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 2
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
Guida verificata passo dopo passo1
Step 1: Understand the nature of the materials to be sterilized. Mattresses and plastic Petri dishes are heat-sensitive and can be damaged by high temperatures or moisture.
Step 2: Evaluate each sterilization method's suitability for heat-sensitive materials: chlorine is a chemical disinfectant but not a sterilant and can damage materials; autoclaving uses high heat and pressure, which can deform plastics and mattresses; nonionizing radiation (like UV) has limited penetration and is mostly surface-level.
Step 3: Consider ethylene oxide, a gaseous sterilant that can penetrate porous materials and sterilize heat-sensitive items without damaging them, making it suitable for mattresses and plastic Petri dishes.
Step 4: Glutaraldehyde is a liquid chemical sterilant effective for instruments but less practical for large or porous items like mattresses and may leave residues on plastics.
Step 5: Conclude that ethylene oxide is the most effective sterilization method among the options for heat-sensitive and porous materials such as mattresses and plastic Petri dishes.
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Sterilization Methods and Their Applications
Sterilization refers to the complete elimination of all microorganisms, including spores. Different methods like autoclaving, chemical sterilants, and radiation vary in effectiveness depending on the material being sterilized. Understanding which method suits heat-sensitive or heat-resistant items is crucial for effective sterilization.
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05:16
Streak-Plate Method
Autoclaving and Its Mechanism
Autoclaving uses pressurized steam at high temperatures (usually 121°C) to kill all microbes and spores. It is highly effective for heat-resistant materials like metal and glass but can damage heat-sensitive items such as plastics or mattresses. Its efficiency and limitations must be considered when selecting sterilization methods.
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01:59Introduction to Avoiding Host Defense Mechanisms
Chemical Sterilants: Ethylene Oxide and Glutaraldehyde
Ethylene oxide is a gaseous sterilant effective for heat- and moisture-sensitive materials, penetrating porous items like mattresses and plastics without damage. Glutaraldehyde is a liquid disinfectant used for sterilizing medical equipment but requires long exposure times and may not be suitable for all materials. Their chemical properties influence their practical use.
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03:22Chemical Gases: Ethylene Oxide
Pratica correlata
Domanda del libro di testo
Which of the following does not kill endospores?
a. Autoclaving
b. Incineration
c. Hot-air sterilization
d. Pasteurization
e. All of the above kill endospores
1086
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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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Domanda del libro di testo
The thermal death time for a suspension of Bacillus subtilis endospores is in dry heat and less than in an autoclave. Which type of heat is more effective? Why?
1208
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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
views
Domanda del libro di testo
If pasteurization does not achieve sterilization, why is pasteurization used to treat food?
1146
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