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All cocci are gram (+) except Neisseria, Branhamella, Moraxella and Veilonella. All bacilli are gram (-) except Mycobacterium, Corynebacterium, Lactobacillus, Listeria, Clostridium, Bacillus, Erysipelothrix, and Nocardia. All spirals are gram (-)

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Who developed Gram staining?

Gram staining was devised by Hans Christian Gram of Denmark in the 1800s. (1853-1938)


Is gram staining related to flagella?

No, gram staining and flagella are not directly related. Gram staining is a technique used to classify bacteria based on cell wall characteristics, while flagella are thread-like appendages that help bacteria move. Flagella presence or absence does not affect the results of a gram stain.


Why is Gram staining classified as differential staining?

Differential staining is the procedure that are used to distinguish organism based on their staining properties. Use of gram stain divide bacteria into two classes - gram positive which retain crystal violet stain purple colour, gram negative which lose their crystal violet and give pink colour. By this method we can differentiate two different types of bacteria having different cell wall composition that is the reason gram staining used widely as differential staining


Why gram staining classified as differential staining?

Differential staining is the procedure that are used to distinguish organism based on their staining properties. Use of gram stain divide bacteria into two classes - gram positive which retain crystal violet stain purple colour, gram negative which lose their crystal violet and give pink colour. By this method we can differentiate two different types of bacteria having different cell wall composition that is the reason gram staining used widely as differential staining


What counter stain is used in gram staining?

safranin


Why is gram staining important?

It tells the microbiologist/clinician facts about the cell wall construction of the bacterium. This then indicates which antibiotics to prescribe if you are trying to get rid of a bacterial infection.


Is iodine a basic stain?

No, iodine is not a basic stain. Iodine is commonly used in Gram staining to identify bacteria as either Gram-positive or Gram-negative based on their cell wall composition. It acts as a mordant in the staining process and helps to fix the crystal violet stain in Gram staining.


What is gram variability?

Gram variability refers to a characteristic of certain bacteria that can exhibit variability in their response to Gram staining, appearing as a mix of both Gram-positive and Gram-negative characteristics. This variability can make the identification of these bacteria challenging because their staining characteristics may not be consistent.


Is gram staining special staining?

yes it is a special staining like other types....its importance is that one can identify the type of bacteria........


Are there endospores in pseudomonas aeruginosa gram staining?

Pseudomonas aeruginosa does not form endospores. In Gram staining, it typically stains gram-negative due to its thin peptidoglycan layer and outer lipid membrane.


Does giardia show up on gram stain?

no, it's eukaryotic. Gram staining is for bacteria.


What shape are gram negative bacteria?

Gram negative bacteria are typically rod-shaped (bacilli) or corkscrew-shaped (spirochetes). They have a double cell membrane composed of an inner and outer membrane, which contributes to their staining properties in the Gram staining technique.