Oxidation of nitric oxide in aqueous solution to nitrite but not nitrate: comparison with enzymatically formed nitric oxide from L-arginine. A spectrophotometric assay for nitrate using NADPH oxidation by Aspergillus nitrate reductase. Measurement of nitrite and nitrate in biological fluids by gas chromatography mass spectrometry and by the Griess assay: problems with the Griess assay—solutions...

to investigate the impact of overexpression of atnrt2.1 transgene from arabidopsis on nitrate uptake rate and to understand the regulation of endogenous hats by nitrate and glutamine amino acid (gln) in tobacco plants, wild-type and transgenic (f line) plants grown on soil for 4 weeks were transferred to hydroponic culture in a controlled-environment with a 16/8h l:d photoperiod at 24? c/20...

Nitrate uptake in Neurospora crassa has been investigated under various conditions of nitrogen nutrition by measuring the rate of disappearance of nitrate from the medium and by determining mycelial nitrate accumulation. The nitrate transport system is induced by either nitrate or nitrite, but is not present in mycelia grown on ammonia or Casamino Acids. The appearance of nitrate uptake activit...

Membrane separation is a very well known technology having a large number of applications. Separation of metal ions by selective membrane transport is of great importance from both fundamental and practical viewpoints. According to IUPAC, a membrane is defined as a heterogeneous phase which acts as a barrier to the flow of molecules and ionic species in liquid or vapour phase. Membranes can be ...

Coastal aquifers play key roles in providing freshwater resources to maintain the social and economic development coastal areas. However, climate change human activities have dramatically affected quantities qualities of groundwater aquifers. In this study, stoichiometric analysis hydrogeochemistry, multivariate analysis, isotopic trancing techniques were used reveal local hydrochemistry charac...

Nitrous oxide has been recognized as a product of denitrifying organisms since the early work of Gayon and Dupetit (1882a, b; 1886). Under some conditions it can be the major initial product (Wijler and Delwiche, 1954). Kluyver and Verhoeven (1954) have investigated the production of nitrous oxide by a large number of denitrifiers and conclude that its production and utilization is characterist...

abstract lettuce is one of the best accumulators of heavy metals and nitrate between leafy vegetables. through this research, it was tried to decreased cadmium absorption with humic acid (ha) and studies the effect of ha on the accumulation and metabolism of nitrate. plants were grown in the peat/perlite and irrigated with hoagland solution with addition of cadmium (2 and 4 mg l -1) and ha (100...

nitrate concentration of the soil, at the start of growing season, is high due to minerali-zation of soil organic n during the fall and the addition of n fertilizers. it may be useful to exploit this n form as much as possible. therefore, the nitrate uptake, assimilation and dry matter production of several wheat cultivars were examined in a series of experiments using a hydroponic culture syst...

Nitrate and arsenic often co-exist in groundwater sources. Reverse osmosis, electrodialysis, ion exchange are the commonly implemented technologies for nitrate removal. Compared to these that generate high-strength waste streams, biological treatment converts innocuous nitrogen gas without producing a concentrated waste. When water source, combining biotic process removal with an abiotic (i.e.,...