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Micro-Organisms of the Mojave Desert. Sara B. Kline March 2001. Background Biology Lesson. Nitrogen Fixation Gram-Positive Gram-Negative Spores. Halobacteria. High alkalinity and salinity Halorhodopsin Owens Lake. Alkaliphiles. pH values Extremozymes. Where’s the Desert??.

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background biology lesson
Background Biology Lesson
  • Nitrogen Fixation
  • Gram-Positive
  • Gram-Negative
  • Spores
halobacteria
Halobacteria
  • High alkalinity and salinity
  • Halorhodopsin
  • Owens Lake
slide4

Alkaliphiles

  • pH values
  • Extremozymes

Where’s the Desert??

mycoplasmas
Mycoplasmas
  • Gram-Negative Prokaryotes
  • Parasitic
  • Respiratory Disease in Desert Tortoises

Cough-Cough!!

slide6

Azotobacter and Streptomycetes

  • A-Gram-neg
  • Bioremediation of Methane products
  • S-gram-pos,
  • Antibiotic Uses
slide7

Protozoa

  • Single-celled eukaryotic
  • Parasitic
  • Cellulase breakdown
cyanobacteria
Cyanobacteria
  • AKA- blue-green algae
  • Prokaryotic, photosynthetic
  • Hepatoxins in blooms
  • Dunaliella
fungi
Fungi
  • Penicilluim
  • Erosional properties
  • Mycorrhizae
lichens
Lichens
  • Symbiotic Relationship
  • Alga= Photosynthesis
  • Fungi=Protection
  • Crustose Lichens
  • Tardigrades
desert varnish
Desert Varnish
  • 30% Manganese and Iron Fixed
  • Other Components= Si, Al, Mg, K,Ca
  • Metallogenium, Pedomicrobium and Fungi
  • Travertine is not Varnish
  • Magnetite and Aging
  • Environmental Risks of Alkalinity
main sources
Main Sources
  • “Extremophiles.” Scientific American. April 1997; p82-88.
  • “How Fast Does Desert Varnish Grow??” Geomicrobiology Journal. August 1992, v.10.
  • “Rock Varnish.” Geology. February 2000, v.28.
  • “In Industry, Extremophiles Begin to make their Mark.” Science. 2 May 1997, v.276.
  • Desert Landforms. Singapore: Australian National University Press, 1977.
  • Abrahams, Athol. Geomorphology of Desert Environments. New York: Chapman & Hall, 1994.
  • Encyclopedia Britannica Online. Http://search.eb.com/bol/Topic?