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The Source-Sink Model
By: Jack Resnik
| Published: May 07, 2012
The source-sink model, first proposed by biologist Francis Crick in 1970, is a theoretical system for how morphogens distribute themselves across…
Crick, Francis, 1916-2004Nobel Prize winnersEmbryosMorphogenesisGenes
"On the Permanent Life of Tissues outside of the Organism" (1912), by Alexis Carrel
By: Lijing Jiang
| Published: May 06, 2012
'On the Permanent Life of Tissues outside of the Organism' reports Alexis Carrel's 1912 experiments on the maintenance of tissue in culture media. At…
Tissue cultureStem CellsStem cells--ResearchEmbryologyGerm Cells
"How do Embryos Assess Risk? Vibrational Cues in Predator-Induced Hatching of Red-Eyed Treefrogs" (2005), by Karen Warkentin
By: Karla T. Moeller
| Published: Apr 07, 2012
In 'How do Embryos Assess Risk? Vibrational Cues in Predator-Induced Hatching of Red-Eyed Treefrogs' (2005), Karen Warkentin reported on experiments…
EmbryosRed-eyed treefrogPredation (Biology)Science experimentsAmphibians--Eggs
Leo Loeb (1869-1959)
By: Megan Kearl
| Published: Apr 06, 2012
Leo Loeb developed an experimental approach to studying cancer and pioneered techniques for tissue culture and in vitro tissue transplantation which…
PeopleMarine Biological Laboratory (Woods Hole, Mass.)Embryology, ExperimentalTissue cultureEmbryos
Rudolf Carl Virchow (1821-1902)
By: Megan Kearl
| Published: Mar 17, 2012
Rudolf Carl Virchow lived in nineteenth century Prussia, now Germany, and proposed that omnis cellula e cellula, which translates to each cell comes…
PeopleCellsPathology, CellularPathology, Comparativepublic health
In the Womb: Identical Twins (2009), by National Geographic
By: Maggie Pingolt
| Published: Mar 08, 2012
National Geographic's documentary In the Womb: Identical Twins focuses on the prenatal development of human identical twins. Director Lorne Townend…
LiteratureTwinsDocumentary filmsTestosteroneMethylation
Gonzales v. Carhart (2007)
By: Mark Zhang
| Published: Feb 28, 2012
In Gonzales v. Carhart (2007), the US Supreme Court held in a five-to-four decision that the 2003 Partial-Birth Abortion Ban Act passed by the US…
LawAbortionDilatation and extraction abortionFetusPregnancy
Christiane Nusslein-Volhard (1942- )
By: May Catherine, Jack Resnik
| Published: Feb 16, 2012
Christiane Nusslein-Volhard studied how genes control embryonic development in flies and in fish in Europe during the twentieth and twenty-first…
DrosophilaEmbryologyGenesMorphogenesisRNA polymerases
Sir Graham Collingwood Liggins (1926-2010)
By: Kathleen O'Connor
| Published: Feb 16, 2012
Sir Graham Collingwood Liggins devoted much of his professional life to obstetric research. Liggins demonstrated that hormones created by the fetus…
PeopleObstetriciansFetusEmbryosPregnancy
Spemann-Mangold Organizer
By: Samuel Philbrick, Erica O'Neil
| Published: Jan 12, 2012
The Spemann-Mangold organizer, also known as the Spemann organizer, is a cluster of cells in the developing embryo of an amphibian that induces…
EmbryosAmphibiansSpemann, Hans, 1869-1941EmbryologyGastrulation