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Ferdinand Cohn

 
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Ferdinand Julius Cohn (24 January 1828 – 25 June 1898) was a German
Germany

Germany , officially the Federal Republic of Germany , is a country in Central Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands....
 biologist
Biologist

A biologist is a scientist devoted to and producing results in biology through the study of life.Typically biologists study organisms and their relationship to their environment....
.

Cohn was born in Breslau (Wroclaw)
Wroclaw

Wroclaw is the chief city of the historical region of Lower Silesia in south-western Poland, situated on the Oder River river. Over the centuries the city has been part of Kingdom of Poland , Bohemia, Austria, Prussia, and Germany....
 in the Prussian
Kingdom of Prussia

The Kingdom of Prussia was a Germany monarchy from 1701 to 1918 and, from 1871, was the leading state of the German Empire, comprising almost two-thirds of the area of the empire....
 Province of Silesia
Province of Silesia

The Province of Silesia was a Provinces of Prussia of the Kingdom of Prussia from 1815 to 1919; the territory had been conquered from Habsburg Monarchy during the 18th century Silesian Wars....
. At the age of 10 he suffered hearing impairment. He received a degree in botany
Botany

Botany, plant science, phytology, or plant biology is a branch of biology and is the Scientific method of plant life and development....
 in 1847 at the age of nineteen at the University of Berlin.






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Ferdinand Julius Cohn 1828 1898
Ferdinand Julius Cohn (24 January 1828 – 25 June 1898) was a German
Germany

Germany , officially the Federal Republic of Germany , is a country in Central Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands....
 biologist
Biologist

A biologist is a scientist devoted to and producing results in biology through the study of life.Typically biologists study organisms and their relationship to their environment....
.

Cohn was born in Breslau (Wroclaw)
Wroclaw

Wroclaw is the chief city of the historical region of Lower Silesia in south-western Poland, situated on the Oder River river. Over the centuries the city has been part of Kingdom of Poland , Bohemia, Austria, Prussia, and Germany....
 in the Prussian
Kingdom of Prussia

The Kingdom of Prussia was a Germany monarchy from 1701 to 1918 and, from 1871, was the leading state of the German Empire, comprising almost two-thirds of the area of the empire....
 Province of Silesia
Province of Silesia

The Province of Silesia was a Provinces of Prussia of the Kingdom of Prussia from 1815 to 1919; the territory had been conquered from Habsburg Monarchy during the 18th century Silesian Wars....
. At the age of 10 he suffered hearing impairment. He received a degree in botany
Botany

Botany, plant science, phytology, or plant biology is a branch of biology and is the Scientific method of plant life and development....
 in 1847 at the age of nineteen at the University of Berlin. He was a teacher and researcher at University of Breslau for his entire career. In the 1850s he mostly studied algae. In the 1860s he studied plant physiology in several different aspects. From 1870 onward he mostly studied bacteria. He published over 150 research reports during his lifetime. The University of Breslau became an innovative center for plant physiology and microbiology while he was there.

Cohn was the first to classify bacteria
Bacteria

The Bacteria are a large group of unicellular microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals....
 as plant
Plant

Plants are Life organisms belonging to the Kingdom Plantae. They include familiar organisms such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae....
s, and to define what distinguishes them from green plants. His classification of bacteria into four groups based on shape (sphericals, short rods, threads, and spirals) is still used today. Among other things Cohn is remembered today for being the first to show (1876) that Bacillus
Bacillus

Bacillus is a genus of rod-shaped bacterium and a member of the division Firmicutes. Bacillus species are either obligate or facultative aerobes, and test positive for the enzyme catalase....
 can change from a vegetative state to an endospore
Endospore

An endospore is a dormancy, tough, and non-reproductive structure produced by bacteria from the Firmicute phylum. Examples include Bacillus and Clostridium....
 state when subjected to an environment deleterious to the vegetative state.

In 1885 he received the Leeuwenhoek Medal
Leeuwenhoek Medal

The Leeuwenhoek Medal, established in 1877 by the Koninklijke Nederlandse Akademie van Wetenschappen, , in honor of the 17th- and 18th-century microscopeist Antoni van Leeuwenhoek, is granted every ten years to the scientist judged to have made the most significant contribution to microbiology during the preceding decade....
.

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