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Topic: Spemann, Hans

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	Spemann's induction experiments
		Spemann claimed that contact of the optic vesicle with the overlying ectoderm was needed to turn that ectoerm into a lens, but he did not know whether or not it was a sufficient cause.
		After all, in 1903, Spemann (10) had shown that in constricted eggs, two neural axes form and that the extent of the neural tube appeared to be correlated with the extent to which the underlying archenteron roof mesoderm had progressed.
		Spemann (10; quoted in 6) had even written that "It is conceivable that the neural plate is induced by the archenteron." However, Spemann was not thinking in those terms in 1918.
	zygote.swarthmore.edu /regul2.html (1482 words)

	Scientific Anti-Vivisectionism ->
		Two years after this, Spemann showed, in constricted eggs, two neural axes form and the extent of the neural tube appeared to correlate with the extent to which the underlying cavity roof of the middle layer of the early embryo had progressed(2).
		Spemann proposed a "model" concerning the operculum (in humans, a plug of fibrin and blood cells developing over the site where a developing fertilized foetus has become embedded in the wall of the uterus) of tadpoles(4).
		In 1914, Spemann decided to test the state of determination of early salamander gastrula, and transplanted small regions of embryos from one region on one salamander gastrula to a new region on another gastrula.
	www.freewebs.com /scientific_anti_vivisectionism8/understandingof.htm (2718 words)

	A Baby's Hair
		Hans Spemann was in a foul mood as he rearranged his blankets.
		Spemann knew that Weismann’s theory was similar to that of Wilhelm Roux, who called it “qualitative division,” since cells change their genes every time they divide.
		Spemann called it twinning, but we know it today by a different, more loaded, name: Spemann had documented the first in-vitro animal clone, and it was more than a little perplexing.
	www.scienceforpeople.com /Essays/baby_hair.htm (3742 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		Spemann's name will always be associated with the work he did on experimental embryology.
		Earlier Spemann had transplanted the optic cups of new embryos into the outermost layer of the region of the abdomen and had found that they induced the production, in this new situation, of a lens of the eye.
		By these and other experiments of a similar kind Spemann laid the foundations of the theory of embryonic induction by organizers, which led later to biochemical studies of this process and the ultimate development of the modern science of experimental morphogenesis.
	www.angelfire.com /on/HansSpemann1869 (323 words)

	Developmental Biology, Historical Roots of (Site not responding. Last check: 2007-10-19)
		A remarkable series of experiments conducted by the German embryologist Hans Spemann and his student Hilde Mangold in 1924 fired the imagination of embryologists and spawned a new era of embryological investigation that was truly the heyday of embryology.
		Spemann and Mangold demonstrated that the transplantation of a small amount of tissue from the dorsal side of an early embryo of Triturus (tailed amphibian) could induce host tissue to form a secondary embryonic axis, including neural tissue.
		Spemann concluded that the behavior of an implanted region (the dorsal lip of the blastopore) reflects its normal function in inducing the primary axis and designated it as the embryonic organizer.
	www.acs.ucalgary.ca /~browder/roots.html (1246 words)

	Spemann, Hans (Site not responding. Last check: 2007-10-19)
		Spemann was born in Stuttgart and studied at Heidelberg and Würtzburg.
		Next he transplanted various embryonic parts to other areas of the embryo and to different embryos, and demonstrated that one area of embryonic tissue influences the development of neighbouring tissues.
		In another series of experiments, Spemann found that embryonic tissue from newts always gives rise to newt organs, even when transplanted into a frog embryo, and that frog tissue always develops into frog organs in a newt embryo.
	cartage.org.lb /en/themes/Biographies/MainBiographies/S/Spemann/1.html (186 words)

	About Hans Spemann (Site not responding. Last check: 2007-10-19)
		German embryologist who was awarded the Nobel Prize for Physiology or Medicine in 1935 for his discovery of the effect now known as embryonic induction, the influence exercised by various parts of the embryo that directs the development of groups of cells into particular tissues and organs.
		Spemann, initially a medical student, attended the universities of Heidelberg, Munich, and Wurzburg and graduated in zoology, botany, and physics.
		Spemann's concept of induction was based upon a lifetime of research into the early development of the newt.
	bio.p9.org.uk (224 words)

