Ferdinand Cohn
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Ferdinand Julius Cohn (January 24, 1828 Breslau, Silesia, Prussia (now Wrocław, Poland) - June 25, 1898 Breslau) was a biologist. At the age of 10 he suffered hearing impairment. He received a degree in Botany in 1847 at the age of nineteen. Cohn was the first to classify bacteria as plants. He also divided bacteria into four groups: Sphaerobacteria, Microbacteria, Desmobacteria, and Spirobacteria. In 1885 he received the Leeuwenhoek Medal.
He is also known for his description of the life cycle of Bacillus and for showing that it changes from a vegetative state to an endospore when subjected to a "hostile" environment (e.g., high heat). Therefore, sterilization by boiling is not effective. It will only kill the bacteria in the vegetative state and the endospores remain viable.
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