References
Bekheet, I. A. & P. J. Syrett, 1977. Urea-degrading enzymes in algae. Br. phycol. J. 12: 137–143.
Bliss, G. I. & A. T. James, 1966. Fitting the rectangular hyperbola. Biometrics 22: 573–602.
Fishbein, W. N., T. S. Winter & J. D. Davidson, 1965. Urease catalysis, I. Stoichiometry, specificity, and kinetics of a second substrate: hydroxyurea.
Fishbein, W. N. & P. P. Carbone, 1965. Urease catalysis, II. Inhibition of the enzyme by hydroxyurea, hydroxylamine, and acetohydroxamic acid. J. biol. Chem. 240: 2407–2414.
Hartree, E. F., 1972. A modification of the Lowry method that gives a linear photometric response. Anal. Biochem. 48: 422–427.
Kobashi, K., J. Hase & K. Uehara, 1962. Specific inhibition of urease by hydroxamic acids. Biochem. Biophys. Acta 65: 380–383.
Kobashi, K., K. Kumaki & J. Hase, 1971. Effect of acyl residue of hydroxamic acids on urease inhibition. Biochem. Biophys. Acta 227: 429–441.
Leftley, J. W. & P. J. Syrett, 1973. Urease and ATP: Urea amidolyase activity in unicellular algae. J. gen. Microbiol. 77: 109–115.
Magana-Plaza, I., G. Montes & Ruiz-Herrera, 1971. Purification and biochemical characteristics of urease from Proteus rettgeri. Biochem. Biophys. Acta 242: 230–237.
Naylor, A. W., 1970. Phylogenetic aspects of nitrogen metabolism in the algae. Ann. N. Y. Acad. Sci. 175: 511–522.
Rognes, S. E., R. J. Roon & B. Levenberg, 1969. Separation and differential sensitivity toward avidin of carbamyl phosphate synthetase and urea amidolyase. FEBS Letters 3: 233–236.
Roon, R. J. & B. Levenberg, 1968. An adenosine triphosphatedependent avidin-sensitive enzymatic cleavage of urea in yeast and green algae. J. biol. Chem. 243: 5213–5215.
Smith, R. V. & R. H. Foy, 1974. Improved hydrogen ion buffering of media for the culture of freshwater algae. Br. phycol. J. 9: 239–245.
Syrett, P. J., 1962. Nitrogen assimilation. In R. A. Lewin (ed.), Physiology and Biochemistry of algae. Academic Press, New York: 171–188.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bekheet, I.A., Kandil, K.M. & Shahan, N.Z. Studies on urease extracted from Ulva lactuca . Hydrobiologia 116, 580–583 (1984). https://doi.org/10.1007/BF00027751
Issue Date:
DOI: https://doi.org/10.1007/BF00027751