Ammonium content, nitrogenase activity and heterocyst frequency within the leaf cavities of Azolla filiculoides Lam

The Acetylene-Ethylene Assay for N₂ Fixation: Laboratory and Field Evaluation

1968 • 2,209 citations

Nitrogen fixation hundred years after

1989 • 419 citations

Azolla: Botany, physiology, and use as a green manure

1980 • 342 citations

Nitrogen fixation hundred years after

1988 • 308 citations

Regulation of Expression of Nitrate and Dinitrogen Assimilation by Anabaena Species

1983 • 103 citations

Synthesis of nitrogenase and heterocysts by Anabaena sp. CA in the presence of high levels of ammonia

1979 • 43 citations

Azolla-Anabaena Relationship

1987 • 37 citations

THE AZOLLA‐ANABAENA AZOLLAE RELATIONSHIP

1981 • 30 citations

Oxygen concentration, nitrogenase activity and heterocyst frequency in the leaf cavities ofAzolla filiculoidesLam

1989 • 23 citations

Untersuchungen über Azolla und ihre Symbiose mit Blaualgen

1947 • 12 citations

Bacteria in the Azolla-anabaena association

1988 • 11 citations

Effects of Various Nitrogen Sources onNostoc Punctiforme(Kützing)

1979 • 9 citations