Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 6MCQ
The data were obtained from a use-dilution test comparing four disinfectants against Salmonella choleraesuis. G = growth, NG = no growth
6. Which disinfectant is the most effective?
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Z-germicSide is an antimicrobial agent. Based on the given data set below, describe how effective Z-germicSide is as a disinfectant.
Name of disinfectant
Z-germicSide
Phenol
KEY: No growth, += Growth
Dilution
1:100
1:125
1:150
1:175
1:200
1:95
1:100
1:105
1:110
1:115
Growth after 5 mins
+
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+
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Growth after 10
minutes
+
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Growth after 15
mins
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If 5% w/v concentration of a bactericide of dilution coefficient of 3 takes 25 minutes to effect killing, what will be the time of kill when it is diluted 8 times
A sanitizer with dilution coefficient of 0.5 takes 3 minutes to effect killing. If it takes 18 minutes to kill when it is diluted 5times, what is the initial concentration?
An unknown concentration of ‘LD’ disinfectant killed 106 viable cells of Sporotrichum schenkii within a certain time. When the concentration was increased 2-fold the extinction time decreased a 103-fold. Determine the concentration exponent of this disinfectant
Answer the following questions briefly and concisely
1.How do bacteria in a chemostat and those in a batch culture vary from one another? 2. What happens in a chemostat if the dilution rate is higher than the organism's maximum specific growth rate? 3.Does a chemostat require the use of pure cultures? 4. Why would a complicated culture media for Leuconostoc mesenteroides be simpler to make than one with a fixed chemical composition?
Chapter 7 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 7 - The thermal death time for a suspension of...Ch. 7 - If pasteurization does not achieve sterilization,...Ch. 7 - Thermal death point is not considered an accurate...Ch. 7 - Prob. 4RCh. 7 - DRAW IT A bacterial culture was in log phase in...Ch. 7 - How do autoclaving, hot air, and pasteurization...Ch. 7 - How do salts and sugars preserve foods? Why are...Ch. 7 - Prob. 8RCh. 7 - A large hospital washes burn patients in a...Ch. 7 - Prob. 10R
Ch. 7 - Which of the following does not kill endospores?...Ch. 7 - Which of the following is most effective for...Ch. 7 - Prob. 3MCQCh. 7 - Which of the following cannot be used to sterilize...Ch. 7 - Prob. 5MCQCh. 7 - The data were obtained from a use-dilution test...Ch. 7 - The data were obtained from a use-dilution test...Ch. 7 - Prob. 8MCQCh. 7 - A classmate is trying to determine how a...Ch. 7 - Which of the following is most likely to be...Ch. 7 - Prob. 1ACh. 7 - For each of the following bacteria, explain why it...Ch. 7 - A use-dilution test was used to evaluate two...Ch. 7 - To determine the lethal action of microwave...Ch. 7 - Entamoeba histolytica and Giardia lamblia were...Ch. 7 - Between March 9 and April 12five chronic...Ch. 7 - Prob. 3CAE
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