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The table below is from the lethal effects of heat for E. coli. What is the TDP for this organism? (Please include the unit.)
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- Escherichia coli but not Pyrolobus fumarii will grow at 40°C,while P. fumarii but not E. coli will grow at 110°C. What ishappening (or not happening) to prevent growth of eachorganism at the nonpermissive temperature?DRAW IT Draw the following growth curves for E. coli, starting with 100 cells with a generation time of 30 minutes at 35°C 60 minutes at 20°C, and 3 hours at 5°C. (A) The cells are incubated for 5 hours at 35°C. (B) After 5 hours, the temperature is changed to 20°C for 2 hours. (C) After 5 hours at 35°C, the temperature is changed to 5°C for 2 hours followed by 35°C for 5 hours. *If the temperature of the incubator were to be increased from 35 to 45°C, how would this affect the bacterial growth curve of E. coli? (optimum temperature 20o-40oC; most human pathogens)
- The diagram shows the growth curve of Escherichia coli in a suspension culture containing glucose and lactose. Optical density is used to measure the concentration of bacteria in the suspension culture. Use the image to answer the question. Which statement BEST supports the information in the graph? A. E. coli metabolizes lactose and glucose. B. E. coli metabolizes glucose first, then lactose. C. E. coli metabolizes lactose first, then glucose. D. E. coli metabolizes lactose and glucose at the same time.In an experiment to calculate the decimal reduction time for an Escherichia coli culture, viable cells were exposed to a constant temperature of 80°C for a set amount of time. After exposure, the remaining number of surviving cells were counted. Based on Table 1, what is the decimal reduction time?Table 1. Decimal Reduction Time for E. coli Heated to 80°C Total time of exposure (minutes): Number of Microbial Cells Present: 0 100 1 80 3 50 4 42 6.5 26 13 10 21 0How long does it take for E. coli to go from lag phase at time 0 to log phase to stationary phase to death phase? Can you point me to a citable source of this time period? I can't find anything online. Thank you.
- A 23 year old woman has 10 E coli in her bladder. The organism has generation time of 20 minutes. After a lag of 20 minutes, the E. coli entered the log phase of growth. After 3 hours, what is the total number of cells?Draw the following growth curves for E. coli, starting with 100 cells with a generation time of 30 minutes at 35°C 60 minutes at 20°C, and 3 hours at 5°C. The cells are incubated for 5 hours at 35°Ct /g = (Log Nt – Log N0) /0.301 I introduce a loopful of Escherichia coli cells (say, 1000) into 10 mL of Nutrient Broth at 8 p.m. the night before your lab. The cells were taken from a culture plate (Nutrient Agar) held at 37°C, and inoculated into broth at the same temperature. They were held at 37°C overnight in a shaking water bath. At what time would the culture reach the Stationary Phase? Recall that doubling time under optimal conditions (these are) is 20 minutes. A growing bacterial culture has 10,000 CFU/mL at noon and 10,000,000 CFU/mL at 6 p.m. What is the generation time under these conditions? What are your assumptions? At midnight you inoculate 10 mL of a culture of Enterococcus with 103 cells/mL into 990 mL of the same medium, held under the same conditions as the original culture. At what time would the culture reach 107 cells/mL? Assume exponential growth over the period. Assume that g=half an hour. Note: We worked a different variant of this problem in…
- A trp+, arg+ E. coli cell can grow on? A:Minimal medium B:Minimal medium plus amino acids C:Complete medium D:All of the aboveIf five E. coli cells are placed into sterile nutrient media under optimal conditions (with a growth rate of 20 minutes per cell division), how many E. coli cells will be present after 6 hours of optimal growth? 5 x 26 = 320 cells 5 x 29 = 2,560 cells 5 x 212 = 20,480 cells 5 x 215 = 163,840 cells 5 x 218 = 1,310,720 cellsE.coli was incubated with aeration in a nutrient medium containing two carbon sources provided one at a time, and the following growth curve was made from this culture. a. Explain what happened at the time marked x. b. Which substrate provided “better” growth conditions for the bacteria? How can you tell?