehen. Fiir Algen haben HOPKINS (1934) sowie PIRSON (1937PIRSON ( , 1940 (Fig. 4, 5).…”