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7 ) ] . This reaction is mediated by the enzyme phosphoribulokinase (Hurwitz et al, 1956). 4. 003%. Since P G A is a product of the carboxylation reaction, it was expected that its concentration would fall. This is exactly what happened. A t the same time, the concentration of ribulose diphosphate rose rapidly and then fell. This behavior is to be expected if ribulose diphosphate is a substrate for the carboxylation reaction, since lowering the C 0 pressure will stop the reaction which uses up RuDP.

The separation and identification of the minute amounts of radioactive organic compounds formed by photosynthesis with C 0 was a difficult analytical problem. , 1950). In this method, after the plant has photosynthesized organic compounds from C 0 , it is killed and the soluble compounds are extracted with such solvents as alcohol and water. Then one removes the excess solvent by 1 4 2 1 4 2 PHOTOSYNTHESIS 33 evaporation and dries the concentrated extracts on a large sheet of filter paper near the corner.

Transketolase catalyzes a reaction [Eq. ( 1 9 ) ] between thiamine pyrophosphate and sedoheptulose-7-phosphate to produce thiamine pyrophosphate-glycolaldehyde and a five-carbon compound, ribose-5-phosphate ( X I ) , labeled in carbon atoms 1, 2, and 3. Phosphoribose isomerase (Axelrod and Jang, 1954) converts this compound to ribulose-5-phosphate ( I ) [Eq. ( 2 0 ) ] . The two molecules of thiamine pyrophosphate-glycolaldehyde produced by Eq. ( 1 6 ) and ( 1 9 ) could react with any of the aldose monophosphates mentioned so far.

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