Hans Spemann (* 27. June 1869 in Stuttgart; "† 9 September 1941 in Freiburg in mash gau) was a German biologist.

Spemann accomplished already 1902 first important attempts for cell division. It succeeded to it for example to separate the two cells of the two-cell stage of a Salamanders whereby it produced artificially twins. It was proven by this experiment and further attempts at more-cellular Embryonalstadien that the Furchungszellen of an embryo on early development stages contains still all heiress formations necessary for the further development.

Since 1919 Spemann professor was in Freiburg in mash gau. it kept 1935 common for with Hilde Mangold the discovered supervisor effect during the Embryonalentwicklung the Nobelpreis for medicine. It had developed by transplant ion experiments to the early Gastrula proven that a fabric localspecifically behaves, thus in accordance with the place, to which the fabric was transplanted into the receiver Gastrula, and not in accordance with the origin place in the donor organism. The cells were not yet determined in this early development stage. In the case of transplant ion experiments to the late Gastrula resulted against it another effect: Here developed origin in accordance with transplant. That is, the fabric was now determined.

Already 1938 suggested the procedure of the core transfer to Spemann as a possibility for the investigation of the development potential of cores in differentiated cells. But this procedure in the research was used only later.

Self certification

"First Boveri had suggested to me working on the development of the sex organs of the tapeworm and only as I shyly objected that in the purely legal family of my bride completely it would compromise me turned into he laughing on another worm, whose soundful name Strongylus could paradoxus to some extent with the fact out sons that it is in the lung of the pig at home." (Research and life 1943).

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See also: Hans Driesch

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