1. Bacteria Phyla

2. Proteobacteria - Largest and most diverse phylum -Contain genus Rhizobium – convert nitrogen into ammonia -Contain genus Nitrosomnas –convert ammonia to nitrite which allows other bacteria to convert to nitrate -Contains genus Agrobacterium causes tumors in plants -Rickettsiae causes Rocky Mtn. Fever -Helicobacter pylori causes stomach ulcers -Species are enteric such as E. coli make vitamin K and help enzymes break down food -Contains genus Salmonella which invades intestinal cells or creates toxins

3. Gram-Positive Bacteria -Most gram+ but some are gram – -Contains streptoccal species causes strepthroat -Contains Clostridium botulinum -Contains Lactobacilli – creates lactic acid turns milk soar and used to make yogurt -Contains Bacillus anthrax – biological weapon -Contains Actinomycetes used to make antibiotics such as tetracycline & Streptomycin -Contains genus Mycobacteria causes tuberculosis and leprosy

4. Cyanobacteria -Contain genus Anabaena which form specialized cells called heterocysts that convert nitrogen into ammonia -Responsible for Oxygen rich atmosphere

5. Spirochetes -Gram negative bacteria -Some aerobic or anaerobic -Contains Treponema pallidum causes Syphilis -Contains Borrelia burgdorferi causes Lyme disease

6. Chlamydia -Gram Negative -Coccoidal -Live only inside animal cells -Cell walls lack peptidoglycan -Chlamydia trachomatis causes nongonococcal urethritis or chlamydia