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Hans and Zacharias Janssen were the inventors of the first compound microscope.
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Robert Hooke looked at a sliver of cork through a microscope lens and noticed some "pores" or "cells" in it. He was the first person to use the word "cell" to identify the small box like structures when he was describing cork
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Antony van Leeuwenhoek described observations on lake water, including a description of the green charophyte alga Spirogyra.He also improved the microscope.
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Robert Brown discovered the cell nucleus
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Matthias Schleiden stated that the different parts of the plant organism are composed of cells. He also recognized the importance of the cell nucleus, discovered in 1831 by the Robert Brown connected it with cell division.
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Theodor Schwann extended Schleiden's cell theory to animals, stating that all living things are composed of cells. He also believed that new cells form outside pre-existing cells.
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Matthias Schleiden, Theodor Schwann and Rudolf Virchow were the co-founders of cell theory. Cell theory is the ideas that all living matter consists of cells, cells are the basic unit of structure of all living things and all cells come from preexisting cells.
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Rudolf Virchow proposed an important extension of cell theory that "All living cells arise from pre-existing cells".
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Richard Altman identified the mitochondria using a dye technique, and called them "bioblasts"
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Germans, Max Knoll and Ernst Ruska co-invented the electron microscope. Electron microscopes are scientific instruments that use a beam of electrons to examine objects on a very fine scale
