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Jun 7, 2016 · The "bump" on an umbonate colony is called an umbo. 4. Margin. Erose is synonymous with serrated. 5. Surface. Surface can be smooth, glistening, rough, wrinkled, dry, powdery, moist, mucoid (forming large moist sticky colonies, brittle, viscous (difficult to remove from loop), butyrous (buttery). 6.
Jul 13, 2023 · Escherichia coli (E. coli) is a gram-negative bacillus known to be a part of normal intestinal flora but can also be the cause of intestinal and extraintestinal illness in humans. There are hundreds of identified E. coli strains, resulting in a spectrum of disease from mild, self-limited gastroenteritis to renal failure and septic shock. Its virulence lends to E. coli’s ability to evade host ...
Colony Morphology. Characteristics of a colony such as shape, edge, elevation, color and texture. When recording colony morphology, it is important to also record color, optical properties (translucence, sheen) and texture (moist, mucoid or dry). However, remember that color is often influenced by environment.
Dec 31, 2023 · Colony Morphology: Pigmentation. Pigments can be divided into two basic types: water insoluble and water soluble. If the pigment is water insoluble, as in the case of most chromogenic bacteria, it does not diffuse out of the organism. As a result, the colonies are pigmented but the agar remains the normal color.
Mixed culture streak plate. Note the different colony characteristics. Escherichia coli (E. coli) is a normal inhabitant of the colon of warm-blooded animals and is a Gram negative bacilli. Although E. coli is normally non-pathogenic, some strains cause urinary tract infections, food poisoning, and diarrheal infections.
Dec 31, 2022 · Abstract. Escherichia coli have served as important model organisms for over a century—used to elucidate key aspects of genetics, evolution, molecular biology, and pathogenesis. However, defining which strains actually belong to this species is erratic and unstable due to shifts in the characters and criteria used to distinguish bacterial ...
Mar 7, 2017 · Bacterial cell shapes represent billions of years of evolutionary refinement. Their small size results in high surface area-to-volume ratios, which are ideal for nutrient transport, efficient respiration, and maintenance of structural integrity. Overall cell shape is known to be governed by a wealth of cellular processes and environmental cues ...
