The parameters effecting the efficiency of thorium extraction on silica gel coated with Tri-octylphosphine oxide(TOPO) such as; HNO3 concentration, thorium concentration, TOPO concentration, flow rate and nature of diluent were studied and optimum conditions were determined. Various elution reag...

Simultaneous thermal analysis curves and X-ray examination were used to determine the intermediate steps for the dissociation of hydrated cerium(III) sulfate and to confirm those for the dissociation of hydrated cerium(III) nitrate and oxalate. Thermogravimetric methods were applied for these st...

Dissolved neodymium (Nd) and its radiogenic isotope composition (143Nd/144Nd, expressed as εNd) belong to the key parameters of the international GEOTRACES program, which aims to investigate the processes controlling the distribution of trace elements and their isotopes in the global ocean. We ...

The isotopes of thorium (Th) and neodymium (Nd) are used as tracers in oceanography, and are key parameters in the international GEOTRACES program. The very low concentrations of Th and Nd as well as the reactive nature of Th isotopes makes the analysis of seawater samples a complex process. Ana...

Two neodymium(III) fluorou ternary complexes, [Nd(C5H2F6O2)3(C18H15OP)2] (C5H2F6O2 = hexafluoroacetylacetone, C18H15OP = triphenylphosphine oxide) (1) and [Nd(C5H2F6O2)3(C12H24N3O4P)2] (C5H2F6O2 = hexafluoroacetylacetone, C12H24N3O4P) = tri(4-morphollno) phosphine oxide) (2) have been synthesize...

Electronic absorption spectra of neodymium acetate single crystals were measured at 293 and 4 K. The intensities of 4f–4f transitions were calculated and the Judd–Ofelt Ωλ parameters evaluated. These results differ in comparison with other lanthanide carboxylate compounds by relatively high ...

Two neodymium β-diketonates metal-organic complexes, Nd(TTA)3TPTZ (1) and Nd(BFA)3TPTZ (2), have been synthesized by using two β-diketone ligands 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (HTTA) and 4,4,4-trifluoro-1-phenyl-1,3-butanedione (HFBA), and a macrocyclic conjugate ligand, 2,4,6-...

The quality of electron microscopy (EM) visualization of biological objects is constantly improving, primarily with the usage of more complex technologies, such as serial block-face scanning electron microscopy (SEM), focused ion beam scanning electron microscopy, and array tomography. Here we s...

Male Wistar rats have been pretreated with either clofibrate or diethylhexylphthalate and the dose-dependency of induction of the microsomal, cytochrome P-452-driven fatty acid hydroxylase and peroxisomal fatty acid β-oxidation system investigated. Both clofibrate and DEHP specifically induced ...

Induction of the cytochrome P-450 mixed-function oxidase and specifically the cytochrome P-450 IVA1 isoenzyme by seven phenoxyacid herbicides in rat liver have been studied. Liver microsomes from rats orally treated with the herbicides at 3 dose levels showed a significant increase in total cyto...

The gene coding for the clofibrate-induced cytochrome P-452 has been isolated from a cDNA library and a full-length cDNA clone sequenced. The sequence was identical with that reported by Hardwick et al. [(1987) J. Biol. Chem. 262, 801–810] apart from the presence of an additional 75 nucleotides...

Hepatocyte nodules, a characteristic early step in the development of liver cancer in rats, has a distinctive resistance phenotype including a large decrease in total cytochromes P-450 and in two isozymes induced by phenobarbital and two by 3-methylcholanthrene. In this study, it has been observ...

The influence of four hypolipidaemic drugs (clofibrate, WY-14,643, clobuzarit and bezafibrate) on hepatic cytochrome P-450 and fatty acid metabolism in male rat liver microsomes has been investigated. All of the hypolipidaemic drugs tested significantly induced the hydroxylation of lauric acid a...

Eight structurally diverse hypolipidaemic agents have been examined for their ability to induce the microsomal cytochrome P-452-dependent fatty acid hydroxylase system and the enzymes of peroxisomal β-oxidation in rat liver. Using a specific ELISA method, we have shown that the cytochrome P-452...

We have examined the ability of a commercial mixture of polychlorinated biphenyls (Aroclor 1254) to induce hepatic cytochrome P-452-linked enzyme activities in rat and pigeon liver five days after its intraperitoneal injection. The results provide evidence that, at the doses used, Aroclor 1254 i...

The differences in the structure of polymer chain between the chondroitin-4-sulfate (C4-S) and the chondroitin-6-sulfate (C6-S) are reflected in the intrinsic viscosity values calculated starting from the traditional methods of Huggins, Kraemer, Mead and Fouss, and Martin, and by the method for ...

Chondroitin sulfate, an amino sugar polymer made of glucuronic acid and N-acetyl-galactosamine, is used in dietary supplements to promote joint health. Commonly used chondroitin sulfate is of animal origin and can pose potential safety problems including bovine spongiform encephalopathy (BSE). T...

In this work, chondroitin sulfate (CS) was extracted from chicken leg bone soup using the heat-resin static adsorption extraction (HSAE) method. The HSAE method was optimized as follows: resin dosage, 10%; adsorption time, 4.3 h; eluent concentration, 2 M; eluent time, 1.3 h, under which the yie...

Unsubstituted and 6-O-α-L-fucosylated propyl 2-acetamido-2-deoxy-β-D-galactopyranosides and their selectively O-sulfated (both in GalNAc and Fuc units) derivatives were synthesized as model compounds representing the fragments of fucosylated chondroitin sulfates (FCS) from sea cucumbers. Per-O...

Chondroitin-6-sulfate was oversulfated using chlorosulfonic acid–pyridine complex and isolated as the sodium salt. Infrared analysis of the native and oversulfated compound gave identical results in respect to the OH stretching, hemiacetal stretching and SO stretching. Absorption around 825 cm−...