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Historical series
The first major bacteria watched Antonie van Leeuwenhoek in 1683 using first microscope of his own design. Long after its discovery was only investigated the morphology of these microorganisms, but not their effect in living nature. Name of bacteria much later (1828) by Christian Gottfried Ehrenberg, from Gk. bacterium which means "wand, stick". The founders of scientific and experimental bacteriology as Louis Pasteur (1822-1895) and Robert Koch (1843-1910).
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If the 9th Century recipe does lead to new drugs, they might be useful against MRSA skin infections such as those that cause foot ulcers in people with diabetes. "These are usually antibiotic-resistant....
It seems that people in the past have developed some studies long before they discovered bacteria,but how did they menaged to see without microscope?