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Describe how Blue/White screening reagent helps in screening the colonies of transformed cells.
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- What does a white colony indicate during blue-white screening? Explain how the color is formed.What are the different categories of cell viability assays? Describe one of them briefly. Define the role (aim of use) of Trypan blue dye in cell culture studies.Briefly explain why this is ELISA referred to as colorometric assay.
- Rationalize the use of all the reagents used in Agarose gel electrophoresis.explain the Immunofluorescence Staining Protocol (briefly explain purpose of each step)?The total number of cells in a culture is counted using the trypan blue exclusion assay and is found to be 6.8 x 106 cells/ml. Each well in a 6 well plate requires 2 x 105 cells. How should the solution be diluted so that 1ml can be added to each well?
- what are the important principle in invertase test?Is there any way to stabilize color after adding stop solution in ELISA in Which HRP and TMB used as enzyme and chromophore?A phagehunter performs a spot titer using standard techniques (3 ul of each dilution spotted to lawn) of a lysate obtained from an optimum webbed plate experiment. The phagehunter counts 4 plaques on the 10-8 dilution spot. Which of the following scenarios is the best choice for the phagehunter to do next? a.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should try to make more optimum webbed plates. b.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should adopt a phage from direct isolation. c.) The phagehunter has achieved a high enough titer lysate to move forward with characterization experiments. d.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should go back to the pick-a-plaque experiment.
- Explain why a semi-log plot should be used for determining antigen concentration by ELISA.Fluorescence in-situ hybridisation (FISH) analysis can be performed on fixed pathological tumour sections. Briefly outline why interphase FISH is used on fixed material from a solid tumour, rather than metaphase FISHA phagehunter performs a spot titer using standard techniques (3 ul of each dilution spotted to lawn) of a lysate obtained from an optimum webbed plate experiment. The phagehunter counts 8 plaques on the 10-7 dilution spot. Which of the following scenarios is the best choice for the phagehunter to do next? a.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should go back to the pick-a-plaque experiment. b.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should adopt a phage from direct isolation. c.) The phagehunter has not achieved a high enough titer lysate to move forward with characterization experiments, so they should try to make more optimum webbed plates. d.) The phagehunter has achieved a high enough titer lysate to move forward with characterization experiments.