|Died||10 June 1900 (aged 63)|
|Alma mater||University of Göttingen|
|Known for||Coining the word "enzyme"|
Discovery of trypsin
|Fields||Physiology, Physiological chemistry|
|Institutions||University of Berlin|
University of Amsterdam
University of Heidelberg
|Doctoral advisor||Rudolph Wagner|
|Other academic advisors||Friedrich Wöhler|
|Doctoral students||Russell Chittenden|
Kühne was born at Hamburg on 28 March 1837. After attending the gymnasium in Lüneburg, he went to Göttingen, where his master in chemistry was Friedrich Wöhler and in physiology Rudolph Wagner. Having graduated in 1856, he studied under various famous physiologists, including Emil du Bois-Reymond at Berlin, Claude Bernard in Paris, and KFW Ludwig and EW von Brücke in Vienna.
At the end of 1863 he was put in charge of the chemical department of the pathological laboratory at Berlin, under Rudolf Virchow; in 1868 he was appointed professor of physiology at Amsterdam; and in 1871 he was chosen to succeed Hermann von Helmholtz in the same capacity at Heidelberg, where he died on 10 June 1900.
Kühne's original work falls into two main groups, the physiology of muscle and nerve, which occupied the earlier years of his life, and the chemistry of digestion, which he began to investigate while at Berlin with Virchow. In 1876, he discovered the protein-digesting enzyme trypsin.
He was also known for his research on vision and the chemical changes occurring in the retina under the influence of light. Using the "visual purple" (or rhodopsin), described by Franz Christian Boll in 1876, he attempted to make the basis of a photochemical theory of vision, but though he was able to establish its importance in connection with vision in light of low intensity, its absence from the retinal area of most distinct vision detracted from the completeness of the theory and precluded its general acceptance. Kühne also pioneered the process of optography, the generation of an image from the retina of a rabbit by applying a chemical process to fix the state of the rhodopsin in the eye. Later, Kühne attempted his technique on the eye of a convicted murderer from Bruschal, Germany with inconclusive results. 
Some notable students
Ida Henrietta Hyde (1857–1945) wanted to study physiology under Kühne at the University of Heidelberg on the recommendation of Professor Alexander Goette at Strasbourg. The University accepted her, but Willhelm Kühne refused to allow her in lectures and laboratories. He is reported to have said that he would never allow “skirts” in his classes. However, when a colleague asked him whether, if at the end of the course she could pass the examination, he would grant her the degree, he jokingly replied that he would. And so for six semesters, she had to study physiology independent of the classroom and of hands-on laboratory projects, using only his assistants’ notes and lab sketches. Finally, a four-hour oral examination by Kühne’s academic committee, proved her worthiness. The “Summa Cum Laude” degree, the highest honors, could not go to a woman, so Kühne invented a new phrase: “Multa Cum Laude Superavit" in English meaning “she overcame with much praise.”
Hyde completed the PhD at Heidelberg in 1896, the first woman to receive one for this type of work. Kühne recommended her for a position at the Heidelberg-supported research program at the Naples Marine Biological Laboratory in Naples Italy, where she studied the nature and function of salivary glands. She was a life member of this organization, and its secretary from 1897 to 1900.
- Kühne 1877, p. 190.
- Kühne (1877), p. 190: "Um Missverständnissen vorzubeugen und lästige Umschreibungen zu vermeiden schlägt Vortragender vor, die ungeformten oder nicht organisirten Fermente, deren Wirkung ohne Anwesenheit von Organismen und ausserhalb derselben erfolgen kann, als Enzyme zu bezeichnen."
Translation : In order to avoid misunderstandings and cumbersome circumlocutions, the presenter proposes to designate as "enzymes" the unformed or not organized ferments, whose action can occur without the presence of organisms and outside of the same.
- Chisholm 1911, p. 942.
- Kühne 1877, pp. 194–198.
- Daintith, John (2010): Biographical Encyclopedia of Scientists, Third Edition
- Lanska DJ: Optograms and criminology: science, news reporting, and fanciful novels. Prog Brain Res. 2013;205:55-84. doi: 10.1016/B978-0-444-63273-9.00004-6.>
- Dingman M. Know Your Brain: Telencephalon. Neuroscientifically Challenged. http://www.neuroscientificallychallenged.com/blog/know-your-brain-telencephalon. Published July 7, 2017. Accessed April 8, 2019.
- Kühne, Wilhelm (1877). "Über das Verhalten verschiedener organisirter und sog. ungeformter Fermente" [On the behavior of various organized and so-called unformed ferments]. Verhandlungen des naturhistorisch-medicinischen Vereins zu Heidelberg. Neue Folge [new series] (in German). Heidelberg. 1: 190–193.
- Media related to Wilhelm Friedrich Kühne at Wikimedia Commons
- "Biography and bibliography in the Virtual Laboratory of the Max Planck Institute for the History of Science". Retrieved 18 December 2005.