Calixresorcinarenes have proved to be unique molecules for molecular recognition via hydrogen bonding, hydrophobic and ionic interactions with suitable substrates such as cations. The study of the interactions involved in the complexation of different cations with calixresorcinarenes in solvent mixtures is important for a better understanding of the mechanism of biological transport, molecular ...

A semi-continuous and automated method for quantifying atmospheric ammonia at the parts per billion level has been developed. The instrument consists of a high efficiency diffusion scrubber, an electrolytic on-line anion exchange device, and a conductivity detector. Water soluble gases in sampled air diffuse through the porous membrane and are absorbed in an absorbing solution. Interferences ar...

This review presents the principles of conductometric measurements in ionic media and the equivalent electrical circuits of different designs for conductometric measurements. These types of measurements were first applied for monitoring biocatalytic reactions. The use of conductometric microtransducers is then presented and detailed in the case of pollutant detection for environmental monitorin...

Um sistema de análise química em fluxo com dois percursos analíticos foi desenvolvido para determinação de amônio em extratos de solo por condutometria. A amônia era gerada em linha em um meio alcalino, permeava através de uma membrana hidrofóbica (TPFE), sendo coletada em fluxo de água desionizada que transportava o analito para a cela de condutividade. O módulo de análise compreendia dois per...

______________________________________________________________________________ In this paper the conductometric titration of propranolol hydrochloride in pharmaceutical formulations using silver nitrate as titrant is proposed. The method was based on the formation of an insoluble salt (AgCl(s)) between the chloride of propranolol hydrochloride molecule and Ag(I) ions of the titrant AgNO3. The e...

spectrophotometric and electrochemical studies were successfully used in quantitative analysis of amitriptyline hydrochloride (ath) and nortriptyline hydrochloride (nth). conductometric titration were carried out in equeous solution using iodide and dopamine and serotonine as titrant. two new methods using spectrophotometry are dascribed for the determination of (ath) and (nth) with potassium b...

In this work, we have studied the impact of various stages cryopreservation by vitrification in ethylene glycolsucrose medium on plasma membranes adhesive properties 8-cell murine embryos and their specific electrical conductivity. Embryos were divided into following experimental groups: control, group 1 (incubation medium) 2 (complete cycle cryopreservation). The embryo exposure to did not aff...