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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 colony surface is smooth and has a pasty texture. [ 1 ] [ 10 ] There is considerable cell and colony morphology when S. salmonicolor is grown in culture. [ 6 ] The budding yeast-like cells produced during the asexual stage are ellipsoidal to subcylindrical and 8–25 × 2–5.5 μm .
On CZ or MEA, colonies can spread broadly, reaching 20–30 mm in a week at 25 °C with light or moderate sporulation. [5] [4] The texture of the colony when grown on CZ is velutinous to floccose, which means that conidiophores can either arise like short velvet with little aerial mycelium or from a mass of tangled aerial hyphae. [3]
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
The colony morphology itself also displays several varieties. The main two types are large, smooth, with a flat edge and elevated center and small, rough, and convex. [83] A third type, mucoid, can also be found. The large colony can typically be found in clinal settings while the small is found in nature. [83]
Colonies tend to be cream-colored, but will turn red in the presence of iron in media, most likely as a result of pulcherrimin. [ 6 ] [ 9 ] B. licheniformis is found in a wide variety of environments, but especially in soil and in the feathers of birds, where B. licheniformis degrades β-keratin .
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.
Macroscopically, young A. candidus colonies may have a cottony texture in the outer surface which eventually becomes granular as the fungus matures and produces conidia. [15] A. candidus has been cultivated on both Czapek yeast extract agar (CYA) plates and Malt Extract Agar Oxoid (MEAOX) plates. The growth morphology of the colonies can be ...