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- Bacteria grow on solid media as colonies. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike. In the identification of bacteria and fungi much weight is placed on how the organism grows in or on media.
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Why is a bacterial colony important in microbiology?
What is a bacterial colony?
What is bacterial colony morphology?
Why is colony morphology important?
Although one might not necessarily see the importance of colonial morphology at first, it really can be important when identifying the bacterium. Features of the colonies may help to pinpoint the identity of the bacterium. Different species of bacteria can produce very different colonies.
- Colony shape. It includes the form, elevation, and margin of the bacterial colony. Form of the bacterial colony: The form refers to the shape of the colony.
- Size of the bacterial colony. The size of the colony can be a useful characteristic for identification. The diameter of a representative colony may be measured in millimeters or described in relative terms such as pinpoint, small, medium, and large.
- Appearance of the colony surface. Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: dull (opposite of glistening), veined, rough, wrinkled (or shriveled), or glistening.
- Consistency/Texture. Several terms that may be appropriate for describing the texture or consistency of bacterial growth are: dry, moist, viscid (sticks to loop, hard to get off), brittle/friable (dry, breaks apart), mucoid (sticky, mucus-like).
Mar 14, 2024 · On agar plates, bacteria grow in collections of cells called colonies. Each colony arises from a single bacterium or a few bacteria (CFU). Although individual cells are too small to be viewed with the unaided eye, masses of cells can be observed. Colonies can have different forms, margins, elevations and colors.
Nov 19, 2011 · Classical microbiology uses both gross and microscopic morphology to identify microbes. Gross morphology includes colony shape, size, and surface features (Fig. 2.1). For example, Bacillus atropheus strain globigii produces an orange-pigmented colony on tryptic soy agar but produces small white colonies on other media. The structures assigned ...
- Joany Jackman
- 2012
- 10.1007/978-1-60327-219-3_2
Nov 21, 2023 · Author Haripriya Munipalli View bio. Instructor Angela Hartsock View bio. What is a bacterial colony? Learn about colony morphology and colony characteristics of bacteria. See the...
Why is the health-care provider concerned about Jeni’s signs and symptoms? Jump to the next Clinical Focus box. The bacterial cell cycle involves the formation of new cells through the replication of DNA and partitioning of cellular components into two daughter cells.
