Their experiment, known as the Meselson-Stahl experiment, used density gradient centrifugation to track the replication of DNA in *E. coli*. They used heavy isotopes of nitrogen (N15) to label the original DNA and then switched to a medium with lighter nitrogen (N14). By observing the density of the replicated DNA over multiple generations, they were able to prove that DNA replication occurs through a semi-conservative mechanism, meaning each new DNA molecule consists of one parental strand and one newly synthesized strand.
However, it's important to acknowledge that other researchers played crucial roles in laying the foundation for this discovery. For example:
* Alfred Hershey and Martha Chase (1952) demonstrated that DNA, not protein, is the genetic material.
* Erwin Chargaff (1950) discovered the base pairing rules of DNA.
* James Watson and Francis Crick (1953) proposed the double helix structure of DNA.
These discoveries, along with the work of many other scientists, contributed to the understanding of DNA replication. The Meselson-Stahl experiment provided definitive proof of the semi-conservative mechanism, solidifying our understanding of this fundamental biological process.
