The initial organic products of fixation of 13N-labeled nitrogen gas by the blue-green alga Anabaena cylindrica

1975 ◽  
Vol 67 (2) ◽  
pp. 501-507 ◽  
Author(s):  
Joseph Thomas ◽  
C. Peter Wolk ◽  
Paul W. Shaffer ◽  
Sam M. Austin ◽  
Aaron Galonsky
Keyword(s):  
Green Alga ◽  
Blue Green Alga ◽  
Anabaena Cylindrica ◽  
Nitrogen Gas ◽  
Organic Products

scholarly journals AUTORADIOGRAPHIC LOCALIZATION OF 13N AFTER FIXATION OF 13N-LABELED NITROGEN GAS BY A HETEROCYST-FORMING BLUE-GREEN ALGA

1974 ◽  
Vol 61 (2) ◽  
pp. 440-453 ◽  
Author(s):  
C. Peter Wolk ◽  
Sam M. Austin ◽  
John Bortins ◽  
Aaron Galonsky
Keyword(s):  
Green Alga ◽  
N2 Fixation ◽  
Blue Green Alga ◽  
Anabaena Cylindrica ◽  
Proton Bombardment ◽  
Nitrogen Gas ◽  
Autoradiographic Technique ◽  
Track Autoradiography

13N, generated by proton bombardment of 13C powder, is rapidly and easily converted to 13N-N2, 0.01 atm pressure, ca. 10 mCi/ml, by automated Dumas combustion. 13N fixed (as 13N-N2) by algal filaments was localized by an autoradiographic technique which permits track autoradiography with isotopes having short half-lives. Our findings show directly that a minimum of about 25% of the N2 fixation by intact, aerobically grown filaments of Anabaena cylindrica is carried out by the heterocysts. If all of the N2 fixation takes place in the heterocysts, then the movement of nitrogen along the filaments can be characterized by a constant τ < ca. 5 s (cell-2).

A POLYSACCHARIDE FROM THE BLUE-GREEN ALGA, ANABAENA CYLINDRICA

1954 ◽  
Vol 32 (11) ◽  
pp. 999-1004 ◽  
Author(s):  
C. T. Bishop ◽  
G. A. Adams ◽  
E. O. Hughes
Keyword(s):  
Acid Hydrolysis ◽  
Fresh Water ◽  
Green Alga ◽  
Culture Medium ◽  
Glucuronic Acid ◽  
Molar Ratio ◽  
Blue Green Alga ◽  
Anabaena Cylindrica ◽  
Chemical Homogeneity ◽  
Fresh Water Alga

A complex polysaccharide has been isolated from the fresh-water alga, Anabaena cylindrica, grown in a synthetic culture medium. Prolonged acid hydrolysis yielded glucose, xylose, glucuronic acid, galactose, rhamnose, and arabinose in a molar ratio of 5: 4: 4: 1: 1: 1. Chemical fractionations of the polysaccharide material from solution in cupriethylenediamine, and of its acetate from organic solvents indicated chemical homogeneity.

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