Textbook Question
Hyperthermophilic prokaryotes may remain viable in canned goods after commercial sterilization. Why is this situation not dangerous to consumers?
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Ch. 9 - Controlling Microbial Growth in the Environment
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 9, Problem 10
Compare and contrast the action of alcohols, halogens, and oxidizing agents in controlling microbial growth.
Verified step by step guidance1
Step 1: Define the general mechanism of action for alcohols in microbial control. Explain that alcohols, such as ethanol and isopropanol, primarily denature proteins and disrupt cell membranes, leading to leakage of cellular contents and cell death. Emphasize their effectiveness against bacteria and enveloped viruses but limited action on spores.
Step 2: Describe how halogens, like chlorine and iodine, control microbial growth. Highlight that halogens act by oxidizing cellular components, including proteins and nucleic acids, and can penetrate cell walls to cause irreversible damage. Note their broad-spectrum activity, including effectiveness against bacteria, viruses, fungi, and spores (depending on concentration and exposure).
Step 3: Explain the role of oxidizing agents such as hydrogen peroxide and peracetic acid. Discuss that these agents produce reactive oxygen species that damage proteins, lipids, and DNA, leading to oxidative stress and cell death. Mention their ability to kill a wide range of microorganisms, including spores, due to strong oxidizing properties.
Step 4: Compare the spectrum of activity and limitations of each group. For example, alcohols are rapid and effective but not sporicidal; halogens are broad-spectrum but can be inactivated by organic matter; oxidizing agents are potent and sporicidal but may be unstable or corrosive.
Step 5: Summarize the practical applications and considerations for each agent in microbial control, such as alcohols being used for skin antisepsis, halogens for water disinfection, and oxidizing agents for sterilization of medical equipment.
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Key Concepts
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Mechanism of Action of Alcohols
Alcohols, such as ethanol and isopropanol, control microbial growth primarily by denaturing proteins and dissolving lipids in the cell membrane. This disrupts membrane integrity, leading to leakage of cellular contents and cell death. They are effective against bacteria and enveloped viruses but less so against spores.
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Alcohols
Role of Halogens in Microbial Control
Halogens like chlorine and iodine act as strong oxidizing agents that disrupt microbial proteins and nucleic acids. They penetrate cells and oxidize essential enzymes, leading to cell death. Halogens are broad-spectrum antimicrobials effective against bacteria, viruses, fungi, and spores under certain conditions.
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Function of Oxidizing Agents
Oxidizing agents such as hydrogen peroxide and peracetic acid kill microbes by producing reactive oxygen species that damage cellular components including DNA, proteins, and lipids. They are effective against a wide range of microorganisms, including spores, and are often used for sterilization and disinfection.
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Related Practice
Textbook Question
Which of the following substances would most effectively inhibit anaerobes?
a. Phenol
b. Silver
c. Ethanol
d. Hydrogen peroxide
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Textbook Question
Which of the following types of radiation is more widely used as an antimicrobial technique?
a. Electron beams
b. Visible light waves
c. Radio waves
d. Microwaves
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Textbook Question
The preservation of beef jerky from microbial growth relies on which method of microbial control?
a. Filtration
b. Lyophilization
c. Desiccation
d. Radiation
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Textbook Question
Which of the following adjectives best describes a surgical procedure that is free of microbial contaminants?
a. Disinfected
b. Sanitized
c. Degermed
d. Aseptic
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Textbook Question
Compare and contrast desiccation and lyophilization.
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