November 15, 1874|
|Died||September 13, 1949
|Institutions||University of Copenhagen|
|Known for||Krogh's principle|
|Influences||Christian Bohr, A. Bornstein|
|Influenced||Joseph Barcroft, Torkel Weis-Fogh|
|Notable awards||Nobel Prize in Physiology or Medicine|
Schack August Steenberg Krogh ForMemRS (November 15, 1874 – September 13, 1949) was a Danish professor at the department of zoophysiology at the University of Copenhagen from 1916 to 1945. He contributed a number of fundamental discoveries within several fields of physiology, and is famous for developing the Krogh Principle.
In 1920 August Krogh was awarded the Nobel Prize in Physiology or Medicine for the discovery of the mechanism of regulation of the capillaries in skeletal muscle. Krogh was first to describe the adaptation of blood perfusion in muscle and other organs according to demands through opening and closing the arterioles and capillaries.
He was born in Grenaa on the peninsula of Jutland in Denmark, the son of Viggo Krogh, a shipbuilder. He was educated at the Gymnasium Aarhus in Jutland. He attended the University of Copenhagen graduating MSc in 1899 and gaining a doctorate PhD in 1903.
Krogh was a pioneer in comparative physiology. He wrote his thesis on the respiration through the skin and lungs in frogs: Respiratory Exchange of Animals, 1915. Later Krogh took on studies of water and electrolyte homeostasis of aquatic animals and he published the books: Osmotic Regulation (1939) and Comparative Physiology of Respiratory Mechanisms (1941). He contributed more than 200 research articles in international journals. He was a constructor of scientific instruments of which several had considerable practical importance, e.g. the spirometer and the apparatus for measuring basal metabolic rate.
Krogh began lecturing in the University of Copenhagen in 1908 and in 1916 was promoted to full Professor becoming the head of the first laboratory for animal physiology (zoophysiology) at the university.
Krogh and his wife Marie brought insulin to Denmark shortly after its discovery in 1922 by Nicolae Paulescu. Marie, a doctor who had patients with type 1 diabetes, was herself suffering from type 2 diabetes and was naturally very interested in the disease. Together with a doctor, Hagedorn, August and Marie Krogh founded Nordisk Insulinlaboratorium, where Krogh made decisive contributions to establishing a Danish production of insulin by ethanol extraction of the hormone from the pancreatic glands of pigs.
In the 1930s, Krogh worked with two other Nobel prizewinners, the radiochemist George de Hevesy and the physicist Niels Bohr on the permeability of membranes to heavy water and radioactive isotopes, and together they managed to obtain Denmark's first cyclotron for experiments on animal and plant physiology, as well as in dental and medical work.
- The Respiratory Exchange of Animals and Man (1916)
- Osmatic Regulation in Aquatic Animals (1939)
- The Comparative Physiology of Respiratory Mechanisms (1941)
He married Marie Jorgenson in 1905.
August and Marie had four children, the youngest of whom, Bodil, was born in 1918. She too was a physiologist, and became the first woman president of the American Physiological Society in 1975.  Bodil married another eminent physiologist, Knut Schmidt-Nielsen.
Krogh's name is preserved in two items now named for him:
- Krogh length, the distance between capillaries which nutrients diffuse to, based on cellular consumption of the nutrients.
- Krogh's principle, that "for ... a large number of problems there will be some animal of choice, or a few such animals, on which it can be most conveniently studied."
- Larsen, E. H. (2001). "August Krogh and the laboratory of animal physiology situated at Ny Vestergade 11". Ugeskrift for laeger. 163 (51): 7240–7248. PMID 11797555.
- Kardel, T. (1999). "About the seven little devils who changed physiology. August and Marie Krogh on pulmonary gas exchange". Ugeskrift for laeger. 161 (51): 7112–7116. PMID 10647306.
- Schmidt-Nielsen, B. (1984). "August and Marie Krogh and respiratory physiology". Journal of applied physiology: respiratory, environmental and exercise physiology. 57 (2): 293–303. PMID 6381437.
- Poulsen, J. E. (1975). "The impact of August Krogh on the insulin treatment of diabetes and our present status". Acta medica Scandinavica. Supplementum. 578: 7–14. PMID 1098401.
