Sidney Q. Cohlan (1915-1999)

By Bianca Zietal, Chanapa Tantibanchachai
Published: 2017-06-18
Keywords: Birth defects, teratology

Sidney Q. Cohlan studied birth defects in the US during the twentieth century. Cohlan helped to discover that if a pregnant woman ate too much vitamin A her fetus faced a higher than normal risk of teratogenic effects, such as cleft palate. A teratogen is a substance that causes malformation of a developing organism. Cohlan also identified the teratogenic effects of several other substances including a lack of normal magnesium and prenatal exposure to the antibiotic tetracycline. Cohlan's experiments with vitamins and other chemicals brought attention to how nutrition and environmental agents adversely affect human pregnancy outcomes.

How to cite

Zietal, Bianca,, Tantibanchachai, Chanapa, "Sidney Q. Cohlan (1915-1999)". Embryo Project Encyclopedia (2017-06-18). ISSN: 1940-5030

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Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia.


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Monday, June 19, 2017 - 03:09




Hypervitaminosis A; Prenatal Nutritional Physiological Phenomena; Abnormalities, Human; Retinoids; Vitamin A; Hypervitaminosis; Teratology Society; Tetracycline; Tetracyclines; Malformations; Wilson, James G. (James Graves), 1915-; Warkany, Josef, 1902-; New York University. School of Medicine; People