What are the characteristics of mycobacteria?
Mycobacteria are immobile, slow-growing rod-shaped, gram-positive bacteria with high genomic G+C content (61-71%). Due to their special staining characteristics under the microscope, which is mediated by mycolic acid in the cell wall, they are called acid-fast. This is also the reason for the hardiness of mycobacteria.
What are the characteristics of Mycobacterium that differs from other microorganisms?
The distinguishing characteristic of all Mycobacterium species is that the cell wall is thicker than in many other bacteria, being hydrophobic, waxy, and rich in mycolic acids/mycolates.
How does Mycobacterium tuberculosis differ from other bacterial cells?
Tuberculosis is caused by Mycobacterium Tuberculosis H37Rv (MTB) which is a unique acid fast gram positive bacterium. It is unique because of its high lipid and mycolic acid content of its cell wall. It neither contains phospholipid outer membrane nor retains dye.
Is Mycobacterium Phlei positive or negative?
Bacteria Collection: Mycobacterium phlei Additional Information
| Susceptibility Testing Text: | Isomiazid 1% : + |
|---|---|
| GramReaction Text: | positive |
| Acid Fast Staining Text: | positive |
| Motility At 25°C Text: | negative |
| Staining: | < easy & even |
Which of the following is a distinguishing characteristic of bacteria in the genus Mycobacterium?
The distinguishing characteristic of all Mycobacterium species is that the cell wall is thicker than in many other bacteria, which is hydrophobic, waxy, and rich in mycolic acids/mycolates.
What is a characteristic of Mycobacterium tuberculosis The bacterium causing tuberculosis?
Mycobacteria, such as M tuberculosis, are aerobic, non–spore-forming, nonmotile, facultative, curved intracellular rods measuring 0.2-0.5 μm by 2-4 μm.
Is Mycobacterium Phlei aerobic or anaerobic?
phlei, M . gordonae and M. kansasi in aerobic conditions only. Anaerobic cultures of both slowly and rapidly growing mycobacteria were sensitive to malachite green.
What shape is Phlei?
rod-shaped
M. phlei is a rod-shaped bacterium 1.0 to 2.0 micrometers in length. If grown on an agar plate, M. phlei colonies appear orange to yellow in color, and predominantly dense with smooth edges, although some smaller filamentous colonies have also been described.
Which of the following are characteristic of the genus Bacillus?
Members of the genus Bacillus are large, aerobic, gram-positive, and sporeforming rods. They are catalase positive; many are fermentative and most are motile. Bacillus species occur widely in nature, being found in the air, water, and soil.
Which of the following is considered a distinguishing characteristic of prokaryotic cells?
Prokaryotes lack an organized nucleus and other membrane-bound organelles. Prokaryotic DNA is found in a central part of the cell called the nucleoid. The cell wall of a prokaryote acts as an extra layer of protection, helps maintain cell shape, and prevents dehydration.
What does Mycobacterium phlei colonies look like?
If grown on an agar plate, M. phlei colonies appear orange to yellow in color, and predominantly dense with smooth edges, although some smaller filamentous colonies have also been described. Like other mycobacteria, M. phlei retains the acid-fast stain. M. phlei can grow at temperatures ranging from 28 °C to 52 °C.
What is the morphology of mycobacteria?
Mycobacteria are Gram-positive, catalase positive, non-motile, non-spore forming rod-shaped bacteria (0.2–0.6 μm wide and 1.0–10 μm long). The colony morphology of mycobacteria varies with some species growing as rough or smooth colonies. Colony colour ranges from white to orange or pink ( Iivanainen, 1999 ).
Is Mycobacterium phlei harmful to humans?
M. phlei has only occasionally been isolated in human infections, and patients infected with M. phlei generally respond well to anti-mycobacterial therapy. Mycobacterium phlei is a species of acid-fast bacteria in the genus Mycobacterium.
What is the GC content of Mycoplasma phlei?
M. phlei has an unusually high GC-content of 73%. M. phlei is a rod-shaped bacterium 1.0 to 2.0 micrometers in length. If grown on an agar plate, M. phlei colonies appear orange to yellow in color, and predominantly dense with smooth edges, although some smaller filamentous colonies have also been described.