120 Perspectives in Microbiology 



7. Lipman, J. G. The associative growth of legumes and non- 

 legumes. New Jersey Agr. Expt. Sta. Bull, No. 253, 1912. 



8. Newton, J. W., Wilson, P. W., and Burris, R. H. Direct demon- 

 stration of ammonia as an intermediate in nitrogen fixation by 

 azotobacter. /. Biol. Chem., 204:445-451, 1953. 



9. Pine, M. J., and Barker, H. A. Fixation of atmospheric nitrogen 

 by Methanobacterium omeliansky . J . Bad. (in press). 



10. Rosenblum, E. D., and Wilson, P. W. Molecular hydrogen and 

 nitrogen fixation by Clostridium. /. Bad., 59:83-91, 1950. 



11. Shug, A. L., Wilson, P. W., Green, D. E., and Mahler, H. The 

 role of molybdenum and flavin in hydrogenase. /. Am. Chem. 

 Soc, 76:3355, 1954. 



12. Sisler, F. D., and Zobell, C. E. Nitrogen fixation by sulfate-reduc- 

 ing bacteria indicated by nitrogen/argon ratios. Science, 113:511- 

 512, 1951. 



13. Virtanen, A. I. Cattle Fodder and Human Nutrition. Cambridge 

 University Press, Cambridge, England, 1938. 



14. Virtanen, A. I. Mechanism of symbiotic nitrogen fixation by 

 leguminous plants. Trans. Third Cofnm. Intern. Soc. Soil Sci., 

 A:4-19, 1939. 



15. Wilson, P. W. The Biochemistry of Symbiotic Nitrogen Fixation. 

 University of Wisconsin Press, Madison, 1940. 



16. Wilson, P. W. Biological nitrogen fixation. In Bacterial Physi- 

 ology, edited by Werkman, C. H., and Wilson, P. W. Academic 

 Press, New York, 1951, pp. 467-499. 



17. Wilson, P. W. The comparative biochemistry of nitrogen fixation. 

 Advances in EnzymoL, 13:345-375, 1952. 



18. Wilson, P. W., and Burris, R. H. Biological nitrogen fixation: 

 a reappraisal. Ann. Rev. Microbiol., 7:415-432, 1953. 



19. Wilson, P. W., and Wyss, O. Discussion of paper by Dr. A. I. 

 Virtanen. Trans. Third Comm. Intern. Soc. Soil Sci., B: 13-18, 

 1939. 



20. Wyss, O., and Wilson, P. W. Inhibition of azotobacter by hydro- 

 gen. Proc. Natl. Acad. Sci. U. S., 27:162-168, 1941. 



21. Zelitch, I., Rosenblum, E. D., Burris, R. H., and Wilson, P. W. 

 Isolation of the key intermediate in biological nitrogen fixation 

 by Clostridium. J. Biol. Chem., 191:295-298, 1951. 



