1. Microbiology (from Greek μῑκρος, mīkros, "small"; βίος, bios, "life"; and -λογία, -logia) is the study of microscopic organisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells).

Born: December 27, 1822, Died: September 28, 1895 Louis Pasteur was a French chemist and microbiologist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization