Abstract
In 1828, Friedrich Wöhler obtained urea by heating ammonium cyanate, this being the first deliberate extracorporeal synthesis of an organic compound by man. A century passed before Krebs and Henseleit (1932) demonstrated the biosynthesis of urea by mammalian liver through a process they termed the “ornithine cycle”. It is fitting and historically instructive to note that between these two scientific achievements Salkowski (1877–78) provided the lead article in Hoppe-Seyler’s new journal, his Zeitschrift für physiologische Chemie’, “On the process of urea formation in animals and the influence on this by ammonium salts.” Now, somewhat more than a half-century since the discovery of the ornithine cycle, we are still working on the details of how it operates. This cycle, which we will refer to here as the ornithine-urea cycle (reasons for which will become evident later), has been, and continues to be, the framework for a legion of studies in comparative biochemistry and physiology.
I can make urea without the necessity of a kidney . . . Letter from Wöhler to Berzelius, Feb. 22, 1828 (Hurt, 1978).
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Brown, G.W., Brown, S.G. (1985). On Urea Formation in Primitive Fishes. In: Foreman, R.E., Gorbman, A., Dodd, J.M., Olsson, R. (eds) Evolutionary Biology of Primitive Fishes. NATO ASI Series, vol 103. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9453-6_17
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