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Colonial morphology of various specimens of Pseudomonas aeruginosa, including mucoid types. 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 formation of patterns in the growth of bacterial colonies has extensively been studied experimentally. Resulting morphologies appear to depend on the growth conditions. They include well known morphologies such as dense branched morphology (DBM) or diffusion-limited aggregation (DLA), but much complex patterns and temporal behaviour can be fou
Bacillus licheniformis is a bacterium commonly found in the soil. It is found on bird feathers, especially chest and back plumage, and most often in ground-dwelling birds (like sparrows) and aquatic species (like ducks).
Spiral bacteria are another major bacterial cell morphology. [2] [30] [31] [32] Spiral bacteria can be sub-classified as spirilla, spirochetes, or vibrios based on the number of twists per cell, cell thickness, cell flexibility, and motility. [33] Bacteria are known to evolve specific traits to survive in their ideal environment. [34]
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L. pneumophila colony morphology is gray-white with a textured, cut-glass appearance; it also requires cysteine and iron to thrive. [11] It grows on buffered charcoal yeast extract agar as well as in moist environments, such as tap water, in "opal-like" colonies. [11] L. pneumophila is a intracellular bacterium.
C. striatum colonies are able to be plated in vitro; when growing on Blood Agar the colonies will appear as small (1-2mm diameter) with a white, moist, and smooth appearance. [1] [18] It is otherwise called a diphtheroid or coryneform due to its close phylogenetic relationship with diphtheria causing bacterium Corynebacterium diphtheriae. [4]