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 1
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?
Guida verificata passo dopo passo1
Understand the concept of thermal death time (TDT), which is the time required to kill a specific microorganism at a given temperature.
Recognize that dry heat and moist heat (such as in an autoclave) differ in their mechanisms of killing microorganisms: dry heat kills primarily by oxidation, while moist heat kills by coagulating proteins.
Recall that moist heat is generally more effective at lower temperatures and shorter times because it penetrates cells better and denatures proteins more efficiently.
Compare the thermal death times given: since the TDT is less in an autoclave (moist heat) than in dry heat, it indicates that moist heat is more effective at killing Bacillus subtilis endospores.
Conclude that moist heat (autoclaving) is more effective because it causes protein denaturation and coagulation more rapidly, leading to faster microbial death compared to dry heat.
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Thermal Death Time
Thermal death time is the minimum time required to kill a specific microorganism at a given temperature. It helps determine how long heat must be applied to ensure complete sterilization, especially for resistant forms like endospores.
Video consigliato:
04:07
Properties of Water- Thermal
Dry Heat vs. Moist Heat Sterilization
Dry heat sterilization uses hot air and kills microbes by oxidation, requiring higher temperatures and longer times. Moist heat, such as autoclaving, uses steam under pressure, which penetrates cells better and denatures proteins more efficiently, making it generally more effective.
Video consigliato:
04:19Moist Heat
Endospore Resistance
Endospores are highly resistant dormant forms of bacteria like Bacillus subtilis. Their tough outer layers protect them from heat and chemicals, but moist heat can penetrate and destroy them faster than dry heat due to better heat transfer and protein coagulation.
Video consigliato:
05:35Endospores
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
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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
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Domanda del libro di testo
If pasteurization does not achieve sterilization, why is pasteurization used to treat food?
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