86 CONTROL MECHANISMS IN CELLULAR PROCESSES 



Udaj:a, S., and S. Kinoshita. 1958. Studies on L-ornithine fermentation. II. The 

 change of fermentation product by a feedback type mechanism. /. Gen. Appl. 

 Microbiol. 4: 283-288. 



Umbarger, H. E. 1955. In Amino Acid Metabolism, eds. W. D. McElroy and 

 H. B. Glass. Johns Hopkins Press, Baltimore. 



Umbarger, H. E. 1956. Exidence for a negatixe feedback mechanism in the bio- 

 synthesis of isoleucine. Scieiwe 123: 848. 



Umbarger, H. E. 1958. a-Hydroxy-a-ethyl-^-ketobutyrate, the initial six-carbon 

 precursor of isoleucine in Escherichia coli. Bacteriol. Proc. p. 111. 



Umbarger, H. E., and B. Brown. 1957. Threonine deamination in Escherichia coli. 

 II. Evidence for two L-threonine deaminases. /. Bacteriol. 73: 105-112. 



Umbarger, H. E., and B. Brown. 1958a. Isoleucine and vahne metabohsm in 

 Escherichia coli. VII. A negati\e feedback mechanism controlling isoleucine 

 biosynthesis. /. Biol. Chem. 233: 41.5-420. 



Umbarger, H. E., and B. Brown. 1958b. Isoleucine and valine metabolism in 

 Escherichia coli. VII. The fonnation of acetolactate. /. Biol Chein. 233: 1156- 

 1160. 



Umbarger, H. E., B. Brown, and E. J. Eyring. 1957. Acetolactate, an early inter- 

 mediate in valine biosynthesis. /. Am. Chem. Soc. 79: 2980. 



VoGEL, H. J. 1956. In The Chemical Basis of Heredity, eds. W. D. McElroy and 

 H. B. Glass. Johns Hopkins Press, Baltimore. 



VoGEL, H. J. 1961. Control by repression. This book. Chap. 2. 



VoGEL, H. J., and B. D. Davis. 1952. Adaptive phenomena in a biosynthetic path- 

 way. Fed. Proc. 11: 485. 



WijESUNDERA, S., and D. D. Woods. 1953. The effect of growth on a medium con- 

 taining methionine on the synthesis of this amino acid by Bacterium coli. Biochem. 

 J. 55: viii. 



WijESUNDERA, S., and D. D. Woods. 1960. Suppression of methionine synthesis in 

 Escherichia coli by growth in the presence of this amino acid. /. Gen. Microbiol. 

 22: 229-241. 



Wood, W. A., and I. C. Gunsalus. 1949. Serine and threonine deaminases of 

 Escherichia coli: activators for a cell-free enzyme. /. Biol. Chem. 181: 171-182. 



WoRMSER, E. H., and A. B. Pardee. 1958. Regulation of threonine biosynthesis in 

 Escherichia coli. Arch. Biochem. Biopijhs. 78: 416-432. 



Wyngaarden, J. B., and D. M. Ashton. 1959. The regulation of acti\ity of phos- 

 phoribosylpyrophosphate amidotransferase by purine ribonucleotides: a potential 

 feedback control of purine biosynthesis. /. Biol. Chem. 234: 1492-1496. 



Yates, R. A., and A. B. Pardee. 1956. Control of pyrimidine biosynthesis in 

 Escherichia coli. bv a feedback mechanism. /. Biol. Chem. 221: 757-770. 



