(1977) Aspects of ammoniogenesis in rainbow trout, Salmo gairdneri.

Plant metabolism of ammonia Ammonia is toxic in plants and cannot be excreted.

Figure 1 is a flowsheet of the first commercial ammonia plant

Metabolic transformation Ammonia is taken up by glutamic acid in many tissues, and this will take part in a variety of transamination and other reactions, the nitrogen being incorporated in non-essential amino acids.

Ammonium increases the permeability of the cell membrane causing plasmolysis and necrosis.

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Atmospheric ammonia undergoes four main types of reaction, namely aqueous-phase reactions, thermal reactions, photochemical reactions, and heterogeneous reactions.

Other plant parts are more resistant to ammonia injury than the foliage.

As described in a paper published in The Plant Cell on December 20, 2013, Liu's team—including postdoctoral research associates Xuebin Zhang and Mingyue Gou—explored an unconventional approach to achieve this goal. The conventional approach takes aim at the regulation of genes that instruct plant cells to make enzymes involved in phenol production. These enzymes are proteins that serve as catalysts to speed up the chemical reactions that synthesize phenols. Instead of trying to regulate how these enzymes are produced, Liu's group looked at how the enzymes might be manipulated after production to control their ability to make plant phenols.

Uptake and Metabolism in Plants Ammonia is used by many plants and preferentially by a few.

The first high-pressure ammonia plant went on stream in 1913

Plants Ammonia may affect vegetation directly by acting on plant structure and function, and, indirectly, via its influence on soil condition after being deposited.

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Bacterial decomposition of excreta collected and stored beneath slotted floors in enclosed buildings produces a number of gases, including ammonia, carbon dioxide, hydrogen sulfide, and methane (Curtis, 1972).

Many other steps take place in an ammonia synthesis plant

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.

Ammonia - Essential Chemical Industry

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).

Future Ammonia Technologies: Plasmas, Membranes, …

In general, the ammonia content was below the admissible upper limit during the summer months but exceeded it during the winter months, when extremely high concentrations were observed.

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In broad-leaved woody plants exposed to high concentrations of ammonia, the injury begins as large, dark green water-soaked areas on leaves, which darken into black or brownish-gray bifacial necrotic lesions, widely distributed over the leaf surface.