• Belton, P. S., Lee, R. B. & Ratcliffe, R. G. (1985). A 15N nuclear magnetic resonance study of inorganic nitrogen metabolism in barley, maize and pea roots. Journal of Experimental Botany, 36 (163), 190210.
  • Berger, M. G., Sprengart, M. L., Kusnan, M. & Fock, H. P. (1986). Ammonia fixation via glutamine synthetase and glutamate synthase in the CAM plant Cissus quadrangularis L. Plant Physiology, 81, 356360.
  • Cammaerts, D. & Jacobs, M. (1985). A study of the role of glutamate dehydrogenase in the nitrogen metabolism of Arabidopsis thaliana. Planta, 163, 517526.
  • Cleland, C. F. & Briggs, W. K. (1968). Effect of low intensity red and far red light and high intensity white light on the flowering response of the long day plant L. gibba G-3. Plant Physiology, 43, 153162.
  • Folkes, B. F. & Yemm, E. W. (1958). The respiration of barley plants. X. Respiration and the metabolism of amino acids and proteins in germinating grain. New Phytologist, 57, 106131.
  • Lea, P. J. & Miflin, B. B. (1974). An alternative route for nitrogen assimilation in higher plants. Nature, 251, 614616.
  • Lea, P. J. (1982). The assimilation of ammonia. In: Techniques in Bioproductivity Photosynthesis (Ed. By J.Coombs & D. O.Hall), pp. 130141. Pergamon, Oxford .
  • Loughman, B. C. & Ratcliffe, R. G. (1984). Nuclear magnetic resonance and the study of plants. In: Advances in Plant Nutrition, vol. 1 (Ed. by A.Lauchi & P. B.Tinker), pp. 241283. Praeger, New York .
  • Martin, F. (1985). 15N-NMR studies of nitrogen assimilation and amino acid biosynthesis in the ectomycorrizal fungus Cenococcum graniforme. FEBS Letters, 182, 350354.
  • Martin, F., Stewart, G. R., Genetet, I. & Letacon, F. (1986). Assimilation of 18NH4+ by Beech (Fagus sylvatica L.) ectomycorrhizas. New Phytologist, 102, 8594.
  • Miflin, B. J. & Lea, P. J. (1980). Ammonia assimilation. In: The Biochemistry of Plants, vol. 5 (Ed. By B. J.Miflin), pp. 169202. Academic Press, New York .
  • Moor, G. R., Ratcliffe, R. G. & Williams, R. J. P. (1983). NMR and the biochemist. Essays in Biochemistry, 19, 142195.
  • Porath, D., Efrat, Y. & Arzee, T. (1980). Morphological patterns and heterogeneity in populations of duckweeds. Aquatic Botany, 9, 159168.
  • Quetz, P. C, Tischner, T. & Lorenzen, H. (1982). Changes in the activity of enzymes involved in nitrogen metabolism in maize seedlings dependent on different nitrogen sources. Biochemie und Physiologic der Pflanzen, 177, 567576.
  • Rand, H. C, Greenberg, A. E. & Tarns, M. J. (1975). Standard Methods for the Examination of Water and Waste water, 14th Edn, pp. 412415. American Public Health Association, Washington D.C.
  • Rhodes, D., Sims, A. P. & Folkes, B. F. (1980). Pathway of ammonia assimilation in illuminated Lemna minor. Phytochemistry, 19, 357363.
  • Singh, R. P. & Srivastava, H. S. (1982). Glutamate dehydrogenase activity and assimilation of inorganic nitrogen in maize seedlings. Biochemie und Physiologic der Pflanzen, 177, 633642.
  • Stewart, G. R. & Rhodes, D. (1976). Evidence for the assimilation of ammonia via the glutamine pathway in nitrate-grown Lemna minor L. FEBS Letters, 46, 340342.
  • Stewart, G. R. & Rhodes, D. (1977). Control of enzyme levels in the regulation of nitrogen assimilation. In: Regulation of Enzyme Synthesis and Activity (Ed. by H.Smith). London , Academic Press.
  • Woo, K. C. & Osmond, C. B. (1982). Stimulation of ammonia 2–oxo-glutarate-dependent O2 evolution in isolated chloroplasts by dicarboxylate and the role of the chloroplasts in photorespiratory nitrogen recycling. Plant Physiology, 69, 591596.