Word: filter
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...lactic acid. Due to such acid content of sweat, athletes often complain of "stinging sweat." Because excess salt is shed through the skin, the body cannot supply normal amounts to the stomach, where in the form of hydrochloric acid it is needed for digestion. Nor can the kidneys filter from the blood an adequate amount of salt for the urine. As a result the urine is painfully alkaline...
Chlamydozoa are so small that they filter through the pores of unglazed porcelain. Filterable likewise, and invisible by means of the most potent microscopes yet invented, are 25 other substances which are known to cause specific diseases (infantile paralysis, common cold, mumps) and 21 substances which are presumed to cause in man scarlet fever, trachoma, encephalitis, influenza, measles, German measles, multiple sclerosis, psoriasis, venereal warts...
...Peter Franzman's quarrel with the world is convincingly done, the scenes of passion compelling and beautiful. Here the author's technique becomes suddenly apparent in one paragraph. Peter's life is like a series of vividly coloured bits of film in his own mind. His memory is the filter through which every new emotion is perceived. Friesen's book is a series of magnificently complete little pictures, strung together on the thread of a man's life, unified by the filter which is unobtrusively transposed on the running film...
While this was going on, assistants poured the pitcher of blood through a filter made of several layers of gauze. By the time that a tumblerful of his own blood had been pumped back into his body, the boy recovered consciousness...
Only one pitch, however, is admitted at a time. The sounds of each frequency or pitch are admitted through the filter for a small fraction of a second and deflect a spot of light, generated by a cathodes ray tube, along a horizontal line in proportion to their strength. The sport, moving back and forth as higher and higher pitched sounds with different intensities are admitted, is photographed on sensitized paper and leaves a line graph. This graph is a picture record of the noise, showing the relative loudness of each of its component parts...