Hydration and Ion-Pair Formation of NaNO(aq): A Vibrational Spectroscopic and Density Functional Theory Study.

Qualitative and quantitative Raman and infrared measurements on sodium nitrate (NaNO) solutions have been carried out over a wide concentration range (5.56 × 10-7.946 mol/L) in water and heavy water.

On the Hydration of Heavy Rare Earth Ions: Ho, Er, Tm, Yb and Lu-A Raman Study.

Raman spectra of aqueous Ho, Er, Tm, Yb, and Lu-perchlorate solutions were measured over a large wavenumber range from 50-4180 cm. In the low wavenumber range (terahertz region), strongly polarized Raman bands were detected at 387 cm, 389 cm, 391 cm, 394 cm, and 396 cm, respectively, which are fairly broad (full widths at half height at ~52 cm). These isotropic Raman bands were assigned to the breathing modes, ν Ln-O of the heavy rare earth (HRE) octaaqua ions, [Ln(HO)].

Hydration and Ion Pair Formation in Aqueous Lu- Solution.

Aqueous solutions of Lu- perchlorate, triflate and chloride were measured by Raman spectroscopy. A weak, isotropic mode at 396 cm (full width at half height (fwhh) at 50 cm) was observed in perchlorate and triflate solutions. This mode was assigned to the totally symmetric stretching mode of [Lu(OH₂)₈], ν₁LuO₈.

Raman spectroscopic characterization of light rare earth ions: La, Ce, Pr, Nd and Sm - hydration and ion pair formation.

Raman spectra of aqueous La, Ce, Pr, Nd and Sm - perchlorate solutions were measured and weak strongly polarized Raman bands were detected at 343 cm, 344 cm, 347 cm, 352 cm and 363 cm, respectively. The full width at half height for these bands is quite broad (∼50 cm) in the isotropic spectrum and the band width increases with increasing solute concentration. The polarized Raman bands were assigned to the breathing modes of the nona-aqua ions of the mentioned rare earth ions.

Hydration and ion pair formation in aqueous Y(3+)-salt solutions.

Raman spectra of aqueous yttrium perchlorate, triflate (trifluoromethanesulfonate), chloride and nitrate solutions were measured over a broad concentration range (0.198-3.252 mol L(-1)).

Hydration and ion pair formation in common aqueous La(III) salt solutions--a Raman scattering and DFT study.

Raman spectra of aqueous lanthanum perchlorate, triflate (trifluorosulfonate), chloride and nitrate solutions were measured over a broad concentration (0.121-3.050 mol L(-1)) range at room temperature (23 °C).

Vibrational spectroscopic studies and DFT calculations on NaCH3CO2(aq) and CH3COOH(aq).

Aqueous solutions of sodium acetate, NaCH3CO2, and acetic acid, CH3COOH, were studied using Raman and infrared spectroscopy. The spectra were recorded over a large concentration range, in the terahertz region and up to 4000 cm(-1). In the isotropic Raman spectrum in R-format, a polarized band at 189 cm(-1) was assigned to the ν1Na-O stretch of the hydrated Na(+)-ion and a shoulder at 245 cm(-1) to the restricted translation band, νsO-H···O* of the hydrated acetate ion, CH3CO2(-)(aq).

Hydration and speciation studies of Mn2+ in aqueous solution with simple monovalent anions (ClO4-, NO3-, Cl-, Br-).

Raman spectroscopic measurements have been performed on aqueous solutions of Mn(ClO4)2, MnCl2, MnBr2, and Mn(NO3)2 in the terahertz region (40-600 cm(-1)) and to wavenumbers up to 4200 cm(-1) employing an absorption gap in these light pink coloured solutions. In Mn(ClO4)2 solutions of water and heavy water, the hexahydrate and its deuterate, [Mn(OH2)6](2+) and [Mn(OD2)6](2+), were characterized as showing a very weak, strongly polarized band at 354 cm(-1) and 338 cm(-1), respectively. These modes were assigned to ν1 MnO6 of [Mn(OH2)6](2+) and [Mn(OD2)6](2+).

Hydration of the calcium(II) ion in an aqueous solution of common anions (ClO4-, Cl-, Br-, and NO3-).

Raman spectra of aqueous calcium salt solutions, Ca(ClO(4))(2), CaCl(2), CaBr(2), and Ca(NO(3))(2), were measured from the concentrated solution stage to more dilute solutions (6.08-0.1 mol L(-1)) at 23 °C in water and heavy water down to 40 cm(-1).

Raman spectroscopic studies and DFT calculations on tribromoacetic acid and tribromoacetic acid-d.

The Raman spectra of crystalline tribromoacetic acid (CBr(3)COOH), its deuterated analog (CBr(3)COOD) and a partially deuterated acid (CBr(3)COOD/H) have been measured using Raman spectroscopy. Density functional theory (DFT) calculations have been carried out in order to compare the measured spectra with the calculated ones and the bands have been assigned. The theoretical frequencies are close to the ones of the cyclic dimer in the crystal and this fact implies the "oriented gas" model for this compound.

Vibrational spectroscopic studies and DFT calculations on tribromoacetate and tribromoacetic acid in aqueous solution.

Aqueous solutions of sodium tribromoacetate (NaCBr3CO2) and its corresponding acid (CBr3COOH) have been studied using Raman and infrared spectroscopy. The spectra of the species in solution were assigned according to symmetry Cs. Characteristic bands of CBr3CO2-(aq) and the tribromoacetic acid, CBr3COOH(aq), are discussed.

