PLANT METABOLISM 411 



12. Which groups of organisms can fix No? What is the key intermediate in the 

 fixation process? 



13. What differences can you cite in the respiration of plants and animals? What 

 similarities ? 



14. Why are plant growth substances often much supcMior to oils and acids as weed 

 killers? 



15. It is stated that growth substances arc responsible for i)hototropism and geo- 

 tropism. How can they cau.se such responses in plants? 



REFERENCES AND SUGGESTED READINGS 



Arnon, D. I., "Extracellular Photosynthetic Reactions," Nature, 167, 1008 (1951). 



Baeyer, Adolph, '•Concerning Dehydration and Its Significance for Plant Life and 

 Fermentation," Ber. dcut. chcm. Ges., 3, 63-75 (1870). 



Bernfeld, P., "Enzymes of Starch Degradation and Synthesis," Advances in Enzy- 

 mo/o^iy, 12, 379 (1951). 



Bonner, J., Plant Biochemistry , Academic Press Inc., New York, 1950. 



Burk, D., Cornfield, J., and Schwartz, M., "The Efficient Transformation of Light 

 into Chemical Energy in Photosynthesis," Sci. Monthly, 73, 213 (1951). 



Calvin, M., "The Path of Carbon in Photosynthesis, VI," J. Chem. Ed., 26, 639 

 (1949). 



Chibnall, A. C, Protein Metabolism in the Plant, Yale University Press, New Haven, 

 1939. 



Fischer, H., "Chlorophyll," Chem. Rev., 20, 41 (1937). 



Franck, J. and Loomis, W. E. (editors). Photosynthesis in Plants, Iowa State College 

 Press, Ames, 1949. 



Hassid, W. Z. and Doudoroff, M., "Synthesis of Disaccharides with Bacterial En- 

 zymes," Advances in Enzymology, 10, 123 (1950). 



Hill, R., "Oxidoreduction in Chloroplasts," Advances in Enzymology, 12, 1 (1951). 



Lardy. H. A. (editor). Respiratory Enzymes, Burgess Publishing Company, Minne- 

 apolis, 1949. 



Manning, W. M., Stauffer, J. F., Duggar, B. M., and Daniels, F., "Quantum Efficiency 

 of Photosynthesis in Chlorella," J. Am. Chem. Soc, 60, 266 (1938). 



Rabinowitch, E. I., Photosyyithesis and Related Processes, Interscience Publishers 

 Inc., New York, Vol. I (1945) Vol. II, part 1 (1951). 



Skoog, F. (editor), Plant Growth Substances, University of Wisconsin Press, Madi- 

 son, 1951. 



Tolmach, L. J., "Effects of Triphosphopyridine Nucleotide upon Oxygen Evolution 

 and Carbon Dioxide Fixation by Illuminated Chloroplasts," Nature, 167, 946 

 (1951). 



Truog, E. (editor), Mineral Nutntion oj Plants, University of Wisconsin Press, 

 Madison, 1951. 



Tswett, M., "Adsorption Analysis and the Chromatographic Method. Application 

 to the Chemistry of the Chlorophylls," Ber. dent, botan. Ges., 24, 384-393 (1906). 



van Niel, C. B., "On the Morphology and Physiology of the Purple and Green Sulfur 

 Bacteria," Arch. Mikrobiologie, 3, 1 (1931). 



Vishniac, W. and Ochoa, S., "Photochemical Reduction of Pyridine Nucleotides by 

 Spinach Grana and Coupled Carbon Dioxide Fixation," Nature, 167, 768 (1951). 



Warburg, 0. and Burk, D., "The Maximum Efficiency of Photosynthesis," Arch. 

 Biochem., 25, 410 (1950). 



