Principle
The Etest is basically an agar diffusion method.
The Etest utilises a rectangular strip that has been impregnated with the drug to be studied. A lawn of bacteria is spread and grown on an agar plate, and the Etest strip is laid on top; the drug diffuses out into the agar, producing an exponential gradient of the drug to be tested. There is an exponential scale printed on the strip. After 24 hours of incubation, an elliptical zone of inhibition is produced and the point at which the ellipse meets the strip gives a reading for the minimum inhibitory concentration (MIC) of the drug.
Read more about this topic: Epsilometer Test
Famous quotes containing the word principle:
“The principle of the brotherhood of man is ... narcissistic ... for the grounds for that love have always been the assumption that we ought to realize that we are the same the whole world over.”
—Germaine Greer (b. 1939)
“The monk in hiding himself from the world becomes not less than himself, not less of a person, but more of a person, more truly and perfectly himself: for his personality and individuality are perfected in their true order, the spiritual, interior order, of union with God, the principle of all perfection.”
—Thomas Merton (1915–1968)
“The sons of Judah have to choose that God may again choose them.... The divine principle of our race is action, choice, resolved memory.”
—George Eliot [Mary Ann (or Marian)