THE QUALITY OF PROTEINS FROM CHLORELLA-VULGARIS AND SCENEDESMUS-OBLIQUUS CULTIVATED IN INTERMITTENT LIGHT ON MODEL NITROGEN-FERTILIZER PLANT WASTE-WATER

Two sources of nitrogen were used - ammonium and urea. When intermitte nt light was applied, a smaller increase in dry weight was observed th an under constant illumination. It brought about a simultaneous decrea se in protein content. In all investigated variants of illumination a much more significant protein content was obtained on urea than on amm onium. The highest amount of essential amino acids was obtained with c onstant illumination. Shortening of the light phase and elongation of the dark period was found to result in decrease of essential amino aci ds, except for phenylalanine. The intermittent light cycle 21:3, in Ch lorella vulgaris cultivated on ammonium had a much more unfavorable ef fect on the quantity of essential amino acids than 15:9. Scenedesmus o bliquus was characterized by higher production of all examined essenti al amino acids in cycle 15:9 than with 21:3 (except for leucine and ph enylalanine).