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The question is debatable as Thonius Philips van Leeuwenhoek (October 24, 1632 - August 30, 1723)1, Dutch scientist first observed the cell nuleus. "In 1682 he clearly described the nucleus within the red blood cells of fish, and in 1683 he noticed the sedimentation of erythrocytes from a suspension and their lysis upon addition of water."2

It was Robert Brown (December 21, 1773-June 10, 1858)3 a Scottish Botanist who observed and gave the name "cell nucleus". Brown, is best known for the discovery of Brownian motion random movement within fluids due to molecular energy of fluid and also used as a mathematical model for Stochastic processes (random i.e. financial markets, atmospheric events).2,4

Some sources site Brown and not van Leeuwenhoek as the discoverer.5

http://en.wikipedia.org/wiki/Anton_van_Leeuwenhoek1 http://www.bookrags.com/Anton_van_Leeuwenhoek2

http://en.wikipedia.org/wiki/Robert_Brown_(botanist)3

http://www.brianjford.com/wbbrowna.htm4

http://science.discovery.com/convergence/100discoveries/big100/Biology.html5

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