BISC300 Lecture Notes - Lecture 7: Francesco Redi, Louis Pasteur, Tiny Living
27 Nov 2016
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Creator of the first microscope: anton van leuwenhoek. In 1673, he used a handmade microscope to observe pond water and discovered single-celled organisms he called animalcules (they moved like animalcules) They often based things on religion in medieval times: their conclusions were based on untested observations, spontaneous generation is the proposal that living organisms can arise from nonliving matter, medieval beliefs. Microbes were thought to arise from broth. Maggots were thought to arise from meat. Mice were thought to arise from mixtures of sweaty shirts and wheat. Spallaza(cid:374)"s h(cid:455)pothesis: (cid:373)i(cid:272)ro(cid:271)es (cid:272)o(cid:373)e fro(cid:373) the air. Boili(cid:374)g (cid:449)ill kill the(cid:373): fre(cid:374)(cid:272)h (cid:272)he(cid:373)ist louis pasteur"s desig(cid:374) of this e(cid:454)peri(cid:373)e(cid:374)t settled the argu(cid:373)e(cid:374)t. Experiments disproving spontaneous generation: francesco redi 1668 experiment. Broth was boiled in various flasks for one hour to sterilize it and allowed to cool, drawing in fresh air. The open flask allowed air and any bacteria present in the air to enter; became contaminated with bacteria.
