The full name of these two Scientists is Matthew Meselson and Franklin Stahl they were from the California Institute of technology, they are well known for performing an experiment in 1958, which proved the hypothesis of Watson and Crick in which DNA replicated itself by opening up the double helix without coming completely apart and that it was Semi conservative (Holmes, 2001).
What Semi conservative mean is one strand of DNA is used as the template which is usually 15N indicated by the color red for replicating the other DNA strand 14N which is usually blue, using only half the DNA is what makes it Semi conservative (Macy, 2002).
The experiment was Bacterium E.Coli was grown around radioactive 15N until the DNA was all 15N. Because they