Spemann

Spe·mann

(shpā′män′), Hans 1869-1941.
German zoologist and physiologist. He won a 1935 Nobel Prize for his discovery of the organizer effect in embryonic development.
References in periodicals archive ?
From 1900-1950, other prominent developmental biologists including Driesch, Spemann, and Weiss worked from this same perspective.
Expression cloning of noggin, a new dorsalizing factor localized to the Spemann organizer in Xenopus embryos.
111) Walter Sutton hypothesized in 1902 that "chromosomes hold the genetic information in the nucleus," twelve years later Hans Spemann was able to perform the first successful nuclear transfer (112) experiment.
Normally, cortical rotation activates the Nieuwkoop center of the vegetal hemisphere, which will thereafter in the blastula induce the formation of the Spemann organizer region in the marginal zone.
Meyer begins the narrative in chapter 14 by outlining the experiments of Hans Spemann and his PhD student Hilda Mangold in the 1920s on developing newts, plus some important subsequent studies during the middle-twentieth century, which demonstrated the significance of the cellular chemical environment for gene expression during development.
Early in the 20th century, German biologist Hans Spemann separated two cells of a salamander zygote using a strand of his daughter's hair.
The first significant step towards understanding the issue was made nearly a century ago in experiments conducted by the German embryologists Hans Spemann and Hilde Mangold.
It has generally been thought that this transformation is triggered by chemical and physical influences from other tissues, such as lens or cornea, but some, including the father of experimental embryology, Hans Spemann, have suggested that perhaps external induction or force is not necessary.
It has generally been thought that this transformation is triggered by chemical and physical influences from other tissues, such as lens or comea, but some, including the father of experimental embryology, Hans Spemann, have suggested that perhaps external induction or force is not necessary.
If Zapf had designed no other typefaces, Gilgengart-and to a lesser degree Novalis-would have gone down in typographic history as lovely, even excellent, designs that found little use, similar to the Gavotte font by Rudo Spemann or Rhapsodie by Ilse Schiile.
Hans Spemann concentro su atencion en las primeras fases del desarrollo, cuando el embrion empieza a diferenciarse visiblemente.
En 1938 el aleman Hans Spemann propuso la insercion de un nucleo a un ovulo previamente enucleado, lo que, en esencia, es la tecnica que se utilizo en la primera clonacion.