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The death phase for a batch culture started at time = 170 h at a cell mass concentration of 10 g/l. At time = 190

The death phase for a batch culture started at time = 170 h at a cell mass concentration of 10 g/l. At time = 190 h, the cell mass concentration was down to 5 g/l. What is the specific death rate (kd) in this exponential death phase?

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