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Bacteria shapes and sizes6/29/2023 ![]() Other surface descriptions might be: dull (opposite of glistening), veined, rough, wrinkled (or shriveled), or glistening. Mixed growth of mucoid Lactose fermentingĬolonies and NLF colonies in MacConkey Agarīacterial colonies are frequently shiny and smooth in appearance. ![]() Punctiform colonies are distinguished from circular colonies by their very small size. Colonies larger than about 5 mm are likely to be motile organisms. Tiny colonies are also referred to as punctiform (pin-point). Punctiform and other types of bacterial colony The diameter of a representative colony may be measured in millimeters or described in relative terms such as pinpoint, small, medium, and large. ![]() The size of the colony can be a useful characteristic for identification. Highly motile organisms swarmed over the culture media, such as Proteus spp. Examples areĬolonies that are irregular in shape and/or have irregular margins are likely to be motile organisms. The margin of the bacterial colony: The margin or edge of a colony may be a vital characteristic in identifying organisms.
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