The distribution of the Mo-enzymes aldehyde oxidase (AO; EC 1.2.3.1) xanthine dehydrogenase (XDH; EC 1.2.1.37) and nitrate reductase (NAD(P)H NR; EC 1.6.6.1-2) was studied along the longitudinal and transversal axes of maize (Zea mays L. cv. Jubily) nodal roots as affected by nitrogen sources and
The in vivo activity of xanthine dehydrogenase (E.C. 1.2.1.37) was followed in leaf discs excised from illuminated or darkened plants. In cotyledons of Pharbitis nil, 24 hours of darkness enhanced the in vivo activity of xanthine dehydrogenase which increased between 2 to 5-fold depending on the
The activities of nitrite reductase (EC 1.7.7.1) are 60-70% of wild-type activity in pigment-deficient leaves of the chloroplast-ribosomedeficient mutants 'albostrians' (Hordeum vulgare) and 'iojap' (Zea mays). The activity and apoprotein of nitrate reductase (EC 1.6.6.1.) are lacking in the barley
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