Two types of ammonium uranyl nitrate (NH4)2UO2(NO3)4·2H2O and NH4UO2(NO3)3, were thermally decomposed and reduced in a TG-DTA unit in nitrogen, air, and hydrogen atmospheres. Various intermediate phases produced by the thermal decomposition and reduction process were investigated by an X-ray diffraction analysis and a TG/DTA analysis. Both (NH4)2UO2(NO3)4·2H2O and NH4UO2(NO3)3 decomposed to amo...

A year-long field study to characterize the ionic species in PM2.5 was carried out in Shanghai and Beijing, China, in 1999–2000. Weekly samples of PM2.5 were collected using a special low flow rate (0.4 lmin ) sampler. In Shanghai, SO4 2 NO3 and NH4 + were the dominant ionic species, which accounted for 46%, 18% and 17% of the total mass of ions, respectively. Local SO2 emissions were an import...

In this study we characterized ammonia and ammonium (NH3/NH4(+)) transport by the rhesus-associated (Rh) glycoproteins RhAG, Rhbg, and Rhcg expressed in Xenopus oocytes. We used ion-selective microelectrodes and two-electrode voltage clamp to measure changes in intracellular pH, surface pH, and whole cell currents induced by NH3/NH4(+) and methyl amine/ammonium (MA/MA(+)). These measurements al...

The use of an endemic plant as rootstock has many merits but its application for cucurbits production not been extensively investigated. present study determined the growth responses grafted cucumber using two rootstocks from Cucurbita pepo L. fertilized with different ratios nitrate (NO3-): ammonium (NH4+) fertilizer. A greenhouse was carried out (C. sativus ‘Dominos’) on accessions collected ...

The objective of this study was to evaluate the treatment efficiency of a gravel contact oxidation treatment system which was newly constructed under the riverbed of Nan-men Stream located at the Shin Chu City of Taiwan. The influent and effluent water samples were taken periodically for the analyses of pH, temperature, dissolved oxygen, total suspended solids, five-day biological oxygen demand...

The addition of a small amount of NH4+ to a complex medium increased nanaomycin production by Streptomyces rosa subsp. notoensis OS-3966. The best NH4+ donor for nanaomycin production was NH4+-saturated natural zeolite, with which the maximum titer of nanaomycin E was 760 micrograms/ml, about four fold higher than the control titer. In contrast, lowering NH4+ levels by adding NH4+-trapping agen...

the effects of different concentrations of cdcl2 and alcl3 on nh4+ and no2? oxidation in an aqueous system were investigated. alcl3 had no effect on nh4+ removal and its oxidation to no2?, whereas no2? disappearance was greatly enhanced by alcl3. in contrast, cdcl2 delayed removal of nh4+ and its subsequent oxidation to no2? and also decreased the rate of no2? disappearance. when compared to th...

EXTENDED ABSTRACT For nitrogen rich streams, conventional biological treatment based on nitrification and denitrification usually lacks of efficiency and requires considerable amounts of an external carbon source to be supplied; on the other hand, physical-chemical processes are characterized by high operating costs. The possible application of partial nitritation SHARON (Single reactor for Hig...

The effect of (NH4)2SO4:Ca(NO3)2 ratios applied by fertigation on nutritional status, fruit set, yield, and marketable yield pomegranate trees cv. Wonderful was evaluated. were provided with five nutrient solutions the same total nitrogen level (200 units/ha) but different (100:0, 90:10, 80:20, 70:30, 60:40). Increasing (NH4)2SO4 ratio from 60 to 100% significantly reduced (N), magnesium (Mg), ...