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He was responsible for the first isolation and description of both nitrifying and nitrogen-fixing bacteria. [2] French-Canadian microbiologist Felix d'Herelle co-discovered bacteriophages in 1917 and was one of the earliest applied microbiologists. [23] Joseph Lister was the first to use phenol disinfectant on the open wounds of patients. [24]
Griffith's experiment discovering the "transforming principle" in Streptococcus pneumoniae (pneumococcal) bacteria.. Griffith's experiment, [1] performed by Frederick Griffith and reported in 1928, [2] was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation.
He was one of the first scientists to focus on the isolation of bacteria in pure culture. This gave rise to the germ theory, a certain microorganism being responsible for a certain disease. He developed a series of criteria around this that have become known as the Koch's postulates. [7] A major milestone in medical microbiology is the Gram stain.
The first edition of the Bacteriological Code in 1947 set a standardised system and authority for the classification of Bacteria. [30] A. R. Prévot's system (1958) [31] [32]) had four subphyla and eight classes, as follows: Eubacteriales (classes Asporulales and Sporulales) Mycobacteriales (classes Actinomycetales, Myxobacteriales, and ...
Postgate has initiated some, and advanced many, areas of microbiology. He published the first serious biochemical studies of the sulphate-reducing bacteria and discovered cytochrome c-3 (the first cytochrome to be discovered in an anaerobe and the first low-potential cytochrome). He was the first to describe several new types of micro-organisms ...
Nonetheless, Koch was already aware that the causative agent of cholera, Vibrio cholerae, could be found in both sick and healthy people, invalidating his first postulate. [ 6 ] [ 9 ] Since the 1950s, Koch's postulates have been treated as obsolete for epidemiology research, but they are still taught to emphasize historical approaches to ...
Considered to be the first acknowledged microscopist. Van Leeuwenhoek was the first to observe microscopic organisms, using simple single-lensed microscopes of his own design. [1] 1729–1799 Lazzaro Spallanzani: Italian Proved that bacteria did not arise due to spontaneous generation by developing a sealed, sterile broth medium. [2] [3] 1749 ...
[11] [12] In general, transformation is a complex, energy-requiring developmental process that appears to be an adaptation for repairing DNA damage. [ 13 ] Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells.