دراسة الأيض النتروجيني لطحلب .Chlorella sp المعزول من شط العرب، البصرة، العراق

الملخص EN

Nitrogen metabolism of Chlorella sp., isolated from Shatt Al-Arab River, was studied for four days, in a nutrient media.

In this experiment, different sources of nitrogen were used, with or without different ketoacids (pyruvic acid,œ-ketoglutaric acid and oxaloacetic acid).

It was found that the Chlorella cells could absorb nitrate with pyruvic acid more than that of ammonia and urea with other ketoacids (œ-ketoglutaric acid and oxaloacetic acid).

No effect on N-absorbent or dry weight was observed during urea feeding with or without ketoacids.

The alga gives more yields when fed with ammonia, with or without pyruvic acid, than that of nitrate in the same conditions.

The nitrate media slightly turn to the acidity, the ammonia media turn to alkalinity, while no effect in case of urea.