The title compound, ammonium potassium iron(III) phosphate fluoride, (NH(4))(0.875)K(0.125)FePO(4)F, is built from zigzag chains (∞) (1){[FeO(4)F(2)](7-)}, with Fe(3+) in a distorted octahedral coordination, extending along both the [011] and [01] directions. These chains are made up of alternating trans-[FeO(4)F(2)] and cis-[FeO(4)F(2)] octa-hedra via shared F-atom corners, and are linked by P...

Activities and properties of the ammonium assimilation enzymes NADP+-dependent glutamate dehydrogenase (GDH), glutamate synthase (GOGAT) and glutamine synthetase (GS) were determined in batch and continuous cultures of Candida albicans. NADP+-dependent GDH activity showed allosteric kinetics, with an S0.5 for 2-oxoglutarate of 7.5 mM and an apparent Km for ammonium of 5.0 mM. GOGAT activity was...

Instream processing may substantially alter nutrient export from forested watersheds. This study tested how instream uptake of N and P were affected by successional differences in the accumulation of large wood and debris dams in a 66-year chronosequence formed by five watersheds within the Hubbard Brook Experimental Forest (HBEF), NH. Nutrient enrichment releases in summer 1998 were used to me...

7-Aminocephalosporanic acid wastewater usually contains high concentrations of ammonium (NH₄⁺-N), which is known to inhibit nitrification during biological treatment processes. Chemical precipitation is a useful technology to remove ammonium from wastewater. In this paper, the removal of ammonium from 7-aminocephalosporanic acid wastewater was studied. The optimum pH, molar ratio, and various c...

Materials-The pigeon liver extract preparation and the substrates required for the synthesis of glycinamide ribotide have been described previously (l-4). Intestinal phosphatase, purified grade, was obtained from Pentex, Inc., Kankakee, Illinois. Adenosine-5’-phosphate was obtained from the Ernst Bischoff Company, Inc., Ivoryton, Connecticut. Adenosine-3’-phosphate was obtained from the Schwarz...

Treated wastewater discharged from more than 400 onsite wastewater treatment systems (OWTS) near the Civic Center area of Malibu, California, 40 km west of downtown Los Angeles, composes 28% of the recharge to a 3.4 km(2) alluvial aquifer. On the basis of δ(18) O and δD data, the fraction of wastewater in some samples was >70%. Ammonium and nitrate concentrations in water from 15 water-table we...

Chemical fertilizers are used extensively in modern agriculture, in order to improve yield and productivity of agricultural products. However, nutrient leaching from agricultural soil into groundwater resources poses a major environmental and public health concern. The Evros region is one of the largest agricultural areas in Northern Greece, extending over 1.5 million acres of cultivated land. ...

Adenylosuccinate synthetase has been purified more than 250-fold from extracts of rabbit muscle acetone powder by heating to 60”, ammonium sulfate fractionation, phosphocellulose and hydroxylapatite chromatography, and Sephadex G-150 gel filtration. Crystals have been obtained by dialysis against 60 to 67% ammonium sulfate. Enzyme activity is stable for about 2 weeks in phosphate buffer contain...

Materials-The pigeon liver extract preparation and the substrates required for the synthesis of glycinamide ribotide have been described previously (l-4). Intestinal phosphatase, purified grade, was obtained from Pentex, Inc., Kankakee, Illinois. Adenosine-5’-phosphate was obtained from the Ernst Bischoff Company, Inc., Ivoryton, Connecticut. Adenosine-3’-phosphate was obtained from the Schwarz...

This study focuses on the cell growth and the neutral lipid production modeling of Chlamydomonas reinhardtii in terms of different ammonium concentrations. Autotrophy was maintained during growth in a double walled bioreactor, using Tris Phosphate (TP medium) with only CO(2) and NH(4)Cl as sole sources of carbon and nitrogen, respectively. Nitrogen depletion results in an increase in neutral li...