(C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2881-2885, 2009″
“A kind of univariate calibration, net analyte signal combined with standard addition (NAS-SAM) is presented for determination of Guaifenesin, Pseudoephedrine and Chlorpheniramine in the presence of each other by spectrophotometry. The method has both the advantages of the standard addition method and net analyte signal which enables the extraction selleck screening library of information concerning a certain analyte from spectra of multi-component mixtures. The use of full spectrum to calculate the net analyte signal vector and also no requirement of calibration

and prediction steps are the most important advantages of NAS-SAM. The simultaneous determination of Guaifenesin, Pseudoephedrine and Chlorpheniramine was performed in Britton-Robinson buffer (pH 9). Three pharmaceutical compounds were determined in concentration range of 0.5-100 mu mol L-1.

In this work, the method of NAS-SAM has been used for the determination of guaifenesin, pseudoephedrine and chlorpheniramine in some ternary mixtures and cough syrups with satisfactory results.”
“The screening effects MLN4924 concentration on the field enhancement factors of (3,3) and (5,0) finite length single-walled carbon nanotubes (SWCNTs) with respect to different kinds of tube terminations, either capped or H-terminated, are examined using first-principles

calculations. Results show that for capped SWCNTs, the field enhancement factors of the (3,3) tube are slightly greater than those of (5,0) ones, while for H-terminated tubes exhibit Nutlin-3 cost the opposite

effect. The effects of different endings on the SWCNT work functions are also investigated. Calculations show that for the capped SWCNTs, the work functions of (3,3) tubes are larger than those of (5,0) tubes, whereas for the H-terminated cases, the work functions of (3,3) tubes are smaller than those of the (5,0) tubes. Moreover, a saturated behavior of enhancement factors beta versus the length of tubes is observed. Finally, the field enhancement factors of fixed length tubes can be enhanced to eventually achieve a convergent tendency as their tube-tube distance increases.”
“Mineral oil diffusion in styrene-butadiene polymer films was investigated with a simple gravimetric sorption method. Over the selected range of temperatures and film thicknesses for which sorption tests were performed, the diffusion process is described in terms of Fick’s third law. Polymer dissolution was found to compete with the diffusion process especially at high temperature. Possible interference due to dissolution on data generated using a gravimetric method, resulted in an estimation of apparent activation energy using diffusion coefficient set calculated with Crank’s half-time relationship.