Dr. Joachim Hämmerling ForMemRS[1] (9 March 1901 - 5 August 1980) was a pioneering Danish-German biologist funded by Nazi Germany who determined that the nucleus of a cell controls the development of organisms.
His experimentation with the green algae Acetabularia provided a model subject for modern cell biological research, and proved the existence of morphogenetic substances, or mRNP.
From 1949-1970 he served as the Director of the Max Planck Institute for Marine Biology, ultimately retiring in 1970.
[6] In his experiments, he removed the nucleus from a specific species of Acetabularia called A. crenulata and grafted it onto the cell of another a Acetabularia species called A. mediterranea, in which Hämmerling had removed specific parts of the organism.
[3] Because of his work with Acetabularia, when a new species of the plant was discovered in the Pacific Ocean in the 1970s, it was named after Hämmerling and called A.