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Leonardo da Vinci's Embryological Annotations
By: Hilary Gilson
| Published: Aug 19, 2008
Among his myriad scientific and artistic contributions, Leonardo da Vinci's work in embryology was groundbreaking. He observed and diagramed the…
LiteratureLeonardo, da Vinci, 1452-1519Human DevelopmentPublicationsFetus
George Wells Beadle (1903-1989)
By: Divyash Chhetri
| Published: Mar 14, 2014
George Wells Beadle studied corn, fruit flies, and funguses in the US during the twentieth century. These studies helped Beadle earn the 1958 Nobel…
Beadle, George Wells, 1903-1989Genetics
Alan Mathison Turing (1912-1954)
By: Julia Damerow
| Published: Jun 22, 2010
Alan Mathison Turing was a British mathematician and computer scientist who lived in the early twentieth century. Among important contributions in…
PeopleMorphogenesisBiographyModels
James Alexander Thomson (1958- )
By: Ke Wu
| Published: Feb 01, 2011
James Alexander Thomson, affectionately known as Jamie Thomson, is an American developmental biologist whose pioneering work in isolating and…
PeopleThomson, James A., Dr.Stem CellsBiography
Sidney Q. Cohlan (1915-1999)
By: Bianca Zietal, Chanapa Tantibanchachai
| Published: Jun 18, 2017
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…
Abnormalities, HumanRetinoidsVitamin AHypervitaminosisTetracycline
Copper Intrauterine Device (IUD)
By: Victoria Higginbotham
| Published: Jul 05, 2018
The copper intrauterine device, or IUD, is a long-term, reversible contraceptive first introduced by Howard Tatum and Jamie Zipper in 1967. Health…
ContraceptivesCopper intrauterine contraceptivesDalkon Shield (Intrauterine contraceptive)Levonorgestrel intrauterine contraceptivesNorgestrel
Benjamin Harrison Willier (1890-1972)
By: Karen Wellner
| Published: Jun 28, 2010
Benjamin Harrison Willier is considered one of the most versatile embryologists to have ever practiced in the US. His research spanned most of the…
TransplantationBiography
Ericsson Method of Sperm Separation
By: Alysse Blight
| Published: Sep 20, 2019
In 1973, Ronald Ericsson developed the Ericsson method, which is a technique used to separate human male sperm cells by their genetic material.…
TechnologySex ChromosomesGonosomesSpermSpermatozoa
George W. Beadle's One Gene-One Enzyme Hypothesis
By: Divyash Chhetri
| Published: May 23, 2014
The one gene-one enzyme hypothesis, proposed by George Wells Beadle in the US in 1941, is the theory that each gene directly produces a single enzyme…
Beadle, George Wells, 1903-1989GeneticsGenetics, ExperimentalDrosophila melanogaster
Stafford Leak Warren (1896–1981)
By: Meilin Zhu
| Published: Aug 30, 2017
Stafford Leak Warren studied nuclear medicine in the United States during the twentieth century. He used radiation to make images of the body for…
Warren, Stafford L. (Stafford Leak), 1896-1981RadiologyMedical radiologyRadiology--ResearchCancer--Interventional radiology