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Mycoplasma
''Mycoplasma'' is a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis. They can be parasitic or saprotrophic. Several species are pathogenic in humans, including ''M. pneumoniae'', which is an important cause of atypical pneumonia and other respiratory disorders, and ''M. genitalium'', which is believed to be involved in pelvic inflammatory diseases. ''Mycoplasma'' species are the smallest bacterial cells yet discovered, can survive without oxygen, and are typically about 0.1 micrometre in diameter. Hundreds of mycoplasmae infect animals.
== Origin of the name ==
The term ''mycoplasma'', from the Greek μυκής, ''mykes'' (fungus) and πλάσμα, ''plasma'' (formed), was first used by Albert Bernhard Frank in 1889 to describe an altered state of plant cell cytoplasm resulting from infiltration by fungus-like microorganisms. Julian Nowak later proposed the genus name ''Mycoplasma'' for certain filamentous microorganisms imagined to have both cellular and acellular stages in their lifecycles, which could explain how they were visible with a microscope, but passed through filters impermeable to bacteria.
Later, the name for ''Mycoplasma'' was pleuropneumonia-like organisms (PPLO), broadly referring to organisms similar in colonial morphology and filterability to the causative agent of contagious bovine pleuropneumonia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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