, 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...

Tomato plants, Lycopersicon esculentum L. cv. Tmknvf(2), and watermelon plants, Citrullus lanatus [Thomb.] Mansf. cv. Dulce maravilla, were grown for 30 days at different temperatures (15, 25 and 35 degrees C). We analysed soluble phenolics, enzymatic activities (phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), and dry weight. The impact of the three temperatures was different i...

p-Coumaric acid is the precursor of phenylpropanoids, which are plant secondary metabolites that are beneficial to human health. Tyrosine ammonia lyase catalyzes the production of p-coumaric acid from tyrosine. Because of their photosynthetic ability and biosynthetic versatility, cyanobacteria are promising candidates for the production of certain plant metabolites, including phenylpropanoids. ...

In this paper, monitoring and sensor fault detection in a waste-water treatment process are discussed. Monitoring is based on the Takagi-Sugeno fuzzy model of a plant process obtained by using Gustafson-Kessel fuzzy clustering algorithm.The paper also explains the principle of the Takagi-Sugeno fuzzy model. The main idea is to cope with the non-linearity of a monitored process. The output of th...

Degradation of plant N in the rumen results in the formation of ammonia-N and NAN. Rumen bacteria utilise these breakdown products to synthesise their cell proteins. This study was carried out to investigate the in vivo degradation of N-labelled duckweed in the rumen and the utilisation of the degradation products by rumen bacteria. We found that duckweed protein was relatively resistant to rum...

background: leachatecontaining high levels of organic pollution with ammonia, halogenatedhydrocarbons, heavy metals and inorganic salts. among the various methods fortreating leachate, has been developed membrane processes so that a morebiological process of membrane processes is used for separation of solid -liquid. the aimof this study was to evaluate the efficiency of membrane bioreactor eff...

In 1932, Bergmann and Schleich (1) observed that glycerol extracts of swine kidney and pancreas possess the capacity of hydrolyzing glycyldehydrophenylalanine (glycyl-cr-aminophenylacrylic acid) to glycine, ammonia, and phenylpyruvic acid. To the enzyme system responsible, whose distinction from dipeptidase, carboxypeptidase, and aminopeptidase was demonstrated, they gave the designation of deh...

In this study, communities of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in nitrifying activated sludge (NAS) prepared by enriching sludge from a municipal wastewater treatment plant in three continuous-flow reactors receiving an inorganic medium containing different ammonium concentrations of 2, 10, and 30 mM NH4-N (NAS2, NAS10, and NAS30, respectively) were investiga...

Amide and ureide biogenic enzymes were measured in the plant fraction of soybean (Glycine max) nodules during the period 11 to 23 days after inoculation with Rhizobium japonicum (USDA 3I1b142). Enzymes involved in the initial assimilation of ammonia, i.e. glutamine synthetase, glutamate synthase, and aspartate aminotransferase, showed substantial increases in their specific activities over the ...