Question
A certain reagent is added to a suspension of cells of 4 m in diameter. These cells have a density of 1.08 g/cm3, and they
A certain reagent is added to a suspension of cells of 4 m in diameter. These cells have a density of 1.08 g/cm3, and they are suspended in liquid with a density of 1 g/cm3 and viscosity of 1 cp. This reagent causes about half of the cells to form fairly solid aggregates, all of which are 90 m in diameter and have density midway between that of the liquid and the cells. How much time is required for all the aggregates to sediment within 1 cm of the bottom of a vessel filled with suspension that is 0.5 m high? Approximately what fraction of the single cells would have sedimented to this depth in the same amount of time? How much time is required for all the single cells to sediment to within 1 cm of the bottom of the vessel?
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