Title: Biophysical science
Identifier: biophysicalscien00acke (find matches)
Year: 1962 (1960s)
Authors: Ackerman, Eugene, 1920-
Subjects: Biophysics
Publisher: Englewood Cliffs, N. J. , Prentice-Hall
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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20 : 4/ Photosynthesis 369 in that it is exothermic, liberating energy and apparently going even in the absence of any specific enzyme. Reduced pyridine nucleotide is used to convert 3-phospho-glyceric acid to 3-phosphoglyceraldehyde. Carboxydismutase System
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Epimerase H2CO® Xylulose - 5-P Sucrose and Starch Figure 4. Some of the steps in photosynthesis. (P) stands for phosphate in the diagram and P for phosphate in the names. Note that all compounds with five or more carbons are sugars and probably exist primarily in a ring isomer; straight-chain formulas are for convenience only. After J. A. Bassham and M. Calvin, The Path of Carbon in Photosynthesis (Englewood Cliffs, N.J.: Prentice-Hall, Inc., 1957). ATP is used at this step and in the formation of the ribulose-l,5-diphos- phate. Although the scheme shown in Figures 4 and 5 may seem extremely complex, all evidence indicates that it is an oversimplification. None- theless, the general cyclic character and the need for reduced pyridine nucleotide (PNH) and ATP seem established beyond question. The

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