Sergei Navashin

Sergei Gawrilowitsch Nawaschin ( born December 14, 1857 in Carevscin in Saratov, Russia, † December 10, 1930 in Detskoe selo in Puschkino ) was a Russian botanist.

Nawaschin studied medicine from 1874 to 1878 at the University of Petersburg, then to 1881 in Moscow. There his teachers, among others Kliment Timiryazev were, chemistry he studied with Vladimir Markovnikov. In 1888 he became a research assistant in St. Petersburg, 1888 Wizard of Ivan Borodin at the University of Petersburg, in which he received his Ph.D. in botany in 1894. From 1894 to 1915 Nawaschin was a professor at the University of Kiev and headed until 1914, the associated Botanical Garden Kiev ( BGK ). After that he went for health reasons to Tbilisi, where he was from 1918 to 1923 professor at the university. In 1923 he was offered a professorship at the University of Moscow, where he built the Timiryazev Institute, whose director he was until 1929. Since 1908 he was a corresponding member of the Bavarian Academy of Sciences.

Nawaschin discovered in 1898 the so-called double fertilization in plants phanerogamous. He was able to show here that in the angiosperms in the embryo sac, a second generative nucleus of the pollen tube enters, which fuses with the secondary nucleus of the embryo sac and a triploid endosperm - the secondary endosperm - forms in the future seeds. He was also known by the detection of Chalazogamie in numerous Monochlamydeen and the first observation of chromosomes satellites.