Negate stain in DBK

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Aug 6th, 2022
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How to negate stain in DBK

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This video shows how to perform a negative stain and a negative stain is an acidic stain it has a negative charge and so Itamp;#39;s going to bind to the background and not the cells themselves on the slide So India ink is one. Thatamp;#39;s commonly used. Thatamp;#39;s what weamp;#39;re going to use here Nigro sin is another one Iamp;#39;m going to start with a slide a clean fresh slide And Iamp;#39;m going to put a drop of the stain the India ink on one end of the slide Okay And now Iamp;#39;m going to use my dowel, and Iamp;#39;m going to touch down to my culture And Iamp;#39;m just going to pick up one colony so tap remember about the size of a small freckle And Iamp;#39;m going to mix it Into the stain And Iamp;#39;m going to throw that dowel away into my biohazard and now Iamp;#39;m going to take a second slide, and Iamp;#39;m going to put it right in front of the drop and Using capillary action, Iamp;#39;m going to draw that stain across the slide Thatamp;#39;s ok

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Negative Staining Procedure If you are working from a plate culture, add a drop of sterile water to the slide and dilute your organism in the drop without spreading the drop. Put one or two drops of nigrosin on another slide. Use your sterilized loop to pick up a loop-full of nigrosin.
Negative staining employs the use of an acidic stain and, due to repulsion between the negative charges of the stain and the bacterial surface, the dye will not penetrate the cell. In negative staining, the results yield a clear cell with a dark background.
URANYL ACETATE A 1% to 3% solution of uranyl acetate dissolved in distilled water (pH 4.2 to 4.5) can be used to negatively stain many types of samples. The stain should be filtered through a 0.22 m filter that has been pre-rinsed with large volumes of double distilled water.
Negative Staining Take two slides. Place a drop of acidic dye, nigrosin, at one end of your slide. Place your specimen into the dye and swirl it in the stain. Using the other slide, hold it at a 45 angle and feather the mixture across the slide by pushing the dye. Air dry but do NOT heat fix. Observe your negative slide.
Negative staining protocols. The conventional negative staining protocol involves the adsorption of the specimen to a glow-discharged carbon-coated EM grid, which is washed with two drops of deionized water and subsequently stained with two drops of heavy metal solution.
Negative staining requires the use of acid stain such as the Indian ink or nigrosin. The acid stain with its negatively charged chromogen will not penetrate the cells because of the negative charge on the surface of the bacteria.
1. Place 3- 50 l drops of sterile water and 2- 50 l drops of 2% UA on parafilm 2. Apply 4 l of sample onto glow discharged grid for 40 sec 3. Gently blot the sample (Whatman #1 filter paper).

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