Lecture #15

Lecture #15 - Lecture 15 Growth at Low and High pH Other...

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1 Lecture 15 Lecture 15 Microbial Ecology Methods -Read about them!! Microbial Ecology Methods -Read about them!! BBOM 11e Sec. 18.1-18.2, 18.5, 18.6-18.7 BBOM 11e Sec. 6.13-6.16, 12.34, 13.3, 19.14, 20.2, 20.4-20.6, 20.9, 20.12 Other Factors Affecting Growth Salinity (Low water activity) Oxygen concentration Radiation Antimicrobial Chemical Agents Other Factors Affecting Growth Salinity (Low water activity) Oxygen concentration Growth at Low and High pH Growth at Low and High pH Low and High pH BBOM 11e Sec. 6.13 Alkaliphiles Acidophiles
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2 Extreme Acidophiles Extreme Acidophiles BBOM 11e Sec. 12.4, 13.3, 19.14 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 Extreme Alkaliphiles Extreme Alkaliphiles BBOM 11e Sec. 13.3 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 spp . Sea salt evaporating ponds near San Francisco Lecture 12--ATP is synthesized by a light-driven proton pump pH 8-9
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3 Salinity (Low Water Activity) Salinity (Low Water Activity)
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This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell.

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Lecture #15 - Lecture 15 Growth at Low and High pH Other...

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