The storage and handling of animal wastes is one of the main sources of ammonia gas emissions. Ammonia gas has a distinct, unpleasant odor and can become detrimental to the health of humans and animals at high concentrations. Ammonia emissions are of particular concern in manure drying systems, where large losses of nitrogen, in the form of ammonia can cause air quality concerns. The aim of thi...

Ammonia losses during swine wastewater treatment were examined using single- and two-chambered microbial fuel cells (MFCs). Ammonia removal was 60% over 5 days for a single-chamber MFC with the cathode exposed to air (air-cathode), versus 69% over 13 days from the anode chamber in a two-chamber MFC with a ferricyanide catholyte. In both types of systems, ammonia losses were accelerated with ele...

Dry matter intake, nitrogen intake, nitrogen digestibility, rumen ammonia-N and plasma urea-N concentration were measured in young rusa deer fed 4 diets containing 90 to 205 g/kg DM crude protein. The level of crude protein associated with maximal voluntary food intake and dry matter digestibility for these animals was found to be about 160 g/kg DM. Plasma urea-N was positively related to rumen...

Nitrogen (N) appears to be a limiting dietary resource for elasmobranchs, required not only for protein growth but also for urea-based osmoregulation. Building on recent evidence that the toxicant ammonia can be taken up actively at the gills of the shark and made into the valuable osmolyte urea, we demonstrate that the uptake exhibits classic Michaelis-Menten saturation kinetics with an affini...

In the paper, control possibilities for the nitrogen removal process within activated sludge wastewater treatment plants are discussed. A predictive controller is introduced which aims to reduce the peaks in effluent concentration for ammonia nitrogen. Additionally, the controller improves the overall nitrogen removal using less aeration energy. A parsimonious deterministic model is used for th...

In a contribution to this Research Topic Erkki Somersalo and Daniela Calvetti carried out a mathematical analysis of neurotransmitter pathways in brain, modeling compartmental nitrogen flux among several major participants - ammonia, glutamine, glutamate, GABA, and selected amino acids. This analysis is important because cerebral nitrogen metabolism is perturbed in many diseases, including live...

, The nitrogen of the three above sources of nitrogen is not available to the plant until it has been converted to ammonia, the nitrites or nitrates. In sugarcane probably the most important of the above three compounds is the nitrate nitrogen form. When added to the soil in a commercial fertilizer, nitrate nitrogen, if applied in fairly large quantities, under certain conditions can also be th...

Theoretical investigations of electrochemical production of ammonia at ambient temperature and pressure on nitrogen covered molybdenum nanoparticles are presented. Density functional theory calculations are used in combination with the computational hydrogen electrode approach to calculate the free energy profile for electrochemical protonation of N2 and N adatoms on cuboctahedral Mo13 nanopart...

The discovery three years ago of thefirst well-defined complex compound containing the nitrogen molecule a complex of ruthenium aroused great interest in such compounds and in their relation to nitrogen fixation. Since then a number of other nitrogen complexes have been obtained, but as yet, despite reports to the contrary, attempts to reduce their nitrogen to ammonia have been unsuccessful. In...

The inhibiting effect of nitrogen compounds on the hydrogenation of aromatic compounds and on the hydrodesulphurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6 DMDBT), has been systematically investigated over a commercial NiMo hydrotreating catalyst. Amongst the different nitrogen compounds considered, interestingly ammonia was found to have the strongest inhibit...