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Hooke
Robert Hooke was an English scientist that discovered plant cells. Hooke made this discovery using an early form of a compound microscope. Using this microscope, Hooke observed the honeycomb-like organization of the cell walls. He could only see the cell walls due to the fact that the cork cells were dead and therefore lacked protoplasm. -
Leeuwenhoek
Using a microscope, with lenses he created, Anton van Leeuwenhoek was the first to observe red blood cells and sperm cells of both humans and animals. Leeuwenhoek made over 400 microscopes in his time, some of which could magnify objects about 275x. He continued on to use his microscope to be the first to observe and describe protozoa; he wrote to the Royal Society describing them. He furthered Hooke's theory by explaining that cells are not empty. He was first to catch glimpse of the nucleus. -
Brown
Using a microscope to study and observe cells of Asclepiads and orchids, Robert Brown discovered the nucleus of a plant cell. -
Schleiden
Matthias Schleiden determined that cells are the basic building block of all plant matter. He also resolved that an embryonic plant derived from a single cell and that all plant tissue is made up of cells. Most botanists before him only described and named the plants, while he went further by using a microscope to determine their cellular makeup and the production of new cells to make he plant grow. -
Schwann
Theodor Schwann made the second generalization concerning cells, he stated that cells are organisms and all organisms consist of one or more cells and cells are the basic unit of structure for all organisms and that plants and animals consist of combinations of cells which are arranged with definite rules. This disproved Schleiden's theory that cells only made up plant life, but they in fact make up all living material. He composed his theory by pulling together already existing observations. -
Virchow
Along with help from Karl Nageli, Rudolf Virchow added a third statement to the cell theory: cells develop from previously existing cells. While researching at Berlin University's pathological institute, he established that the cell theory applies to not only healthy tissue, but diseased tissue as well. -
Bibliography
"Discovery of Cells and the Development of Cell Theory." Discovery of Cells and the Development of Cell Theory. N.p., n.d. Web. 05 Oct. 2016. Science-Of-Aging. "Timeline of Cell Discoveries." Cell History Timeline. N.p., 2008. Web. 06 Oct. 2016. Waggoner, Ben. Honeycomb-like cell organization. Digital image. Ucmp.berkeley.edu. Regents of the University of California, 1994. Web. 6 Oct. 2016. Digital image. Discoveries-project.weebly.com. N.p., n.d. Web. 6 Oct. 2016. -
Bibliography (con)
Living orchid cells as seen through a microscope from 1825. Digital image. Www.ice.cam.ac.uk. University of Cambridge, 2015. Web. 6 Oct. 2016. Pao, Ah. Plant Cells Leaf. Digital image. Thinking Allowed. WordPress, 11 Mar. 2011. Web. 6 Oct. 2016. Schleiden's incorrect view of cell division, from his work "Grundzüge der wiss. Botanik" Digital image. Science of Aging. N.p., n.d. Web. 6 Oct. 2016. Remak. Remak's view of cell division. Digital image. Science of Aging. N.p., n.d. Web. 6 Oct. 2016.
