Investigating antibiotics & antiseptics (Edexcel GCSE Biology Combined Science): Flashcards
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What do inhibition zones compare?
What do inhibition zones compare?
Effectiveness of antibiotics/antiseptics/plant extracts
Formula for inhibition zone area
Formula for inhibition zone area
Value of to use
Value of to use
3.14
What to measure in inhibition zone
What to measure in inhibition zone
Diameter
How to find radius from diameter
How to find radius from diameter
Divide diameter by 2
Example: radius if diameter = 10 mm
Example: radius if diameter = 10 mm
5 mm (10 ÷ 2)
Calculate area: , mm
Calculate area: , mm
mm²
Larger inhibition zone means
Larger inhibition zone means
More bacteria killed
What does a larger inhibition zone indicate?
What does a larger inhibition zone indicate?
More effective antibiotic (more bacteria killed)
How to quantify antibiotic effectiveness
How to quantify antibiotic effectiveness
Calculate area of inhibition zone using