	Hans Spemann - Biography
		Hans Spemann was born on June 27, 1869, at Stuttgart.
		In 1898 he qualified as a lecturer in zoology at the University of Würzburg, and in 1908 he was asked to become Professor of Zoology and Comparative Anatomy at Rostock, and in 1914 he became Associate Director of the Kaiser Wilhelm Institute of Biology at Berlin-Dahlem.
		Spemann's name will always be associated with his work on experimental embryology.
	nobelprize.org /medicine/laureates/1935/spemann-bio.html (632 words)

	Cloning (Site not responding. Last check: 2007-10-19)
		Using a strand of hair as a noose, Hans Spemann tightened it around a newly fertilized egg cell of a salamander.
		Spemann proposed the "fantastical experiment" of cloning an organism from differentiated or even adult cells using the method of nuclear transfer in his 1938 publication
		Hans Spemann received the Nobel Prize in medicine in 1935 for his experiments on the organizer effect: one part of an embryo when transplanted to other regions of the embryo will cause changes in the surrounding tissue
	members.aol.com /SteffisLab/cloning2.htm (314 words)

	Neuroscience Newsletter
		It was in this context that the courage and independence of thought of the founders of experimental embryology, Wilhelm Roux, Hans Driesch, Ross Harrison and Hans Spemann, served as an inspiration to an entire generation of emerging biologists and embryologists.
		Spemann's department was dominated by experimental embryology and a fellow student Hilde Mangold (nee Proescholdt) was just beginning her Ph.D. project involving research that later became famous as the organizer experiment, which won Spemann the Nobel Prize in 1935.
		Many of the discoveries of the Spemann school, and later those of Hamburger, came not from doing what was fashionable, but from a deep understanding of developmental events based on detailed observations of experimental material.
	www.sfn.org /NL/2000/May-June/articles/pioneer.html (1545 words)

	Memories of Professor Hans Spemann's Department of Zoology at the University of Freiburg, 1920-1932 (Site not responding. Last check: 2007-10-19)
		Professor Spemann came to Freilburg in the spring of 1919, as the Chairman of the Zoological Institute of the University.
		Under Spemann's leadership it became the carter of experimental embryology in Germany.
		Spemann had established his reputation as the chairman of the Department of experimental embryology at the Kaiser Wilhelm (now Max Planck) Institute for Biology in Berlin-Dahlem, and its co-director, with the botanist C. Correns, 1915-1918.
	www.ijdb.ehu.es /9601/a59.htm (191 words)

	Hans Spemann -- Encyclopædia Britannica
		In 1828 the Russian zoologist Karl Ernst von Baer observed that in their earlier phases the embryos of higher species resemble those of lower species but that the embryos of the higher species are never...
		The German-born painter Hans Hofmann was one of the principal inspirations for the style called abstract expressionism.
		U.S. physicist Hans Albrecht Bethe was born in Strasbourg, Alsace-Lorraine.
	www.britannica.com /eb/article-9069062 (708 words)

	FML - Biography of Hans Spemann (1869-1941) (Site not responding. Last check: 2007-10-19)
		Hans Spemann was born in Stuttgart on June 27th, 1869.
		Hans Spemann studied embyogenesis on the newt embryo by transplantation and by cutting off the circulation to certain tissues.
		One of his most famous experiments together with H. Mangold was the transplantation of the blastopol lip in a Triturus embryo, wich led to the formation of a second body axsis, like in siamese twins.
	www2.fml.tuebingen.mpg.de /Spemann (181 words)

	Ethel Browne, Hans Spemann, and the Discovery of the Organizer Phenomenon -- Lenhoff 181 (1): 72 -- The Biological ...
		Ethel Browne, Hans Spemann, and the Discovery of the Organizer Phenomenon -- Lenhoff 181 (1): 72 -- The Biological Bulletin
		Ethel Browne, Hans Spemann, and the Discovery of the Organizer Phenomenon
		Spemann and Mangold (1924) in a paper that led to Spemann's being awarded
	www.biolbull.org /cgi/content/abstract/181/1/72 (221 words)

