Nitrate concentration in drinking water was directly determined by employing an ion selective liquid membrane electrode (ISE). This was constructed with poly(vynil chloride) as matrix on a solid conducting support. ...

The statistical evaluation of seven ion selective chemical sensors (ISE) for nitrate ion determination, based on polymeric membranes on a conductive support, has been carried out in this work. This was donw in order to ...

A urinary excretion study was conducted in six healthy male subjects to evaluate the percutaneous absorption of p-aminobenzoic acid (PABA) from three sunscreen preparations. The study was a crossover design and urine ...

A first prospection was made of the content and identity of the carbohydrates in Chilean soils. Seven volcanic and two alluvial soils were selected. Determinations, by the Anthrone method, were done of free carbohydrates ...

Electron Spin Resonance spectra were obtained of the salicyliden-2-imino-5-nitropyrimidine (1(.-)), N,N-bis(5-nitro-salicyliden). ethylendiamine (2(.-)), 2-hydroxy-5-nitro-benziliden-5-iminoquinoline (3(.-)) anion I radicals ...

Organic acids and phosphate were determined in soil aqueous extracts by capillary zone electrophoresis using indirect UV detection. The electrolyte system was 10 mM sodium benzoate with 0.5 mM tetradecyltrimetyl-ammonium ...

Dehydrogenase and respiratory activities were studies in six soils, five of volcanic origin and the other alluvial, as a reference. Dehydrogenases activity was measured by the reduction of 2, 3, 5- Tryphenyl Tetrazolium ...

The possibility of a total substitution of ega proteins in yellow cakes by vegetable proteins isolated from white lupine seeds was studied. The effects of several components on hardness, moisture content, volume, and shape ...

Two amaranth glutelin preparations, Gt-bo extracted with borate buffer at pH 10 and Gt-na extracted with 0.1 N NaOH, were characterized and compared with the amaranth polymerized 11 S globulin (Gp, globulin-P). Gt-bo and ...