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Heterocysts are formed abundantly in cultures of Anabaena flos-aquaeA-37 which are fixing nitrogen. Fewer are formed in the presenceof NO3 ions, whereas none occurred in the presence ofNH4+ ions. The results indicate that heterocysts may have arole in nitrogen metabolism. 相似文献
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Anabaena flos-aquae A-37 was grown in bacteria-free cultureon a variety of nitrogen sources. Extracellular polysaccharideproduction was found to be a part of the normal metabolic processescausing the liberation of excess carbohydrates into the surroundingmedium rather than the result of cellular lysis. Non-adaptedcells supplied with NH4Cl produced abundant polysaccharide.However, the population did not increase. Cells adapted to NH4Clproduced smaller quantities of polysaccharide, but the populationdid increase. Polysaccharide production per cell was similaron Mg(NO3)2, KNO3, NaN03, NH4NO3, and NH4Cl. It was concludedthat an adequately utilized nitrogen source does not affectpolysaccharide production in A. flos-aquae A-37. 相似文献
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