Sergei Gavrilowitsch Navashin

Sergei Gavrilowitsch Navashin

Sergei Gawrilowitsch Navashin ( Russian Серге́й Гаври́лович Нава́шин ; born December 14, 1857 in Tsaryovshchina , Saratov Governorate , Russian Empire ; † December 10, 1930 in Detskoje selo ) was a Russian botanist.

Life

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

In 1898, Navashin discovered double fertilization in phanerogamous plants. He was able to demonstrate is that at the angiosperms in the embryo sac , a second generative nucleus of the pollen tube occurs, which merges with the secondary core of the embryo sac and a triploid endosperm - the secondary endosperm forms in the future seeds -. He also became known through the evidence of chalazogamy in numerous monochromatic ideas and through the first observation of chromosome satellites .

Individual evidence

1. ↑ Ботанический сад имени акад. А. В. Фомина Homepage of the BGK (Ukrainian) ; Retrieved October 10, 2010