Woodland sage (Salvia nemorosa) is an important native medicinal plant in Iran and is considered as a rich source of phenolic and flavonoids compounds. The present research was conducted with respect to the optimization of medium for biomass accumulation and secondary metabolite production in cell suspension culture of S. nemorosa. In this research the effects of total nitrogen content (0, 15, ...

Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web compartments are typically coupled and controlled by generalist fish top predators. However, the...

Carcinus maenas and Necora puber were exposed to air for 72 h and 18 h, respectively, at 18 degreesC. Nitrogen excretion, blood and muscle ammonia content and blood urate and lactate content were recorded throughout the experimental emersion and following reimmersion (recovery period). During emersion, the rate of ammonia excretion was strongly reduced in both species, while urea and amine excr...

Kim, Ki-Han (Wayne State University, Detroit, Mich.). Properties and distribution of intracellular putrescine in a Pseudomonas. J. Bacteriol. 91:193-197. 1966.-A Pseudomonas species which contains putrescine as the only intracellular polyamine was used to study the distribution of putrescine in the cells and the changes in putrescine content upon nitrogen or carbon and nitrogen starvation. In t...

ffects of L-asparagine and L-glutamine on growth, pigments content and metabolism of haseolus vulgaris plants, at two stages of plant growth and development in was investigated in icropropagated tissues (in vitro). In general, all growth parameters increased by 1 & 2 mM sparagine or glutamine treatments while decreased in response to other concentrations (3, 4 & 5 M), Similarly total carbohydra...

The present study was undertaken to compare the nitrogen content of human feces as determined by the Kjeldahl technic and the micro-Dumas method as utilized in the automated Coleman nitrogen analyzer. The standard deviation between duplicate determinations of the same sample was 0.06% nitrogen in the case of the nitrogen analyzer and 0.02% nitrogen for the Kjeldahl method. The standard deviatio...

In order to evaluate the effects of different slope lengths (1, 2, 3, 4, and 5 m) and different vegetation coverage ratios (20%, 45%, 60%, and 90%) on the mechanisms of nutrient loss and runoff producing processes, we have conducted 14 simulated rainfall experiments. The results show that N and P loss are decided by the concentration and the runoff volume, but when the amounts of N and P in top...

The ability of two strains of Azotomonas insolita and one strain classified only as Azotomonas species to use molecular nitrogen was investigated by use of several techniques. Molecular (15)N(2) incorporation by growing cultures of Azotomonas was inconsistent and limited. In addition, attempts to demonstrate nitrogen fixation in growing cultures by the radioactive (13)N(2) technique were negati...

A laboratory scale aeration treatment system was built to study the fate of nitrogen during aeration of pig slurry. For each run evaluated, the nitrogen mass balance was determined including measurement of the nitrous oxide gas emissions. Intermittent aeration led to a nitrogen removal of about 53% of the total nitrogen content of the raw slurry. About 18% of the total nitrogen content of the r...

We investigated the mechanical properties of nitrogen-containing graphene under tensile loading via molecular dynamics (MD) simulations. In the MD simulation, we used three types of potential functions: the second–generation reactive empirical bond order (REBO) potential for covalent C–C bonds, the Tersoff potential for covalent C–N bonds, and the Lennard–Jones potential for the interlayer inte...