Lecture 15 - Lecture 15 Virtual Field Trip: Yellowstone...

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1 Lecture 15 BBOM 12e Sec. 6.15-6.18, 20.11, 15.4, 16.17, 17.3, 17.5, 27.2 Other Factors Affecting Growth Salinity (Low water activity) Oxygen concentration Radiation Antimicrobial Chemical Agents Low and High pH Virtual Field Trip: Yellowstone National Park T.D.Brock Dept. of Bacteriology University of Wisconsin-Madison Life at High Temperatures http://www.bact.wisc.edu/themicrobialworld/LAHT/B1 Yellowstone National Park
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2 Low and High pH BBOM 12e Sec. 6.15 Alkaliphiles Acidophiles Extreme Acidophiles BBOM 12e Sec. 20.11, 15.4, 17.5 Thermoplasma spp . (pH 2) (Archaea) Acid mine drainage Thiobacillus ferrooxidans (pH 2-4) (Bacteria) Ferroplasma acidophilum (pH 0) (Archaea) -- thrives in 1M acid! An ultra acidophilic archaeon found in acid mines Single layer cell envelope (cell membrane only). Lipid bilayer contains a unique covalently inked tetraether lipidglycan One advantage of Living at low pH: cells get PMF from the high H+ concentration in their environment! Acid outside cell, neutral inside Coal refuse pile Lives on sulfur or iron oxidation – Produces sulfuric acid!
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3 Extreme Alkaliphiles BBOM 12e Sec. 17.3 Halophilic Alkaliphiles in a Soda Lake pH 10 Some alkaliphiles use Na+ gradient to drive motility and transport PMF is used mainly for ATP synthesis Halobacterium
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This note was uploaded on 10/25/2009 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell University (Engineering School).

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Lecture 15 - Lecture 15 Virtual Field Trip: Yellowstone...

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