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:
“... it is not the color of the skin that makes the man or the woman, but the principle formed in the soul. Brilliant wit will shine, come from whence it will; and genius and talent will not hide the brightness of its lustre.”
—Maria Stewart (1803–1879)
“If there be one principle more deeply rooted than any other in the mind of every American, it is that we should have nothing to do with conquest.”
—Thomas Jefferson (1743–1826)
“There is a good principle which created order, light, and man, and an evil principle which created chaos, darkness, and woman.”
—Pythagoras (c. 572–497 B.C.)