Quantitative laws in biological chemistry / by Svante Arrhenius.

  • Arrhenius, Svante, 1859-1927.
Date:
1915
Catalogue details

Licence: In copyright

Credit: Quantitative laws in biological chemistry / by Svante Arrhenius. Source: Wellcome Collection.

    62/184 (page 46)
    Coagulation of Milk by Rennet, 36-55° C. t (minutes). g- qt. t (minutes). g- qt. 4 8 32 50 •5 25 6 5 30 70 •4 28 9 3-3 30 80 •32 26 12 1-9 23 IOO .28 28 20 i*3 26 120 •25 30 30 •7 2 I I 80 • 185 33 35 •7 25 24O • 167 40 The same rule is valid for the digestion of gelatine by a substance produced by Bacillus pyocyaneus. By its action the gelatine is liquefied. The time of liquefaction t is inversely proportional to the quantity q of pyocyaneus ferment used. The figures given in the following table, borrowed from Madsen and Walbum, give a proof of the y/-law. Digestion of Thymol-gelatine by Means of Pyocyaneus Culture at 34-5° C. t (hours). g• qt. t (hours). g• qt. 0-5 i-6 •80 8 • 11 -88 1 • 8 -SO 10 .09 .90 2 .46 -92 12 • 08 .96 3 j .90 16-5 •06 •99 4 • 22 -88 18 •044 •79 4-5 . 2 ■ 90 20 •042 .84 6 .165 •99 25 •035 -88 The saponification of fats by the steapsin from the pancreatic juice is another example of the