	372-S01-Handout#15 (Site not responding. Last check: 2007-10-19)
		When the dorsal lip of the blastopore (DLB) was transplanted from an early gastrula into the ventral ectoderm of another gastrula (using two strains of differently pigmented newts), transplanted DLB not only continued to be the blastopore, but it also initiated gastrulation and embryogenesis of a second embryo in the surrounding tissue....>secondary embryo!
		Spemann proposed that the dorsal lip material induces the overlying ectoderm to become neural tissue.
		1) dorsal lip cells induced the host's ventral tissue (in Spemann's graft experiment) to change their fates to form a neural tube and dorsal mesoderm tissue.
	www.sonoma.edu /Biology/Pillai/Biology372/372-s01-handout_14.html (343 words)

	AllRefer.com - Hans Spemann (Cell Biology, Biography) - Encyclopedia
		AllRefer.com - Hans Spemann (Cell Biology, Biography) - Encyclopedia
		Hans Spemann[hAns shpA´mAn] Pronunciation Key, 1869–1941, German embryologist.
		More articles from AllRefer Reference on Hans Spemann
	reference.allrefer.com /encyclopedia/S/Spemann.html (183 words)

	Hans Spemann Biography / Biography of Hans Spemann Biographies
		university · medicine · science · nobel laureates · egg · embryo · comparative anatomy · zoology · embryologists · kaiser wilhelm · epidermis · sea urchins · hans spemann · roux · berlin dahlem · hans driesch · experimental embryology
		All biographies listed are included in the Hans Spemann Biography Pass.
		Each Biography is written by a biographical expert or professional educator and is a complete resource on the individual.
	www.bookrags.com /biography-hans-spemann/index.html (110 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		1902- Hans Spemann separated salamander embryo cells by tying a strand of baby hair in-between two cells to separate them.
		1928- Hans Spemann first case of nuclear transfer using the strand of baby hair and salamander cells.
		1938- German scientist Hans Spemann theorizes that fusing an embryo with an egg cell could clone animals.
	www.ops.org /nwest/genclone/clone/clonetm.htm (616 words)

	Hans Spemann Winner of the 1935 Nobel Prize in Medicine
		Hans Spemann Winner of the 1935 Nobel Prize in Medicine
		Hans Spemann Bio And Photo (submitted by Kirk)
		Hans Spemann - Biography (submitted by Davis Brown)
	almaz.com /nobel/medicine/1935a.html (66 words)

	Infoplease Search: kinck hans e.
		(Almanac - People) Hans Blix, Swedish diplomat, headed the United Nations weapons inspection team that was preparing...
		(Almanac - People) Hans Bethe Age: 98 physicist who was a leader in the development of the atom bomb for the U.S. Hans Blix,
		(Almanac - People) Hans Blix, chief UN weapons inspector, delivered several reports to the UN Security Council on his...
	www.infoplease.com /search.php3?query=Kinck+Hans+E. (199 words)

	Cloning Timeline
		~Hans Spemann divides a Salamander embryo in two and shows early cells retain all the generic information necessary to create a new organism.
		1928~ Hans Spemann performs first nuclear transfer experiment.
		1938~ Hans Spemann proposes “fantastical experiment” of cloning higher organisms.
	www.iss.k12.nc.us /schools/nms/sandraellis/CLoningTimeline.htm (311 words)

	Find in a Library: The heritage of experimental embryology : Hans Spemann and the organizer (Site not responding. Last check: 2007-10-19)
		Find in a Library: The heritage of experimental embryology : Hans Spemann and the organizer
		The heritage of experimental embryology : Hans Spemann and the organizer
		WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.
	worldcatlibraries.org /wcpa/ow/a2eebb72f90d5184a19afeb4da09e526.html (63 words)

	Spemann, Hans - ENCYCLOPEDIA - The History Channel UK
		Spemann, Hans - ENCYCLOPEDIA - The History Channel UK or LOGIN
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	www.thehistorychannel.co.uk /site/search/search.php?word=Spemann (201 words)

	Hans Spemann
		He received the 1935 Nobel Prize in Physiology or Medicine and described his research in
		Related content from HighBeam Research on: Hans Spemann
		A fantastical experiment: the science behind the controversial cloning of Dolly.
	www.infoplease.com /ce6/people/A0846235.html (115 words)

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