This work studied the effect of nitrogen functional group modification on activated carbon synthesized from vetiver root waste pores development. Synthesis was carried out by hydrothermal carbonization at a temperature 225 ⁰C for 18 hours followed chemical activation using K2FeO4as agent in furnace 800 2 with atmosphere flowed rate 100 mL/minute. Urea used as source. The variation urea concentr...

Ammonia oxidation in laboratory liquid batch cultures of autotrophic ammonia oxidizers rarely occurs at pH values less than 7, due to ionization of ammonia and the requirement for ammonium transport rather than diffusion of ammonia. Nevertheless, there is strong evidence for autotrophic nitrification in acid soils, which may be carried out by ammonia oxidizers capable of using urea as a source ...

In the crystal structure of the title compound, C(6)H(7)N·CH(4)N(2)O, the 2-methyl-pyridine and urea mol-ecules are linked via N-H⋯O and N-H⋯N hydrogen bonds, forming ribbons extending along the a axis. The dihedral angle between the 2-methyl-pyridine and urea mean planes is 89.09 (9)°. The methyl group shows rotational disorder wherein the H atoms are located over two sets of sites with equal ...

Am. J. Enol. Vitic. 57:2 (2006) 113 Many potentially toxic substances can be present in food and beverages. Advances in detection methods have lead to the discovery of many compounds in wines, such as ethyl carbamate, that could be harmful to humans. This naturally occurring compound is considered potentially dangerous to humans, as it exhibits carcinogenic activity in a variety of laboratory a...

in order to evaluate the efficiency of inoculation of chickpea seeds with mesorhizobium and application of nitrogen and zinc on yield and yield components of rainfed chickpea an experiment was carried out in research station of shirvan-chardavel, ilam. the experiment was conducted in randomized complete block design (rcbd) with six treatments including mesorhizobium inoculation, nitrogen (40 kg...

Coccomyxa acidophila is an extremophile eukaryotic microalga isolated from the Tinto River mining area in Huelva, Spain. Coccomyxa acidophila accumulates relevant amounts of β-carotene and lutein, well-known carotenoids with many biotechnological applications, especially in food and health-related industries. The acidic culture medium (pH < 2.5) that prevents outdoor cultivation from non-desire...

a simple and green chemical procedure was reported for the synthesis of dihydropyrimidinones from various aldehydes, ethyl acetoacetate and urea or thiourea using  holmium chloride as catalyst. the reactions were performed under solvent free conditions with ultrasound irradiation as the energy source. the advantages of this protocol include the excellent yield, operational simplicity, short tim...