Skip to main content. Engineered for applications in high-use, high-abuse situations, Corbin Russwin exit devices can be teamed with a variety of trims to provide desired functions, styles and finishes in new construction and renovations.
The discovery of DNA focused scientists' efforts and led to the research into genetics and heredity aimed at improving life on Earth today. Identification of DNA DNA's discovery can be traced to 1868, when Swiss medical student Johann Friedrich Miescher began work on isolating proteins from white blood cells.
Concept 15 DNA and proteins are key molecules of the cell nucleus. In 1869, Friedrich Miescher isolated nuclein, DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.