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Images Dated 30th October 2002

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TEM of Streptococcus pneumoniae bacteria Featured 30 Oct 2002 Image

TEM of Streptococcus pneumoniae bacteria

False-colour transmission electron micrograph (TEM) of Streptococcus pneumoniae (pneumono- coccus), a spherical, Gram-positive bacterium associated with pneumonia in humans. The bacteria secrete a viscous material to form a capsule around their cell wall. The role of the capsule is uncertain, but is associated with virulence in pathogenic organisms, conveying protection against the immune system of the host. Capsulated organisms resist phagocytosis (engulfing) by white blood cells and may survive digestion by scavengers cells, continuing to multiply normally. Magnification: x30, 000 at 6x7cm size