![]() ![]() Image 3: Undulate form colonies- Streak plate isolation of Mycobacterium smegmatis on trypticase soy agar (TSA) incubated for 96 hours at 37oC. Image by Bryan MacDonald, Christopher Adams, and Kyle Smith, Brigham Young University, Provo, UT. Image 2: Example of circular formed colonies- Serratia marcescens colonies cultivated on trypticase soy agar. Margin: the shape of the edge or margin of the colonyįigure 1: Different colony morphologies/characteristics Elevation: the degree to which colony growth is raised flat, raised,į. ![]() Form: the shape of the colony circular, irregular, filamentous, or rhizoidĮ. With a needle smooth (buttery), dry (granular), or mucoid (slimy) and theĪppearance as judged by the manner in which the colony refracts light Ĭlear, glistening, dense, opaque, or translucent.ĭ. Texture: the texture of the colony as determined by touching the colony Color: absolutely white, various degrees of pigmentationĬ. Size: pinpoint, small, medium, or large range: < l mm - 3cmī. Six parameters are normally used to describe microbial colonies growing on an agar surface:Ī. ![]() Image by Rebecca Buxton, University of Utah, Salt Lake City, UT.Ĭolony morphology can be an aid in the identification of microorganisms.Īlthough colony morphology cannot be employed as the sole identifying criterion, it is a useful trait in the classification of many common types of microorganisms. Image 1: Notice individually isolated colonies: Large, creamy white, circular, beta-hemolytic colonies typical o f Staphylococcus aureus cultured on Blood agar. Colonies that are visible to the human naked eye contains tens of thousands or even millions of individual bacteria!! Observing colony characteristics is one piece of information that microbiologists can use to identify unknown bacteria. Colonies can have different forms, margins, elevations, and colors. Although individual cells are too small to be viewed, masses of cells can be observed. Each colony arises from a single bacterium or a few bacteria. On agar plates, bacteria grow in collections of cells called colonies. \)Įven on general purpose growth media, bacteria can exhibit characteristic growth patterns. ![]()
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