Ascorbate, 2-mercaptoethanol, and 2,3-dimercaptopropanol (l-3) are used as protective agents to stabilize solutions of tetrahydrofolate and its derivatives. The protective action of these compounds has been thought to be due exclusively to their reducing properties. The spontaneous decomposition of HI-folate to the diazotizable amine, p-aminobenzoylglutamate, has been used to measure quantitati...

this paper discusses the biosorption of ni(ii) ions from aqueous solutions by bacillus sphaericus biomass. the biosorption process was affected by the solution ph, biomass concentration, contact time, temperature and initial ni(ii) concentration respectively. the sorption kinetics and equilibrium data were described well with the pseudo-second order kinetic model and the freundlich isotherm mod...

Occasionally, the only postmortem samples available for analysis are contaminated with formaldehyde, either due to embalming prior to sampling or because analysis is carried out only when formalin-fixed tissues retained for histological study are available. Formaldehyde reacts with several drugs of forensic interest that contain either a primary or a secondary amine group to form their N-methyl...

The effects of liquid surface tension were investigated on gas-liquid interfaces in bubbly flows through the analysis hydrodynamic and mass transfer features. Tap water aqueous solutions with two types surfactant (cationic anionic) are used as phases. In fact, these surfactants organic collectors consisting an amine ester. influences concentration superficial gas velocity volumetric coefficient...