Cohn , Ferdinand Julius
(1828–1898) German botanist and bacteriologist
Cohn, who was born in Breslau (now Wrocław in Poland), was an extremely intelligent child and progressed through school rapidly, being admitted to the philosophy department at Breslau University at the early age of 14. He later developed an interest in botany but was prevented from graduating at Breslau by the university's anti-Semitic regulations. He therefore moved to Berlin, where he received his doctorate in botany in 1847.
Cohn returned to Breslau, becoming professor of botany there in 1872. He had long argued that the state should be responsible for the establishment of botanical research institutes, and as a result of his campaign the world's first institute for plant physiology was set up in Breslau in 1866. Cohn was director of this institute until his death and in 1870 he founded the journal Beiträge zur Biologie der Pflanzen, mainly for the purpose of publishing work carried out at Breslau.
Cohn's early research concentrated on the morphology and life histories of the microscopic algae and fungi, which led to his demonstration that the protoplasm of plant and animal cells is essentially similar. Later, stimulated by the work of Louis Pasteur, he became increasingly interested in bacteria. His classic treatise Untersuchungen über Bacterien (Researches on Bacteria), published in his journal in 1872, laid the foundations of modern bacteriology. In it he defined bacteria, used the constancy of their external form to divide them into four groups, and described six genera under these groups. This widely accepted classification was the first systematic attempt to classify bacteria and its fundamental divisions are still used in today's nomenclature.
Although Cohn did not believe in the theory of spontaneous generation he was aware that bacteria could develop in boiled infusions kept in sealed containers. He postulated the existence of a resistant developmental stage and through careful observation was able to demonstrate the formation of heat-resistant spores by Bacillus subtilis.
Through his book Die Pflanze (1872) and the printing of many of his popular lectures, Cohn presented the study of biology to a wide and appreciative public. He was also responsible for the publication of Robert Koch's important work on the life cycle of the anthrax bacillus.

Scientists. . 2011.

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  • COHN, FERDINAND JULIUS — (1828–1898), German botanist and pioneer bacteriologist. Cohn was born in Breslau, the eldest son of Isaac Cohn, who held the post of Austro Hungarian consul. He joined the faculty of the University of Breslau in 1851 as a lecturer in botany and… …   Encyclopedia of Judaism

  • Cohn,Ferdinand Julius — Cohn (kōn), Ferdinand Julius. 1828 1898. German botanist who is considered the founder of bacteriology. He was the first to recognize bacteria as plants. * * * …   Universalium

  • Cohn, Ferdinand (Julius) — (24 ene. 1828, Breslau, Silesia, Prusia–25 jun. 1898, Breslau). Naturalista y botánico alemán, considerado uno de los fundadores de la bacteriología. Obtuvo su Ph.D. en la Universidad de Berlín a la edad de 19 años. Sus primeras investigaciones… …   Enciclopedia Universal

  • Cohn, Ferdinand (Julius) — born Jan. 24, 1828, Breslau, Silesia, Prussia died June 25, 1898, Breslau German naturalist and botanist, considered one of the founders of bacteriology. He received a Ph.D. from the University of Berlin at age 19. His early research centred on… …   Universalium

  • Cohn, Ferdinand Julius — (1828 93)    German botanist and bacteriologist. Born in Breslau, he studied at the universities of Breslau and Berlin. In 1850 he became a lecturer at Breslau University, and later professor. In 1854 he published the first monograph on… …   Dictionary of Jewish Biography

  • Ferdinand Julius Cohn — Ferdinand Julius Cohn. Ferdinand Julius Cohn (* 24. Januar 1828 in Breslau; † 25. Juni 1898 ebenda) war ein deutscher Botaniker und Mikrobiologe. Er gilt neben Robert Koch als einer der Begründer der modernen Bakteriologie. Sein offizielles… …   Deutsch Wikipedia

  • Ferdinand Julius Cohn — Pour les articles homonymes, voir Cohn. Ferdinand Julius Cohn. Ferdinand Julius Cohn est un botaniste et un microbiologiste allemand, né le 24 janvier 1828 à …   Wikipédia en Français

  • Ferdinand Julius Cohn — noun German botanist who is generally recognized as founding bacteriology when he recognized bacteria as plants • Syn: ↑Cohn • Instance Hypernyms: ↑botanist, ↑phytologist, ↑plant scientist …   Useful english dictionary

  • Ferdinand Cohn — Ferdinand Julius Cohn. Ferdinand Julius Cohn (* 24. Januar 1828 in Breslau; † 25. Juni 1898 ebenda) war ein deutscher Botaniker und Mikrobiologe. Er gilt neben Robert Koch als einer der Begründer der modernen Bakteriologie. Sein offizielles …   Deutsch Wikipedia

  • Ferdinand Cohn — Ferdinand Julius Cohn. Ferdinand Julius Cohn, ( Breslau, 24 de enero de 1828 – Breslau, 25 de junio de 1898 ) fue un botánico y bacteriólogo alemán. Contenido …   Wikipedia Español

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