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They created the compound microscope.
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Schleiden became the first to formulate what was then an informal belief as a principle of biology equal in importance to the atomic theory of chemistry. He also recognized the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown, and sensed its connection with cell division.
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used microscopes to view many things including pond organisms, bacteria and blood cells. He made careful sketches of what he observed.
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In 1838 Schleiden proposed that all plants are composed of cells;
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The theory states that all living things are made up of one or more cells.
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writes and publishes his aphorism omnis cellula e cellula, which means every cell stems from another cell.