Phase transition of ammonium polyphosphate ..

Estimated atmospheric emissions of ammonia in the USA and the Netherlands--------------------------------------------------Source Annual emission (103 tonnes NH3) ---------------------- USAa the Netherlandsb--------------------------------------------------animal manure 3400 114 (1)fertilizer volatilization 285 6.1 - 10.6industrial activities 1111 7.6other sources 0.8 0.5--------------------------------------------------a From: US EPA (1981).

Synergistic effects of ammonium polyphosphate/melamine intumescent system with macromolecular ...
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In soil, major sources of ammonia are the aerobic degradation of organic matter and the application and atmospheric deposition of synthetic fertilizers.

Ammonium polyphosphate, water-soluble - supplier …

Influence of ammonium polyphosphate modified with 3‐(methylacryloxyl) propyltrimethoxy ...
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Among two genes of polyphosphate kinases present in Mycobacterium tuberculosis, we cloned and expressed PPK1 in Escherichia coli as histidine-tagged protein. This ~86 kDa protein is capable of autophosphorylation and synthesis of poly-P as well as NTP. Among 22 conserved histidine residues, we found only His-491 is autophosphorylated and crucial for any enzymatic activity. Substitution of His-510 caused mPPK1 protein deficient but not defective in autophosphorylation, thereby contrary to earlier reports negating any role of this residue in the process. However, mutation of His-510 with either Ala or Gln affected ATP or poly-P synthesis depending on the substitution; while such effects were severe with H510A but mild with H510Q. Furthermore, mPPK1 also renders auxiliary nucleotide diphosphate kinase function by synthesizing virtually all NTPs/dNTPs from their cognate NDPs/dNDPs by utilizing poly-P as the phosphate donor albeit with varied efficiency. To assess the influence of other catalytic domain residues of mPPK1 towards its functionality, we designed mutations based on E. coli PPK1 crystal structure since it owes 68% amino acid sequence similarity with mPPK1. Interestingly, our results revealed that mutations in mPPK1 affecting poly-P synthesis always affected its ATP synthesizing ability; however, the reverse may not be true.

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It was reported by Byerrum & Benson (1975) that added ammonium ion at concentrations found to stimulate the photosynthetic rate also caused the alga Amphidinium carterae to release up to 60% of fixed 14CO2 to the medium.

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Ammonium ions may restrict photosynthesis through the uncoupling of noncyclic photophosphorylation in isolated chloroplasts (Gibbs & Calo, 1959; Losada & Arnon, 1963), though the mechanism of action is not known (Losada et al., 1973).

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Ammonia treatment has also been reported to activate phosphorylation of thymidine and synthesis of histones in unfertilized eggs of the sea urchin, S.

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This use of ammonia in the synthesis of organic molecules can be regarded as a process for storing a valuable nutrient, but is also an important detoxifying mechanism.

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Webb & Brown (1976) found high glutamine synthetase (EC activity in the brains of teleosts and elasmobranchs, and this may be important in protecting the brain from sudden surges in ammonia concentration.