Zur Kenntnis der Assimilationshemmung nach Sauerstoffentzug bei Gr�nalgen

Noack, Kurt; Pirson, André; Michels, H.

doi:10.1007/bf01495167

Cited by 14 publications

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“…We know now that the turnback from photoreduction to normal photosynthesis and to aerobic conditions under the influence of excess light is FzG. 19. Effect of M/800 hydroxylamine on the oxyhydrogen reaction (CO~ present).…”

Section: Oxyhydrogen Reaction Inalgaementioning

confidence: 99%

Reduction of Carbon Dioxide Coupled With the Oxyhydrogen Reaction in Algae

Gaffron

1942

Journal of General Physiology

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1. Unicellular algae possessing a hydrogenase system (Scenedesmus and other species), and having been adapted by anaerobic incubation to the hydrogen metabolism, reduce oxygen to water according to the equation O2 + 2H2 → 2H2O. 2. The oxyhydrogen reaction proceeds undisturbed only in the presence of carbon dioxide, which simultaneously is reduced according to the equation CO2 + 2H2 → H2O + (CH2O) = (carbohydrate). 3. The maximum yield of the induced reduction is one-half molecule of carbon dioxide reduced for each molecule of oxygen absorbed. 4. Partial reactions are recognizable in the course of the formation of water and it is with the absorption of the second equivalent of hydrogen that the carbon dioxide reduction appears to be coupled. 5. The velocity of the reaction increases in proportion to the partial pressure of oxygen, but only up to a certain point where any excess of oxygen causes the inactivation of the hydrogenase system. The reaction then ends prematurely. 6. During the oxyhydrogen reaction little or no oxygen is consumed for normal respiratory processes. 7. Small concentrations of cyanide, affecting neither photosynthesis nor photoreduction in the same cells, first inhibit the induced reduction of carbon dioxide and then lead to a complete inactivation of the hydrogenase system. 8. Hydroxylamine, added after adaptation, has either no inhibitory effect at all, or prevents solely the induced reduction of carbon dioxide without inactivating the hydrogenase system. 9. Dinitrophenol prevents the dark reduction of carbon dioxide while the reduction of oxygen continues to the formation of water. 10. Glucose diminishes the absorption of hydrogen, probably in its capacity as a competing hydrogen donor. 11. The induced reduction of carbon dioxide can be described as an oxido-reduction similar to that produced photochemically in the same cells.

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Section: Oxyhydrogen Reaction Inalgaementioning

confidence: 99%

Reduction of Carbon Dioxide Coupled With the Oxyhydrogen Reaction in Algae

Gaffron

1942

Journal of General Physiology

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“…Inspired by Willst~itter's classical texts and by H. von Tappeiner's investigations (1909) on fluorescent photodynamic dyes, he began to look at the photooxidative effects of chlorophyll in leaves, including its selfdestruction. Later, long before Mehler's concept became known (Mehler 195 l), it turned out that anaerobic conditions could not prevent Chlorella from starting photosynthesis if acid products of fermentation were neutralized (Noack et al 1939;Michels 1940). Based upon numerous observations and experiments, Noack proposed that a (reversible) anthocyanin formation diverts energy collected by chlorophyll in undeveloped or inactive photosynthetic structures (e.g., in cold-stressed or in juvenile green tissues) to anthocyanin precursors, thus protecting chlorophyll and photosynthesis from photooxidative damage.…”

Section: Kurt Noack and His Laboratory From 1931 To 1945mentioning

confidence: 99%

Sixty years in algal physiology and photosynthesis

Pirson¹

1994

Photosynth Res

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This personal perspective records research experiences in chemistry and biology at four German universities, two before and two after World War II. The research themes came from cytophysiology of green unicellular algae, in particular their photosynthesis. The function of inorganic ions in photosynthesis and dark respiration was investigated at different degrees of specific mineral stress (deficiencies), and the kinetics of recovery followed after the addition of the missing element. Two types of recovery of photosynthesis were observed: indirect restitution via growth processes and immediate normalisation. From the latter case (K(+), phosphate, Mn(++)) the effect of manganese was emphasized as its role in photosynthetic O2 evolution became established during our research. Other themes of our group, with some bearing on photosynthesis were: synchronization of cell growth by light-dark change and effects of blue (vs. red) light on the composition of green cells. Some experiences in connection with algal mass cultures are included. Discussion of several editorial projects shows how photosynthesis, as an orginally separated field of plant biochemistry and biophysics, became included into general cell physiology and even ecophysiology of green plants. The paper contains an appreciation of the authors' main mentor Kurt Noack (1888-1963) and of Ernst Georg Pringsheim (1881-1970), founder of experimental phycology.

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Studies on the Induction Period of Photosynthesis and Light Respiration in Green Algae

Gaffron

1940

American J of Botany

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Zur Kenntnis der Assimilationshemmung nach Sauerstoffentzug bei Gr�nalgen

Cited by 14 publications

References 1 publication

Reduction of Carbon Dioxide Coupled With the Oxyhydrogen Reaction in Algae

Reduction of Carbon Dioxide Coupled With the Oxyhydrogen Reaction in Algae

Sixty years in algal physiology and photosynthesis

Studies on the Induction Period of Photosynthesis and Light Respiration in Green Algae

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