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Zachrias, with the help of his father, invented the optical microscope.
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He is known as the "English Father of microscopy". In 1660 he discovered the law of elasticity, which describes the linear variation of tension with extension in an elastic spring.
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He is known as " The Father of Microscopy". In 1673 he looked at pond scum under a microscope and discovered small animals that he called animalcules.
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He discovered the infusoria in 1674.
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He recognized the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown.
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Müller also directed Schwann's attention to the process of digestion, which Schwann showed in 1837 to depend essentially on the presence of a ferment he called pepsin.
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He was a German doctor, anthropologist, pathologist, prehistorian, biologist and politician.He is referred to as "the father of modern pathology."In 1847, he qualified as a lecturer at the University of Berlin, and in that year also he was associated with Benno Reinhardt in founding the Archiv für pathologische Anatomie und Physiologie und für klinische Medizin, world-famous as “Virchow's Archives."