Dental caries in relation to oral osmosis / by Ragnar Eckermann.

  • Eckermann, Ragnar.
Date:
1919
Catalogue details

Licence: Public Domain Mark

Credit: Dental caries in relation to oral osmosis / by Ragnar Eckermann. Source: Wellcome Collection.

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    the end; the contrary is true of grape-sugar (LAzARUS- BaRiow }). 12. Against a membrane impermeable to NaCl, the osmotic pressure of the blood is about twice as great as. against a membrane permeable to NaCl (because about half of the salts of human blood is NaCl). 13. About 1 per cent. salt solution and 10 per cent. cane sugar solution are both the average minimum for hypertonic effect upon the blood (cf. Chapter V). The relationship between’ the possibility of the formation and that of the formation and presence of a 10 per cent. sugar solution probably depends upon the age of the individual; the latter (sugar) is favourable in the young, the former (salt) in a more advanced age. 14. Salt-colloids (animal albumen and fat) seem to be rather tougher, more insoluble and stick faster to the teefh than sugar-colloids (sweets). (The opinion of the author, perhaps not correct.) 15. People who daily eat strongly salted food, but little(?) sugar, viz., the fisher- “population in Scandinavia, have very affected teeth. 16. The enzyme of the saliva, the diastase, is active only in presence of chlorides, especially NaCl (MicHaE Lis 2). 17. The osmotic strengthening of the saliva by addition of sugar is raised after 2 minutes, of salt after 4 minutes (s. Chapter V). 18. ‘he presence of common salt (like many other neutral salts) in so weak a proportion as 0.4 standard solution (= 2.34 per cent.) increases the reversible power of hydrochloric acid by 26 per cent., which means that the formation of organic acids and grape sugar is correspondingly increased, if HCl and NaCl are present. 17. Presence of sugar in the saliva set fermentation processes (S. among others MILLER %). 1 Lazarus-BarLow, The Journal of Physiology 19. 1895. 153. 2 MICHAELIS, 1913 p. 75. 3 MILLER, 1889 p. 39.