352 



BACTERIOLOGICAL CHEMISTRY 



pentoses or glycerol it produces the same liiteic acid, 

 together with the other products, as it does when grown 

 on glucose. Some moulds produce polysaccharides 

 which are built up of more than one carbohydrate unit. 

 Thus P. chadesii gives a polysaccharide containing 

 glucose and galactose as well as a second polysaccharide, 

 mannocarolose, [a]587o+66°, which consists of eight or 

 nine units of f?-mannose linked together through the 

 1 : 6 230sitions : — 



CHaOH 



P. varians gives rise to an even more complex poly- 

 saccharide, varianose, [a]D+15°, which on hydrolysis 

 yields three sugars, galactose, glucose and either d-idose 

 or Z-altrose, in the proportions 6:1:1. They are linked 

 together with the glucose molecule at one end and the 

 galactose units in the middle : — 



CH 



I 

 CHjjOH 



(glucose) 



l-CHOH 

 CHOH 



(P-galactoae; 



((Mdose or /-altrose) 



