CONTENTS 



XV 



SECTION VIII.— THE COLLOIDAL STATE 



Suspensoids .... 



General properties . 

 Optical properties 

 Electrical properties 

 Protective action of colloids . 

 Emulsoids .... 



Genera] properties . 

 Swelling of colloids or imbibition 

 Gel formation 



General properties of gels 



Nature of gels 



Adsorption 

 Colloidal electrolytes 

 Enzyme action of colloids 

 Colloidal nature of protoplasm 



SECTION IX.— PROTEINS 



animal proteins 



d their ph 



ysiological signifi 



Extraction .... 

 Classification 



Comparison between vegetable and 

 Physical and chemical properties 

 Physical properties 



Solubilities of proteins an 



cance . 

 Iso-electric points 

 Chemical properties 



Microchemical reactions 

 Decomposition products 



Amino acids obtained as cleavage products of proteins 

 Occurrence of amino acids in plants 

 Synthesis of amino acids in the plant 

 A note on the chemical composition of protoplasm 



SECTION X.— ENZYMES . 



Classification 

 Isolation and purification 

 Chemical constitution . 

 Mode of action 

 Conditioning factors 

 Temperature . 

 Reaction of medium 



Concentration of enzyme and of substrate 

 Influence of end products 

 Paralysers ..... 



Radiation ..... 



Reversibility of enzyme action 

 Antienzymes ..... 



A consideration of selected enzymes 



Lipase ...... 



Preparation .... 



Properties .... 



Diastase (Amylase) 

 Isolation 



Quantitative determination of activity 

 Takadiastase . 

 Maltase 



Preparation 



Proteolytic enzymes 



Occurrence 



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