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Gram stain and shape of mycobacterium avium?
Mycobacterium avium is a rod-shaped bacterium that typically appears as pink/red on a Gram stain due to its acid-fast characteristics. It is a slow-growing, non-motile bacterium that is commonly found in the environment and can infect humans, particularly those with compromised immune systems.
The difference in cell wall structure of Mycobacterium and Nocardia compared to the typical gram positive bacterial cell wall structure is?
Mycobacterium and Nocardia have unique cell walls containing mycolic acids, which are hydrophobic and contribute to their acid-fast staining property. This gives them resistance to harsh conditions such as antibiotics and disinfectants and enables them to survive in the host. Gram-positive bacteria have a peptidoglycan layer that is significantly thicker compared to Mycobacterium and Nocardia, providing structural support and protection.
Is mycolic acid found in gram positive and gram negative cell wall composition?
Mycolic acid is primarily found in the cell walls of mycobacteria, which are a type of bacteria that include the causative agents of tuberculosis and leprosy. It is not typically found in the cell walls of other bacteria, including those classified as gram-positive or gram-negative.
What shape does mycobacterium smegmatis have?
Mycobacterium Smegmatis is a bacilli bacteria. It is rod shaped.
What are the differences between the Gram stain and acid-fast stain techniques in microbiology?
The Gram stain technique is used to differentiate bacteria into two groups based on their cell wall composition (Gram-positive and Gram-negative), while the acid-fast stain technique is used to detect bacteria that have a waxy cell wall, such as Mycobacterium species.
Is TB a gram negative bacteria?
No, TB (Mycobacterium tuberculosis) is a gram-positive bacteria.
Mycobacterium (Aerobic Chemoorganotrophs)?
Gram-positive bacterium, live on dead and decaying matter
Where does Mycobacterium tuberculosis hide?
Mycobacterium tuberculosis does not hide; it simply has a coating that makes it hard to detect. This waxy coating on its cell surface makes the cell impervious to gram staining.
Gram stain and shape of mycobacterium avium?
Mycobacterium avium is a rod-shaped bacterium that typically appears as pink/red on a Gram stain due to its acid-fast characteristics. It is a slow-growing, non-motile bacterium that is commonly found in the environment and can infect humans, particularly those with compromised immune systems.
What 2 genera of bacteria are gram variable?
Two genera of bacteria that are gram variable are Mycobacterium and Corynebacterium. Gram variable bacteria may appear to be both gram-positive and gram-negative due to differences in their cell walls.
What are some of the reason for a Gram variable reaction?
what are some of the reasons for a gram-variable reaction
Is tubercluosis a viral disease?
Tuberculosis etiology is cause by Mycobacterium a gram + rod, it is dormant during anerobic condition but deadly during aerobe.
What gram reaction do you expect from acid-fast bacteria?
Gram positive
What is fluorochrome staining technique for mycobacterium?
A flourochrome stain is an ultraviolet reactive dye that shines when exposed to UV. By using this stain, acid-fast bacilli (such as mycobacterium) can be easily seen. Flourochrome is used because standard techniques such as Gram stains can result in inconclusive results.
Is mycobacterium phlei gram positive or negative?
Although mycoplasma lack a cell wall and therefore test gram negative, they are considered to be descendents of 'nonsporulating and endospore forming gram-positive bacteria' (Madigan et al., 2009), such as Lactobacilli, Bacilli and Streptococci, (Dandekar et al., 2002), which have lost their cell wall. Mycoplasmas are therfore classed as gram- positive bacteria. This is supported by ribosomal RNA and DNA analysis.
What are examples of acid-fast organisms?
Examples of acid-fast organisms include Mycobacterium tuberculosis, Mycobacterium leprae, and Nocardia species. Acid-fast staining is a technique used to detect these bacteria, as they have a waxy substance in their cell walls that makes them resistant to standard staining methods.
What is the gram stain reaction of strep throat?
Streptococcus pyogenes is gram positive bacteria.
