220 CARBOHYDRATE-SPLITTING FERMENTS 



Thus it has been noticed that diastases are at least partly 

 inactivated by prolonged dialysis and may be reactivated by 

 the addition of certain salts 87 ; that the blood serum contains 

 a substance which is resistive to boiling and is soluble in 

 alcohol, which apparently augments the diastases 88 ; that 

 hydrolysis of starch is strengthened by alternating currents 

 of low intensity 89 ; that there is a hydrolyzing influence in 

 the ultra-violet rays of a mercury quartz lamp, 90 etc. For 

 the most part, however, these matters fall within the sphere 

 of physical-chemistry; and are beyond the limitations set 

 for these lectures. 



87 H. Bierry and J. Giaja, C. R. Soc. de Biol., 60, 749, 1131, 1906; 62, 432, 

 1907; C. R., 143, 300, 1906; L. Preti, Biochem. Zeitschr., 4, 1, 1909; I. Bang, 

 ibid., 32, 417, 1911. 



88 J. Wohlgemuth, Biochem. Zeitschr., S3, 303, 1911. 



89 A. Lebedew (Moscow), Biochem. Zeitschr., 9, 392, 1908. 

 90 H. Bierry, V. Henri and A. Ranc, Jour, de Physiol., IS, 700, 1911; 

 L. Massol, C. R M 152, 902, ]911 ; J. Giaja, C. R. Soc. de Biol., 72, 2, 1912. 



