Delta and Epsilon Proteobacteria Important Genera Myxococcus Stigmatella

Delta and Epsilon Proteobacteria � Important Genera: Myxococcus, Stigmatella � Sliding movement, � Although they do not contain flagellum, they are capable of moving when they come into contact with a surface. � Myxobacteria form a budding body and exhibit a life cycle with intercellular communication.

Sulfate and Sulfur-Reducing Proteobacteria � Important Genera: Desulfovibrio, Desulfobacter, Desulfuromonas � They can use sulfate (SO 42 -) and sulfur (S 0) as electron acceptors under oxygen-free conditions.

Firmicutes, Mollicutes and Actinobacteria Non-Spore Forming Firmicutes Important Genera: Staphylococcus, Micrococcus, Streptococcus, Lactobacillus, Sarcina These Gram-positive cocci are relatively resistant to low water potential and has good tolerance to drying and high salt (Na. Cl) concentration.

� Staphylococcus epidermidis; it is a microorganism, usually found in the skin or mucous membranes. � Staphylococcus aureus; It is a yellow pigmented organism that arises in relation to pathological conditions.

Lactic Acid Bacteria and Lactic Acid Fermentation � Gram-positive bacilli and cocci able to produced lactic acid as a fermentation product. � aerotolerant anaerobes. � Limited biosynthetic capabilities

� The only fermentation product produced by the group called homofermentative is lactic acid. � The other group is called heterofementative. They produce ethanol and CO 2 as well as lactate.

Streptococcus and Other Cocci � Some species of the genus Streptococcus are pathogens � Other streptococci are lactic acid producers; plays an important role in the production of some fermented products � Some species are the root cause of tooth decay

� Colonies of strains producing streptolizin O or S are surrounded by a large zone of completely hemolized red blood cells. This phenomenon is called β-hemolysis. � Streptococcus and the like are divided into immunological (determined by different letters) groups of specific carbohydrate antigens.