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Hans Adolf Eduard Driesch
Hans Adolf Eduard Driesch (28 October 1867 – 17 April 1941) was a German biologist and philosopher from Bad Kreuznach. He is most noted for his early experimental work in embryology and for his neo-vitalist philosophy of entelechy. He has also been credited with performing the first artificial 'cloning' of an animal in the 1880s, although this claim is dependent on how one defines cloning. Early years Driesch was educated at the Gelehrtenschule des Johanneums. He began to study medicine in 1886 under August Weismann at the University of Freiburg. In 1887 he attended the University of Jena under Ernst Haeckel, Oscar Hertwig and Christian Ernst Stahl. In 1888 he studied physics and chemistry at the University of Munich. He received his doctorate in 1889. He travelled widely on field and study trips and lecture-tours, visiting Plymouth, India, Zurich and Leipzig where, in 1894, he published his ''Analytische Theorie der organischen Entwicklung'' or ''Analytic Theory of Organic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bad Kreuznach
Bad Kreuznach () is a town in the Bad Kreuznach district in Rhineland-Palatinate, Germany. It is a spa town, most well known for its medieval bridge dating from around 1300, the Alte Nahebrücke, which is one of the few remaining bridges in the world with buildings on it.Brückenhäuser, Alte Nahebrücke, Neustadt , Bad Kreuznach o www.romantic-germany.info (in English). Retrieved 14 June 2018 The town is located in the Nahe River wine region, renowned both nationally and internation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oscar Hertwig
Oscar Hertwig (21 April 1849 in Friedberg – 25 October 1922 in Berlin) was a German embryologist and zoologist known for his research in developmental biology and evolution. Hertwig is credited as the first man to observe sexual reproduction by looking at the cells of sea urchins under the microscope. Biography Hertwig was the elder brother of zoologist-professor Richard Hertwig (1850–1937). The Hertwig brothers were the most eminent scholars of Ernst Haeckel (and Carl Gegenbaur) from the University of Jena. They were independent of Haeckel's philosophical speculations but took his ideas in a positive way to widen their concepts in zoology. Initially, between 1879 and 1883, they performed embryological studies, especially on the theory of the coelom (1881), the fluid-filled body cavity. These problems were based on the phylogenetic theorems of Haeckel, i.e. the biogenic theory (German = biogenetisches Grundgesetz), and the " gastraea theory". Within 10 years, the two bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Aberdeen
The University of Aberdeen ( sco, University o' 'Aiberdeen; abbreviated as ''Aberd.'' in List of post-nominal letters (United Kingdom), post-nominals; gd, Oilthigh Obar Dheathain) is a public university, public research university in Aberdeen, Scotland. It is an Ancient universities of Scotland, ancient university founded in 1495 when William Elphinstone, Bishop of Aberdeen and Lord Chancellor of Scotland, Chancellor of Scotland, petitioned Pope Alexander VI on behalf of James IV of Scotland, James IV, King of Scots to establish King's College, Aberdeen, King's College, making it Scotland's 3rd oldest university and the 5th oldest in the English-speaking world and the United Kingdom. Aberdeen is consistently ranked among the top 160 universities in the world and is ranked within the top 20 universities in the United Kingdom according to ''The Times'' and ''The Sunday Times'', and 13th in the UK according to ''The Guardian''. The university comprises three colleges—King's College ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ontogeny
Ontogeny (also ontogenesis) is the origination and development of an organism (both physical and psychological, e.g., moral development), usually from the time of fertilization of the egg to adult. The term can also be used to refer to the study of the entirety of an organism's lifespan. Ontogeny is the developmental history of an organism within its own lifetime, as distinct from phylogeny, which refers to the evolutionary history of a species. Another way to think of ontogeny is that it is the process of an organism going through all of the developmental stages over its lifetime. The developmental history includes all the developmental events that occur during the existence of an organism, beginning with the changes in the egg at the time of fertilization and events from the time of birth or hatching and afterward (i.e., growth, remolding of body shape, development of secondary sexual characteristics, etc.). While developmental (i.e., ontogenetic) processes can influence sub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sven Hörstadius
Sven Hörstadius (1898–1996) was a Swedish embryologist known for his work on sea urchin embryos. He was responsible for an increased understanding of the neural crest. Hörstadius studied under John Runnström at Stockholm University College and was awarded his Ph.D. in 1930. He was appointed professor of zoology at Uppsala University 1942, where he remained until his retirement in 1964, but continued to lecture as an emeritus. He was elected a member of the Royal Swedish Academy of Sciences in 1946 and of the Royal Society The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, re ... in 1952. References 1898 births 1996 deaths 20th-century Swedish zoologists Uppsala University faculty Members of the Royal Swedish Academy of Sciences Foreign Members of the Royal Society Burials ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Preformation
