first to describe microorganisms, coined the term cells
AntonivonLeeuwenhoek
first to describe bacterial cells "wee animalcules"
Ferdinand Cohn
defined bacteria's characteristics, reproduction, and life style. Established journal of bacteriology and practices
Louis Pasteur
microbes and yeast production from fermentation, disproof of spontaneous generation, developed vaccines to rabies, chicken cholera, and anthrax (flask experiment)
Robert Koch
developed methods for pure cultures, discovered cause of tuberculosis (germ theory of disease), mice experiment w diseased cells
MartinusBeijerinck
microbial selection, described viruses
SergeiWinogradsky
developed concept of chemolithotrophy, discovered several species