Engelmann , Theodor Wilhelm
(1843–1909) German physiologist
Engelmann, the son of a publisher, was educated at Jena, Heidelberg, and Göttingen, before obtaining his PhD from the university in his native city of Leipzig in 1867. He immediately joined the faculty of the University of Utrecht, serving there as professor of physiology from 1888 until 1897 when he returned to Germany to a similar chair at the University of Berlin, where he remained until his retirement in 1908.
Between 1873 and 1895 Engelmann published a number of papers on muscle contraction. By this time, following the work of such physiologists as William Bowman, the main anatomical details of striated muscle had been established. However an explanation was needed as to why the anisotropic or A bands refract polarized light quite differently to the isotropic or I bands. Engelmann had noted that in contraction the A bands increased in volume while the I bands decreased. He consequently proposed his ‘imbibition’ theory in which the contraction of striped muscle is attributed to a flow of fluid from the I to the A bands.
Engelmann also worked on the nature and mechanism of the heartbeat and in 1875 devised an experiment that proved the heartbeat is myogenic; that is, the contraction originates in the heart muscle and not from an external nerve stimulus. In 1881 he discovered the chemotactic response of certain bacteria to oxygen, and he also demonstrated that red and blue light is far more effective in stimulating plant chloroplasts during photosynthesis than other parts of the spectrum.

Scientists. . 2011.

Look at other dictionaries:

  • Theodor Wilhelm Engelmann — Nacimiento 1843 Leipzig, Alemania Fallecimiento 1909 Residencia Alemania Campo Fisiología …   Wikipedia Español

  • Theodor Wilhelm Engelmann — (* 14. November 1843 in Leipzig; † 20. Mai 1909 in Berlin) war ein deutscher Physiologe. Inhaltsverzeichnis …   Deutsch Wikipedia

  • Theodor Wilhelm Engelmann — Le professeur Engelmann. Theodor Wilhelm Engelmann (né le 14 novembre 1843 à Leipzig; † 20 mai 1909 à Berlin) est un physiologiste allemand qui a joué un rôle décisif dans l’analyse des mécanismes de la contraction musculaire et de la… …   Wikipédia en Français

  • Theodor Wilhelm Engelmann — Infobox Scientist name = Theodor Wilhelm Engelmann image width = caption = birth date = 1843 birth place = Leipzig, Germany death date = 1909 death place = residence = Germany citizenship = German nationality = field = Physiology work institution …   Wikipedia

  • Engelmann — may refer to: * Engelmann Oak, also called Pasadena Oak * Engelmann Spruce, a medium sized evergreen tree * Engelmann syndrome, a rare autosomal dominant genetic disorderEngelmann is the surname of: * Eduard Engelmann Jr. * Franklin Engelmann *… …   Wikipedia

  • Engelmann-Krankheit — Klassifikation nach ICD 10 Q78.3 Progrediente diaphysäre Dysplasie …   Deutsch Wikipedia

  • Engelmann'scher Bakterienversuch — Das Ziel dieses Experiments bestand darin, die Fähigkeit des Chlorophylls, aus Lichtenergie Sauerstoff zu produzieren, in verschiedenen Bereichen des Lichtspektrums zu testen. Zu diesem Zwecke ließ Theodor Wilhelm Engelmann einen Lichtstrahl… …   Deutsch Wikipedia

  • Engelmann — ist der Familienname folgender Personen: Andreas Engelmann (* 1954), deutscher Schauspieler Andrews Engelmann (1901–1992), deutschbaltischer Schauspieler Bernt Engelmann (1921–1994), deutscher Schriftsteller und Journalist Dieter Engelmann (*… …   Deutsch Wikipedia

  • Engelmann — Engelmann, 1) Wilhelm, Buchhändler und Bibliograph, geb. 1. Aug. 1808 in Lemgo, gest. 23. Dez. 1878 in Leipzig, kam 1847 in den Alleinbesitz des väterlichen Geschäfts in Leipzig, dem er seit 1. Sept. 1839 bereits als Teilhaber angehört hatte. E.… …   Meyers Großes Konversations-Lexikon

  • Engelmann-Syndrom — Klassifikation nach ICD 10 Q78.3 Progrediente diaphysäre Dysplasie …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”