Domanda del libro di testo
Thermal death point is not considered an accurate measure of the effectiveness of heat sterilization. List three factors that can alter thermal death point.
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Ch. 7 - The Control of Microbial Growth
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398
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TOC.tableOfContents
- Ch. 1 - The Microbial World and You18
- Ch. 2 - Chemical Principles20
- Ch. 3 - Observing Microorganisms Through a Microscope18
- Ch. 7 - The Control of Microbial Growth20
- Ch. 9 - Biotechnology & DNA Technology20
- Ch. 10 - Classification of Microorganisms15
- Ch. 11 - The Prokaryotes: Domains Bacteria and Archaea14
- Ch. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and Helminths17
- Ch. 13 - Viruses, Viroids, and Prions20
- Ch. 14 - Principles of Disease and Epidemiology21
- Ch. 15 - Microbial Mechanisms of Pathogenicity19
- Ch. 16 - Innate Immunity: Nonspecific Defenses of the Host20
- Ch. 17 - Adaptive Immunity: Specific Defenses of the Host20
- Ch. 18 - Practical Applications of Immunology20
- Ch. 19 - Disorders Associated with the Immune System19
- Ch. 20 - Antimicrobial Drugs19
- Ch. 21 - Microbial Diseases of the Skin and Eyes21
- Ch. 22 - Microbial Diseases of the Nervous System19
- Ch. 23 - Microbial Diseases of the Cardiovascular and Lymphatic Systems20
- Ch. 24 - Microbial Diseases of the Respiratory System20
- Ch. 25 - Microbial Diseases of the Digestive System20
- Ch. 26 - Microbial Diseases of the Urinary and Reproductive Systems19
- Ch. 27 - Environmental Microbiology20
- Ch. 28 - Applied and Industrial Microbiology19
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Capitolo 4, Problema 3
Which of these disinfectants does not act by disrupting the plasma membrane?
a. Phenolics
b. Phenol
c. Quats
d. Halogens
e. Biguanides
Guida verificata passo dopo passo1
Step 1: Understand the mechanism of action of each disinfectant listed. Disinfectants can act by various mechanisms, including disrupting the plasma membrane, denaturing proteins, or oxidizing cellular components.
Step 2: Recall that phenolics and phenol primarily disrupt the plasma membrane by damaging lipid components, leading to leakage of cellular contents.
Step 3: Recognize that quaternary ammonium compounds (quats) and biguanides also act mainly by disrupting the plasma membrane, causing cell lysis.
Step 4: Identify that halogens (such as chlorine and iodine) act differently; they typically kill microbes by oxidizing cellular components, including proteins and nucleic acids, rather than primarily disrupting the plasma membrane.
Step 5: Conclude that among the options, halogens do not act by disrupting the plasma membrane but instead by oxidation, which is a distinct antimicrobial mechanism.
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Mechanism of Action of Disinfectants
Disinfectants kill or inhibit microbes through various mechanisms, such as disrupting cell membranes, denaturing proteins, or oxidizing cellular components. Understanding how each disinfectant works helps determine their effectiveness and specific targets within microbial cells.
Video consigliato:
05:21
Types of Disinfectants
Plasma Membrane Disruption
Many disinfectants act by damaging the plasma membrane, causing leakage of cellular contents and cell death. Agents like phenolics, quaternary ammonium compounds (quats), and biguanides typically disrupt membrane integrity, leading to loss of vital functions.
Video consigliato:
02:10Biological Membranes
Halogens as Oxidizing Agents
Halogens, such as chlorine and iodine, primarily kill microbes by oxidizing cellular components like proteins and nucleic acids rather than disrupting the plasma membrane. This oxidative damage impairs essential cellular functions, leading to microbial death.
Video consigliato:
00:56Liquid Chemicals: Halogens
Pratica correlata
Domanda del libro di testo
Which of the following is used to control microbial growth in foods?
a. Organic acids
b. Alcohols
c. Aldehydes
d. Heavy metals
e. All of the above
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Domanda del libro di testo
The antimicrobial effect of gamma radiation is due to:(a) ________.
The antimicrobial effect of ultraviolet radiation is due to: (b) ________.
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Domanda del libro di testo
Which of the following is most effective for sterilizing mattresses and plastic Petri dishes?
a. Chlorine
b. Ethylene oxide
c. Glutaraldehyde
d. Autoclaving
e. Nonionizing radiation
1070
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Domanda del libro di testo
Which of the following cannot be used to sterilize a heat-labile solution stored in a plastic container?
a. Gamma radiation
b. Ethylene oxide
c. Supercritical fluids
d. Autoclaving
e. Short-wavelength radiation
1134
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Domanda del libro di testo
If pasteurization does not achieve sterilization, why is pasteurization used to treat food?
1146
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