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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...
People also ask
How do you describe a bacterial colony?
What is a single bacterial colony?
What is bacterial colony morphology?
Why is a bacterial colony important in microbiology?
In microbiology, a colony represents a visible mass of microbial cells. A single bacterial colony indicates a group of bacterial cells or a bacterial mass. This group of bacterial cells over a nutrient base is what we call a bacterial colony. In a colony, all the bacterial cells originate from a single mother cell and look identical to each other.
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 ...
Colony (biology) In biology, a colony is composed of two or more conspecific individuals living in close association with, or connected to, one another. This association is usually for mutual benefit such as stronger defense or the ability to attack bigger prey. [1] Colonies can form in various shapes and ways depending on the organism involved.
Colonial morphology. In microbiology, colonial morphology refers to the visual appearance of bacterial or fungal colonies on an agar plate. Examining colonial morphology is the first step in the identification of an unknown microbe. The systematic assessment of the colonies' appearance, focusing on aspects like size, shape, colour, opacity, and ...
