Degradation of Contaminants of Emerging Concern by Electrochemical Oxidation: Coupling of Ultraviolet and Ultrasound Radiations.

In this work, we study the electrochemical oxidation of methyl red, a dye present in textile industrial effluents, which is selected as the model for the degradation of Contaminants of Emerging Concern. The influence of the initial pollutant concentration (1-5 mg dm), applied current density (2-15 mA cm), and the coupling of ultraviolet or ultrasound radiation have been studied using a titanium plate as anode. The results show that electrochemical oxidation is able to efficiently remove methyl red, and the process efficiency decreases with the initial pollutant concentration.

Large Magnetoelectric Coupling Near Room Temperature in Synthetic Melanostibite Mn FeSbO.

Multiferroic materials exhibit two or more ferroic orders and have potential applications as multifunctional materials in the electronics industry. A coupling of ferroelectricity and ferromagnetism is hereby particularly promising. We show that the synthetic melanostibite mineral Mn FeSbO (R3‾ space group) with ilmenite-type structure exhibits cation off-centering that results in alternating modulated displacements, thus allowing antiferroelectricity to occur.

Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6.

Cation ordering in ABO3 perovskites adds to their chemical variety and can lead to properties such as ferrimagnetism and magnetoresistance in Sr2 FeMoO6 . Through high-pressure and high-temperature synthesis, a new type of "double double perovskite" structure has been discovered in the family MnRMnSbO6 (R=La, Pr, Nd, Sm). This tetragonal structure has a 1:1 order of cations on both A and B sites, with A-site Mn(2+) and R(3+) cations ordered in columns and Mn(2+) and Sb(5+) having rock salt order on the B sites.

Synthesis, structures and magnetic properties of the dimorphic Mn2CrSbO6 oxide.

The perovskite polymorph of Mn(2)CrSbO(6) compound has been synthesized at 8 GPa and 1473 K. It crystallizes in the monoclinic P21/n space group with cell parameters a = 5.2180 (2) Å, b = 5.

Spin-glass behavior and incommensurate modulation in high-pressure perovskite BiCr0.5Ni0.5O3.

The BiCr(0.5)Ni(0.5)O(3) perovskite has been obtained at high pressure.

High-pressure synthesis, structural and complex magnetic properties of the ordered double perovskite Pb2NiReO6.

The ordered double perovskite Pb2NiReO6 has been prepared at 6 GPa and temperatures ranging from 1273 to 1373 K. Its crystal structure determined by X-ray powder diffraction and selected area electron diffraction shows monoclinic symmetry with centrosymmetric space group I2/m (a = 5.6021(1) Å, b = 5.

Spinel to CaFe2O4 transformation: mechanism and properties of beta-CdCr2O4.

The CdCr(2)O(4) spinel transforms to a 10.6% denser new polymorph of the CaFe(2)O(4)-type structure at 10 GPa and 1100 degrees C. This new polymorph has a honeycomb-like structure because of double rutile-type chains formed by [Cr-O(6)] edge-shared octehedra.

Antiferromagnetism and spin reorientation in "PbCrO3".

The perovskite "PbCrO(3)" was synthesized at high pressure and high temperature. Its magnetic properties have been investigated by means of magnetization, specific heat, and resistivity measurements. Earlier workers had concluded it to have a G-type antiferromagnetic structure.

E-cadherin, laminin and collagen IV expression in the evolution from dysplasia to oral squamous cell carcinoma.

Objectives: Study the loss or reduction of the cellular adhesion mediated for E-cadherin in oral leukoplakias, oral squamous cell carcinomas and metastatic nodules. Study the loss of continuity of the laminin and collagen IV expression in the epithelial basal membrane from the biological development of the oral leukoplakias and oral carcinomas.

Material And Method: we have studied 124 samples of patient pays leukoplakias and oral carcinomas with diverse diagnosis that embrace from normal epithelium (13 samples), mild dysplasias (2), moderate dysplasias (12), in situ carcinomas (13), microinvasive carcinomas (11) oral squamous cell carcinomas (64 samples) and metastatic nodules (9).

Proteic expression of p53 and cellular proliferation in oral leukoplakias.

Objectives: We intend to know the protein expression of genetic alterations that take place in the early stages in the field cancerization of oral cavity in our means as well as to study the cellular proliferation by means of Ki-67 and the protein product expression of p53 to value if the alterations in the protein products expression of these markers happen in a sequential pathway through the different stages in the field cancerization of oral cavity.

Materials And Methods: A study was made by immunohistochemistry on 53 patients that presented lesions of oral leukoplaquia, assisted by the ENT service at University Hospital of Salamanca, from 1.990 up to 2000.