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- Determine what percentage of the culture was living (viable) and what percentage was dead (mortality). Plates Plate Dilution Volume plated No.of colonies Avg No Concentration of diluted sample Cd(cells/mL) Concentration of original sample Cu(cells/mL) 1 10^-3 10ul R1=130,R2= 110,R3=210 150 150mL 1.50*10^6 Volume of cells(mL) Volume of diluent(mL) Total dilution(D) Hemocytometer count Avg cells in 1 mm^2 area Concentration of diluted sample Cd(cells/mL) Concentration of original sample Cu(cells/mL) 4.3 0.5 0.1 grid 1= 171 , grid2 = 185 178 1.78*10^5 1.78*10^6Using saline tubes containing 9 ml of saline (for dilutions), draw a diagram that would yield between 30 and 300 colonies from an original broth culture that contains 5 * 10^8 cells/ml. Indicate volumes used and dilutions made for each tube and plate.The following is result from a standard plate count. What is the cell density of the undiluted culture? Please follow all SPC rules. (TNTC: too numerous to count)
- Below is a diagram of the serial dilution of a culture with 1 x 10º cells. Fill out the missing information. 250 Culture Diluent 1 x 10° cells/mL 9 mL 9 mL 9.9 mL 9.9 mL 99.9 mL Volume to add to diluent Final Dilution level Theoretical count after plating 100 uLDescribe how you would execute this first stage from the point you are handed the nutrient broth tube containing the mixed culture, through to the appearance of two colony types on a nutrient agar plate. Assume you have all the necessary equipment and materials at your disposal. Be concise, but thorough; limit yourself to a short paragraph (1/4-1/2 page at most) – include the method and techniques; what you expect to see, and how you would avoid contamination during the process.Given the scenario, compute for the total volume of the culture media solution (milliliter or liter) and dehydrated media (grams). Scenario: The students of a Microbiology class were tasked to transfer or subculture a pure culture of Escherichia coli bacterium in five 7 mL nutrient broth and five petri dishes of nutrient agar with 20 mL capacity each. Based on the instruction bottles for nutrient broth and nutrient agar, preparation of the culture media is as follows. Nutrient broth: 8 g/liter Nutrient agar: 28 g/liter Formula: C1V1 = C2V2 *Concentration *Volume Computation: What are the answers to the following. Weight in grams of nutrient broth: _________ Distilled water in mL for nutrient broth: __________ Weight in grams of nutrient agar __________ Distilled water in mL for nutrient agar: ____________
- You are given a bacterial culture which has a concentration of approximately 5.0 x 10^8 cells/mL. List a series of dilutions and platings that you could carry out in order to determine the exact concentration of the culture. Note that you must plate four plates from a minimum of two dilution tubes. The volumes plated should be in the range of 0.1 mL – 1.0 mL. Duplicate volumes may not be plated from any one dilution tube. Each plating should aim for a count between 30 and 300 CFUs. You can select any value from 30-300 for CFU and any volume from 0.1-1.0 to find out dilution schemeWhat is the physical appearance (solid, liquid, semi-solid) of following media:Agar deep tubeThe number of bacterial cells in a culture broth is to be determined by a culture technique. Serial dilutions were performed and a 0.1 mL aliquot from each dilution was spread onto Plate Count Agar (PCA). The number of bacterial colony forming units (CFU) after overnight incubation are shown as listed in the table below. What is the number of colony forming units per mL of the culture broth? Choose only the most appropriate plate for your calculation. Give your answer as the number only (do not add text for the units). You may use scientific notation with the format 1.12e+6 (that is, 1.12 x 106 cfu/mL). (Note: Canvas will then display your answer a whole number.) Plate 1 10 Plate 2 10 Plate 3 10 dilution dilution dilution Plate 4 10 dilution Plate 5 107 dilution Plate 6 10 dilution -6 *Too many to count Number of colony forming units (CFU) TMTC* TMTC* 840 28 19 1
- The number of bacterial cells in a culture broth is to be determined by a culture technique. Serial dilutions were performed and a 0.1 mL aliquot from each dilution was spread onto Plate Count Agar (PCA). The number of bacterial colony forming units (CFU) after overnight incubation are shown as listed in the table below. What is the number of colony forming units per mL of the culture broth? Choose only the most appropriate plate for your calculation. Give your answer as the number only (do not add text for the units). You may use scientific notation with the format 1.12e+6 (that is, 1.12 x 106 cfu/mL). (Note: Canvas will then display your answer a whole number.) Plate Dilution Plate 1 10 dilution Plate 2 10 dilution Plate 3 107 dilution Plate 4 10 dilution Plate 5 107 dilution Plate 6 100 dilution *Too many to count Number of colony forming units (CFU) TMTC* 382 83 10 2 0Refer 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.1,000,000Five ml of bacterial culture is added to 45 ml of sterile diluent. From this suspension, the following serial dilutions were made, two 1:100 and one 1:10 dilutions, and 0.1 ml is plated onto Plate Count Agar from the last dilution. After incubation, 186 colonies were counted on the plate. 1. What is the dilution factor, or how much of the original sample was diluted?