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Leonor Michaelis

Leonor Michaelis
Leonor Michaelis.jpg
Born (1875-01-16)16 January 1875
Berlin, German Empire
Died 8 October 1949(1949-10-08) (aged 74)
New York City, United States
Nationality German

Leonor Michaelis (January 16, 1875 – October 8, 1949) was a German biochemist, physical chemist, and physician, known primarily for his work with Maud Menten on enzyme kinetics and Michaelis–Menten kinetics in 1913.

Leonor Michaelis was born in Berlin, Germany on January 16, 1875 and graduated from the humanistic Koellnisches Gymnasium in 1893 after passing the Abiturienten Examen. It was here that Michaelis’ interest in physics and chemistry was first sparked as he was encouraged by his teachers to utilize the relatively unused laboratories at his school.

With concerns about the financial stability of a pure scientist, he commenced his study of medicine at Berlin University in 1893. Among his instructors were Emil du Bois-Reymond for physiology, Emil Fischer for chemistry, and Oscar Hertwig for histology and embryology.

During his time at Berlin University, Michaelis worked in the lab of Oscar Hertwig, even receiving prize for a paper on the histology of milk secretion. Michaelis’s doctoral thesis work on cleavage determination in frog eggs led him to write a textbook on embryology. Through his work at Hertwig’s lab, Michaelis came to know Paul Ehrlich and his work on blood cytology; he worked as Ehrlich’s private research assistant from 1898 to 1899.

He passed his physician’s examination in 1896 in Freiburg, and then moved to Berlin, where he received his doctorate in 1897. After receiving his medical degree, Michaelis worked as a private research assistant to Moritz Litten (1899–1902) and for Ernst Viktor von Leyden (1902–1906).


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