Siliceous Urinary Calculi

Urinary calculi.

IJANTITATIVE CHEMICAL ANALYSES of urinary calculi have been done in these laboratories for some twenty years. During this time almost two thousand stones have been examined. In the early days of this period, the only quantitative method available was that of a complete analysis of the inorganic ions and organic compounds present, which was quite difficult and tedious. After the development of t...

Exhibition of Urinary Calculi

The Etiology Of Urinary Calculi

Urinary Calculi in Germfree Rats

In a colony of germfree rats 50 per cent of the males had urinary calculi composed of calcium citrate and calcium oxalate. Genetically closely related conventional animals on the same sterilized diet did not present a single case of stone formation. The tendency to calculus formation disappeared when germfree animals were contaminated with the intestinal flora from conventional rats. The calcul...

Urinary calculi in Limbang District.

THE causes and mechanisms of urolithiasis are even nowadays not well understood. An increased concentration of crystalloids in urine as happens, for· example, in dehydration is one of the factors frequently cited. Randall (1937) drew attention to the importance of urinary tract infections as an initiating factor, and proposed that some stones started off as a plaque-like precipitate on the muco...