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Hans and Zacharias Janssen
He is thought to have created the first true compound microscope.During the 1590s, the two Dutch spectacle-makers began experimenting. They put several lenses in a tube and made a very important discovery - the object near the end of the tube appeared to be greatly enlarged, much larger than any simple magnifying glass could achieve by itself. -
Robert Hooke
Hooke's reputation in the history of biology largely rests on his book Micrographia, published in 1665. Hooke devised the compound microscope and illumination system, one of the best such microscopes of his time.Hooke was one of the players in the development of half-way decent pocket watches. In 1665, the English physicist Robert Hooke looked at a sliver of cork through a microscope lens and noticed some "pores" or "cells" in it. -
Anton van Leewenhoek
discovered bacteria, free-living and parasiticmicroscopic protists, sperm cells, blood cells, microscopic nematodes and rotifers, and muchmore. "Leuwenhoek made single-lens microscopes with exquisite lenses; with them he becamethe first person to see ciliated protists, which he called "animalcules" and "wretched beasties."He also discovered Hydra, rotifers, andbacteria -
Theodor Schwann
Schwann was the first of Müller's pupils to break with vitalism and work towards a physico-chemical explanation of cells. Schwann's rediscovery of the cell came when he was paying particular attention to the cytoplasm of a plant cell, and noticed its jelly-like consistency. He went on to view animal cells, and noted that they had different properties. Müller also directed Schwann's attention to the proceed of digestion, which Schwann showed in 1837 to depend essentially on the presence of a ferm -
Matthias Schleiden
he wrote Contributions to Phytogenesis (1838), in which he stated that the different parts of the plant organism are composed of cells. Thus, Schleiden and Schwann 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,[1] and sensed its connection with cell division. -
Rudolph Virchow
Virchow is credited with multiple important discoveries. Virchow's most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He is cited as the first to recognize leukemia cells.[2] He was one of the first to accept (and plagiarize[3][4]) the work of Robert Remak who showed that the origins of cells was the division of preexisting cells.
