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By looking closely at the colonial growth on the surface of a solid medium, characteristics such as surface texture, transparency, and the color or hue of the growth can be described. The following three characteristics are readily apparent whether you’re looking at a single bacterial colony or more dense growth, without the aid of any type of magnifying device.
i. Texture—describes how the surface of the colony appears. Common terms used to describe texture may include smooth, glistening, mucoid, slimy, dry, powdery, flaky etc.
ii. Transparency—colonies may be transparent (you can see through them), translucent (light passes through them), or opaque (solid-appearing).
iii. Color or Pigmentation—many bacteria produce intracellular pigments which cause their colonies to appear a distinct color, such as yellow, pink, purple or red. Many bacteria do not produce any pigment and appear white or gray.
Titany answered the question on September 13, 2021 at 07:08
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