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: In this paper, the authors explored the performance of a pilot scale high-solids anaerobic digestion process under various total ammonia nitrogen (TAN) concentrations and found that the digester performed best when it was operated at TAN concentrations in the narrow range of 600 to 800 mg dm -3.
Abstract: Ammonia is produced during anaerobic digestion of protein-containing materials. While ammonia can be utilized by some members of the anaerobic population, excess ammonia can inhibit methanogenesis. High-solids anaerobic digestion may be especially sensitive to the effects of ammonia overproduction. This study explored the performance of a pilot scale high-solids anaerobic digestion process under various total ammonia nitrogen (TAN) concentrations. In general the high-solids digester could operate up to 1000 mg dm -3 without any inhibitory effect. The digester performed best when it was operated at TAN concentrations in the narrow range of 600 to 800 mg dm -3
175 citations
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TL;DR: The gas phase equilibria and those leading to mixed clusters like were measured with a pulsed electron beam high pressure ion source mass spectrometer as mentioned in this paper, where the ion source contained pure ammonia or mixtur...
Abstract: The gas phase equilibriaand those leading to mixed clusters likewere measured with a pulsed electron beam high pressure ion source mass spectrometer. The ion source contained pure ammonia or mixtur...
175 citations
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27 Sep 2000
TL;DR: In this paper, a single-stage process was described for the preparation of primary aliphatic polyamines of the formula in which R 1 and R 2 independently of one another are hydrogen, methyl, ethyl or aminomethyl, by reaction of polyalcohols on a Co/Ni catalyst with supercritical ammonia.
Abstract: A single-stage process is described for the preparation of primary aliphatic polyamines of the formula in which R 1 and R 2 independently of one another are hydrogen, methyl, ethyl or aminomethyl, by reaction of polyalcohols on a Co/Ni catalyst with supercritical ammonia in the presence of hydrogen.
174 citations
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TL;DR: Investigation of behavioural responses of Aedes aegypti mosquitoes to ammonia suggests that ammonia is part of the effective principle of fraction II and contributes to the attractive effect of host odours.
Abstract: Behavioural responses of Aedes aegypti mosquitoes to ammonia were investigated in a modified Y-tube olfactometer. Ammonia was attractive in concentrations from 17 ppb to 17 ppm in air when presented together with lactic acid. Aqueous solutions of ammonia salts in concentrations comparable to those found in human sweat also increased the attractiveness of lactic acid. The role of lactic acid as an essential synergist for ammonia became further apparent by the fact that ammonia alone or in combination with carbon dioxide was not effective, even though the synergistic effect of carbon dioxide and lactic acid was corroborated. An extract from human skin residues, which attracts approximately 80% of the tested mosquitoes, contains both lactic acid and ammonia. The combination of these compounds, however, attracts no more than 45%, indicating that other components on human skin also play a role in host finding. Preparative liquid chromatography of the skin extract yielded three behaviourally active fractions which work together synergistically. Fraction III contains lactic acid as the effective principle; the compositions of the other two have not been clarified yet. The attractiveness of fraction I was augmented considerably when ammonia was added, whereas the effect of fraction II was not influenced by ammonia. These results suggests that ammonia is part of the effective principle of fraction II and contributes to the attractive effect of host odours.
174 citations
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TL;DR: The data suggest that both the rate of of energy production and the rates of generation of reducing equivalents from endogensou substrates are insufficient to meet the requirements for optimal rates of urea synthesis.
174 citations