A stock culture of S. aureus was serially diluted up to 10'you spread plate 0.1ml in the two nutrient agar Petri dishes and obtained 20 and 40 colonies, respectively. After 24 hours, the stock culture of S. aureus was serially diluted again up to 10 and 0.Iml was spread plated to the two Petri dishes and obtained 100 and 150 colonies, respectively a. That is the cfu/ml in the initial population of S. aureus b. What is the cfu/ml after 24 hours c. What is the generation time?
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- At the station there is a 2 mL microcentrifuge tube containing sheep blood and 3 tubes containing the following solutions: 0 mM, 300 mM, 600 mM of sucrose. The tubes are randomly labelled A, B, C. 2 mL of each solution were transferred to a different microcentrifuge tube, 20 ul of blood were then added to each tube, and they were mixed well by inverting the tube for multiple times. They were observed and it was determined whether the solution in each tube was hypotonic (Yes or No) relative to the blood cells. In addition, the solutions were diluted with water to help you determine which solution is which sucrose concentration. What sucrose concentration corresponds with each tube? Tube Hypotonic (Yes/No) Hypotonic after 1:1 dilution with water (Yes/No) Most likely Sucrose concentration (mM) A No Yes B Yes Yes C No NoAssuming that serial dilution was carried out in a laboratory experiment in 6 tubes with 9 ml of saline in each tube and 0.1ml of the stock solution was used for initial dilution, pour plate method of inoculation was performed after the dilution process using 1ml of the culture from the samples from the test tubes. It was found out that on the 6th Petri dish after incubation, there was a total of 16 individual colonies counted. Compute the total number of microorganisms present in tube one, assuming that there was no human error in the transferring proces.assuming that serial dilution was carried out in a laboratory experiment in 6 tubes with 9 ml of saline in each tube and 0.1ml of the stock solution was used for initial dilution, pour plate method of inoculation was performed after the dilution process using 1ml of the culture from the samples from the test tubes. It was found out that on the 6th Petri dish after incubation, there was a total of 16 individual colonies counted. Compute the total number of microorganisms present in tube one, assuming that there was no human error in the transferring process.
- A bacterial culture was grown for 12 hours. At 4-hour interval, the culture was sampled to determine the population of the culture, by transferring 25 ml of the suspension to 225 ml 0.90% NaCl. Three consecutive dilutions were further made by using I ml aliquot in 9 ml of 0.90% NaCl. One ml from each dilution was plated in each of duplicate plates. The following table shows the results of the plating method. 田 Sampling COUNTS 1st dilution 54; 61 2nd dilution 3rd dilution 4h dilution 1st 3; 7 0; 0 0,0 2nd TNTC TNCT 242: 233 28: 37 3rd TNTC TNTC INTC 249-246 * TNTC = Too numerous to count i. Illustrate the dilution series used and label the final dilution of each dilution. ii. Determine the bacterial count (CFU/ml) every 4 hours of incubation for 12 hours. Show all computations.1. A bacterial culture was grown for 12 hours. At 4-hour interval, the culture was sampled to determine the population ofthe culture, by transferring 25 mlof the suspension to 225 ml 0.90% NaCl. Three consecutive dilutions were further made by using 1 mlaliquot in 9 mlof 0.90% NaCl. One ml from each dilution was plated in each of duplicate plates. The following table shows the results of the plating method. EDI Sampling COUNTS 1st dilution 54; 61 TNTC 2nd dilution 3; 7 TNCT TNTC 3rd dilution 0; 0 242; 233 TNTC 4th dilution 0, 0 28: 37 249;246 1st 2nd 3rd TNTC * TNTC = Too numerous to count i. Determine the bacterial count (CFU/ml) every 4 hours of incubation for 12 hours. Show all computations. a. 1s* Sampling b. 2d Sampling c. 3* Samplinga. Explain whether or not any of the methods in fi gure 2.9 could beused to determine the total number of cells present in a patient’s specimen.b. After performing the streak plate method on a bacterial specimen, theculture was incubated for 48 hours at 37°C. Upon viewing the plate, therewas heavy growth (with no isolated colonies) in the fi rst quadrant, but nogrowth was apparent in the remaining quadrants. Please discuss errors in the procedure that could have produced this result.
- N. benthamiana will be infiltrated with a solution containing OD600=0.3 of each experimental Agro containing construct and OD600=0.1 of p19. Calculate the volume of cultures (V construct; V p19) needed according to the formulas: V construct = V final × 0.3/OD600; V p19 = V final × 0.1/OD600. One mL of infiltrate is often enough to complete a small experiment. How to plan your final volume accordingly?A pure bacterial culture of unknown concentration was diluted to determine the concentration of viable bacteria in the original culture. Serial dilutions were performed as 1. diagrammed below. Each dilution tube contained 400 ul of diluent and 100 ul was transferred into each tube. TSA plates were inoculated with 100 µul from the last three dilution tubes. a. What is the dilution between each tube shown in the diagram below? Express your answer as a ratio. b. What is the total dilution of tube number 5? Express your answer as a ratio. c. What is the concentration of viable bacteria in the original culture? Express your answer using scientific notation and the units CFU/ml. d. What is the concentration of viable bacteria in tube number 2? Express your answer using the units CFU/ml. e. If you inoculated a TSA plate with 250 µl from tube number 5, how many colonies would you expect to see after the plate was incubated? 1 2 3 5 423 80 13 Number of coloniesWhat are the possible reasons why culture plates may have too many colonies despite performing serial dilutions and OD600 readings?
- A sample of water was enumerated using a counting chamber (haemocytometer) and 220 bacterial cells were counted in 25 small squares (each of volume 2.5 x 10-7 cm3). Viable counts were carried out on the same culture using both the pour plate method (incorporating 1 mL samples of a range of dilutions into plate count agar plates) and the Miles & Misra spread plate method, where 0.02 mL samples were spread on sectors of a plate count agar plate. For the pour plate count the average of triplicate samples was 178 colonies per plate of the 10-4dilution. For the Miles and Misra count the average of triplicate samples was 21.3 colonies per sector of the 10-4 dilution. Calculate the total count and the viable pour plate and spread plate counts and suggest possible reasons for the difference between the three different counts.A pure bacterial culture of unknown concentration was diluted to determine the concentration of viable bacteria in the original culture. Serial dilutions were performed as 2. diagrammed below. A volume of 500 µl was transferred into each tube. TSA plates were inoculated with 100 µl from the last three dilution tubes. a. If the dilution between each tube is 102, what is the volume of diluent in each of the 5 dilution tubes? Provide the volume using ml as the units. b. What is the total dilution of tube number 4? Express the total dilution using scientific notation. c. What is the concentration of viable bacteria in the original culture? Express the concentration using scientific notation and CFU/ml as the units. d. If you inoculated a TSA plate with 1.0 ml from dilution tube 4, how many colonies would you expect to form on the plate after incubation? e. If the original culture had a volume of 50ml, what was the total number of viable bacteria in the 50 ml of the original culture? 1 2 3…What are the different manufacturing methods of Suppositories dosage form? Explain heat molding process using flow chart. Please explain at your own words.