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What structure is stained in a counterstain?
Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. If the violet can be washed out and the counter stain (pink) is added, the bacteria are Gram-.
Why does some bacteria stain purple and some red?
The purple stained bacteria are called gram positive bacteria and retain the stain after washing by having a thick cell wall one one layer of a heavily crossed linked material called peptidoglycan. ( Google that ) The red stained bacteria are gram negative because they posses two thinner layers of peptidogylcan cell wall that that do not hold the gram stain and it is mostly washed away in rinsing the bacterial samples.
What is the stain most useful in clinicians to decide for bacterial infection?
Methylene blue a basic stain is generally used to identify the external morphology of bacteria.The other stain which is used as differential stain and which can also differentiate the baceteia on the basis of their cell wall is gram stain i.e. Crystal voilet and is counter stained with Saffranine
Could a negatively charged dye stain a bacteria?
The effect on the bacteria depends if the stain is an acidic or basic stain. Most bacteria are stained when a basic stain permeates the cell wall and adheres by weak ionic bonds to the bacterial cell, which is slightly negatively charged.
Can a Gram stain a prion?
Protists are often stained using a silver stain, not a Gram stain.
Which stain would be the best choice for detecting mycobacterium the bacteria responsible for tuberculosis and leprosy?
ZN stain
What is the appearance of capsule after being stain with capsule stain procedure?
Capsules appear as a clear halo surrounding stained bacteria when using the capsule stain procedure. The capsule itself does not stain, allowing it to show up as a clear area against the stained background of the bacteria.
What is the difference between ZN stain and modified ZN stain?
in Zn we use 3% decolorizer, while in modified 1% h2so4 is used, modified is used for paracite like Cryptosporidium, cyclosporidium and bacterias like nocaddia and actinomyces. also in modified heating isn't done.
What structure is stained in a counterstain?
Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. If the violet can be washed out and the counter stain (pink) is added, the bacteria are Gram-.
Why does some bacteria stain purple and some red?
The purple stained bacteria are called gram positive bacteria and retain the stain after washing by having a thick cell wall one one layer of a heavily crossed linked material called peptidoglycan. ( Google that ) The red stained bacteria are gram negative because they posses two thinner layers of peptidogylcan cell wall that that do not hold the gram stain and it is mostly washed away in rinsing the bacterial samples.
Describe the microscopic appearance of encapsulated streptococcus if stained with safranin?
Safranin (red) is used in gram staining and endospore staining as the secondary stain. Nigrosin is used in negative staining, staining only the background and not the bacteria. Therefore, the bacteria within the capsule would stain red from the safranin. (Like in endospore staining and negative gram staining, safranin would stain the bacteria red.) Nigrosin would stain the background of the organism just as it would in negative staining. Bacteria (within capsul): stained safranin red Capsule (outer layer of bacteria): clear Background of organism: stained dark with Nigrosin
What is there in the structure of bacteria that cause some to stain purple and other to stain red?
The purple stained bacteria are called gram positive bacteria and retain the stain after washing by having a thick cell wall one one layer of a heavily crossed linked material called peptidoglycan. ( Google that ) The red stained bacteria are gram negative because they posses two thinner layers of peptidogylcan cell wall that that do not hold the gram stain and it is mostly washed away in rinsing the bacterial samples.
What role does the secondary stain play in the process of gram staining?
The secondary stain in the process of gram staining helps to colorize bacteria that were not initially stained by the primary stain. This allows for differentiation between gram-positive and gram-negative bacteria based on their cell wall composition.
What is the stain most useful in clinicians to decide for bacterial infection?
Methylene blue a basic stain is generally used to identify the external morphology of bacteria.The other stain which is used as differential stain and which can also differentiate the baceteia on the basis of their cell wall is gram stain i.e. Crystal voilet and is counter stained with Saffranine
What is an azurophil?
An azurophile is a cell which has been readily stained with an azure stain.
What cell parts take the stain in?
In Gram staining, the cell wall of bacteria takes the stain differently based on their structure. Gram-positive bacteria retain the crystal violet stain, appearing purple, because they have a thick layer of peptidoglycan in their cell wall. Gram-negative bacteria do not retain the stain well and appear red after the counterstain with safranin, as they have a thinner layer of peptidoglycan and an outer membrane.
Could a negatively charged dye stain a bacteria?
The effect on the bacteria depends if the stain is an acidic or basic stain. Most bacteria are stained when a basic stain permeates the cell wall and adheres by weak ionic bonds to the bacterial cell, which is slightly negatively charged.
