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Q: Draw a dilution scheme for a dilution of phage from 1.5 x 1010 PFU/mL to 1.00 x 102 PFU/mL. Achieve…
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Prepare a dilution of phage from 1.5 x 1010 PFU/mL to 1.00 x 102 PFU/mL.
Draw a dilution scheme to achieve this serial dilution considering the following:
- The volumes of each dilution should be 1.0mL.
- It is not advisable to perform any dilutions > 1/100.
- The first dilution in any titre determination of stock phage should use 10µl or less of stock.
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- Draw a dilution scheme for a dilution of phage from 1.5 x 1010 PFU/mL to 1.00 x 102 PFU/mL. Achieve this serial dilution considering the following: The volumes of each dilution should be 1.0mL. It is not advisable to perform any dilutions > 1/100. The first dilution in any titre determination of stock phage should use 10µl or less of stock.A plaque assay is performed beginning with 1 mL of a solution containing bacteriophages. This solution is serially diluted 4 times by combining 0.1 mL of each sequential dilution with 9.9 mL of liquid medium. Then 0.1 mL of the final dilution is plated in the plaque assay and yields 21 plaques. What is the initial density of bacteriophages in the original 1 mL? Recall that initial phage density = (plaque number/mL) ×× (dilution factor).Assume that you counted 67 plaques on a bacterial plate where 0.1ml of a 10-5 dilution of phage was added to bacterial culture. What is the initial concentration of the undiluted phage? Show your calculations and give your answer in pfu/ml (pfu = plaque-forming units)
- With an A260 value of 1.12 and a DNA concentration of 56.0 ng/mL, what is the pathlength of the optical system used within the Nanodrop?You are tasked with cultivating the following microorganisms:A recombinant strain of E. coliA wild strain of Streptomyces clavuligerus• Suggest a storage method for each microorganism and justify your choice. You have at your disposal a refrigerator and an ultrafreezer, in addition to materials and conditions for handling microorganisms.• Propose a culture medium for each (choose a complex medium for one organism and a synthetic medium for the other)As a complement of nutrients, they must be indicated on the following scale: +++ : above 5 g/L++ : from 1 to 5 g/L+ : below 1 g/L• Describe the procedure for preparing and sterilizing the components of the culture media for a volume of 5.0 L• Make a bench process selection scheme, up to the step of selecting a benchtop reactor 5 L.For the study of alanine production by a recombinant strain of E. coli, cultivation was carried out in a benchtop bioreactor with 4.5 L of culture medium, using glucose as a limiting substrate. During the cultivation, there was no lag phase and the cells showed exponential growth for 5 hours. The following table presents the results of the analysis of ammonia and glucose consumption, and alanine accumulation throughout the cultivation. Knowing that 500 mL of a cell suspension at a concentration of 5.0 g/L (inoculum) was added to the 4.5 L of medium in the reactor and that the YX/NH3 previously determined was 7.5, calculate:a) the maximum specific growth rateb) YX/S and YP/S yield factorsc) How long would it take to reach Cx = 30 g/L if the cells continued with the exponential growth profile until the end of the culture (without nutrient deprivation or any type of inhibition)?d) Describe how the mathematical treatment of the data should be done to determine the type of product formation…
- How much 340bp insert DNA should be added to a ligation in which 50ng of 4.3kb vector will be used? The desired vector: insert molar ratio needs to be 1:3.Currently I am working with qPCR quantification specific for Lactobacillus bacteria. I found in some cases, the sample showing multiple peaks of melting curves while others looks perfect, so do the amplification plot duplication. Any one have an opinion about this issues? Does it caused by sample DNA quality, the omount of the bacteria detected, or primers problem? I am condisering that this condition reflecting the low abundance of the specific bacteria inside its sample.In a nutrient medium that lacks histidine, a thin layer of agar containing ~109 Salmonella typhimurium histidine auxotrophs (mutant cells that require histidine to survive) produces ~13 colonies over a two-day incubation period at 37 ° C. How do these colonies arise in the absence of histidine? The experiment is repeated in the presence of 0.4 μg of 2-aminoanthracene. The number of colonies produced over two days exceeds 10,000.What does this indicate about 2-aminoanthracene? What can you surmise about its carcinogenicity?
- The physician ordered platinum 100 mg/m2 iv to infuse over 6 hours once 4 weeks for a patient who has a bsa of 1.66m2. (a) how many mg of this antineoplastic drug should the patient receive? (b) if the dose of cisplatin were administered in 1,000 ml d5 1/2 ns, at how many ml/hr would the iv run?A plaque assay is performed beginning with 1 mL of a solution containing bacteriophages. This solution is serially diluted 3 times by combining 0.1 mL of each sequential dilution with 9.9 mL of liquid medium. Then 0.1 mL of the final dilution is plated in the plaque assay and yields 12 plaques.What is the initial density of bacteriophages in the original 1 mL? Enter your answer to two significant figures ( for example: 1.1 * 10^2). a. You want to perform an interrupted-mating mappingwith an E. coli Hfr strain that is Pyr+, Met+, Xyl+,Tyr+, Arg+, His+, Mal+, and Strs. Describe anappropriate bacterial strain to be used as theother partner in this mating.b. In an Hfr × F− cross, the pyrE gene enters therecipient in 5 minutes, but at this time point thereare no exconjugants that are Met+, Xyl+, Tyr+,Arg+, His+, or Mal+. The mating is now allowed toproceed for 30 minutes and Pyr+ exconjugants areselected. Of the Pyr+ cells, 32% are Met+, 94% areXyl+, 7% are Tyr+, 59% are Arg+, 0% are His+, and71% are Mal+. What can you conclude about theorder of the genes?