Hydration of beryllium(II) in aqueous solutions of common inorganic salts. A combined vibrational spectroscopic and ab initio molecular orbital study.

Raman spectra of aqueous beryllium perchlorate, chloride, nitrate, and sulfate solutions have been measured over a broad concentration (0.098-4.950 mol L(-1)) range.

Speciation studies in aqueous HCO3(-)-CO3(2-) solutions. A combined Raman spectroscopic and thermodynamic study.

Raman (and a few additional FT-IR) spectroscopic measurements of sodium and potassium carbonate and hydrogencarbonate in aqueous solution have been carried out over wide concentration ranges at room temperature and at elevated temperatures. The bands of the CO3(2-)(aq) and HCO3(-)(aq) species, which possess pseudo D3h and C1 symmetry respectively, have been assigned and discussed. Quantitative Raman measurements and thermodynamic calculations on KHCO3 solutions show that the salt does not dissolve congruently in aqueous solutions but forms small amounts of CO3(2-).

Raman and infrared spectroscopic investigations on aqueous alkali metal phosphate solutions and density functional theory calculations of phosphate-water clusters.

Phosphate (PO(4)(3-)) solutions in water and heavy water have been studied by Raman and infrared spectroscopy over a broad concentration range (0.0091-5.280 mol/L) including a hydrate melt at 23 degrees C.

Diamond-like carbon films for polyethylene femoral parts: Raman and FT-IR spectroscopy before and after incubation in simulated body liquid.

In artificial prosthetics for knee, hip, finger or shoulder joints, ultrahigh molecular weight polyethylene (UHMW-PE) is a significant material. Several attempts to reduce the wear rate of UHMW-PE, i.e.

Vibrational spectroscopic studies and density functional theory calculations of speciation in the CO2-water system.

Raman spectra of CO(2) dissolved in water and heavy water were measured at 22 degrees C, and the Fermi doublet of CO(2), normally at 1285.45 and 1388.15 cm(-1) in the gaseous state, revealed differences in normal water and heavy water, although no symmetry lowering of the hydrated CO(2) could be detected.

Nano- and microstructure of short fibre reinforced and unreinforced hydroxyaptite.

Hydroxyapatite (HA) and alumina short fibre reinforced hydroxyapatite (Al2O3/HA) were processed by uniaxial pressing of green bodies with 200 MPa and sintering in air for 4 hours at 1150 degrees C, 1175 degrees C and 1200 degrees C. The phase composition of the materials were investigated by transmission electron microscopy and Raman spectroscopy. Results were supported by X-ray diffraction.

[Calcium-oxygen modified amorphous and nanocrystalline carbon layers as biomaterials].

Undoped and Ca-O-modified diamond-like carbon coatings were deposited by a direct current discharge. Hardness and Young's modulus of Ca-O-modified DLCs were reduced in comparison with the undoped DLC, but the adherence of the Ca-O-modified films is improved. Ca-O-modified DLCs have a higher fraction of nano-crystalline regions with carbon in sp2 hybridisation.

Diamond-like carbon coatings with Ca-O-incorporation for improved biological acceptance.

Diamond-like carbon (DLC) coatings were modified by doping the thin films with Ca-O compounds. Raman spectroscopy indicates growth of sp(2)-hybridised, ordered regions in size and/or number within the amorphous carbon-hydrogen network as a result of the Ca-O-incorporation. CaCO(3) was identified by X-ray induced photoelectron spectroscopy.

Expression of the messenger RNAs for luteinizing hormone-releasing hormone (LHRH) and its receptor in human ovarian epithelial carcinoma.

Recently we reported the presence of specific high affinity binding sites for luteinizing hormone-releasing hormone (LHRH) and its analogues (Kd = 1.5 or 1.7 nM) in the human epithelial ovarian cancer cell lines EFO-21 and EFO-27.

Expression of luteinizing hormone releasing hormone and its mRNA in human endometrial cancer cell lines.

Recent results have shown that specific binding sites for luteinizing hormone-releasing hormone (LHRH) are present in biopsy samples of human endometrial cancer and in the human endometrial cancer cell lines Ishikawa and HEC-1A. The proliferation of these cell lines was retarded by LHRH analogs. The present study was undertaken to determine whether these endometrial tumor cells also produce LHRH or an LHRH-like peptide which could serve as natural ligand for the LHRH binding sites.

Chromatographic and antigenic properties of Echinococcus granulosus hydatid cyst-derived glycolipids.

The neutral and acidic fraction glycolipids of Echinococcus granulosus metacestode tissue compartments were isolated, defined by their chromatographic and antigenic properties, and assessed as to their efficacy as antigens in the serodiagnosis of human hepatic cystic and alveolar echinococcosis, and other helminthiases. Analyses were accomplished by thin-layer chromatography immunostaining and ELISA. The neutral glycolipid fraction's major carbohydrate epitope was the same as or very similar to that of Taenia crassiceps neutral glyco(sphingo)lipids, as represented by the 'neogala'-series core structure.

High affinity binding and direct antiproliferative effects of LHRH analogues in human ovarian cancer cell lines.

Recently, specific binding sites for luteinizing hormone releasing hormone (LHRH) and its analogues have been demonstrated in biopsy samples of human epithelial ovarian cancer. Their biological significance remained obscure. In this study we ascertained whether such LHRH-binding sites are also present in the human epithelial ovarian cancer cell lines EFO-21 and EFO-27 and if they could mediate antiproliferative effects of LHRH analogues.