Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs

Bauman - Microbiology with Diseases by Taxonomy 6th Edition

Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Non è quello che usi tu?Cambia libro di testo

Bauman 6th Edition

Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs

Problema 2

Capitolo 10, Problema 2

In a Kirby-Bauer susceptibility test, the presence of a zone of inhibition around disks containing antimicrobial agents indicates __________ .
a. That the microbe does not grow in the presence of the agents
b. That the microbe grows well in the presence of the agents
c. The smallest amount of the agent that will inhibit the growth of the microbe
d. The minimum amount of an agent that kills the microbe in question

Guida verificata passo dopo passo

Understand the purpose of the Kirby-Bauer susceptibility test: it is used to determine the sensitivity of bacteria to various antimicrobial agents by observing bacterial growth around antibiotic disks on an agar plate.

Recognize that the 'zone of inhibition' is the clear area surrounding an antimicrobial disk where bacterial growth has been prevented or reduced.

Interpret the presence of a zone of inhibition as an indication that the antimicrobial agent is effective at inhibiting the growth of the microbe in that area.

Differentiate between inhibition of growth and killing of bacteria: the Kirby-Bauer test shows inhibition (bacteriostatic effect), not necessarily killing (bactericidal effect).

Conclude that the zone of inhibition means the microbe does not grow in the presence of the antimicrobial agent, corresponding to option (a).

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Kirby-Bauer Susceptibility Test

The Kirby-Bauer test is a standardized method used to evaluate the effectiveness of antibiotics against bacteria. It involves placing antibiotic-impregnated disks on an agar plate inoculated with the test microbe. After incubation, zones of inhibition around disks indicate areas where bacterial growth is prevented.

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The Ames Test

Zone of Inhibition

A zone of inhibition is a clear area surrounding an antibiotic disk where bacterial growth has been halted. Its size reflects the susceptibility of the microbe to the antimicrobial agent; a larger zone generally means greater sensitivity, indicating the antibiotic effectively inhibits growth.

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Enzyme Inhibition

Antimicrobial Susceptibility vs. Resistance

Susceptibility means the microbe's growth is inhibited by the antimicrobial agent, while resistance means the microbe can grow despite the agent's presence. The Kirby-Bauer test helps distinguish between these by showing whether zones of inhibition form around antibiotic disks.

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Antimicrobial Peptides

Pratica correlata

Domanda del libro di testo

What specific test for antimicrobial efficacy is shown? What does this test measure? Draw an oval to predict the size and shape of the zone of inhibition if the drug concentration on the strip were increased twofold.

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Domanda del libro di testo

Label each of the accompanying figures to indicate the class of drug that is stopping polypeptide translation.

a. ________________ b. _________________

block initiation. change 30S subunit.

c. ________________ d. _________________

block ribosome attachment inhibits peptide bonding

e. ________________ g. _________________

f. ________________ h. _________________

block ribosome movement block tRNA docking