What is the morphology of Neisseria?
Structure. Neisseria species are Gram-negative cocci, 0.6 to 1.0 μm in diameter. The organisms are usually seen in pairs with the adjacent sides flattened. Pili, hairlike filamentous appendages extend several micrometers from the cell surface and have a role in adherence.
What is the appearance of Neisseria gonorrhoeae?
N. gonorrhoeae colonies are pinkish-brown. The clear, golden-brown pigmentation apparent after incubation for 48 h. cultures results from autolysis of the cells.
What is the cell morphology of E. coli?
Type and morphology E. coli is a Gram-negative, facultative anaerobe, nonsporulating coliform bacterium. Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm3.
Is Neisseria oxidase positive or negative?
Neisseria mucosa Most strains are non-pigmented or greyish to buff yellow colonies. They also utilize glucose, maltose, fructose and sucrose to produce acid and not lactose and mannose. They are oxidase positive.
Can Neisseria gonorrhoeae grow on MacConkey Agar?
Note: Neisseria does not grow on MacConkey. Note: Growth, but no fermentation of lactose.
What are the basic microbiological characteristics of Neisseria meningitidis?
CHARACTERISTICS: Neisseria meningitidis belongs to the family Neisseriaceae 2. It is a Gram-negative, non-spore forming, non-motile, encapsulated, and non acid-fast diplococci, which appears in kidney bean shape under the microscope 1 3.
Does Neisseria grow on blood agar?
Neisseria spp. are fastidious. Blood agar and chocolate medium (blood heated at 176–194°F/80–90°C) are suitable growth media. Bacterial colonies usually appear after 24–48 hours of growth.
What is the colonial morphology of Neisseria gonorrhoeae?
Colonial morphology of Neisseria gonorrhoeae: In a humid aerobic environment enriched with 5-10% CO 2, colonies are thin, round, translucent, convex or slightly umbonate, with finely granular surface and lobate margins after incubation for 24 hours. The colonies of Neisseria gonorrhoeae are pinkish brown. They are easily emulsifiable and soft.
What kind of acid does Neisseria mucosa produce?
Three Neisseria species, N. mucosa, N. sicca, and N. subflava biovar perflava, produce acid from glucose, maltose, fructose, and sucrose. N. mucosa may be identified by it’s ability to reduce nitrate.
How are the cells of Neisseria meningitidis arranged?
Arrangement Of Cells – Neisseria meningitidis is arranged in pairs (diplococci), with the adjacent side flattened and they are usually present intracellularly when direct microscopic examination of the specimen from the lesions is carried out. Motility – Neisseria meningitidis is a Non-motile bacterium.
What kind of medium is used for Neisseria gonorrhoeae?
⇒ The Thayer Martin medium which is a Selective medium for Neisseria gonorrhoeae can be prepared by incorporating Antibiotics and Nutrients in Thayer Martin Agar base or in GC Agar base medium for the growth of Neisseria gonorrhoeae (Gonococcus).