The patterns of molybdenum (MoO42-) absorption and transport were investigated in intact bean ( Phaseolus vulgars L.) Several studies have been made in the past years relating to the mechanisms of absorption and transport of major nutrients and also some micronutrient elements (5, 12). However, information on the mechanisms of micronutrient absorption is still inadequate, and Moore (13) has rightly emphasized the need for a systematic investigation to understand the manner in which the micronutrients, especially boron and molybdenum, are absorbed by plant systems and also the factors which control their absorption and transport. Molybdate absorption and transport have been studied in intact plants and excised roots, and the results are reported here.
MATERIALS AND METHODS
The synthesis of zircon from ZrO2 and SiO2 at fixed temperatures from 1200° to 1400°C was studied as a function of time up to 16 h. Quantitative X‐ray diffraction was used to estimate the phases in the product. Quartz transforms to cristobalite through an amorphous transitional phase. Assuming a homogeneous reaction model, analog computer simulation of reactions was used to determine the rate constants at different temperatures. In the temperature range studied, the transitional phase is the most reactive form of silica in zircon synthesis, followed by cristobalite.
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