There is increasing interest in source separation and treatment of urine so as to recover nitrogen and phosphate more efficiently than treating combined wastewater. Although previous studies primarily focused on struvite precipitation for the recovery of phosphorus, the composition of urine changes during storage. The present study compared the precipitation conditions for fresh urine and hydro...

The effects of preparative parameters on the surface basicity, composition, and transesterification activities of several Ca-La metal oxide catalysts were investigated. Four different preparation methods: ammonia-ethanol-carbon dioxide precipitation, physical mixing, impregnation, and coprecipitation, were studied. It was found that the ammoniaethanol-carbon dioxide precipitation method resulte...

In 1932, Bergmann and Schleich (1) observed that glycerol extracts of swine kidney and pancreas possess the capacity of hydrolyzing glycyldehydrophenylalanine (glycyl-cr-aminophenylacrylic acid) to glycine, ammonia, and phenylpyruvic acid. To the enzyme system responsible, whose distinction from dipeptidase, carboxypeptidase, and aminopeptidase was demonstrated, they gave the designation of deh...

An anthracene oil-based pitch, supplied by Industrial Química del Nalón, S.A was used as carbon matrix precursor (softening point of 112oC; elemental analysis: C: 93.6 %, H: 4.4 %, N, 1.0 %, S, 0.5% and O, 0.5%). The iron oxide nanoparticles were obtained following different procedures: (i) toluene reflux of Fe(CO)5 with Pluronic P127 in the presence of H2 [1]; (ii) treatment of a mixture of Fe...

NATURE | VOL 400 | 5 AUGUST 1999 | www.nature.com 547 J. Chem. Phys. 108, 5888±5897 (1998). 26. MacGorman, D. R. & Rust, W. D. The Electrical Nature of Storms 32 (Oxford Univ. Press, New York, 1998). 27. Pruppacher, H. R. & Klett, J. D. Microphysics of Clouds and Precipitation 813±814 (Kluwer Academic, Dordrecht, 1996). 28. Di Palma, T. M., Latini, A., Satta, M. & Giardini Guidoni, A. Molecular...