A strain of Azotobacter vinelandii is cultured in a 15 m3 stirred fermenter for alginate production. Under current operating conditions kLa is 0.17 s-1. Oxygen solubility in the broth is approximately 8 x 10-3 kg m-3. The specific rate of oxygen uptake is 12.5 mmol g-1 h-1. What is the maximum possible cell concentration?
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