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Algae comprise a large group of Thallophyta, which may be used as direct nutrition of human beings.  Molasses is the by-product of the sugar manufacturing facility. In this study, a locally isolated Scendsmus quadricauda from the environment of Mosul in the Shalalat region was obtained. Biomass of Scenedsmus was measurement by carried out and filtration then drying in an oven for 24 h and weighed, Estimation of chlorophyll and protein and carbohydrate content of Scenedsmus. The research has proved that the best growing period for Scendsmue quadricauda is 15 days when using sugar factory waste as a carbon source, the growth reached (1.42 nm) as optical density, biomass (1525 mg /L), chlorophyll (green), pigment (18 mg /l) protein content (396 mg /l ) and carbohydrates ( 501 mg / l ). The research showed that the use of sugar factory waste as a nutritional medium for algal growth in the dark (11.5%) achieved good growth of Scendesmues quadricauda ( 0.632 nm), biomass (820 mg / L), green pigment  (Chlorophyll) (18 mg /L) protein content (235 mg / L ) and carbohydrates (401 mg/L). while using phosphor (0.018%) of K2HPO4 in dark medium achieved highest growth rate  (0.91 nm) , biomass (1110 mg / L) chlorophyll ( 22 mg/L) protein (301mg/L) and carbohydrate (461 mg/L) . It is noted too , that using IAA (0.5 g/L) in dark medium support best growth (0.888 nm) , biomass (1010 mg/L) chlorophyll (25 mg/L) , protein (230mg/L) and carbohydrate (440 mg//L) . The study showed that thiamine (1 g/L) in dark medium achieved highest growth (0.750 nm) biomass (218 mg/L), chlorophyll (29mg/L), protein (220 mg/L), carbohydrate (340mg/L). Therefore, using Molasses can enhance the growth, biomass,  chlorophyll, protein, and carbohydrate content in the S. quadricauda.

Molasses as a new nutrition medium for Scenedsmus quadricauda growth and production of some bio compounds