title: Contributions of Theodor Wilhelm Engelmann on phototaxis, chemotaxis, and photosynthesis.
abstract: Theodor Wilhelm Engelmann (1843-1909), who had a creative life in music, muscle physiology, and microbiology, developed a sensitive method for tracing the photosynthetic oxygen production of unicellular plants by means of bacterial aerotaxis (chemotaxis). He discovered the absorption spectrum of bacteriopurpurin (bacteriochlorophyll a) and the scotophobic response, photokinesis, and photosynthesis of purple bacteria.
authors.affiliation: Institut für Biologie 2, Mikrobiologie, Albert-Ludwigs-Universität, Schänzlestr. 1, 79104, Freiburg, Germany. gerhart.drews@biologie.uni-freiburg.de
authors.forename: Gerhart
authors.initials: G
authors.lastname: Drews
mesh_terms: D001419:Bacteria / Q000166:cytology / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D002633:Chemotaxis / Q000187:drug effects / Q000528:radiation effects; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D008829:Microbiology / Q000266:history*; D010100:Oxygen / Q000378:metabolism / Q000494:pharmacology; D010777:Photochemistry / Q000266:history*; D010788:Photosynthesis; D013455:Sulfur / Q000378:metabolism
chemical_list: D013455:Sulfur; D010100:Oxygen