- Dejours, P. (1975). "August Krogh and the physiology of respiration". Scandinavian journal of respiratory diseases. 56 (6): 337–346. PMID 769148.
- Kenez, J. (1965). "The Capillaries and Krogh". Orvosi hetilap. 106: 177–178. PMID 14275297.
- Krebs, H. A. (1975). "The August Krogh Principle: "For many problems there is an animal on which it can be most conveniently studied"". Journal of Experimental Zoology. 194 (1): 221–6. doi:10.1002/jez.1401940115. PMID 811756.
- Hill, A. V. (1950). "August Schack Steenberg Krogh. 1874-1949". Obituary Notices of Fellows of the Royal Society. 7 (19): 220. doi:10.1098/rsbm.1950.0014.
- Drinker, C. K. (1950). "August Krogh: 1874-1949". Science. 112 (2900): 105–107. doi:10.1126/science.112.2900.105. PMID 15442251.
- Liljestrand, G. (1950). "August Krogh". Acta Physiologica Scandinavica. 20 (2–3): 109–116. doi:10.1111/j.1748-1716.1950.tb00688.x. PMID 15413515.
- "Deaths of C. M. Wenyon, Clifford Dobell and A. Krogh". Comptes rendus des seances de la Societe de biologie et de ses filiales. 144 (3–4): 160–1. 1950. PMID 15420871.
- "August Krogh (1874-1949) the physiologist's physiologist". JAMA: the Journal of the American Medical Association. 199 (7): 496–497. 1967. doi:10.1001/jama.199.7.496. PMID 5335475.
- Hurst, J. W.; Fye, W. B.; Zimmer, H. G. (2006). "August Krogh". Clinical Cardiology. 29 (5): 231–233. doi:10.1002/clc.4960290514. PMID 16739398.
- Rehberg, P. B. (1951). "August Krogh, November 15, 1874-September 13, 1949". The Yale Journal of Biology and Medicine. 24 (2): 83–102. PMC . PMID 14901880.
- Larsen, E. H. (2007). "August Krogh (1874-1949): 1920 Nobel Prize". Ugeskrift for laeger. 169 (35): 2878. PMID 17877986.
- Sulek, K. (1967). "Nobel prize for August Krogh in 1920 for his discovery of regulative mechanism in the capillaries". Wiadomosci lekarskie (Warsaw, Poland : 1960). 20 (19): 1829. PMID 4870667.
- "August Krogh - Facts". Nobelprize.org. Retrieved 2 August 2016.
- "The Founders". www.novonordisk.com. Retrieved 2016-11-30.
- BIOGRAPHICAL INDEX OF FORMER FELLOWS OF THE ROYAL SOCIETY OF EDINBURGH 1783 – 2002 (PDF). The Royal Society of Edinburgh. July 2006. ISBN 0 902 198 84 X.
- "George de Hevesy: Explosion of new knowledge". Niels Bohr Institute. Retrieved 2 August 2016.
- "The Founders". Novo Nordisk. Retrieved 2 August 2016.
- Dantzler, William H. (July 2015). "Obituary Bodil Schmidt-Nielsen (1918-2015) 48th APS President". Retrieved December 17, 2015.
- Living history of physiology: Bodil Schmidt-Nielsen (Prof. William Dantzler. University of Arizona) 
- 48th APS President (1975-1976)Bodil M. Schmidt-Nielsen (American Physiological Society) "Archived copy". Archived from the original on 2009-11-21. Retrieved 2009-11-03.
- Krogh, August; Weis-Fogh, Torkel (1951). "The Respiratory Exchange of the Desert Locust (Schistocerca Gregaria) before, During and After Flight". Journal of Experimental Biology. The Company of Biologists. 28 (3): 344–357.
- Fournier, R. L. Basic Transport Phenomena in Biomedical Engineering. Taylor & Francis, London, 1999.
- Choi et al. Microfluidic scaffolds for tissue engineering. Nature Materials (2007) vol. 6 pp. 908-915
- Bernard, Claude. Introduction à l'étude de la médecine expérimentale, J.B. Baillière et Fils, Libraires de L'Académie Impériale de Médecine, 1865. pp. 400
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