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This page titled 8: Bacterial Colony Morphology is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Jackie Reynolds. 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 ...
- Colony Shape
- Size of The Bacterial Colony
- Appearance of The Colony Surface
- Consistency/Texture
- Color of The Colonies
- The Opacity of The Bacterial Colony
- Some Important Terminologies
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. These four forms represent the most common colony shapes you are likely to encounter. 1. circular, 2. irregular, 3. filamentous, and 4. rhizoid Elevation of the bacterial colony:It gives information about how...
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. Tiny colonies are also referred to as punctiform(pin-point). Colonies larger than about 5 mm are likely to be motile organisms. Pu...
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. Bacillus species give dry, wrinkled colonies. Pseudomonas stutzerialso gives similar-appearing wrinkled colonies.
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).
Some bacteria produce pigment when they grow in the medium, e.g., green pigment produces by Pseudomonas aeruginosa, buff-colored colonies of Mycobacterium tuberculosis in L.J medium, and red-colored colonies of Serratia marcescens.
The opacity of a bacterial colony can be described as transparent (clear), opaque (not transparent or clear), translucent (almost clear, but distorted vision–like looking through frosted glass), or iridescent (changing colors in reflected light). A pinpoint translucent β-hemolytic colonies on blood agar is most probably a Streptococcus species. Sta...
Draughtsman colonies Young colonies of Streptococcus pneumoniae (pneumococci)have raised centers, but as the culture ages, they become flattened, with a depressed central part and raised edges giving them a ringed appearance also known as ‘draughtsman colonies’. References 1. Forbes, S., Sahm, D. F., & Weissfeld, A. S. (2002). Bailey & Scott’s Diag...
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Jul 21, 2021 · Definition. noun, plural: colonies. ( biology) Several individual organism s (especially of the same species) living together in close association. ( cell culture) A cluster of identical cell s ( clone s) on the surface of (or within) a solid medium, usually derived from a single parent cell, as in bacterial colony. Supplement.
Nov 21, 2023 · Colony morphology is useful in identifying the type of bacteria. Bacterial colonies are classified based on their form, margin, and elevation. Based on their form, bacterial colonies are referred ...
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 ...
Dec 4, 2022 · The visual qualities of a bacterial colony on an agar plate are known as a colony. Morphological features of a colony . Frequently, the appearance of the bacterial colony on the culture media serves as the identifying trait for a particular bacterial species and bacterial morphology. The bacterial colony frequently exhibits the following ...
