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 4
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
Guida verificata passo dopo passo1
Step 1: Understand the term 'heat-labile' which refers to substances that are sensitive to heat and can be denatured or destroyed by high temperatures.
Step 2: Review each sterilization method listed and consider whether it involves high heat that could damage a heat-labile solution or the plastic container.
Step 3: Gamma radiation (a), ethylene oxide (b), supercritical fluids (c), and short-wavelength radiation (e) are sterilization methods that do not rely on high temperatures and are generally safe for heat-sensitive materials.
Step 4: Autoclaving (d) uses high-pressure saturated steam at temperatures around 121°C, which is a high-heat process and can damage heat-labile solutions and plastic containers.
Step 5: Conclude that autoclaving is the sterilization method that cannot be used for heat-labile solutions stored in plastic containers due to its high temperature.
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Heat-labile Solutions
Heat-labile solutions are sensitive to high temperatures and can be damaged or denatured when exposed to heat. Understanding this is crucial because sterilization methods involving heat, such as autoclaving, are unsuitable for these solutions to prevent degradation of their components.
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02:18
Homogenous vs. Heterogenous Solutions
Sterilization Methods and Their Mechanisms
Sterilization methods vary in their approach: autoclaving uses moist heat under pressure, gamma radiation and short-wavelength radiation use ionizing and non-ionizing radiation respectively, ethylene oxide is a chemical sterilant, and supercritical fluids use unique solvent properties. Knowing how each method works helps determine their compatibility with different materials.
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05:16Streak-Plate Method
Material Compatibility in Sterilization
The container material, such as plastic, affects which sterilization methods can be used without damage. Some methods, like autoclaving, may deform plastics due to heat, while others like ethylene oxide or radiation can sterilize without compromising container integrity. This concept is key to selecting appropriate sterilization techniques.
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02:16Composition of Item to Be Treated
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) ________.
1314
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Domanda del libro di testo
A bacterial culture was in log phase in the following figure. At time x, an antibacterial compound was added to the culture. Draw the lines indicating the addition of a bactericidal compound and a bacteriostatic compound. Explain why the viable count does not immediately drop to zero at x.
1470
views
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
views
Domanda del libro di testo
Which of these disinfectants does not act by disrupting the plasma membrane?
a. Phenolics
b. Phenol
c. Quats
d. Halogens
e. Biguanides
1287
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