نتایج جستجو برای: ammonium ion

تعداد نتایج: 227565  

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2010
Takashi Shoji Eiko Nakamura

In order to determine ammonium ion in water samples, we propose a method based on the Berthelot reaction of ammonia with 1-naphthol and dichloroisocyanurate to form an indophenol blue derivative and collection of the blue compound as an ion pair using Zephiramine on a pure polytetrafluoroethylene (PTFE)-type membrane filter. The ion pair on the filter was eluted with 5.0 mL of acetonitrile, and...

Journal: :Clinical chemistry 1961
A G FAULKNER E C KNOBLOCK W C PURDY

Polarographicdata are presented for the reduction of selenite ion in 3M sulfuric acid, 1M potassium chloride, and 1M ammonia-ammonium chloride. In these first two media two waves are obtained correspondingto the diffusion-controlled reduction of selenite ion to selenium amalgam and the adsorption of selenite ion on the mercury drop, respectively. One wave is obtained in ammonia-ammonium chlorid...

Journal: :Journal of bacteriology 1975
R J Roon F Larimore J S Levy

The rate of transport of L-amino acids by Saccharomyces cerevisiae epsilon 1278b increased with time in response to nitrogen starvation. This increase could be prevented by the addition of ammonium sulfate or cycloheximide. A slow time-dependent loss of transport activity was observed when ammonium sulfate (or ammonium sulfate plus cycloheximide) was added to cells after 3 h of nitrogen starvat...

Journal: :Journal of chromatographic science 2003
Louis H Bluhm Tingyu Li

The choice of analogue ion of the mobile phase additive is shown to significantly affect the analysis of quaternary ammonium compounds (QACs) in ion-pair reversed-phase high-performance liquid chromatography. A series of bromide-containing and dodecyl-sulfate-containing mobile phase additives are investigated using two QAC probe analytes. In all instances, the quaternary-ammonium-containing mob...

Journal: :Journal of bacteriology 1982
L Kang M L Keeler P C Dunlop R J Roon

The biosynthesis of asparaginase II in Saccharomyces cerevisiae is subject to nitrogen catabolite repression. In the present study we examined the physiological effects of glutamate auxotrophy on cellular metabolism and on the nitrogen catabolite repression of asparaginase II. Glutamate auxotrophic cells, incubated without a glutamate supplement, had a diminished internal pool of alpha-ketoglut...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1391

in this thesis protic and aprotic ammonium-based ionic liquids were synthesized and their surface tensions were measured in the range of 298-373k. the protics are alkyl ammonium-based ils with the carboxylate (formate, acetate, propionate) anion and aprotics are quaternary ammonium-based ils with bis(trifluoromethylsulfonyl)imide anion. capillary rise method was used for surface tension measure...

1999
R. Goc

The p-T phase diagram [2, 3] for this compound is given in Figure 1. Generally, different models of motion of the ammonium ions are proposed for different phases, and many research papers deal with this problem. Numerous papers [4 10] were devoted to NMR T j relaxation time calculations for different types of anisotropic reorientations of the ammonium cation. An extensive review of ammonium ion...

Journal: :Antimicrobial agents and chemotherapy 1980
S Omura Y Tanaka C Kitao H Tanaka Y Iwai

Addition of magnesium phosphate [Mg3(PO4)2 x 8H2O] to a complex medium or to an ammonium ion-containing, chemically defined medium stimulated leucomycin production by Streptomyces kitasatoensis. Ammonium ions in high concentrations inhibited leucomycin production, but their limitation by magnesium phosphate led to the high production of the antibiotic.

2013
Shivani Gupta Dinesh Singh Rana

Ammonium Nitrate (AN) prilling Process is nonlinear and non stationary in nature. Due to uncertainty created by nonlinear conditions like temperature rise due to exothermic reaction in the neutraliser, level in the evaporator, velocity of the cooling air in prilling tower, temperature and moisture content of prills and size of the prills. Due to these difficulties the degree of automation is qu...

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