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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 AHypervitaminosisTetracyclineThe 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 contraceptivesNorgestrelBenjamin Harrison Willier is considered one of the most versatile embryologists to have ever practiced in the US. His research spanned most of the…
TransplantationBiographyIn 1973, Ronald Ericsson developed the Ericsson method, which is a technique used to separate human male sperm cells by their genetic material.…
TechnologySex ChromosomesGonosomesSpermSpermatozoaThe 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 melanogasterStafford 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 radiologyErnest Everett Just was an early twentieth century American experimental embryologist involved in research at the Marine Biological Laboratory (MBL)…
FertilizationBiographyInvertebratesIgnacio Vives Ponseti developed a noninvasive method for treating congenital club foot in the US during the late 1940s. Congenital club foot is a…
ClubfootFoot--AbnormalitiesOrthopedicsCongenital Talipes EquinovarusClubfoot, CongenitalJohn Chassar Moir lived in Scotland during the twentieth century and helped develop techniques to improve the health of pregnant women. Moir helped…
ObstetricsPregnancyErgot AlkaloidsHemorrhageVagina"Induction and Patterning of the Primitive Streak, an Organizing Center of Gastrulation in the Amniote," (hereafter referred to as "Induction")…
LiteraturePublicationsGastrulationChicksdifferentiation