Isotope exchange in low pressure cold plasmas of H(2)/D(2) mixtures has been investigated by means of mass spectrometric measurements of neutrals and ions, and kinetic model calculations. The measurements, which include also electron temperatures and densities, were performed in a stainless steel hollow cathode reactor for three discharge pressures: 1, 2 and 8 Pa, and for mixture compositions r...

Furthermore, it made use of umbilical girth, which was difficult to measure in the donkeys. The equation of Eley and French (1993) for adult donkeys also consistently overestimated the liveweights of the Moroccan donkeys. Hard working donkeys, particularly in areas where the feed supply is irregular, are more likely to be in poor than in good body condition. Unfortunately Eley and French (1993)...

The extensive demand for cleaner environment is forcing the chemical industry to use less hazardous materials. In this regard, solid catalysts have lately attracted the attention of scientists and researchers around the world.1–8 By using sufficient amounts of these heterogeneous catalysts, their catalytic activity for ester formation can be equivalent to that of conventional homogeneous cataly...

Self-metalation is a promising route to include single metal atom in tetrapyrrolic macrocycle organic frameworks supported by surfaces. The molecule–surface interaction may provide the charge transfer and geometric distortion of molecular plane necessary for inclusion. However, at surface presence an activation barrier can represent obstacle that cannot be compensated higher substrate temperatu...

Manganese oxides (MnOx) have attracted particular attention in the selective catalytic reduction of NOx with NH3 (NH3-SCR) because their excellent low-temperature activity. Herein, we prepared a highly efficient MnO2 (MnO2-M) catalyst through facile ball milling-assisted redox strategy. MnO2-M shows 90% conversion wide operating temperature window 75–200 °C under gas hourly space velocity 40,00...

Danson, M. J. & Perham, R. N. (1976) Biochem. J. 159, 677-682 Danson, M. J., Hooper, E. A. & Perham, R. N. (1978a) Biochem. J. 175, 193-198 Danson, M. J., Fersht, A. R. & Perham, R. N. (1978b) Proc. Natl. Acad. Sci. U.S.A. in the press Durchschlag, H. (1975) Biophys. Struct. Mech. 1 169-188 Eley, M. H., Namihara, G., Hamilton, L., Munk, P. & Reed, L. J. (1972) Arch. Biochem. Biophys. 152, 655-6...

Aims. We study the formation of water and methanol in the dense cloud conditions to find the dependence of its production rate on the binding energies, reaction mechanisms, temperatures, and grain site number. We wish to find the effective grain surface area available for chemical reaction and the effective recombination timescales as functions of grain and gas parameters. Methods. We used a Mo...

The Friedel-Crafts acylation of furan to produce 2-acyl by using acetic anhydride is industrially important but it uses highly polluting liquid acids as catalysts. In this study, supported modified heteropoly were used heterogeneous catalysts in a solventless green process. Metal exchanged dodecatungstophosphoric acid (DTP) was loaded on three different supports, and its effect evaluated. 20% w...