Classifying Bacteria • Bergey’s Manual of Systematic Bacteriology – Classifies bacteria via evolutionary or genetic relationships. • Bergey’s Manual of Determinative Bacteriology – Classifies bacteria by cell wall composition, morphology, biochemical tests, differential staining, etc.
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Classifying Bacteria Bergey’s Manual of Systematic Bacteriology –Classifies bacteria via evolutionary or genetic relationships. Bergey’s Manual of Determinative.
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Classifying Bacteria
• Bergey’s Manual of Systematic Bacteriology– Classifies bacteria via evolutionary or genetic
relationships.
• Bergey’s Manual of Determinative Bacteriology– Classifies bacteria by cell wall composition,
morphology, biochemical tests, differential staining, etc.
Prokaryotic Organisms
• Prokaryotic-means pre-nucleus.– Genetic material not enclosed in a special
nuclear membrane.– What are the other differences between
Prokaryotic and Eukaryotic organisms.
• Prokaryotic organisms are split into two Domains.– Bacteria– Archaea
The Prokaryotes
Domain Bacteria
• Phylum Proteobacteria– Contains most of the gram negative bacteria.– Relationships have been put together via
Ribosomal RNA studies.– Split up into five classes.– Alpha, beta, gamma, delta, and epsilon
Alphaproteobacteria
• The Alphaproteobacteria contain many bacteria that are capable of nitrogen fixation in symbiosis with plants.– What is nitrogen fixation?
• Also includes several plant and human pathogens.
The Alphaproteobacteria• Human pathogens
– Bartonella• B. hensela: Cat-scratch disease
– Brucella: Brucellosis• Can survive phagocytosis, an important element of the
body’s defense against bacteria.
The Alphaproteobacteria• Obligate intracellular parasites