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Extracellular invertase activity. Inocula from X. dendrorhous ATCC MYA-131 were grown (⋄) in 250-ml flasks containing 50 ml of MMM. The invertase activity was measured in 0.01 ml of culture filtrates at the times indicated using sucrose (▴) as the substrate. Each point represents the average of three independent measurements with a standard deviation of ±5%. Similar results were obtained for two other different cultures (data not shown).
