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Spermism
By: Cera R. Lawrence
| Published: Aug 13, 2008
Spermism was one of two models of preformationism, a theory of embryo generation prevalent in the late seventeenth through the end of the eighteenth…
SpermatozoaSpermOva
Preformationism in the Enlightenment
By: Cera R. Lawrence
| Published: Aug 11, 2008
Preformationism was a theory of embryological development used in the late seventeenth through the late eighteenth centuries. This theory held that…
OvaSperm
St. Thomas Aquinas (c. 1225-1274)
By: Katherine Brind'Amour
| Published: Nov 11, 2007
Widely known as a key contributor to the Roman Catholic Church's body of doctrine, St. Thomas Aquinas also published an opinion on the moral status…
religionCatholicismFetusHuman Development
"Declaration on Procured Abortion" (1974), by the Vatican
By: Katherine Brind'Amour
| Published: Nov 11, 2007
As various societies around the world began legalizing abortive procedures or liberalizing government stances on abortion, the Roman Catholic Church'…
LiteraturereligionReproductionCatholicismAbortion
Mary Frances Lyon (1925–2014)
By: Devangana Shah
| Published: Jul 04, 2025
Mary Frances Lyon studied gene expression and developed the theory of X-chromosome inactivation, also called Lyonization, during the twentieth…
Gene ExpressionX Chromosome InactivationLyon HypothesisLyonizationMutation
Menstrual Hygiene Management in Low-Income Countries
By: Emily Santora
| Published: Jul 16, 2021
Menstrual hygiene management, or MHM, is a concept that concerns girls' and women’s access to the appropriate information and resources to manage…
MenstruationMenstruation--Social aspectsFeminine Hygiene ProductsUNICEFUnited Nations and non-member nations
Oliver Allison Ryder III (1946– )
By: Bailey Renee, Karen Love
| Published: Sep 14, 2017
Oliver Allison Ryder studied chromosomal evolution and endangered species in efforts for wildlife conservation and preservation at the San Diego Zoo…
San Diego ZooEscherichia coliPrzewalski's horseQuaggaBenirschke, Kurt
Androgen Insensitivity Syndrome
By: Mary Drago
| Published: Jun 05, 2014
Androgen Insensitivity Syndrome (AIS) is a human disorder in which an individual's genetic sex (genotype) differs from that individual's observable…
AndrogensAndrogens--PathophysiologyIntersexualityIntersex peopleAndrogen-Insensitivity Syndrome
Fetal Alcohol Syndrome (FAS)
By: Erica O'Neil
| Published: Jan 28, 2014
The concept Fetal Alcohol Syndrome (FAS) refers to a set of birth defects that occur in children born to mothers who abused alcohol during pregnancy…
fetal alcohol syndromeAbnormalities, HumanCentral Nervous SystemalcoholPregnancy
Gastrulation in Mus musculus (common house mouse)
By: Justin M. Wolter
| Published: Oct 04, 2012
As mice embryos develop, they undergo a stage of development called gastrulation. The hallmark of vertebrate gastrulation is the reorganization of…
GastrulationMiceGerm CellsSomatic embryogenesisEmbryos