نتایج جستجو برای: ammonium

تعداد نتایج: 25274  

Journal: :Propellants, Explosives, Pyrotechnics 2023

Fine porous ammonium perchlorate (PAP) has small holes in its crust, and the voids particles are connected to outside. The porosity of PAP results fine bubble contamination a propellant because cannot be completely charged with binder. can improve burning rate characteristics an (AP) propellant. influence on nitrate (AN)/AP effect Fe2O3 as catalyst them were investigated this study. void fracti...

نجفی , نصرت اله , پارسازاده, منصور,

In order to study the effect of nitrogen form and pH of nutrient solution on the shoot concentration of P, nitrate, organic N + inorganic ammonium, and total N of spinach, a factorial experiment was conducted with two factors including pH of nutrient solution in three levels (4.5, 6.5 and 8.0) and nitrate to ammonium ratio of nutrient solution in five levels (100:0, 75:25, 50:50, 25:75 and 0:10...

2014
Sakineh Haddadi GholamReza Nabi-Bidhendi Nasser Mehrdadi

Vulnerability of water resources to nutrients led to progressively stricter standards for wastewater effluents. Modification of the conventional procedures to meet the new standards is inevitable. New technologies should give a priority to nitrogen removal. In this paper, ammonium chloride and urine as nitrogen sources were used to investigate the capacity of a microbial electrolysis cell (MEC)...

2017
Ahmad Merhi Paul Delrée Anna Maria Marini

Two structurally and functionally distinct mammalian TOR complexes control cell growth and metabolism in physiological and pathological contexts including cancer. Upregulated glutaminolysis is part of the metabolic reprogramming occurring in cancer, providing fuels for growth but also liberating ammonium, a potent neurotoxic waste product. Here, we identify ammonium as a novel dose-dependent si...

2001
I. Koyuncu D. Topacik M. Turan M. S. Celik H. Z. Sarikaya

Amnonium ion is effectively removed by Reverse Osmosis membranes (Brackish water, BW; Saline water, SW). The removal efficiency of ammonium ion from a solution containing ammonium ion which is not complexed is varying in the range of 5–60%. On the contrary, ammonium ion forms complexes with other ions in water and wastewater removal efficiency was as high as 99% for the synthetic solution which...

Journal: :Journal of experimental botany 2004
Dominique Loqué Nicolaus von Wirén

Ammonium is an attractive nitrogen form for root uptake due to its permanent availability and the reduced state of the nitrogen. On the other hand, ammonium fluxes are difficult to control because ammonium represents an equilibrium between NH4+ and NH3, which are two N forms with different membrane permeabilities. There is increasing evidence that AMT-type ammonium transporters represent the ma...

2013
Yuanyuan Bu Bo Sun Aimin Zhou Xinxin Zhang Imshik Lee Shenkui Liu

Nitrogen is one of the most important limiting factors for plant growth. However, as ammonium is readily converted into ammonia (NH3) when soil pH rises above 8.0, this activity depletes the availability of ammonium (NH4(+)) in alkaline soils, consequently preventing the growth of most plant species. The perennial wild grass Puccinellia tenuiflora is one of a few plants able to grow in soils wi...

Journal: :Plant physiology 1966
A V Barker R J Volk W A Jackson

Previous experiments have revealed a much greater efficiency of ammonium utilization by bean plants (Phaseolus vulgaris L.) when the acidity of the ambient medium was maintained at near-neutral conditions with carbonates or hydroxides. The present investigation, in which (15)N-labeled ammonium was used, permitted an assessment of the origin of nitrogen in tissue nitrogen pools with and without ...

Journal: :International journal of radiation oncology, biology, physics 1995
I Constantinidis M P Gamcsik

PURPOSE Previous studies from our laboratory have suggested that pooling of ammonium in tumor tissues may be caused by its inefficient removal due to the poor vasculature commonly found in tumors. The purpose of these experiments was to validate the relationship between tumor ammonium ion concentration and tumor blood flow, and to determine whether large concentrations of ammonium ion detected ...

2000
James M. Lightstone Timothy B. Onasch Dan Imre Susan Oatis

We have investigated the thermodynamics and kinetics of ammonium nitrate/water and mixed ammonium nitrate/succinic acid/water microparticles. The water activity of ammonium nitrate microparticles is determined as a function of composition down to 12% relative humidity by accounting for the rapid evaporation of ammonia and nitric acid. Both the observed deliquescence and water activities for amm...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید