(9). Hydroponic studies using several species, including soybeans (1, 13) and navy beans (17), suggested that high nutrient Zn did interfere with Fe uptake and/ or translocation, resulting in manifestations of Fe deficiency. The addition of Fe to the growth medium of soybeans could overcome the effects of high nutrient Zn, suggesting a competition between Zn and Fe at some site (1).Examination of competition between Zn -and Fe necessitates separate analysis of the absorption of metals by the roots and translocation to the leaves, using carefully controlled nutrient conditions. This report describes a hydroponic study designed to determine possible mechanisms of Zn toxicity at the level of these transport processes. The effect of Zn on Chl was also studied.
MATERIALS AND METHODS
We present four new fast radio bursts discovered in a search of the Parkes 70-cm pulsar survey data archive for dispersed single pulses and bursts. We searched dispersion measures (DMs) ranging between 0 to 5000 pc cm−3 with the HEIMDALL and FETCH detection and classification algorithms. All four of the FRBs discovered have significantly larger widths (>50 ms) than almost all of the FRBs detected and cataloged to date. The large pulse widths are not dominated by interstellar scattering or dispersive smearing within channels. One of the FRBs has a DM of 3338 pc cm3, the largest measured for any FRB to date. These are also the first FRBs detected by any radio telescope so far, predating the Lorimer Burst by almost a decade. Our results suggest that pulsar survey archives remain important sources of previously undetected FRBs and that searches for FRBs on time scales extending beyond ∼100 ms may reveal the presence of a larger population of wide-pulse FRBs.
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