lecture 4 spring 09

lecture 4 spring 09 - Microbial Diversity Microbes are...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Microbial Diversity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Microbes are everywhere Different habitats provide different physical attributes and different nutrients. -Controlling factors, selection Thus, the microbial community varies depending on the habitat.
Background image of page 2
Think microscopically
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Soil Particle Silt, sand, rock Organic matter Microbes Aerobic and anaerobic zones
Background image of page 4
Soil- what’s limiting microbial diversity? Large amount of complex organics Dead plants and animals, waste Moderate temperature (4- 45°C) Moderate pH Heterogeneous environment Gradients of chemicals (oxygen) Two general layers Surface
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Microbial Diversity of Soil Dizzying numbers 1-10 billion cells per gram of soil 3,000 to 106 species Most are uncharacterized!
Background image of page 6
DEGRADATION of soil nutrients requires microbial collaboration: Depolymerization - Fungi, Streptomyces. Cytophaga, Bacillus, Clostridium
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Marine ecosystems (surface) Physical parameters Light exposure (to 150 m) Temperature 4 - 37°C pH - about 7.6 Nutrients Ions - Na+, Cl-, Mg2+, SO42-, Ca2+, K+, HCO 3 - Low in organic matter vs soil
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Marine Microorganisms Photosynthetics dominate Synechococcus Prochlorococcus Trichodesium SAR86 (not cultured) Proteorhodopsin for energy from light Important primary producer (provides for other microbes) Bloo Trichodes ium
Background image of page 10
Marine Microorganisms cont. Chitin degraders very important Chemoheterotrophs Alteromonas Marinomonas Photobacterium and Vibrio Pelagibacter ubique Previously unculturable 25% of ocean biomass Grows on dilute nutrients @ 15°C, 23 days to grow up Small Vib rio Photobacte rium
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 36

lecture 4 spring 09 - Microbial Diversity Microbes are...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online