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Otto Mangold (1891-1962)
By: Megan Kearl
| Published: Jun 02, 2010
Otto Mangold was an early twentieth century embryologist who specialized in the development of amphibian embryos. A major emphasis of his research…
PeopleOrganizers, EmbryonicBiographyAmphibians
John Spangler Nicholas (1895-1963)
By: Ellen M. DuPont
| Published: Jul 23, 2008
John Spangler Nicholas, an American biologist, was born on 10 March 1895 in Allegheny, Pennsylvania. He was the only child of Elizabeth Ellen…
PeopleBiographyMammalsAmphibians
Hilde Mangold (1898-1924)
By: Maria Doty
| Published: May 09, 2011
Hilde Mangold, previously Hilde Proescholdt, was a German embryologist and physiologist who became well known for research completed with Hans…
Organizers, EmbryonicBiographydifferentiationAmphibians
Gustav Jacob Born (1851-1900)
By: Karen Wellner
| Published: Jul 22, 2009
Gustav Jacob Born was an experimental embryologist whose original work with amphibians served as the platform for his wax-plate method of embryo…
PeopleTransplantationBiographyAmphibians
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
"Experiments in Transplanting Limbs and Their Bearing Upon the Problems of the Development of Nerves" (1907), by Ross Granville Harrison
By: Adam R. Navis
| Published: Nov 08, 2007
In his 1907 paper, "Experiments in Transplanting Limbs and Their Bearing Upon the Problems of the Development of Nerves," in the Journal of…
TransplantationExperimentsFrogsAmphibians
Gastrulation in Xenopus
By: Inbar Maayan
| Published: Mar 10, 2011
The process of gastrulation allows for the formation of the germ layers in metazoan embryos, and is generally achieved through a series of complex…
Haeckel, Ernst, 1834-1919GastrulationAmphibiansFrogs