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Title: THE PATH OF CARBON IN PHOTOSYNTHESIS

Abstract

Biosynthesis begins with photosynthesis. Green plants and other photosynthetic organisms use the energy of absorbed visible light to make organic compounds from inorganic compounds. These organic compounds are the starting point for all other biosynthetic pathways. The products of photosynthesis provide not only the substrate material but also chemical energy for all subsequent biosynthesis. For example, nonphotosynthetic organisms making fats from sugars would first break down the sugars to smaller organic molecules. Some of the smaller molecules might be oxidized with O{sub 2} to CO{sub 2} and water. These reactions are accompanied by a release of chemical energy because O{sub 2} and sugar have a high chemical potential energy towards conversion to CO{sub 2} and H{sub 2}O. In a biochemical system only part of this energy would be released as heat. The heat would be used to bring about the conversion of certain enzymic cofactors to their more energetic forms. These cofactors would then enter into specific enzymic reactions in such a way as to supply energy to drive reactions in the direction of fat synthesis. Fats would be formed from the small organic molecules resulting from the breakdown of sugars. Thus sugar, a photosynthetic product, can supply both themore » energy and the material for the biosynthesis of fats.« less

Authors:
;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USAEC
OSTI Identifier:
928508
Report Number(s):
UCRL-9583
TRN: US200812%%429
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 09 BIOMASS FUELS; BIOSYNTHESIS; PLANTS; CARBON; ORGANIC COMPOUNDS; PHOTOSYNTHESIS; FATS; SACCHAROSE; BIOCHEMICAL REACTION KINETICS

Citation Formats

Bassham, J.A., and Calvin, Melvin. THE PATH OF CARBON IN PHOTOSYNTHESIS. United States: N. p., 1960. Web. doi:10.2172/928508.
Bassham, J.A., & Calvin, Melvin. THE PATH OF CARBON IN PHOTOSYNTHESIS. United States. doi:10.2172/928508.
Bassham, J.A., and Calvin, Melvin. Sat . "THE PATH OF CARBON IN PHOTOSYNTHESIS". United States. doi:10.2172/928508. https://www.osti.gov/servlets/purl/928508.
@article{osti_928508,
title = {THE PATH OF CARBON IN PHOTOSYNTHESIS},
author = {Bassham, J.A. and Calvin, Melvin},
abstractNote = {Biosynthesis begins with photosynthesis. Green plants and other photosynthetic organisms use the energy of absorbed visible light to make organic compounds from inorganic compounds. These organic compounds are the starting point for all other biosynthetic pathways. The products of photosynthesis provide not only the substrate material but also chemical energy for all subsequent biosynthesis. For example, nonphotosynthetic organisms making fats from sugars would first break down the sugars to smaller organic molecules. Some of the smaller molecules might be oxidized with O{sub 2} to CO{sub 2} and water. These reactions are accompanied by a release of chemical energy because O{sub 2} and sugar have a high chemical potential energy towards conversion to CO{sub 2} and H{sub 2}O. In a biochemical system only part of this energy would be released as heat. The heat would be used to bring about the conversion of certain enzymic cofactors to their more energetic forms. These cofactors would then enter into specific enzymic reactions in such a way as to supply energy to drive reactions in the direction of fat synthesis. Fats would be formed from the small organic molecules resulting from the breakdown of sugars. Thus sugar, a photosynthetic product, can supply both the energy and the material for the biosynthesis of fats.},
doi = {10.2172/928508},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1960},
month = {Sat Oct 01 00:00:00 EDT 1960}
}

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