Rizzo_lect9

Rizzo_lect9 - 1 Key topics so far The three domains and...

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2 Key topics so far The three domains and their differences Importance of microbes Importance of rRNA in microbe phylogeny Key characters of prokaryotes Importance of unculturable microbes Lateral gene transfer
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3 Orange: some members culturable Blue: known only from environmental samples
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4 Key topics today Biofilms Gram stain Metabolism Major groups of bacteria Extremophiles Human-associated prokaryotes
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6 Biofilms are composed of : 1. A protein gel on a surface that supports random cells of one to a few bacterial species 2. A community of microbes embedded in a polysaccharide matrix 3. A community of microbes embedded in a lipid matrix 4. A polysaccharide gel that is excreted onto a surface by bacteria while they are dying
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8 Biofilms- key features Extracellular polysaccharide matrix Surface attachment Solid surfaces Soft tissue in living organisms Liquid-air interface Structural heterogeneity Genetic diversity- bacteria, archaea, protists, fungi, algae
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This document was uploaded on 04/02/2009.

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Rizzo_lect9 - 1 Key topics so far The three domains and...

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