Louis Pasteur: He was a French microbiologist born in 1822. He discovered pasteurization, fermentation process, the principle of vaccination etc. He found Germ theory of disease along with Robert Koch. He is regarded as father of microbiology. He discovered vaccine for rabies and anthrax. He shows that many microbes spoil beverages like alcohol, beer, milk etc. So he invented a process called pasteurization where liquids like milk are heated to 60-100oC where most microbes get killed and then cooled suddenly. This process prevents the spoilage of liquids like alcohol, milk etc. He founded an institute which bears his name. He has worked a lot on sericulture too.