"Urea" Quotes from Famous Books
 ... carbon and hydrogen go to CO{2} and H{2}O, which are breathed out, while the silicone goes into SiO{2}, which is deposited as more teeth and armor. (Compare the terrestrial octopus, which makes armor-plating out of calcium urate instead of excreting urea or uric acid.) The animals can, of course, eat each other too, or make a meal of the small carbonaceous animals ...
— Uller Uprising • Henry Beam Piper, John D. Clark and John F. Carr
... a common store-house for the residues of the present and the plastic material of the future organic processes. Here something occurs analogous to what we see in the higher animals after the removal of the kidneys; the urea at first contained in the blood, in imperceptible quantities accumulates and becomes manifest when the means by which ...
— The Glow-Worm and Other Beetles • Jean Henri Fabre
... course, makes out a very clear case till he comes to the removal of the waste, or ash. The steam-engine cannot remove its own ash; the "living machine" can. Much of this ash takes the form of urea, and "the seizing upon the urea by the kidney cells is a vital phenomenon." Is not the peristaltic movement of the bowels, by which the solid matter is removed, also a vital phenomenon? Is not the conception of a pipe or a tube that forces semi-fluid matter along its hollow ...
— The Breath of Life • John Burroughs
... uttered by a speaker costs him some physical loss; and, in the strictest sense, he burns that others may have light—so much eloquence, so much of his body resolved into carbonic acid, water, and urea. It is clear that this process of expenditure cannot go on for ever. But, happily, the protoplasmic peau de chagrin differs from Balzac's in its capacity of being repaired, and brought back to its full size, after ...
— Autobiography and Selected Essays • Thomas Henry Huxley
... centre of holiday festivities. It is a public fountain, and its living streams of water make it one of the most appropriate and suggestive monuments in Europe. I would only suggest that they canonize the Little Man, and that the Parisians recognize a tutelar deity in the goddess Urea, who should have an appropriate monument somewhere in the ...
— Winter Sunshine • John Burroughs |
