Podcast
Questions and Answers
Which method is effective for removing microbial spores from air and liquids?
Which method is effective for removing microbial spores from air and liquids?
- Alcohols
- Filtration (correct)
- Quaternary ammonium compounds
- Intermediary-level germicides
What is a primary characteristic of alcohols as germicides?
What is a primary characteristic of alcohols as germicides?
- Their mechanism of action depends on concentration. (correct)
- They destroy all bacterial spores at room temperature.
- They are highly effective against all fungi.
- They effectively inactivate nonenveloped viruses.
Which germicide is classified as a high-level disinfectant?
Which germicide is classified as a high-level disinfectant?
- Glutaraldehyde (correct)
- Alcohols
- Hydrogen peroxide
- Chlorine
What mechanism does ethylene oxide primarily use to disinfect?
What mechanism does ethylene oxide primarily use to disinfect?
Which statement about quaternary ammonium compounds is correct?
Which statement about quaternary ammonium compounds is correct?
Flashcards
Filtration
Filtration
A method that removes microbes from air and liquids by physically trapping them.
Intermediate-Level Germicides
Intermediate-Level Germicides
Chemicals that kill fungi and some viruses, but not bacterial spores or resistant pathogens. They are used to disinfect non-invasive items.
Halogens (Chlorine and Iodine)
Halogens (Chlorine and Iodine)
Common antimicrobial disinfectants and antiseptics that are effective against a wide range of microbes.
Alcohol's Mechanism of Action
Alcohol's Mechanism of Action
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Hydrogen Peroxide's Germicidal Action
Hydrogen Peroxide's Germicidal Action
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Study Notes
Chapter 11 Notes: Removing Microbes
- Filtration: Effective for removing microbes from air and liquids.
- Intermediate-Level Germicides: Kill fungi, but not all bacteria (spores). Also kill resistant pathogens and viruses. Not suitable for invasive items.
- Halogens: A group of chemicals (like chlorine and iodine) often applied as disinfectants/antiseptics.
- Alcohols: Effectiveness depends on concentration. Doesn't destroy bacterial spores at room temperature, but can destroy resistant vegetative forms. Alcohol readily inactivates enveloped viruses due to a surfactant effect on the virus envelope.
- Hydrogen Peroxide: Has germicidal effects due to direct/indirect actions of oxygen. Oxygen forms hydroxyl free radicals.
- Glutaraldehyde: Rapid, broad-spectrum sterilant/high-level disinfectant.
- Ethylene Oxide (ETO): Very strong alkylating agent. Reacts with DNA and proteins, blocking DNA replication/enzymatic actions.
- Quaternary Ammonium Compounds: Activity greatly reduced by organic matter. Requires alkaline conditions to function; only low to moderate level disinfection.
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Description
This quiz focuses on various techniques for removing microbes, based on Chapter 11 notes. Covering filtration, germicides, and chemical disinfectants, the quiz delves into their effectiveness and application contexts. Test your understanding of these critical concepts in microbiology.
