MICR 221 Lecture Notes - Lecture 5: Nanoarchaeum Equitans, Thiomargarita, Dental Plaque

• School: Queen's University
• Department: Microbiology and Immunology
• Course: MICR 221
• Professor: Eric B Carstens

Document Summary

Age of bacteria ph 0 to greater than 12 temps of <0c to >100c concentrated nacl deep sea hydrothermal vents cracks in rocks at depths of several km. 1 gm dental plaque has same number of bacteria 1011 as humans that have ever lived essentially zero! 100 meter depths off coast of chile and peru typically 100-300 um diameter (up to 750 um) in chains of 12 balls. 100 million times larger than e. coli in volume visible with eye (a microbe?: eukaryotic nanochlorum is bacterial size (1-2 um) with nucleus (typical eukaryotic cells are. 10-50um: can"t judge by size if procaryotic/eucaryotic. Water is 2oc at the bottom of the ocean. In immediate vicinity of hydrothermal vents have warm water (like an oasis in desert) In area that is at ~100oc have identified hyperthermophiles. Autoclave designed to kill everything!: maximum temperature where growth observed is 121oc (geogemma barossii, 2003) August 2003, geogemma barossii grows at 121c (250f)