1. "Sciences reach a point where they become mathematized," he says, coining a new phrase. This process begins at the fringes, but, at some point, the central issues in the field become sufficiently understood that they can be thought about mathematically. It occurred in physics about the time of the Renaissance; it began in chemistry after John Dalton developed atomic theory; and it is just now happening in biology.... "When I was an undergraduate in the '60s," says Adleman, "I thought biology was stuff that smelled funny in the refrigerator. Now, biology is finite strings over a four-letter alphabet and functions performed by enzymes on these strings." -Leonard Adleman, co-inventor of RSA and originator of DNA-computing
2. "Physics is that part of natural science which can be described and analyzed in precise, mathematics language" - paraphrase of quote by Albert Einstein.
More seriously, a dramatic illustration of how not just the fields but the actual, effective definitions of scientific fields have changed radically in barely a half-century.
Main DNA Computing (page from 2000)