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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.
If one stained a gram-positive cell only with safranin?
If a gram-positive cell is stained only with safranin, it would likely appear pink or red under a microscope. This is because safranin is a counterstain used in the Gram staining procedure to colorize gram-negative bacteria, whereas gram-positive bacteria retain the crystal violet primary stain and appear purple.
Is TB a gram negative bacteria?
No, TB (Mycobacterium tuberculosis) is a gram-positive bacteria.
Are Escherichia coli gram-negative?
Yes, E. coli are Gram negative.
What is the gram stain for leptospira icterorrhsgiae?
Leptospira as a genus has characteristics of both Gram negative and Gram positive bacteria, in that they have a double membrane with peptidoglycan attached to the inner membrane. Thus when stained they could appear either positive or negative, if one could even see them at all. This in addition to their extreme slenderness makes visualization by gram stain less than ideal. Typically one would observe this organism by darkfield microscopy rather than attempt a likely to fail Gram stain.
Is it Ecoli a fastidious organism?
It is not fastidious, it is a gram negative organisms. To be precise fastidious organisms are those which could be stained with any of the dyes eg mycobacterium tuberculosis
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.
If one stained a gram-positive cell only with safranin?
If a gram-positive cell is stained only with safranin, it would likely appear pink or red under a microscope. This is because safranin is a counterstain used in the Gram staining procedure to colorize gram-negative bacteria, whereas gram-positive bacteria retain the crystal violet primary stain and appear purple.
What is the difference in color between gram positive and gram negative bacteria?
Gram positive bacteria appear purple or blue when stained with the Gram stain, while gram negative bacteria appear pink or red. This color difference is due to the thickness of the cell wall and the presence of an outer membrane in gram negative bacteria.
How does a stained smear of S epi and E coli made from 7-day-old cultures would appear?
A 7-day-old culture may appear gram negative, when the organmisms are actually gram positive. Thus, S. epi would appear gram negative, and E. coli gram negative.
Is TB a gram negative bacteria?
No, TB (Mycobacterium tuberculosis) is a gram-positive bacteria.
What is gram stain of candida?
Candida is a fungi and cannot be gram stained. Only bacterias can be gram stained as either positive or negative.
When tested with a gram stain gram positive are stained what color?
Gram-positive bacteria will retain the crystal violet stain and appear purple under a microscope after being stained. This is due to the thick peptidoglycan layer in their cell walls that retains the stain during the washing step of the Gram staining procedure.
Are Escherichia coli gram-negative?
Yes, E. coli are Gram negative.
Is Staphylococcus saprophyticus gram positive or negative?
Yes. Staphylococci are classified as gram positive bacteria and appear as purple spheres when Gram stained.
What clinical specimens are gram stained?
The clinical specimens that are gram stained are microorganism, bodily fluids and sputum specimen. Gram staining makes it easier for the identification of organisms.
What are the gram reaction of mycobacterium?
Mycobacteria are typically Gram-positive, but their cell wall structure is unique and contains high lipid content, making them resistant to Gram staining. They are best visualized using acid-fast staining methods, such as the Ziehl-Neelsen or Kinyoun stains.
