a. 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.
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a. Explain whether or not any of the methods in fi gure 2.9 could be
used to determine the total number of cells present in a patient’s specimen.
b. After performing the streak plate method on a bacterial specimen, the
culture was incubated for 48 hours at 37°C. Upon viewing the plate, there
was heavy growth (with no isolated colonies) in the fi rst quadrant, but no
growth was apparent in the remaining quadrants. Please discuss errors in the procedure that could have produced this result.
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- 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…procedure/s in performing aseptic transfer of bacterial cultures in (include illustration) (3) agar plate to agar slant.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 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.procedure/s in performing aseptic transfer of bacterial cultures in (include illustration) (2) agar slant culture to agar slanta. What is the total dilution of Tube #4? Express the answer in exponential format. b. You plated 1 mL of the Tube #4, After incubating, you counted 500 colonies on the plate. What is the concentration of Tube #0? include units. c. How could you change the experiment in part B to get a plate in the countable range? Be specific about any dilution factors and/or plated volumes you would change.
- 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. Draw and describe the possible result that may be observed on an agar plate that utilized a 4- streak quadrant method for isolation WITHOUT the conduct of proper aseptic techniques Source of inoculum: Tap water Characteristic of colony: Yellow, circular colony with entire margin and convex elevation Answer: 2. Using your fingers, you are asked to aseptically touch the surface of a sterile agar plate. Illustrate the possible result from this step if your fingers are (a) unwashed – touched various things prior to placing on agar surface, and (b) washed with soap or disinfected with 70% alcohol. Describe the relative abundance of microbial growth observed on the plates. Unwashed Washed Answer. 3. List and draw the possible characteristics of an isolated bacterial colony that can be observed based on type of (a) margin, (b) elevation, (C) texture, and (d) optical property.1. Draw and describe the possible result that may be observed on an agar plate that utilized a 4-streak quadrant method for isolation WITHOUT the conduct of proper aseptic techniques Source of inoculum: Tap water Characteristic of colony: Yellow, circular colony with entire margin and convex elevation Answer: 2. Using your fingers, you are asked to aseptically touch the surface of a sterile agar plate. Illustrate the possible result from this step if your fingers are (a) unwashed – touched various things prior to placing on agar surface, and (b) washed with soap or disinfected with 70% alcohol. Describe the relative abundance of microbial growth observed on the plates. Unwashed Washed
- A.Why do you plate the cells from the viable count on LB agar without ampicillin? B.If you observe 100 colonies on your 1/100 plate, how many colonies do you expect if everything works perfectly on your 1/1000 plate?Refer to the provided image drawn by a student trying to plan out their serial dilution protocol. The student diluted the original culture into bottle A and then diluted it further into B as shown. The student then proceeded with plating out 0.1ml of the culture from bottle B onto the plate (Note: plate A shows the 0.1ml that was plated, no further dilutions were done). If 13 colonies grew on plate A, help the student figure out how many CFU (colony forming units) were in the original culture? Select one: a.1,300 b.13,000 c.None of the Above d.130,000 e.1,000,000A 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 colonies