CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of Mycoplasma pneumoniae. Mycoplasmas are the smallest cellular organisms known (diameter 0.3- 0.9 microns). Similar to bacteria in some respects (the relationship is unclear - some authorities regard them as primitive bacteria), they differ in that they lack a true cell wall & hence display a variety of forms. Some species are pathogens of humans and animals (cattle, sheep & goats) living on the moist mucosal membranes of the respiratory tract. Mycoplasma pneumoniae, for example, causes a pneumonia-like disease in humans. Magnification: x26,000 at 6x6cm size, x13,000 at 35mm size.
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