In the history of biology, preformationism (or preformism) is a formerly popular theory that organisms develop from miniature versions of themselves. Instead of assembly from parts, preformationists believed that the form of living things exist, in real terms, prior to their development.Maienschein, Jane,Epigenesis and Preformationism, The Stanford Encyclopedia of Philosophy (Fall 2008 Edition), Edward N. Zalta (ed.). It suggests that all organisms were created at the same time, and that succeeding generations grow from homunculi, or animalcules, that have existed since the beginning of creation, which is typically defined by religious beliefs. EpigenesisAccording to the Oxford English Dictionary: It is also worth quoting this adumbration of the definition given there (viz., "The formation of an organic germ as a new product"): (or neoformism), then, in this context, is the denial of preformationism: the idea that, in some sense, the form of living things comes into existence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cell (biology)
The cell is the basic structural and functional unit of life forms. Every cell consists of a cytoplasm enclosed within a membrane, and contains many biomolecules such as proteins, DNA and RNA, as well as many small molecules of nutrients and metabolites.Cell Movements and the Shaping of the Vertebrate Body in Chapter 21 of Molecular Biology of the Cell '' fourth edition, edited by Bruce Alberts (2002) published by Garland Science. The Alberts text discusses how the "cellular building blocks" move to shape developing embryos. It is also common to describe small molecules such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blastomere
In biology, a blastomere is a type of cell produced by cell division (cleavage) of the zygote after fertilization; blastomeres are an essential part of blastula formation, and blastocyst formation in mammals. Human blastomere characteristics In humans, blastomere formation begins immediately following fertilization and continues through the first week of embryonic development. About 90 minutes after fertilization, the zygote divides into two cells. The two-cell blastomere state, present after the zygote first divides, is considered the earliest mitotic product of the fertilized oocyte. These mitotic divisions continue and result in a grouping of cells called blastomeres. During this process, the total size of the embryo does not increase, so each division results in smaller and smaller cells. When the zygote contains 16 to 32 blastomeres it is referred to as a morula. These are the preliminary stages in the embryo beginning to form. Once this begins, microtubules within the mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Urchin
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Roux
Wilhelm Roux (9 June 1850 – 15 September 1924) was a German zoologist and pioneer of experimental embryology. Early life Roux was born and educated in Jena, Germany where he attended university and studied under Ernst Haeckel. He also attended university in Berlin and Strasbourg and studied under Gustav Schwalbe, Friedrich Daniel von Recklinghausen, and Rudolf Virchow. Although he was trained as a clinical doctor, he spent his career in experimental biology. His doctoral thesis on the embryological development of blood vessels was a seminal early study in biophysical modelling, a milestone in the study of the cardiovascular system. Career and research For ten years Roux worked in Breslau (now Wroclaw), becoming director of his own Institute of Embryology in 1879. He was professor at Innsbruck, Austria from 1889–95, then accepted a professorial chair at the Anatomical Institute of the University of Halle, a post he retained until 1921. Roux's research was based upon the notio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haeckel
Ernst Heinrich Philipp August Haeckel (; 16 February 1834 – 9 August 1919) was a German zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist and artist. He discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms and coined many terms in biology, including ''ecology'', '' phylum'', ''phylogeny'', and ''Protista.'' Haeckel promoted and popularised Charles Darwin's work in Germany and developed the influential but no longer widely held recapitulation theory ("ontogeny recapitulates phylogeny") claiming that an individual organism's biological development, or ontogeny, parallels and summarises its species' evolutionary development, or phylogeny. The published artwork of Haeckel includes over 100 detailed, multi-colour illustrations of animals and sea creatures, collected in his ''Kunstformen der Natur'' ("Art Forms of Nature"), a book which would go on to influence the Art Nouveau artistic mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleology
Teleology (from and )Partridge, Eric. 1977''Origins: A Short Etymological Dictionary of Modern English'' London: Routledge, p. 4187. or finalityDubray, Charles. 2020 912Teleology" In ''The Catholic Encyclopedia'' 14. New York: Robert Appleton Company. Retrieved 3 May 2020. – via ''New Advent'', transcribed by D. J. Potter is a reason or an explanation for something which serves as a function of its end, its purpose, or its goal, as opposed to something which serves as a function of its cause. A purpose that is imposed by human use, such as the purpose of a fork to hold food, is called ''extrinsic''. ''Natural teleology,'' common in classical philosophy, though controversial today, contends that natural entities also have ''intrinsic'' purposes, regardless of human use or opinion. For instance, Aristotle claimed that an acorn's intrinsic ''telos'' is to become a fully grown oak tree. Though ancient atomists rejected the notion of natural teleology, teleological accounts of non ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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