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Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
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Chapter 7, Problem 4R
Summary Introduction
To review:
Effects of gamma radiation and UV radiation on microorganisms.
Introduction:
Antimicrobial is an agent that kills and stops the growth of microorganisms. Gamma radiation is an ionizing radiation with shorter wave length having the ability to penetrate deeply. UV radiation is a non-ionizing radiation with longer wave length having minimum ability to penetrate.
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Students have asked these similar questions
Identify the single most correct choice: ()
a) lodine can inactivate microbial cellular proteins.
( b) Alcohols may dissolve lipids and hence possess antimicrobial activities.
c) Moist heat may result in protein denaturation and hence possess antimicrobial activities.
7 d) a and c
e) b and c
f) a, b and c
Could an organism that is susceptible to an antimicrobial agent in laboratory testing fail to respond to it when that drug is used to treat the patient? Explain.
Savlon Extra” disinfectant is known to exhibit good antimicrobial activity against Shigella dysenteriae. At 20oC a concentration of 5% v/v kills 2.0 x106 Sh. dysenteriae cells in 15 minutes. At 25oC the organisms were killed in 5 minutes.
a) Calculate the temperature coefficient of Savlon Extra
b). How long will it take the same concentration to kill the same number of Sh. dysenteriae cells at 30oC?
Chapter 7 Solutions
Microbiology: An Introduction
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 - To determine the lethal action of microwave...Ch. 7 - A use-dilution test was used to evaluate two...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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- The benefits of properly using radioactivity include al Treating cancer in human beings. Ob) Irradiating food to kill harmful bacteria. c) All of these Od) Measuring the proper amounts of fertilizer on farms.arrow_forwardWhich statement among A-D is false regarding physical and chemical agents of control? A) O Effective killing of bacteria via irradiation with UV light would likely take longer than if irradiated with gamma rays or x-rays. B) O Detergent-type disinfectants exert their effect by solubilizing membranes. C) O Antiseptics are generally not as strongly concentrated as disinfectants D) O Sterilization and pasteurization are equivalent processes.arrow_forwardWhy might Gamma irradiation be considered better than using UV radiation?arrow_forward
- The type of antimicrobial drug that would be most likely to have toxic effects in humans based on the premise of selective toxicity when treating microbial infection would be a drug that O 1) inhibits the synthesis of the cell wall O 2) inhibits metabolic pathways O 3) disrupts the cytoplasmic membrane 4) inhibits protein synthesis 5) All of the above have equal potential to be toxicarrow_forwardQuestion 12 Which of the following statements regarding foodborne botulism is correct? Question 12 options: a) An effective vaccine is available for the prevention of botulism b) Botulism is not life-threatening, even when the infection is left untreated c) Large amounts of bacteria must be consumed to cause botulism d) Botulism is an example of an intoxicationarrow_forward(1) How did u measure the zone of inhibition (2) Which unit of measurement was used (3) For two organisms,choose two antimicrobial and explain whether the organism was susceptible, intermediate or resistant. Please make the answer as short as possible .Thanksarrow_forward
- 1.) During a laboratory activity, Chemical reactions from mixture of chemicals should be observed under which laboratory equipment? a.) autoclave b.) fume hood c.) Labaratory Safety cabinet d.) Centrifuge 2.) Which type of equipment contains a HEPA filter that only removes suspended materials from exhausted air? a.) Fume hood b.) Biosafety Cabinet I c.) Biosafety Cabinet II d.) Biosafety Cabinet IIIarrow_forwardWhich of the following is NOT a property of an antimicrobial agent? a. Must have a known concentration over a period of time required to eliminate a pathogen b. all choices are correct c. must be selectively toxic d. Must have a favorable chemotherapeutic indexarrow_forwardA research scientist is developing a new antimicrobial drug for a pharmaceutical company. Discuss at least 4 attibutes that this drug should posses in order to be an ideal antimicrobial drug.arrow_forward
- Discuss the THREE (3) main stages crucial to microbial leaching of copper from a low-grade ore, indicating the reactions where necessary. In your answer, state ONE (1)example of a bacterium useful to this process.arrow_forwardPlease help me if I selected correct answerarrow_forwardControl of Microbial Growth A) Which would be the best process to use and why? B) Can you use pasteurization? Explain. C)What is the true definition of an "antibiotic?"arrow_forward
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