Ismar Isidor Boas

Ismar Isidor Boas (28 March 1858 – 15 March 1938) was a German gastroenterologist born in the town of Exin.

He studied medicine in Berlin, Halle and Leipzig, and subsequently became an assistant to Carl Anton Ewald (1845-1915) at the Augusta Hospital in Berlin. In 1886, he became a licensed specialist of gastro-intestinal diseases in Berlin.

Boas was one of the leading authorities on gastroenterology in Europe. Alone, and with Professor Ewald, he made several contributions regarding the pathology and physiology of digestion. He described Lactobacillus acidophilus, a bacillus found in the gastric juice of individuals with stomach carcinoma. This bacterium is sometimes referred to as the "Boas-Oppler bacillus".

In 1895 he founded the Archiv für Verdauungs-Krankheiten, the first medical journal dedicated to gastroenterological topics, and in 1913 established the German gastroenterological society (Deutsche Gesellschaft für Verdauungs- und Stoffwechselkrankheiten). He also has a handful of eponyms named in his honor, including:


  • Harro Jenss, Guido Gerken, Markus M. Lerch (2013). 100 Jahre Deutsche Gesellschaft für Verdauungs- und Stoffwechselkrankheiten DGVS. August Dreesbach Verlag Munich. ISBN 978-3-944334-17-2 (Online).
  • Ismar Isidor Boas @ Who Named It

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