August Krogh

Schack August Steenberg Krogh ForMemRS^[2] (November 15, 1874 – September 13, 1949) was a Danish professor at the department of zoophysiology at the University of Copenhagen from 1916 to 1945.^[3][4][5] He contributed a number of fundamental discoveries within several fields of physiology, and is famous for developing the Krogh Principle.^[6][7][8]

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.^[9][10] 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.^[11]

Besides his contributions to medicine, Krogh was also one of the founders of what is today Novo Nordisk.^[12]

Career

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 was the head of the first laboratory for animal physiology (zoophysiology) at the University of Copenhagen.^[13]

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.^[14] 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.^[14]

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.^[13]

Family

Much of Krogh's work was carried out in collaboration with his wife, Marie Krogh (1874–1943), a renowned scientist in her own right.^[11]

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. ^[15] Bodil married another eminent physiologist, Knut Schmidt-Nielsen.^[16][17]

Legacy

Torkel Weis-Fogh, an eminent pioneer on the study of insect flight, was a student of August Krogh's. Together they wrote a classic paper on that subject in 1951.^[18]

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.^[19][20]
• 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."^[21]

Further reading

• 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. 

References

External links

Wikiquote has quotations related to: August Krogh

• August Krogh biography on Nobel Prize website