The impor tance of several pyr imidines in nucleic acid metabo l i sm has made the invest igat ion of their chemical analogs of interest to cancer chemotherapy. Recent ly , Heidelberger and coworkers (3) synthesized a group of f luorinated pyr imidines and pyr imid ine precursors which have been shown to have an t i tumor ac t iv i ty in several an imal tumor systems. M c I v e r (6) et al. stu...

During the last few years several methods have been described for the calibration of W a r b u r g flasks and manomete r s wi th mercury1, ~ ,8. Al though in all these methods the calibration is carried out in two steps, so t ha t it can easily be performed by one operator, they have the disadvantage, in our view, t ha t the flasks m u s t always be filled wi th so much mercury t ha t it exact ...

Descr ipt ion logic-based configurat ion applications have been used w i t h i n A T & T since 1990 to process over two and a half b i l l ion dollars wor th of orders. Whi le this fami ly of applications[4] has widely acknowledged importance, it is di f f icul t to use for pedagogical purposes since the typical product configured is a highly interconnected, complicated technical piece of equip...

The aim of this study was to construct and characterize an ion selective electrode for the potentiometric determination of thorium ions. On hand study we introduced a new calixarene molecule p-tert-butyl-thiacalix[4]arene derivative as ionophore for thorium(IV) selective polymeric membrane electrode. Due to the decisive role of solvent mediators, we fabricated membranes with the plasticizers DB...

the determination of formation constants of binary inner transition metal complexes where m=y(iii) or la(iii) or ce(iii) or pr(iii) or nd(iii) or sm (iii) or gd (iii) or dy (iii) or th(iv) andl = creatinine have been carried out using irving–rossotti titration technique in aqueous mediaat different temperatures and at ionic strength. to understand more about the nature ofequilibrium involving i...

The common filamentous fungi can sorb heavy metals (Zn, Cd, Pb, Fe, Ni, Ag, Th, Ra & U) from aqueous solutions to varying extents. Fungal biosorption largely depends on parameters such as pH, metal ion and biomass concentration, physical or chemical pretreatment of biomass, and presence of various legends in solution. When compared with commercial ion exchange resins, carbons and metal oxides, ...

The coordination chemistry of actinide(IV) ions with hydroxypyridinone ligands has been initially explored by examining the complexation of Th(IV) ion with bidentate PR-1,2-HOPO (HL1), PR-Me-3,2-HOPO (HL2), and PR-3,4-HOPO-N (HL3) ligands. The complexes Th(L)4, Th(L)4, and Th(L)4 were prepared in methanol solution from Th(acac)4 and the corresponding ligand. Single-crystal X-ray diffraction ana...

O u r pr ior observat ions wi th ac t iva ted mononuc lea r phagocytes have impl i ca ted oxygen in te rmedia tes as impor t an t effector molecules in bo th the in t race l lu la r destruct ion and the growth inhib i t ion of Toxoplasma gondii (1-3). Because this complex ox ida t ive in terac t ion m a y be m o d u l a t e d by the presence of endogenous scavengers wi th in e i ther the paras ...

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Sorption techniques are widely used to remove heavy metal ions from large volumes of aqueous solutions. Herein, the natural and some artificial materials, such as clay minerals, biosorbents, carbon-nanomaterials, metal oxides, are reviewed as adsorbents in the removal of different heavy metal ions, such as Ni(II), Cu(II), Pb(II), Cd(II), Cs(I), Eu(III), Th(IV), Cr(VI) from large volumes of aque...