Topic
Ammonia
About: Ammonia is a research topic. Over the lifetime, 16217 publications have been published within this topic receiving 271940 citations. The topic is also known as: NH3 & azane.
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TL;DR: Combined gastrointestinal and renal responses exert a synergistic effect on improved utilization of urea of plasma when uptake of dietary nitrogen is limited in goats and other ruminants.
232 citations
TL;DR: The voltage dependence of the affinity of LeAMT1;1 toward its substrate strongly suggests that charged NH 4 + , rather than NH3, is the true transport substrate, and ammonium transport was independent of the external proton concentration between pH 5.5 and pH 8.5.
232 citations
TL;DR: In this article, aqueous ammonia solution for the simultaneous reduction of acidic gaseous emission from fossil fuel-fired utility plants is applied at the National Energy Technology Laboratory (NEL).
Abstract: Experimental research work in applying aqueous ammonia solution for the simultaneous reduction of acidic gaseous emission from fossil fuel-fired utility plants is currently being performed at the National Energy Technology Laboratory. The traditional monoethanolamine process for CO2 removal suffers the disadvantages of low carbon dioxide loading capacity, equipment corrosion, amine degradation by SO2 and O2 in flue gas, and high energy penalty during absorbent regeneration. The aqueous ammonia process can simultaneously remove CO2, SO2, NOx, plus HCl and HF that may exist in the flue gas. There could be oxidation of SO2 and NO prior to contacting the aqueous ammonia absorbent. Test results pertaining to the ammonia/carbon dioxide reaction in a semi-continuous reactor system are presented. The parametric effects of sparger design, reaction temperature, and ammonia concentration on gas loadings and absorption rates are discussed. Regeneration test results, including solution-cycling between the regeneration and absorption steps to determine a realistic loading capacity for the ammonia solutions are also presented.
232 citations
TL;DR: The environmental factors that affected the accumulation of nitrite in nitrifying reactors were investigated using a mixed culture using a batch reactor with 50 mg-N/l of ammonia and as much as 77% of the removed ammonia accumulated in nitrite.
Abstract: The environmental factors that affected the accumulation of nitrite in nitrifying reactors were investigated using a mixed culture A batch reactor with 50 mg-N/l of ammonia was used The pH, temperature and dissolved oxygen concentration were varied The concentration of unionized free ammonia also changed with the oxidation of ammonia and the variation of pH and temperature The accumulation of nitrite was affected sensitively by pH and temperature A higher nitrite concentration was observed at pH 8-9 or temperature around 30 °C The dissolved oxygen also affected, giving the highest nitrite accumulation at around 15 mg/l These were the favoredconditions for nitrite production The free ammonia concentration influenced thenitrite accumulation also, by inhibiting nitrite oxidation The inhibition becameapparent at a concentration of approximately 4 mg/l or above, but insignificant atbelow 1 mg/l Thus, simultaneously high free ammonia concentration and maximumspecific ammonia-oxidation rate (above 15 × 10-3 mg-N/mg-VSSċh)were needed for a significant nitrite accumulation When the two conditions were met, thenthe highest accumulation was observed when the ratio of the maximum specific oxidationrate of ammonia to the maximum specific oxidation rate of nitrite (ka/kn) was highestUnder the optimal operating conditions of pH 8, 30 °C and 15 mg/l of dissolvedoxygen, as much as 77% of the removed ammonia accumulated in nitrite
232 citations
TL;DR: The assimilation of inorganic N, in the form of ammonia, onto C skeletons for the production of amino acids is one of the most important biochemical processes in plants.
Abstract: The assimilation of inorganic N, in the form of ammonia, onto C skeletons for the production of amino acids is one of the most important biochemical processes in plants. In an actively growing plant, N is taken up as nitrate and to a lesser extent as ammonia. Nitrate is reduced in the cytoplasm by
231 citations