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Endoderm
By: Kate MacCord
| Published: Nov 17, 2013
Endoderm is one of the germ layers-- aggregates of cells that organize early during embryonic life and from which all organs and tissues develop.…
GastrulationEmbryosEmbryologyCellsTissues
Ina May Gaskin (1940– )
By: Megan O’Reilly
| Published: Jun 16, 2020
Ina May Gaskin is a certified professional midwife, or CPM, in the US during the late twentieth and early twenty-first centuries. She worked at the…
PeopleChildbirthChildbirth teachersChildbirth at homeChildbirth in literature
Categorization of Conservative, Semi-Conservative, and Dispersive DNA Replication Theories (1953–1956)
By: Victoria Hernandez
| Published: Oct 31, 2019
In 1956, Gunther Stent, a scientist at the University of California Berkeley in Berkeley, California, coined the terms conservative, semi-…
DNADNA ReplicationDNA HelicasesGenesHeredity
“Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid” (1953), by James Watson and Francis Crick
By: Victoria Hernandez
| Published: Oct 31, 2019
In April 1953, James Watson and Francis Crick published “Molecular Structure of Nucleic Acids: A Structure of Deoxyribose Nucleic Acid” or “A…
LiteratureDNAComplementary DNADNA ReplicationDeoxyribonucleic Acid
Marshall Henry Klaus (1927–2017)
By: Alexis Darby
| Published: Jul 17, 2018
Marshall Henry Klaus was a scientist and pediatrician who studied maternal-infant bonding in the twentieth century in the United States. Maternal-…
Mother and infantMother-Infant InteractionDoulasLaborObstetrics
Chernobyl Heart (2003)
By: Jessica Cartwright
| Published: Jun 01, 2018
In 2003, HBO Original Programming released the documentary Chernobyl Heart. Maryann De Leo directed and produced the film, which is about the…
LiteratureChernobyl Nuclear Accident, Chornobylʹ, Ukraine, 1986CesiumRadiation--Health aspectsIonizing radiation--Health aspects
Ernest John Christopher Polge (1926-2006)
By: Bailey Renee
| Published: Jan 30, 2018
Twentieth-century researcher Ernest John Christopher Polge studied the reproductive processes of livestock and determined a method to successfully…
Smith, Audrey U.Parkes, A. S. (Alan Sterling), 1900-1990National Institute for Medical Research (Great Britain)Medical Research Council (Great Britain)Glycerin
Equilibrium Density Gradient Centrifugation in Cesium Chloride Solutions Developed by Matthew Meselson and Franklin Stahl
By: Victoria Hernandez
| Published: Dec 19, 2017
Matthew Meselson, Franklin Stahl, and Jerome Vinograd, developed cesium chloride, or CsCl, density gradient centrifugation in the 1950s at the…
TechnologyDNA ReplicationDNA replication--RegulationCentrifugation, Density GradientOrganonitrogen compounds
Twice Born–Stories from the Special Delivery Unit (2015), by the Public Broadcasting Service and Trailblazer Studios
By: Jessica Cartwright
| Published: Oct 05, 2017
In 2015, the Public Broadcasting Service, or PBS, released a three-part documentary series, Twice Born–Stories from the Special Delivery Unit,…
LiteratureFetus--SurgerySpina BifidaTeratomaObstetrics--Surgery
Eugen Steinach (1861–1944)
By: Federica Turriziani Colonna, Claudia Nunez-Eddy
| Published: Feb 16, 2017
Eugen Steinach researched sex hormones and their effects on mammals in the late nineteenth and early twentieth centuries in Europe. He experimented…
Hormones, SexGenerative organsGenital OrgansGonadal Steroid HormonesTesticular Hormones