Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 26, Problem 2ITD
The proteobacteria in the genus Pseudomonas are important spoilers of food. The rate at which food spoils is dependent on temperature. The data in the Figure show the relationship between the square root of the growth rate (how fast the population is growing per day; unitless) and the temperature of the culture.
Does typical refrigeration (temperature lowered to 4°C) appear sufficient to limit growth rate compared to room temperature (20°C)?
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A physician obtains a specimen from a patient with tuberculosis. This sample has one viable bacteria, an organism with slow doubling time in vitro of 48 hours, which corresponds to the growth rate constant in vitro of 0.04 h^-1. Estimating that the biomass of a single mycobacterial organism is 2.3x10^-13 g and that this organism is immediately going to enter the log phase, how many hours will it take to produce 10^-6 grams of biomass?
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):
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The data below were obtained for the growth of a pure culture of Escherichia coli in nutrient broth at a temperature of 37°C.
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Time (h) 0 1 2 3 4 8 16 32
Bacterial No./mL 104.1 103.9 104.4 105.5 106.5 107.7 108.0 107.6
Chapter 26 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 26.1 - Prob. 1SBCh. 26.1 - Prob. 2SBCh. 26.1 - Prob. 3SBCh. 26.1 - Prob. 4SBCh. 26.2 - What is a biofilm? Give an example of a biofilm...Ch. 26.2 - Prob. 2SBCh. 26.2 - Prob. 3SBCh. 26.3 - Prob. 1SBCh. 26.3 - Prob. 2SBCh. 26.3 - Prob. 3SB
Ch. 26.3 - Prob. 4SBCh. 26 - Prob. 1TYKCh. 26 - A bacterium that uses nitrites as its only energy...Ch. 26 - Prob. 3TYKCh. 26 - At the health center, a fecal sample was taken...Ch. 26 - Which of the following is not a property of an...Ch. 26 - Prob. 6TYKCh. 26 - Penicillin, an antibiotic, inhibits the formation...Ch. 26 - Prob. 8TYKCh. 26 - Prob. 9TYKCh. 26 - Prob. 10TYKCh. 26 - Prob. 11TYKCh. 26 - Prob. 12TYKCh. 26 - Prob. 13TYKCh. 26 - Prob. 14TYKCh. 26 - Prob. 1ITDCh. 26 - The proteobacteria in the genus Pseudomonas are...
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