The synthesis of 3-alkyl(aryl)-4-(3-ethoxy-4-hydroxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones 3 from the reactions of 3-alkyl(aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones 2 with 3-ethoxy-4-hydroxybenzaldehyde is described. The acetylation and methylation reactions of the compounds 3 giving compounds of type 4 and 5, respectively, were investigated. The newly synthesized compound...

Five novel 3-alkyl-4-phenylacetylamino-4,5-dihydro-1H-1,2,4-triazol-5-ones (2) were synthesized by the reactions of 3-alkyl-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones (1) with phenylacetyl chloride and characterized by elemental analyses and IR, 1HNMR, 13C-NMR and UV spectral data. The newly synthesized compounds 2 were titrated potentiometrically with tetrabutylammonium hydroxide in four non-...

21. SCOTT, T. K. & W. R. BRIGGS. 1960. Auxin relationships in the Alaska pea (Pisum sativum). Am. J. Botany 47: 492499. 22. SHIBAOKA, H. & T. YAMAKI. 1959. A sensitized Avena curvature test & identification of the diffusible auxin in Avena coleoptile. Botan. Mag. Tokyo 72: 152-158. 23. SKOOG, F. 1938. Absorption & translocation of auxin. Am. J. Botany 25: 361-372. 24. STEEVES, T. A. & W. R. BRI...

This article describes a potentiometric ocean acidification simulation system which automatically regulates pH through the injection of 100 % CO2 gas into temperaturecontrolled seawater. The system is ideally suited to longterm experimental studies of the effect of acidification on biological processes involving small-bodied (10–20 mm) calcifying or non-calcifying organisms. Using hobbyist-grad...

The aquatic plant Pistia stratiotes L. is environmentally hazardous and requires effective methods for its utilization. harmfulness of these plants determined by their excessive growth in water bodies degradation local ecosystems. Mechanical removal widespread but fairly resource-intensive technology. However, are polymer-containing substrates have a great potential conversion into bioenergy. a...

BACKGROUND Chitosan, a non-toxic, biodegradable and biocompatible polysaccharide has attained great interest in pharmaceutical applications, as versatile drug delivery agent. Chitosan has been already shown to serve as vehicle for sustained drug release by chitosan-vanadium(IV) complex from a chitosan gel matrix. Therefore, chitosan gel proved to retain vanadium and preserve its insulin-mimetic...

Abstract Stability and structure of complexes between silver (I) l -methionine (L) deduced from potentiometric 1 H NMR measurements allow to assume the prevailing several protonated species. The experimental data are compatible with formation following complexes: AgL, AgL 2 , AgH L, L 3 4 . coordination sites obtained by spectra, showing that only bond methylthioether sulfur atom is responsible...

the complexation reactions between diacetyl monooxime (damo), imidazole (him), histamine (hist) and histidine (his) with co2+, ni2+ and cu2+ were studied potentiometrically in aqueous solution at 25 °c and m= 0.5 m kno3. the overall stability constants log b's of species were obtained by computer refinement of ph-volume data using best computer program. several models were tested and, based on ...

A potentiometric biosensor for the determination of trypsin is described based on current-controlled reagent delivery. A polymeric membrane protamine-sensitive electrode with dinonylnaphthalene sulfonate as cation exchanger is used for in situ generation of protamine. Diffusion of protamine across the polymeric membrane can be controlled precisely by applying an external current. The hydrolysis...

Abstract Titrations are a group of techniques that have contributed considerably to developing the chemical industry and chemistry itself. Currently, Consultative Committee for Amount Substance has recognized titration as one primary methods determining amount substance. In this context, an accurate gravimetric complexometric method was implemented determine purity ethylenediaminetetraacetic ac...