BIOL 111 Lecture Notes - Lecture 3: Microorganism, Archaea, Optical Microscope

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Graham Bell

Document Summary

Smallest object men can naturally see: lmin =2d/tan (a/2) = 30 um. Invisible world (1/2 of the world): 1 a 10 um. Shadow world (1/4 of the world): 10 um 1 cm. Can"t be studied (viewable but too small) >1300 : magnifying glasses spectacles (maybe da pisa) *2. >1650 : hooke : microscopy : the cell *50. 1684: van leeuwenhoek: -> first drawing of bacteria in human history. Louis pasteur: 1870s: invisible microbes are responsible for fermentation, sepsis and disease. About 3. 8 billion years ago, the oceans were filled with prokaryotes. Out of the thousands that were in there, only one survived, the one we all descend from. This organism is called luca (last universal common ancestor), who was a chemoautotrophic prokaryote. With the existence of rna in the water and the presence of organic compounds such as h2, co2 (key to prebiotic chemistry), genes, proteins and cells were created.