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A sugar, isomeric with lactose, that is the true inducer of the lac operon.
References in classic literature ?
With the problem of the universe revolving in me, how could I--being left completely to myself at such a thought-engendering altitude, --how could I but lightly hold my obligations to observe all whale-ships' standing orders, Keep your weather eye open, and sing out every time.
From their arrow-slit in the skull, the priests perceived me taking the altitude of the final rib.
I could see myself rise a foot at a time in Marco's estimation, and when I fetched out those last words I was become a very tower for style and altitude.
He had asked the landlady the altitude of her place above the level of the lake, and she told him fourteen hundred and ninety-five feet.
The altitude of the gallows that would turn to water and quench it, no functionary, by any stretch of mathematics, was able to calculate successfully.
He first took my altitude by a quadrant, and then, with a rule and compasses, described the dimensions and outlines of my whole body, all which he entered upon paper; and in six days brought my clothes very ill made, and quite out of shape, by happening to mistake a figure in the calculation.
But we must have already emerged and gone seven hundred or eight hundred leagues; and if I had here an astrolabe to take the altitude of the pole, I could tell thee how many we have travelled, though either I know little, or we have already crossed or shall shortly cross the equinoctial line which parts the two opposite poles midway.
Presently a great city showed below me, but it was not Helium, as that alone of all Barsoomian metropolises consists in two immense circular walled cities about seventy-five miles apart and would have been easily distinguishable from the altitude at which I was flying.
Some are known to you, such as the thermometer, which gives the internal temperature of the Nautilus; the barometer, which indicates the weight of the air and foretells the changes of the weather; the hygrometer, which marks the dryness of the atmosphere; the storm-glass, the contents of which, by decomposing, announce the approach of tempests; the compass, which guides my course; the sextant, which shows the latitude by the altitude of the sun; chronometers, by which I calculate the longitude; and glasses for day and night, which I use to examine the points of the horizon, when the Nautilus rises to the surface of the waves.
It is conjectured by some that the whole country may originally have been of the altitude of these tabular hills; but through some process of nature may have sunk to its present level; these insulated eminences being protected by broad foundations of solid rock.
Madame, from that evening, achieved and enjoyed a success capable of bewildering all not born to those altitudes termed thrones; which, in spite of their elevation, are sheltered from such giddiness.
Though some of these rise to the region of perpetual snows, and are upwards of eleven thousand feet in real altitude, yet their height from their immediate basis is not so great as might be imagined, as they swell up from elevated plains, several thousand feet above the level of the ocean.