1915] 



DAVIS — ENZYME ACTION IN MARINE ALGAE 



799 



acted upon, although perhaps a little more slowly. This action 

 is definitely progressive with starch, dextrin, and laminarin, 

 but with glycogen it takes a sudden jump during the 15-45- 

 day period, then remains practically stationary for the rest 

 of the time the series is being maintained. As was true of the 

 results shown in the previous tables, this carbohydrate was 

 less favorable as a substrate than any of the other polysac- 

 charides employed. 



r J TABLE VII 



THE ACTION OF A "DIFFUSION-EXTRACT" FROM AIR-DRIED RHODYMENIA 



TISSUE UPON VARIOUS CARBOHYDRATES 



Substrate 



Sugar as glucose in 5 cc. 



mgms. 





15 days 



45 days 



75 days 



100 days 



Starch 



9.2 



8.25 



Trace 

 4.7 



• m 4 m 



• 4 4 4 



• a • 4 



• • • • 



12.2 

 9.7 

 6.1 

 7.3 



• •44 



Trace 



1 * • • 

 4 4 4 4 



14.8 



10.3 



6.4 



9.6 



Trace 



Trace 



4 4 4 4 



Trace 



18.2 



Dextrin 



11.1 



Glycogen 



6.7 



Laminarin 



^r 9 W 



10.5 



Inulin 



Trace 



Sucrose 



Trace 



Lactose 



-» m n+~^ ^#* ^*-* 



Trace 



Maltose 



^fc a ^* ^^ ^^ 



Trace 













THE CARBOHYDRASES OF AGARDHIELLA TENERA 



The very succulent nature of the freshly collected material 

 compelled its partial dehydration immediately. Two 15- 

 minute treatments with 95 per cent alcohol were used, then 

 the tissue spread out on paper toweling to dry at room tem- 

 perature. After drying, it was very easily powdered without 

 the aid of quartz sand. The alcohol precipitate from a water 

 extract of this powder was quite fine and flocculent, differing 

 much from that of Rhodymenia, both in amount and in nature. 



TABLE VIII 



THE ACTION OF A "DIFFUSION-EXTRACT" FROM DEHYDRATED AGARDHIELLA 



TISSUE UPON CERTAIN CARBOHYDRATES 



Substrate 



Sugar as glucose in 5 cc. 



mgms. 





15 days 



6.35 

 7.00 

 2.35 

 5.8 



m m 4 4 



Trace 



* • 4 4 



# • « • 



45 days 



75 days 



100 days 



Starch 



9.4 



10.5 

 6.15 

 8.3 

 Trace 

 Trace 



ft 1 I • 

 4 4 4 4 



14.5 

 15.95 

 6.65 

 11.6 

 Trace 

 Trace 



• •44 



Trace 



20.9 



Dextrin 



19.7 



Glycogen 



6.85 



Laminarin 



Inulin 



Sucrose 



13.2 



Trace 



Trace 



Lactose 



Trace 



Maltose 



^fc * ^^ ^^ ^mW 



Trace 













