To understand the molecular interactions between N,N-dimethylformamide with two families of ionic liquids, the thermophysical properties such as densities and ultrasonic sound speeds have been measured over the entire composition range at 25 C under atmospheric pressure. The materials investigated in the present study include two families of ionic liquids, viz., ammonium salts and imidazolium s...

Bacillus subtilis uses glutamine as the best source of nitrogen. In the absence of glutamine, alternative nitrogen sources such as ammonium can be used. Ammonium utilization involves the uptake of the gas or the ammonium ion, the synthesis of glutamine by the glutamine synthetase and the recycling of the glutamate by the glutamate synthase. In this work, ammonium transport in B. subtilis was st...

1. Ammonium chloride is a poor uncoupler of photophosphorylation in subchloroplast particles. In the presence of valinomycin the inhibition of photophosphorylation by NH&l is greatly enhanced. 2. The enhancement of the ammonium chloride uncoupling of phosphorylation by valinomycin was less pronounced in chloroplasts than in subchloroplast particles. 3. The light-dependent uptake of ammonium ion...

This work studied simultaneous removal of ammonium and potassium ions by ion exchange with the natural zeolite clinoptilolite. Synthetic and real RO permeate used in experiments contained approximately 250 mg NH4/L and 200 mg K/L. The real RO permeate was obtained from membrane treatment of anaerobically digested cattle manure effluents. Batch experiments were conducted to determine ammonium an...

1. Ammonium chloride is a poor uncoupler of photophosphorylation in subchloroplast particles. In the presence of valinomycin the inhibition of photophosphorylation by NH&l is greatly enhanced. 2. The enhancement of the ammonium chloride uncoupling of phosphorylation by valinomycin was less pronounced in chloroplasts than in subchloroplast particles. 3. The light-dependent uptake of ammonium ion...

DMINISTRATION Of a fluoroacetate iS A known to bring about an inhibition of citrate oxidation, thus blocking the tricarboxylic acid cycle and resulting in the accumulation of citrate in various tissues in viva (I). Hence it is pertinent to inquire concerning the source or sources of the J-carbon precursors of the accumulating citrate. One obvious possibility is that an amino acid such as glutam...

In multiphase extraction [18F]fluoride ion for radiolabeling is recovered from target water by passage through a small column of microporous polymer impregnated with a lipophilic cryptand or quaternary ammonium salt. The 18O enriched water can be recovered for reuse. The [18F]fluoride ion-pair is eluted from the column by a small volume of acetonitrile or other organic solvent. Evaporation of t...

A systematic approach was used to evaluate the electrospray ionization mass spectral (ESI-MS) analysis of sucrose octasulfate (SOS), an important pharmaceutical agent. SOS represents a model for other suffated carbohydrates, such as heparin and glycosaminoglycan-derived oligosaccharides that also are highly sulfated and pose difficult analytical problems. A survey of ammonium counterions showed...

Membrane potential and permselectivity are critical parameters for a variety of electrochemically-driven separation and energy technologies. An electric potential is developed when a membrane separates electrolyte solutions of different concentrations, and a permselective membrane allows specific species to be transported while restricting the passage of other species. Ion exchange membranes ar...