The non-specific analytical methods for the guanidinium compounds in biological fluids have been unsatisfactory for many years. The methods presented in this paper have a greatly improved specificity and are not too complex for use in the clinical laboratory. A modified Sakaguchi color reaction for substituted guanidines is used in each procedure. Guanidinoacetic acid is measured by developing ...

The reaction of vanadium(III) trichloride with tert-butylphosphonic acid (t-BuPO3H2) in the presence of 1,10-phenanthroline/2,2'-bipyridine as an ancillary ligand in acetonitrile at room temperature afforded two dinuclear dicationic vanadium(IV) complexes [(VO)2(phen)2{t-BuPO2(OH)}2(OH2)2]·2Cl [1] and [(VO)2(bipy)2{t-BuPO2(OH)}2(OH2)2]·2Cl [2]. On the other hand, when the reaction was carried o...

in this work at the first step calcium hydroxide nano-particles were synthesized via sono-chemical method at room temperature. at the second step aminated multi-walled carbon nano-tubes was prepared via chemical modification of surfaces of cnt. finally modified-mwcnt and ca(oh)2 were added to paraloid matrix by aid of ultrasonic irradiation. paraloid-modified-mwcnt-ca(oh)2 nanocomposite was use...

Seeds of two Wrightia species, i.e. W. tinctoria and W. coccinea, synthesize triacylglycerols containing isoricinoleoyl (9-hydroxy-cw12-octadecenoyl, 9-OH-A18:l) moieties as the major lipid constituents. Seed maturation is accompanied by lipid accumulation and steep increase in the level of 9-OH-A 18:l in the total lipids, while relative proportions of palmitic (16:0), oleic (18:1), and linolei...

Oxidative stress is one of the key mechanisms linking ambient particulate matter (PM) exposure with various adverse health effects. The oxidative potential of PM has been used to characterize the ability of PM induced oxidative stress. Hydroxyl radical (•OH) is the most destructive radical produced by PM. However, there is currently no high-throughput approach which can rapidly measure PM-induc...

Z. Naturforsch. 56 b, 458^462 (2001); received April 4, 2001 Gallium(III) and Gallium(II) Amides, Gallium Amino Complexes, Gallium Coordination The reaction of /V,/V-di('butyl)-ethane1,2-diamine with NaH followed by anhydrous GaCl3 (molar ratios 1:2 :1) gives mainly an insoluble bis(diamido)gallium chloride together with a low yield (28%) of a soluble monocyclic dichlorogallium-[2-('butylamino)...

In this article,the dissolution of Boric acid in different temperature conditions, with density functional theory (DFT) is studied.  the Boric acid with chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dis...

In the frame of a systematic study on sequestering ability natural antioxidants towards metal cations, complexation coumarin-3-carboxilic acid (HCCA) with neodymium(III) and dioxouranium(VI) (uranyl, UO22+), overall stability constants resulting complexes, were evaluated from pH-potentiometric titration data at 37 °C in an aqueous solution (i.e., 0.16 mol/L NaClO4). The graphic representation c...

The facile synthesis of the first stable selenosilanoic acid-base adduct LSi(=Se)OH(dmap) 3 (L = CH[C(Me)NAr]2, Ar = 2,6-iPr2C6H3, dmap = 4-dimethylaminopyridine), the heavier analogue of the thiosilanoic acid adduct LSi(=S)OH(dmap) 1, is reported. Both adducts 1 and 3 react readily with MesCu (Mes = 2,4,6-trimethylphenyl) to form the novel dimeric Cu(I) complexes [LSi(=E)OCu]2 (4: E = S; 5: E ...

The identification and polarity of release of the major metabolite of 12-HETE produced by cultured canine renal tubular epithelial cells was determined. When incubated with 1.0 microM [3H]12-HETE for 1 h, cultured Madin Darby Canine Kidney (MDCK) cells converted 35% of the radiolabeled 12-HETE to a more polar metabolite. Following high performance liquid chromatography isolation and chemical de...