Albrecht Kossel — German Scientist born on September 16, 1853, died on July 05, 1927

Ludwig Karl Martin Leonhard Albrecht Kossel was a German biochemist and pioneer in the study of genetics. He was awarded the Nobel Prize for Physiology or Medicine in 1910 for his work in determining the chemical composition of nucleic acids, the genetic substance of biological cells... (wikipedia)

The living cell almost always contains, locked in its interior, the visible or invisible products of its physiological activity or its nourishment.
The more the relationships of the nitrogen-rich substances to the cell nucleus were recognized, the more the question of the arrangement of the nitrogen and carbon atoms in the molecule came to stand out.