Imagine that you are Gram staining a mixed culture of both gram-positive and gram-negative bacteria. If you omitted the iodine (mordant) step in the procedure, what colors would the bacteria on your slide appear to be?
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- What color would gram positive cells appear if ghr safranin staining step was left out of staining procedure ? Why?Why is it important to perform a gram stain for any type of bacteria? After performing the gram stain method what would be the next step? (Think in terms of the real-world situation) Explain.The bacterial cells in the image below were stained with a high concentration of carbolfuschin for an extended period of time (5 minutes) while the slide was heated. The slide was decolorized with a mixture of acid and alcohol. The slide was then counter-stained with methylene blue. What kind of stain does this describe?
- Why is nigrosin-water- bacteria puddle need to be mixed in a Simple/Negative stainingThe unknown observations are shown as a mixed stain, gram positive, and gram negative. The next images shows the chart of what we can choose from for the gram positive bacterial stain. We are allowed to choose 4 test or stains that we would like to use to preform to identify the unknown.After performing the gram stain you observe your result as gram negative. To help confirm this result what type of method (besides the gram stain) could you perform? Please explainwhy, the result you would want to observe and the interpretation of the result.
- In Gram staining method, list the reagents and state their role for each step of the procedure? In preparing bacterial smear, why do we need to pass the slide over the flame?When performing a Gram stain on a Gram-negative bacteria, why does the bacteria stain pink? Crystal violet stain binds to iodine and remains in the bacterial cell wall because of the thick peptidoglycan layer. Safranin counterstain gets in the bacteria’s cell wall to stain the cell pink. The alcohol wash removes crystal violet and iodine from the bacteria. Crystal violet stain binds to iodine and remains in the bacteria cell wall because of the thick peptidoglycan layer AND Safranin counterstain gets in the bacteria’s cell wall to stain the cell pink. Safranin counterstain gets in the bacteria’s cell wall to stain the cell pink AND The alcohol wash removes crystal violet and iodine from the bacteria.After conducting the Gram staining procedures and you observe nothing (you didn’t see anything) in your slide under the microscope, what could be the mistake you have done? What can you observe when you view a Gram stained-mixture of bacterial specimen?
- Which of the following is/are true regarding the acid-fast stain? (There may be more than one correct answer.) Non-acid-fast microbes appear blue in a completed acid-fast stain. O Acid-fast cells retain the primary dye after treatment with acid-alcohol. O It is used to identify members of the genus Mycobacterium. V Acid-fast cells appear bright pink/red in a completed acid-fast stain. O If cells are acid-fast, they are gram-negative.Both crystal violet and safranin are basic stains and may be used to do simple stains on Gram positive and negative cells. This being the case, explain how they end up staining Gram positive and gram negative cells differently.Is is best to observe slides of bacteria stained with the acid fast stain under high dry magnification. True or false