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
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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 1
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
Guida verificata passo dopo passo1
Step 1: Understand what endospores are — they are highly resistant structures formed by certain bacteria to survive extreme conditions, including heat, desiccation, and chemicals.
Step 2: Review each method's ability to kill endospores: Autoclaving uses pressurized steam at high temperatures, which is known to effectively kill endospores.
Step 3: Incineration involves burning at very high temperatures, which destroys all microbial life including endospores.
Step 4: Hot-air sterilization uses dry heat at high temperatures for a longer time and is also effective against endospores.
Step 5: Pasteurization involves heating to moderate temperatures for a short time, primarily to reduce microbial load but does not reliably kill endospores.
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Endospore Resistance
Endospores are highly resistant dormant structures formed by some bacteria to survive extreme conditions. They can withstand heat, desiccation, chemicals, and radiation, making them difficult to kill with standard sterilization methods.
Video consigliato:
05:35
Endospores
Sterilization Methods and Their Efficacy
Different sterilization techniques vary in their ability to kill microorganisms. Autoclaving uses pressurized steam to achieve high temperatures that destroy endospores, while incineration burns them completely. Hot-air sterilization requires longer exposure at high temperatures to kill spores effectively.
Video consigliato:
05:16Streak-Plate Method
Pasteurization and Its Limitations
Pasteurization involves heating liquids to moderate temperatures to reduce microbial load but does not reach levels sufficient to kill endospores. It is primarily used to destroy vegetative pathogens, not the highly resistant endospores.
Video consigliato:
03:50Pasteur's Experiments on Spontaneous Generation
Pratica correlata
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?
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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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