[1] Electron capture and ionization cross sections for protons and nitrogen ions incident on N2 are measured in the energy range 10–100 keV using time of flight (TOF) coincidence counting techniques. In the case of proton impact the formation of N2 + ions dominates for both electron capture and ionization channels at all energies, whereas for N ions, the N2 + formation dominates for electron ca...

Cold (eV) ions of ionospheric origin are a major source magnetospheric plasma. These dominate the number density for most volume magnetosphere, time. This affects large-scale physics, including plasma temperature and pressure (and thus instability thresholds) Alfvén velocity energy transport with waves magnetic reconnection rate). also small-scale kinetic wave generation Hall physics reconnecti...

A balanced nutrient supply is essential for the healthy growth of plants in hydroponic systems. However, the commonly used electrical conductivity (EC)-based nutrient control for plant cultivation can provide amounts of nutrients that are excessive or inadequate for proper plant growth. In this study, we investigated the kinetics of major and minor nutrient uptake in a nutrient solution during ...

l. The concentrations of the major inorganic ions in the hemolymph of Periplanetn americana were determined as follows (in mM): Na+, 132; K+, 8.7; Mg*+, 4.7; Cazf, 3.7; Cl-, 107; PO:-, 1.04. 2. By the method of ultrafiltration, significant binding to macromolecules in hemolymph was demonstrated for the following ions: Na+, 22.0%; Mg*+, 25.5°/0; Ca*+, 16.2%; Cl-, 10.3%; PO:-, 26.9%. 3. K’ was no...

backgrounds and aims: the purpose of this study was to examine the effects of potassium, sodium and zinc metal ions on ammonium sulfate fraction of acid phosphatase activity of orange fruit. materials and methods: acid phosphatase was extracted and purified from orange fruit and then various samples as well as a control sample were prepared in vitro. in addition to substrates, ions of potassium...

in this research, chitosan was used for the removal of cr (vi) ions from aqueous solution. the effect of parameters like solution ph, initial cr (vi) concentration, agitation time, amount of adsorbent and agitation speed on the adsorption process was studied. the experimental equilibrium data were analyzed by using various models such as langmuir and freundlich. freundlich isotherm model fitted...

The EI mass spectra of four tert-butyldimethylsilyl ether derivatives of the major metabolite of prostaglandins F1 alpha and F2 alpha (PGF-M) are presented and discussed. Proposed ion assignments and fragmentation pathways are based on substituent shifts, on data from a deuterium-labeled methoxime analog, and on the analysis of collision-induced dissociation spectra of selected ions. Fragment i...