soil samples were collected from seven sites in and around the metropolitan area of mexicocity. the locations were chosen as possible sources of fugitive dusts which contribute to suspended particulate matter in the atmosphere of mexico city. x-ray fluorescence (xrf) was used to determine the concentrations of several major elements (si, k, ca, ti, mn, and fe), as well as of other trace element...

multi drug resistance(mdr) is a major problem in the treatment of cancer and hemalological malignancies. this resistance is multi factorial and is the result of decreased intra cellular drug accumulation. this is partly due to the presence of a 170kd intra membranous protein termed p-glycoprotein(p-gp) that is an energy-dependent efflux pump which has increased expression on drug-resistance cel...

objective(s):the objective of this study was to investigate the interaction of daunorubicin (dnr) and cardiac myosin (cm) and the changes in mice hearts to exhibit dnr-induced cardiotoxicity . materials and methods:the interaction between dnr and cm was expressed using fluorescence quenching at ph 4.0-9.0 and 15-37 °c. dnr-induced cardiotoxicity was studied using in vivo experiment.  forty grou...

a simple, rapid, selective and highly sensitive fluorimetric method for determination of two catecholamines, i.e. norepinephrine (ne) and epinephrine (ep), in serum samples was developed. the method is based on the fluorescence sensitization of terbium (tb3+) by complexation with both catecholamines in the presence of lanthanum (la3+), as a co-cation, and in a na2so3 solution (chemical deoxygen...

the comparison of growth processes and fluorescent properties of cdznte semiconductor quantum dots that are synthesized in different concentrations of zn2+ in water are discussed in this paper. the samples are characterized through absorbtion (uv) and photoluminescence spectra (pl). the results show that when the reaction time is prolonged, the absorption peak and fluorescent emission peak pres...

in the present study, we investigated the effect of a new anticancer pd(ii) complex, 1,10-phenanthroline-n-butyl dithiocarbamato pd(ii) nitrate, on the heme releasing from human hemoglobin (hb) as well as alterations in the structure and function of hb using different spectroscopic methods of uv-vis, fluorescence and circular dichroism (cd)at two temperatures of 25 and 37 °c. fluorescence data ...

determination of terazosin hydrochloride dihydrate (trz) in drug substance and tablets was studied by fluorimetric techniques. the fluorimetric methods are based on: (1) measurement of the native fluorescence of the drug in water at 750 nm after excitation at 330 nm. (2) sensitizing the native fluorescence by formation a binary complex of drug with aqueous uranyl acetate (0.1% w/v) at the same ...

We report the synthesis and photophysical properties of three biperylene-based dendrimers, which show red fluorescence in water. A fluorescence microscopy study demonstrated uptake of biperylene-based dendrimers in living cells. Our results indicate that these biperylene-based dendrimers are promising candidates in fluorescence imaging applications with the potential as therapeutic carriers.