Differential Sensitivity to 30 Herbicides Among Populations of Two Green Algae Scenedesmus obliquus and Chlorella pyrenoidosa

2002 ◽  
Vol 68 (2) ◽  
pp. 275-281 ◽  
Author(s):  
J. Ma
Keyword(s):  
Green Algae ◽  
Scenedesmus Obliquus ◽  
Chlorella Pyrenoidosa ◽  
Differential Sensitivity

Inactivation and Reactivation of the Hydrogenases of the Green Algae Scenedesmus obliquus and Chlamydomonas reinhardtii

1993 ◽  
Vol 48 (1-2) ◽  
pp. 41-45 ◽  
Author(s):  
Thomas Urbig ◽  
Rüdiger Schulz ◽  
Horst Senger
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Green Algae ◽  
Scenedesmus Obliquus ◽  
Sodium Dithionite ◽  
Anaerobic Conditions ◽  
Whole Cells ◽  
Complete Inactivation

The hydrogenases of the green algae Scenedesmus obliquus and Chlamydomonas reinhardtii were activated under anaerobic conditions. Exposure of whole cells and cell-free homogenates to air lead to a complete inactivation of the hydrogenases. The inactivation in whole cells of Scenedesmus is faster than the inactivation of the cell-free homogenate. Inactivation of the hydrogenases could be reversed by anaerobic readaptation in whole cells. The inactivation of the hydrogenase in homogenates seems to be irreversible. Neither the removal of oxygen nor the addition of ATP, NAD(P)H, sodium dithionite, dithiothreitol, ferredoxin and thioredoxin to homogenates facilitated the reactivation of the hydrogenase. The occurrence of a hydrogenase regulating factor is discussed.

Bleomycin-Iron Complex and Oxygen Activate Algal Ribonucleotide Reductase

1985 ◽  
Vol 40 (11-12) ◽  
pp. 919-921 ◽  
Author(s):  
Rüdiger Hofmann ◽  
Hartmut Follmann
Keyword(s):  
Green Algae ◽  
Ribonucleotide Reductase ◽  
Scenedesmus Obliquus ◽  
Iron Complex ◽  
Mechanistic Studies ◽  
Anaerobic Conditions

Abstract Ribonucleotide reductase of green algae (Scenedesmus obliquus) is a radical-containing enzyme which rapidly loses activity under anaerobic conditions. Reactivation in the presence of air is enhanced by 10 μᴍ iron(II)-bleomycin chelate. The reaction lends new biochemical potential to the antibiotic and should be valuable in mechanistic studies of ribonucleotide reduction.

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