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 (S0) 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 (NaCl) 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
2as 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.
