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- Richard Hertwig


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Richard Wilhelm Karl Theodor Ritter von Hertwig (* 23. September 1850 in Friedberg; † 3. Oktober 1937 in Schlederlohe) war ein deutscher Zoologe.


Leben 

Richard von Hertwig studierte zunächst Medizin an der Universität Jena. Unter Einflussnahme Ernst Haeckels verlagerte er sein Interesse mehr zur Zoologie und Biologie. 1872 machte er an der Universität Bonn seinen Doktor und arbeitete dort als Assistent beim Anatomen Max Schultze.

1875 habilitierte er in Jena im Bereich der Zoologie und wurde dort 1878 außerordentlicher Professor. Als Nachfolger von Franz Troschel wurde er 1881 an die Universität Königsberg als Professor für Zoologie berufen. 1883 wechselte er auf dieselbe Professur an die Universität Bonn, wo er jedoch nur kurz blieb, da 1885 ein Ruf der Ludwig-Maximilians-Universität München erfolgte, wo er bis 1925 blieb und auch als Direktor des Zoologischen Instituts und Leiter der Zoologischen Staatssammlung wirkte. Ab 1885 als außerordentliches Mitglied und dann ab 1889 als ordentliches Mitglied gehörte Hertwig der Bayerischen Akademie der Wissenschaften an.

Sein Schüler Otto Koehler wurde zu einem der Begründer der Ethologie in Deutschland.


Forschungstätigkeit 

Zu Beginn seiner Laufbahn machte er viele Arbeiten zusammen mit seinem Bruder Oscar Hertwig. Zusammen entwickelten sie 1881 die so genannte Coelomtheorie, ein Versuch der Erklärung des mittleren Keimblatts, die wichtige Erkenntnisse in der Embryologie brachte. Sie vermutet, dass sich alle Organe und Gewebe verschiedenartig aus drei grundlegenden Gewebeschichten entwickeln.

Hertwig arbeitete systematisch an mehreren Gruppen von Wirbellosen und erstellte grundlegende Arbeiten zum Bau von Tieren. Am bekanntesten sind seine Beiträge zur Protozoenforschung. Er war auch der erste, der anhand des Seeigeleis den Befruchtungsprozeß erstmals richtig als Verschmelzung von Ei- und Spermakern erklärte.

Später untersuchte er mit seinen Kindern Günther und Paula noch die Einwirkung von Radiumstrahlen auf tierische Keimzellen.


Veröffentlichungen 



Quelle (05.2008): http://de.wikipedia.org/wiki/Richard_Hertwig





Richard Wilhelm Karl Theodor Ritter von Hertwig (September 23, 1850 - October 3, 1937), also Richard Hertwig or Richard von Hertwig, was a German zoologist and professor of 50 years, notable as the first to describe zygote formation as the fusing of spermatozoa inside the membrane of an egg cell during fertilization.[1] Richard Hertwig was the younger brother of Oskar Hertwig, who also analyzed zygote formation.[2]

The Hertwig brothers were the most eminent scholars of Ernst Haeckel (and Carl Gegenbaur), each brother becoming a long-term professor in Germany. They were independent of Haeckel's philosophical speculations but took his ideas in a positive way to widen their concepts in zoology. Initially, between 1879-1883, they worked together and performed embryological studies, especially on the theory of the coelom (1881). These problems were based on the phylogenetic theorems of Haeckel, specifically, the biogenic theory (German: biogenetisches Grundgesetz) and the "gastraea theory" of Haeckel.

Within 10 years, the two brothers moved apart to the north and south of Germany. Richard's brother Oskar later became a professor of anatomy in 1888 in Berlin; however, Richard Hertwig had moved 3 years prior, becoming a professor of zoology in Munich from 1885-1925, at Ludwig Maximilians University, where he served the last 40 years of his 50-year career as a professor at 4 universities.

The later research of Richard Hertwig focused on protists (with the relationship between the nucleus and the plasma = "Kern-Plasma-Relation"), as well as on developmental physiological studies on sea urchins and frogs. Richard Hertwig also wrote a leading textbook of zoology, published in 1891.

Life

Hertwig was born in Friedberg in the Grand Duchy of Hesse. He began studying medicine at the University of Jena, and under the influence of professor Ernst Haeckel (16 years older), he shifted his interest more to zoology and biology.[1] In 1872, he received a doctorate at the University of Bonn and worked there as an assistant to anatomist Max Schultze. In 1875, he moved to the University of Jena in the Department of Zoology, and in 1878, Hertwig became extraordinary professor there.[1]

As a successor of Franz Hermann Troschel, Richard Hertwig was appointed in 1881 to the University of Königsberg as a professor of zoology.[1] In 1883, he moved to the same role as professor at the University of Bonn, where he remained only a short while, however, since in 1885, he was called to the Ludwig Maximilians University in Munich, where Hertwig remained until 1925, also working as a director of the zoological institute and director/conductor of the zoological national collection.[1]

Hertwig belonged to the Bavarian Academy of Sciences, beginning in 1885, as an extraordinary member, and then starting in 1889 as a full member.[1]

Hertwig died on October 3, 1937 in Schlederlohe, Germany.

His pupil Otto Koehler became one of the founders of Ethology in Germany.


Research

At the beginning of his career, Richard Hertwig worked along with his brother, Oskar Hertwig. Together they developed, in 1881, the Coelom Theory (German: "Coelomtheorie"), of the fluid-filled body cavity (the "coelom"), as an explanation of the middle Keimblatts, which brought important realizations in the field of embryology.[1] The theory assumes that all organs and tissues develop differently from three primary tissue layers, during animal embryogenesis.

Hertwig worked systematically on several groups of protozoa and metazoa (German: Wirbellosen) and provided fundamental work on the development of animals.[1] His contributions are most well-known to protozoa research.

Hertwig was also first, on the basis of examining sea urchins, to have discovered and explained the zygote fertilization process for the first time correctly as a fusion of egg and spermatozoon (sperm cell) penetrating the egg membrane. Later, Hertwig examined the effect of radium jets, along with his children Günther and Paula, for animal germ cells.


Publications


Notes

  1. ^ a b c d e f g h "Richard von Hertwig - Wikipedia" (German), German Wikipedia, 2006-10-29, de.wikipedia.org webpage: GermanWP-Richard_von_Hertwig.
  2. ^ The two Hertwig brothers worked together until 1883 (more at: Oskar Hertwig).


References


External links






Quelle (05.2008): http://en.wikipedia.org/wiki/Richard_Hertwig


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