Search results
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 ...
- Bacterial Size
- Bacterial Shape
- Arrangements of Cocci
- Arrangement of Bacilli
- Arrangement of Spiral
- Other Shapes and Arrangements
- References
- Sources
The unit of measurement used in bacteriology is the micron (micrometer) which is one-thousandth of a millimeter.Bacteria are, in general one-tenth the size of the eukaryotic cell. On average, the size of bacteria ranges from 0.5 to 5 µm.However, they can be as tiny as 0.3 µm and as large as 0.7mm.The limit of resolution with the unaided eye is about 200 microns, and as many bacteria are smaller than this size, they are not visible with naked eyes.Image created using biorender.com 1. Most of the bacteria have a rigid cell wall that provides a definite shape to the bacteria while protecting the internal components. 2. Even though this characteristic is valid for the majority of bacteria, they vary in shape that allows them to be classified into different groups based on their forms. 3. This w...
Cocci bacteria can be arranged either singly, in pairs, in groups of four, in chains, in clusters or cubes consisting of eight cells.These cells remain attached during cell division.Bacillus
1. Bacilli are the bacteria which are rod-shaped and are present as single cells. 2. These bacteria can form endospores and are facultative anaerobes. 3. Examples: Salmonella enterica subsp, Bacillus cereus, and Salmonella choleraesuis.
Diplobacilli
1. As in Diplococci, Diplobacilli also exists in pairs. 2. After cell division, the two cells do not divide and grow in an attached arrangement. 3. Examples: Coxiella burnetii, Klebsiella rhinoscleromatis, Moraxella bovis.
Streptobacilli
1. In this group, bacteria are arranged in chains. 2. This results from cell division in a single chain. 3. Examples: Streptobacillus moniliformis, Streptobacillus Levaditi, Streptobacillus felis, Streptobacillus hongkongensis.
Vibrio
1. These are the slightly curved bacteria resembling a comma shape. 2. Examples: Vibrio mytili, Vibrio anguillarum, Vibrio parahaemolyticus, Vibrio cholera.
Spirochetes
1. Spirochetes are spiral bacteria having a helical shape. 2. These are flexible and have an axial filament which helps in motility. These filaments are essential distinguishing character between spirochetes and other bacteria. 3. These filaments run throughout the length of the bacteria and thus, help in twisting the motion of the bacteria. 4. Examples: Leptospiraspecies (Leptospira interrogans), Treponema pallidum, Borrelia recurrentis.
Spirilla
1. These bacteria are similar in structure with spirochetes but are more rigid. 2. They, too, have a flagellum but lack the endoflagella like in spirochetes. 3. Examples: Campylobacter jejuni, Helicobacter pylori, Spirillum winogradskyi.
Appendaged Bacteria 1. The bacteria that produce a unique structure like pillus or fimbriae are called appendaged bacteria. 2. These bacteria are more virulent than other bacteria that do not form these appendages. 3. Example: Neisseria gonorrheae, the agent of Gonorrhea. Box-shaped/ Rectangular Bacteria 1. Box-shaped bacteria are rectangular in sh...
Young K. D. (2007). Bacterial morphology: why have different shapes?. Current opinion in microbiology, 10(6), 596–600. https://doi.org/10.1016/j.mib.2007.09.009Al-mohanna, Moshtaq & H., quine. (2016). MORPHOLOGY AND CLASSIFICATION OF BACTERIA.Constantino MA et al.(2016). Helical and rod-shaped bacteria swim in helical trajectories with little additional propulsion from helical shape. Science Advances. DOI: 10.1126/sciadv.16016613% – https://www.microscopemaster.com/bacteria-size-shape-arrangement.html3% – http://europepmc.org/articles/PMC21695032% – https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2169503/2% – https://microbiologyinfo.com/different-size-shape-and-arrangement-of-bacterial-cells/Mar 27, 2024 · Bacteria – A colony made up of bacteria typically appear in colors white cream, yellow, and white. In terms of design, the bacteria colony tends to be quite circular. Bacterial Colony Morphology Characteristics. Yeasts – The colonies of yeast, an fungus type It is a bit like the colonies of bacteria.
Mar 28, 2024 · Generally, bacteria manifest sizes that are approximately a tenth of eukaryotic cells. These cells predominantly lie within the range of 0.5 to 5 µm. Nonetheless, this scale has observed extensions, with the tiniest bacterial species approximating 0.3 µm and the most substantial reaching dimensions as expansive as 0.7 mm.
Aug 5, 2024 · Convex colonies take the raised elevation a step further, forming a more rounded, bulging shape. This elevation type is common in many bacterial species, including Enterococcus faecalis. The convex shape can indicate a robust and healthy colony, often resulting from optimal growth conditions. The smooth, dome-like appearance of convex colonies ...
Jan 6, 2024 · Bacteria grow on solid media as colonies. A colony is defined as a visible mass of microorganisms originating from a single mother cell. Key features of these bacterial colonies serve as important criteria for their identification. Characteristics of bacterial colonies. Colony morphology can sometimes be useful in bacterial identification.
People also ask
What is bacterial colony morphology?
What is bacterial morphology?
What is a colony morphology?
What does a bacteria colony look like?
Why is morphology important in microbiology?
What determines the morphology of a bacterial cell?
Oct 22, 2024 · Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: veined, rough, dull, wrinkled (or shriveled), glistening. 1c. Color – It is important to describe the color or pigment of the colony. Also include descriptive terms for any other relevant optical characteristics such as: opaque, cloudy ...
