Organic tracers

The body is a "black box" in the sense that we know that food and air goes in, and waste products come out, but it is very difficult to understand the metabolism that happens in-between. Benzene rings were used as tracers to study intermediate metabolism in the body.
 Franz Knoop Germany 1904 Organic tracers

The body is a "black box" in the sense that we know that food and air goes in, and waste products come out, but it is very difficult to understand the metabolism that happens in-between. Benzene rings were used as tracers to study intermediate metabolism in the body.