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The first time the word

cell

was used to refer to these tiny units of life was in 1665 by a British scientist named Robert Hooke. Hooke was one of the earliest scientists to study living things under a microscope

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This was a microscope in the late 1600s

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Present day microscope

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Behrens used differential centrifugation to separate nuclei from cytoplasm.Siemens produced the first commercial transmission electron microscope.Ham introduced a defined serum-free medium. Cambridge Instruments produced the first commercial scanning electron microscope.

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By the early 1800s, scientists had observed the cells of many different organisms. These observations led two German scientists, named Theodor Schwann and Matthias Jakob Schleiden, to propose that cells are the basic building blocks of all living things.

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In 1595,
Jansen credited with 1st compound microscope

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In 1840,Albrecht von Roelliker realized that sperm cells and egg cells are also cells