The endogenous contrast in thermoacoustic imaging is due to the water and ionic content in tissue. This results in poor tissue specificity between high water content tissues. As a result, exogenous contrast agents have been employed to improve tissue specificity and also increase the SNR. An investigation into the sources of contrast produced by several exogenous contrast agents is described. T...

A novel analytical approach involving the addition of an ionic liquid into the mobile phase of the thin-layer chromatography (TLC) system during the optimization of chromatographic separation of peptides was demonstrated. Different behavior of peptides in the TLC sytem was observed after the addition of 1,3-dimethylimidazolium methyl sulfate to the eluent in comparison to the system without the...

The aim of this work was to obtain comparative evaluation of the content of calcium (both the total and ionic forms), magnesium and phosphorus in the blood serum of goats during three physiological states characterized by much instability of the mineral balance. The study involved 15 goats, divided into 3 groups in different physiological states (breeding season, pregnancy, lactation period). T...

The effect of leaf detachment on chlorophyll fluorescence was analyzed for Zea mays, Cucumis sativus, Phaseolus vulgaris, and Echinochloa crus-galli. Results clearly indicate that detachment hastens the decrease in chlorophyll fluorescence during the course of chilling experiments. For maize and bean, the activity of photosystem II of chloroplasts isolated from detached leaves is lower than tha...

Correct mass and charge assignment for large highly heterogeneous macromolecular ions (e.g., large glycoproteins with significant carbohydrate content) presents a great challenge in native electrospray ionization mass spectrometry (ESI MS). A new approach to this problem combines complexity reduction (mass-selection of a narrow distribution of ionic species from a heterogeneous mixture) and gas...

The coagulation curve obtained by the technique previously reported by the authors has been recently interpreted by J. B. Graham and E. M. Barrow as explainable to a large extent by a variation of the ionic force of the medium during dilution. In order to overcome the influence of this physico-chemical factor and to reveal the action of the biological coagulation factors, the authors have perfo...

The fully plastic ionic polymer actuators based on Poly (vinylidenefluoridetrifluoroethylenechlorotrifluoroethylene) PVDF-CTFE polymer were investigated. The actuator consists of a high conductive electrolyte layer containing EMI-TF ionic liquid sandwiched between two CNT/polymer electrodes. To reduce the modulus of the CNT electrodes and hence enhance the actuation performance of the actuator,...

A method for the analysis of perchlorate in plants was developed, based on dry weight, and applied to the analysis of plant organs, foodstuffs, and plant products. The method reduced greatly the ionic interferences in water extracts of plant materials. The high background conductivity, due to the plant matrix, was reduced sufficiently to allow quantitation of perchlorate with little or no matri...