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Wachstum und Stickstoff-Ausscheidung von Anabaena solitaria bei Züchtung in Süß­ wasser bzw. in Mischungen aus Süß-und Seewasser sowie unter Zusatz von Fe, Mn und Mo Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, II Growth and Nitrogen Excretion of Anabaena solitaria Grown in Freshwater and in Mixtures of Freshwater and Seawater, as Well as with Fe, Mn, and Mo Added to the Nutrient Medium Nitrogen Excretion, Nitrogen Fixing Blue-green Algae, Anabaena solitaria, Blue-green Algae The nitrogen fixing blue-green alga, Anabaena solitaria, was grown in freshwater and in mixtures of freshwater and seawater. Freshwater and a 5% mixture (95 volumes of freshwater and 5 volumes of seawater) proved to be most suitable: Growth (as expressed by the formation of chlorophylls; approx. 1.9 u g chlorophyll/ml) was comparatively high. The nitrogen content of the nutrient medium was increased to 750 - 760 //mol N/1. Upon addition of appropriate amounts of FeCl 3  , MnCl 2  , and Na 2 MoO 4  , the nitrogen content reached 1060 -1080//mol N /1, whereas the chlorophyll formation remained at approximately the same level. Thus Fe, Mn, and Mo appear to have a stimulating effect on nitrogen excretion by Anabaena solitaria. Under the conditions de­ scribed, this organism may be suitable for the mass production of algae.

zeitschrift für naturforschung c

Stickstoff-Ausscheidung durch N 2 -fixierende Blaualgen, II / Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, II: Wachstum und Stickstoff-Ausscheidung von Anabaena solitaria bei Züchtung in Süßwasser bzw. in Mischungen aus Süß- und Seewasser sowie unter Zusatz von Fe, Mn und Mo / Growth and Nitrogen Excretion of Anabaena solitaria Grown in Freshwater and in Mixtures of Freshwater and Seawater, as Well as with Fe, Mn, and Mo Added to the Nutrient Medium