By N.C. Brady (Ed.)
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Rev. Plant Physiol. 20, 495-522. Biscoe, P. V. 1972. 1. Exp. Bot. 23, 930-940. Boyer, J. S . 1968. Plant Physiol. 43, 1056-1062. Boyer, J. S. 1969. Annu. Rev. Plant Physiol. 20, 351-364. Boyer, J. S. 1970a. Plant Physiol. 46, 233-235. Boyer, J. S . 1970b. Plant Physiol. 46, 236-239. Boyer, J. S . 1971a. Plant Physiol. 47, 816-820. Boyer, J. S . 1971b. Plant Physiol. 48, 532-536. Boyer, J. S . 1973. Phytopathology 63, 466472. Boyer, J. , and Bowen, B. L. 1970. Plant Physiol. 45, 612-615. Brevedan, E.
17. Oxidation of Glucose Ross ( 1968) found slight amounts of gluconic and 2-ketogluconic acids in reaction mixtures prepared from soils and glucose solution when incubated for a maximum of 16 hours at 37OC. In reaction mixtures containing toluene, the acids were also detectable even after 24-28 hours of incubation and their amounts were larger than in the absence of toluene. These results suggest the occurrence of glucose oxidase and gluconate dehydrogenase as accumulated enzymes in soil. Utilization of glucose, however, by glucose oxidase and gluconate dehydrogenase is of minor importance.
In addition, in irradiated soil ureolysis was faster than in native soil. Microbial proliferation occurred in the absence of toluene and, concomitantly, urease could be synthesized, but the amount of synthesized urease was negligible in comparison with the amount of accumulated urease. Increase of urease activity following treatment with toluene or electron beam can be attributed to an increase of permeability for urea and reaction products in the viable microbial cells, which became nonproliferating in the presence of toluene, to the increase of permeability in radiation-killed cells, and also to the lytic effect of toluene on some microorganisms and to the autolysis of the radiation-killed cells.