Theodor Schwann: Difference between revisions
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==Vitalism and germ theory== |
==Vitalism and germ theory== |
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Schwann was thus the first of Müller's pupils who broke with the traditional [[vitalism]] and worked towards a physico-chemical explanation of [[life]].He came to discover the cell one day when he was paying particular attention to the cytoplasm of the plant cell he noticed its jelly like consistency and then went on to view the animal cell which did not have one and noted that they had different properties. |
Schwann was thus the first of Müller's pupils who broke with the traditional [[vitalism]] and worked towards a physico-chemical explanation of [[life]].He came to discover the cell one day when he was paying particular attention to the cytoplasm of the plant cell he noticed its jelly like consistency and then went on to view the animal cell which did not have one and noted that they had different properties. |
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i like big cack in my butthole |
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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 [[fermentation (biochemistry)|ferment]] he called [[pepsin]]. Schwann also examined the question of [[spontaneous generation]], which led to its eventual disproof. In the course of his experiments, he discovered the organic nature of [[yeast]]. In fact the whole [[germ theory]] of [[Louis Pasteur |Pasteur]], as well as its [[antiseptic]] applications by [[Joseph Lister |Lister]], can be traced to Schwann's influence. |
Müller also directed Schwann's attention to the process of [[digestion]], which Schwann showed in 1837 to depend essentially on the presence of a [[fermentation (biochemistry)|ferment]] he called [[pepsin]]. Schwann also examined the question of [[spontaneous generation]], which led to its eventual disproof. In the course of his experiments, he discovered the organic nature of [[yeast]]. In fact the whole [[germ theory]] of [[Louis Pasteur |Pasteur]], as well as its [[antiseptic]] applications by [[Joseph Lister |Lister]], can be traced to Schwann's influence. |
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Revision as of 15:50, 30 September 2008
- Not to be confused with army general Theodore Schwan.
Theodor Schwann | |
|---|---|
 Theodor Schwann | |
| Born | December 7, 1810 |
| Died | January 11, 1882 |
| Nationality | German |
| Known for | Schwann cells |
| Scientific career | |
| Fields | zoology |
Theodor Schwann (December 7, 1810 – January 11, 1882) was a German zoologist. His many contributions to biology include the development of cell theory, the discovery of Schwann cells in the peripheral nervous system, the discovery and study of pepsin, the discovery of the organic nature of yeast, and the invention of the term metabolism.
Vitalism and germ theory
Schwann was thus the first of Müller's pupils who broke with the traditional vitalism and worked towards a physico-chemical explanation of life.He came to discover the cell one day when he was paying particular attention to the cytoplasm of the plant cell he noticed its jelly like consistency and then went on to view the animal cell which did not have one and noted that they had different properties. i like big cack in my butthole 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. Schwann also examined the question of spontaneous generation, which led to its eventual disproof. In the course of his experiments, he discovered the organic nature of yeast. In fact the whole germ theory of Pasteur, as well as its antiseptic applications by Lister, can be traced to Schwann's influence.
Theory
Once, when Schwann was dining with Matthias Jakob Schleiden (who in 1837 had viewed and stated that new plant cells formed from the nuclei of old plant cells) in 1837, the conversation turned on the nuclei of plants and animal cells. Schwann remembered seeing similar structures in the cells of the notochord (as had been shown by Müller) and instantly realized the importance of connecting the two phenomena. The resemblance was confirmed without delay by both observers, and the results soon appeared in his famous Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals, in which he declared that "All living things are composed of cells and cell products." scanned source(Berlin, 1839; trans. Sydenham Society, 1847). Thus cell theory was definitely constituted. In the course of his verification of cell theory, in which Schwann traversed the whole field of histology, he proved the cellular origin and development of the most highly differentiated tissues including nails, feathers, and tooth enamel.
His generalization became the foundation of modern histology, and in the hands of Rudolf Virchow (whose cellular pathology was an inevitable deduction from Schwann) afforded the means of placing modern pathology on a truly scientific basis.
References
- Aszmann, O C (2000). "The life and work of Theodore Schwann". Journal of reconstructive microsurgery. 16 (4). UNITED STATES: 291–5. ISSN 0743-684X. PMID 10871087.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Kosinski, C M (2004). "[Theodor Schwann]". Der Nervenarzt. 75 (12). Germany: 1248. doi:10.1007/s00115-004-1805-5. ISSN 0028-2804. PMID 15368056.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Haas, L F (1999). "Neurological stamp. Theodore Schwann (1810-82)". J. Neurol. Neurosurg. Psychiatr. 66 (1). ENGLAND: 103. ISSN 0022-3050. PMID 9886465.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Hayashi, M (1992). "[Theodor Schwann and reductionism]". [[Kagakushi kenkyu. [Journal of the history of science, Japan]]. 31 (184). JAPAN: 209–14. ISSN 0022-7692. PMID 11639601.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=,|laysummary=, and|month=(help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Kruta, V (1987). "The idea of the primary unity of elements in the microscopic structure of animals and plants. J. E. Purkynĕ and Th. Schwann". Folia mendeliana. 22. CZECH REPUBLIC: 35–50. ISSN 0085-0748. PMID 11621603.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=,|laysummary=, and|month=(help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Kiszely, G (1983). "[Theodor Schwann]". Orvosi hetilap. 124 (16). HUNGARY: 959–62. ISSN 0030-6002. PMID 6343953.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Lukács, D (1982). "[Centenary of the death of Theodor Schwann]". Orvosi hetilap. 123 (14). HUNGARY: 864–6. ISSN 0030-6002. PMID 7043357.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - Watermann, R (1973). "[Theodor Schwann accepted the honorable appointment abroad]". Medizinische Monatsschrift. 27 (1). GERMANY, WEST: 28–31. ISSN 0025-8474. PMID 4576700.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - WATERMANN, R (1960). "[Theodor SCHWANN as a maker of lifesaving apparatus.]". Die Medizinische Welt. 50. Not Available: 2682–7. ISSN 0025-8512. PMID 13783359.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1958). "[Episodes in medicine of the people from Liège: Schwann & the stigmatized.]". Revue médicale de Liège. 13 (18). Not Available: 627–38. ISSN 0370-629X. PMID 13591909.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1957). "[1838; Year of crisis in the life of Théodore Schwann.]". Revue médicale de Liège. 12 (18). Not Available: 503–10. ISSN 0370-629X. PMID 13466730.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1957). "[Discovery of pepsin by Theodor Schwann.]". Revue médicale de Liège. 12 (5). Not Available: 139–44. ISSN 0370-629X. PMID 13432398.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1951). "[Schwann as medical student.]". Revue médicale de Liège. 6 (22). Not Available: 771–7. ISSN 0370-629X. PMID 14892596.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1951). "[Schwann at the Tricoronatum.]". Revue médicale de Liège. 6 (20). Not Available: 696–703. ISSN 0370-629X. PMID 14883601.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link) - FLORKIN, M (1951). "[The family and childhood of Schwann.]". Revue médicale de Liège. 6 (9). Not Available: 231–8. ISSN 0370-629X. PMID 14845235.
{{cite journal}}: Check date values in:|year=(help); Cite has empty unknown parameters:|laydate=,|laysource=, and|laysummary=(help); Unknown parameter|month=ignored (help); Unknown parameter|quotes=ignored (help)CS1 maint: year (link)