Figure 15. — Carbon- 14 labeled wheat plants, growing in the biosynthesis chamber. 



LITERATURE CITED 



(1) Andersen, A., Nielsen, G., and Sorensen, H. 



1961. growth chamber for labeling plant ma- 

 terial uniformly with radiocarbon. 

 Plant Physiol. 14 (2) : 378-383. 



(2) Brown, J. C, Tiffin, L. O., and Holmes, R. S. 



1958. carbohydrate and organic actd metabolism 

 WITH C-14 distribution affected by copper 

 in thatcher wheat. Plant Physiol. 33 (1) : 

 38-42. 



(3) Fisher, A. C, Jr. 



1958. YOU AND THE OBEDIENT ATOM. Natl. GeOg. 



Mag. 114 (3) : 303-353. 



(4) Jenkinson, D. S. 



1960. THE PRODUCTION OF RYEGRASS LABELED WITH 



CARBON-14. Plant and Soil 13 (3) : 279- 

 290. 



(5) McMurtrey, J. B., Jr. 



1933. DISTINCTIVE EFFECTS OF THE DEFICIENCY OF 

 CERTAIN ESSENTIAL ELEMENTS ON THE GROWTH 

 OF TOBACCO PLANTS IN SOLUTION CULTURES. 



U.S. Dept. of Agr. Tech. Bui. 340, 42 pp., 

 illus. 



(6) Sauerbeck, D. von. 



1960. zur markierung von pflanzen mit 14 c 

 Atompraxis 6. Jahrgang, Heft 6. 



(7) Scully, N. J., and others. 



1956. biosynthesis in c-14 labeled plants; 

 agricultural and biological research. In- 

 ternatl. Conf. Peaceful Uses of Atomic 

 Energy Proc. 12: 377-385. United Nations, 

 New York. 



(8) Steinberg, R. A. 



1951. influence of acidity, calcium and mag- 

 nesium ON GROWTH OF XANTHI TOBACCO IN 



water-culture. Plant Physiol. 26 (1) : 37- 

 44. 



% 



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U.S. GOVERNMENT PRINTING OFFICE : 1962 O 645779 



