Antibiotic sensitivity testing

This photo shows a nutrient agar plate on which a culture of the bacterium E.coli has been spread, and a ring of paper disks (coloured) which have been impregnated with a variety of commonly used antibiotics, according to the codes below the picture.
Roll your mouse pointer over the image to see an explanation.
Antibiotic sensitivity test plate

PG Penicillin G
S Streptomycin*
T Tetracycline*
C Chloramphenicol*
E Erythromycin
FC Fucidic acid
MT Metronidazole
NO Novobiocin

It can be seen that only the 3 antibiotics marked * are effective against this bacterial strain, and that it is resistant to the others.
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