When were bacteria discovered?

When werebacteria discovered?
Dutch scientist Antonie Phillips van Leeuwenhoek (Anton van Leeuwenhoek; 1632–1723),also a fabric merchant and civil servant, discovered bacteria and other microorganisms in 1674 when he looked at a drop of pond water through a glass lens. 
In the  Early Centuries  single lens instrument  which produced magnification of fifty to 300 times real size. These are primitive microscope which provided perspective into the previously unknown world of small organisms,  van Leeuwenhoek called  these as “animalcules” in a letter he wrote his all ovservation  to the Royal Society of London.

After  the  discovery of bacteria change the theory of spontaneous generation which believe  earlier by scientist-

The theory of spontaneous generation prepossessed that "life can arise spontaneously from nonliving matter"  The first scientists who challenge this theory that  the was an Italian physician Francesco Redi (1626–1698).

 In the year  1668, Francesco Redi  who performed an experiment which  shown that meat placed in covered containers either glass-covered or gauze-covered remained free of maggots, while meat left in an uncovered container eventually became infested with maggots from flies laying their eggs on the meat. 
The controversy over spontaneous generation was finally solved in 1861 by Frenchc chemistLouis Pasteur (1822–1895). He showed that the microorganisms found ins spoiledfood were similar to those found in the air—and thus concluded that the microorganisms on spoiled food were from the air and did not spontaneously arise.

Who were the founders of modern bacteriology?

French chemist Louis Pasteur (1822–1895) and German bacteriologist Robert Koch(1843–1910) are considered the founders of bacteriology. In 1864, Pasteur devised a way to slowly heat foods and beverages to a high enough temperature to kill most of the microorganisms responsible for spoilage and disease. This method would not ruin or curdle the food—and is a process we now call pasteurization.

In 1882—by demonstrating that tuberculosis was an infectious disease caused by a

specific bacterial species of Bacillus—Robert Koch set the groundwork for public-health measures that would reduce the occurrence of many diseases. His laboratory procedures, methodologies for isolating microorganisms.
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