With a doubling time of 180 minutes and a starting population size of 10 cells, how many cells will be present after 72 hours, assuming no cell death?
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With a doubling time of 180 minutes and a starting
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- Assuming that no cells die, how many cells will there be in one week?Proteus vulgaris has a doubling time of roughly 28 minutes. If an initial population of 500 cells is allowed to grow for 6 hours in ideal conditions, what will be the final population? Use three significant figures for your final answer (e.g. 16,796.654 would become 16,800).Disinfectants, be they heat or radiation or chemicals, usually kill a constant proportion of the cells present per unit time if the cells are all equally susceptible. Hence, the term ‘log kill.’ The probability of death is constant over time given a ‘single hit.’ The more cells present at the start, the greater the number killed per unit time and the longer it will take to kill them ‘all.’ One decimal reduction is one log place (exponent). Log Nt = Log N0 – t/D. D is the time required for a log kill. A suspension of 105 CFU/mL of Salmonella is treated with bleach, and 90% of the cells are dead after 10 minutes. How many viable cells per mL would you expect after 30 minutes? Yes, the 30 minutes here implies 3 logs of killing. This is an excellent problem to use with the Death Equation because you can reason it through first, and then solve it using the equation.
- Calculate the generation time in a growth experiment in which a medium was inoculated with 5 X 106 cells/mL of E. coli cells and following a 1 hour lag, grew exponentially for 5 hours, after which the population was 5.4 X 109cells/mLIf you start out population density of 300 cfu/ml of a bacterium that divides every 20 minutes,what will be the population density after five generations assuming the cells are in the log phase of growth?A culture is inoculated with 109 cells/mL at noon. At ten PM, the population is determined to be 115 cells/mL. What is the number of generations? What is the doubling time?
- If the original number of cells in a sample was 12,000, how many bacteria will be present in 12 hours when the generation time is 15 minutes?If it takes 2 hours for a population of bacteria to grow from 100 cells to 1600 cells, what is the generation time of this bacterial species? 15 minutes 20 minutes 30 minutes 40 minutesIn EMPEROR-Reduced study in jardiance, _______ treated patients with HFrEF were 65 years of age and older.
- If the generation time is 90 min and the initial population contains 103 cells, how many bacteria will there be after 8 hours of exponential growth?What is the doubling time, in minutes, of a bacterial population that went from 100 to 100,000 cells in 5 hours?if there are 1,000,000 bacteria and 90% of them are killed, how many bacteria remain?