BIOL130 Study Guide - Midterm Guide: Valence Electron, Antonie Van Leeuwenhoek, Birds Eye View
10 Nov 2013
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Robert hooke (1635-1703)- invented first microscope and viewed slices of cork ( cellula which means little rooms) Antoni van leeuwenhoek (1632-1723)- worked with glass and made huge improvements in the quality of lenses. He was the first to observe single- celled organisms (animalcule), protists from pond water, sperm, bacteria from his own mouth, blood cells, banded pattern in muscle cells. Progress of the microscope stalled for a century or so because of limited resolving power and the emphasis on description rather than explanation. In the 1830"s the compound microscope was developed with improved magnification and resolution. It allowed visualization of objects less than one micrometer. Robert brown (1833)- botanist that noticed every plant cell contained a round structure (kernel)-nucleus. Matthias schleiden (1838)- another botanist that discovered all plant tissues are composed of cells. He discovered that embryonic plants always arose from a single cell. Theodor schwann (1839)- was a zoologist that had similar observations in animal cells.
