1,225
25
Essay, 2 pages (300 words)

Cell theory

Cell Theorypaper, 1838?, 1839? Nageli Kollikers () In 1838, Matthias Jacob Schleiden (1804-1881), a German Botanist, observed nucleoli and said that cells are the units of structure in plants, thus formulating his famous cell theory.

In 1839, a German Zoologist Theodore Schwann (1810” 1882), extended this view of cell concept to animals, i. e., all organisms are composed of cells and cell products. This cell theory resulted from numerous investigations, i. e., of Mirbel (1802), Oken (1805), Lamarck (1809), Dutrochet (1824) and Turpin (1826) and finally by Schleiden (1838) and Schwann (1839). Although Schleiden and Schwann are universally recognised as the founders of cell theory, but its significance was earlier realized by Leeuwenhoek, Grew, Malpighi and others. Wolff (1759) clearly demonstrated the spheres™ and vesicles™ composing the various parts of body.

Later, Meyen, Von Mohl and Raspail clearly defined the cells and thus formulated the cell theory, which was developed by Schleiden and Schwann. The immediate followers of cell theory were Remak, Nageli and Kollikers, etc., who demonstrated the cell division as basis of genetic continuity. Virchow applied the cell theory to pathology and Kolliker extended it to embryology and he demonstrated that organism develops from the fusion of two cells” the sperm and the ovum. Brown (1831) established that the nucleus is a fundamental and constant component of the cell.

Dujardin, Schultze, Purkinje and Von Mohl concentrated on the description of the cell components, termed the protoplasm. Thus, the cell is a mass of protoplasm limited in space by a cell membrane and possessing a nucleus. Recently, organismal theory has been introduced, according to which an organism is regarded as a protoplasmic unit which is incompletely divided (Z-44/C.

B.) into small centres, the cells, for the performance of various biological activities. It is just a modified interpretation of cell theory. Laurence Picken, in The organization of cells (1960), accepts cell as an organism.

At its own level of organization it is a unity, and it remains a unity, though without analytical mental-equipment we conceive it more easily as a plurality of discriminated organelles.() paper? paper -X ()

Thank's for Your Vote!
Cell theory. Page 1
Cell theory. Page 2
Cell theory. Page 3

This work, titled "Cell theory" was written and willingly shared by a fellow student. This sample can be utilized as a research and reference resource to aid in the writing of your own work. Any use of the work that does not include an appropriate citation is banned.

If you are the owner of this work and don’t want it to be published on AssignBuster, request its removal.

Request Removal
Cite this Essay

References

AssignBuster. (2022) 'Cell theory'. 15 January.

Reference

AssignBuster. (2022, January 15). Cell theory. Retrieved from https://assignbuster.com/cell-theory/

References

AssignBuster. 2022. "Cell theory." January 15, 2022. https://assignbuster.com/cell-theory/.

1. AssignBuster. "Cell theory." January 15, 2022. https://assignbuster.com/cell-theory/.


Bibliography


AssignBuster. "Cell theory." January 15, 2022. https://assignbuster.com/cell-theory/.

Work Cited

"Cell theory." AssignBuster, 15 Jan. 2022, assignbuster.com/cell-theory/.

Get in Touch

Please, let us know if you have any ideas on improving Cell theory, or our service. We will be happy to hear what you think: [email protected]