At what time intervals did Meselson and Stahl | vedclass

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(C) Meselson and Stahl performed an experiment to prove semi-conservative $DNA$ replication. They grew $E. coli$ in a medium containing $^{15}N$ (a he

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(C) Meselson and Stahl performed an experiment to prove semi-conservative $DNA$ replication. They grew $E. coli$ in a medium containing $^{15}N$ (a heavy isotope of nitrogen) for many generations to label the $DNA$. Then, they transferred these bacteria into a medium containing $^{14}NH_{4}Cl$ (a normal isotope of nitrogen). Since $E. coli$ divides every $20$ minutes, they took samples at definite time intervals of $20$ minutes to analyze the density of the $DNA$ using cesium chloride $(CsCl)$ density gradient centrifugation.

At what time intervals did Meselson and Stahl take samples after transferring the bacteria to a $^{14}NH_{4}Cl$ medium?

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