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Electric,magnetic and microstructural features of the La_(2)CoFeO_(6) lanthanide ferrocobaltite obtained by the modified Pechini route

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Journal of Advanced Dielectrics 2021年第3期11卷 16-25页

作者： J.A.Jaramillo Palacio k.a.munoz pulido J.Arbey Rodríguez D.A.Landínez Téllez J.Roa-Rojas Grupo de Física de Nuevos Materiales Departamento de Física Universidad Nacional de ColombiaBogotáDCColombia Laboratório de Magnetismo e Materiais Magnéticos Departamento de Física Universidade Federal de Santa Maria Rio Grande do Sul Brazil Grupo de Estudios de Materiales Departamento de Física Universidad Nacional de ColombiaBogotáDCColombia

In the search for new materials with applicable magnetic properties in spintronic devices,the aim of this work is to report the synthesis of the lanthanide ferrocobaltite La_(2)CoFeO_(6) using the modified Pechini route;the experimental study of structural,morphological and magnetic properties,and the analysis of the electronic structure and bands are obtained in the framework of the Density Functional *** refinement of experimental X-ray diffraction patterns revealed the crystallization of this oxide material in a perovskite-like monoclinic structure,space group P2_(1)/n(#14).Scanning electron microscopy and atomic force microscopy images revealed that the surface morphology is essentially polycrystalline,with mean grain sizes between 177 and 188 *** dispersive X-ray spectroscopy suggests that the material obtained contains La,Fe,Co and O in the stoichiometric proportions expected by up to 98%.The magnetic susceptibility curves as a function of temperature indicated that the material is ordered ferromagnetically,showing strong irreversibility effects due to the disorder of the Fe and Co cations in the three crystallographic directions of the structure and to the strong distortions in the FeO_(6) and CoO_(6) *** hysteresis curves confirmed the ferromagnetic character of the material for all temperatures evaluated,up to room temperature.I-V response curves revealed a semiconductor-like behavior with a figure of merit exponent 1.53 of the varistor *** ferromagnetic semiconductor behavior suggests the potential applicability of the material in spintronic technological devices.

关键词： Double perovskite Pechini method crystalline structure ferromagnetic response semiconductor behavior

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Risk factors and classifications of hilar cholangiocarcinoma

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World Journal of Gastrointestinal Oncology 2013年第7期5卷 132-138页

作者： Miguel Angel Suarez-munoz Jose Luis Fernandez-Aguilar Belinda Sanchez-Perez Jose Antonio Perez-Daga Beatriz Garcia-Albiach Ysabel pulido-Roa Naiara Marin-Camero Julio Santoyo-Santoyo General Digestive and Transplantation Surgery Service HPB and Liver Transplant UnitUniversity Hospital Carlos Haya29010 MalagaSpain

Cholangiocarcinoma is the second most common primary malignant tumor of the *** cholangiocarcinoma or klatskin tumor represents more than 50% of all biliary tract cholangiocarcinomas.A wide range of risk factors have been identified among patients with Perihilar cholangiocarcinoma including advanced age,male gender,primary sclerosing cholangitis,choledochal cysts,cholelithiasis,cholecystitis,parasitic infection(Opisthorchis viverrini and Clonorchis sinensis),inflammatory bowel disease,alcoholic cirrhosis,nonalcoholic cirrhosis,chronic pancreatitis and metabolic *** classifications have been used to describe the pathologic and radiologic appearance of *** three systems most commonly used to evaluate Perihilar cholangiocarcinoma are the Bismuth-Corlette(BC) system,the Memorial Sloan-kettering Cancer Center and the TNM *** BC classification provides preoperative assessment of local *** Memorial Sloan-kettering cancer center proposes a staging system according to three factors related to local tumor extent:the location and extent of bile duct involvement,the presence or absence of portal venous invasion,and the presence or absence of hepatic lobar *** TNM classification,besides the usual descriptors,tumor,node and metastases,provides additional information concerning the possibility for the residual tumor(R) and the histological grade(G).Recently,in 2011,a new consensus classification for the Perihilar cholangiocarcinoma had been *** consensus was organised by the European Hepato-PancreatoBiliary Association which identified the need for a new staging system for this type of *** classification includes information concerning biliary or vascular(portal or arterial) involvement,lymph node status or metastases,but also other essential aspects related to the surgical risk,such as remnant hepatic volume or the possibility of underlying disease.

关键词： Hilar cholangiocarcinoma klatskin tumor Perihilar cholangiocarcinoma Bile duct cancer

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Analyzing predictors of graft survival in patients undergoing liver transplantation with donors aged 70 years and over

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World Journal of Gastroenterology 2018年第47期24卷 5391-5402页

作者： Oscar Caso-Maestro Carlos Jiménez-Romero Iago Justo-Alonso Jorge Calvo-pulido David Lora-Pablos Alberto Marcacuzco-Quinto Félix Cambra-Molero Alvaro García-Sesma Marina Pérez-Flecha Carlos munoz- Arce Carmelo Loinaz-Segurola Alejandro Manrique-Municio Unit of HBP Surgery and Abdominal Organs Transplantation Department of General Surgery“12 de octubre” University HospitalMadrid 28041Spain Clinical Research Department Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP)“12 de octubre” University HospitalMadrid 28041Spain

AIM To increase the number of available *** This is a single-center comparative analysis performed between April 1986 and May 2016. Two hundred and twelve liver transplantation(LT) were performed with donors ≥ 70 years old(study group). Then, we selected the first cases that were performed with donors k of complications, especially primary non-function, vascular complications and biliary complications. We identified 5 risk factors as independent predictors of graft survival: recipient hepatitis C virus(HCV)-positivity [hazard ratio(HR) = 2.35; 95% confidence interval(CI): 1.55-3.56; P = 0.00]; recipient age(HR = 1.04; 95%CI: 1.02-1.06; P = 0.00); donor age X model for end-stage liver disease(D-MELD)(HR = 1.00; 95%CI: 1.00-1.00; P = 0.00); donor value of serum glutamic-pyruvic transaminase(HR = 1.00; 95%CI: 1.00-1.00; P = 0.00); and donor value of serum sodium(HR = 0.96; 95%CI: 0.94-0.99; P = 0.00). After combining D-MELD and recipient age we obtained a new scoring system that we called DR-MELD(donor age X recipient age X MELD). Graft survival significantly decreased in patients with a DR-MELD score ≥ 75000, especially in HCV patients(77% vs 63% at 5 years in HCV-negative patients, P = 0.00; and 61% vs 25% at 5 years in HCV-positive patients; P = 0.00). CONCLUSION A DR-MELD ≥ 75000 must be avoided in order to obtain the best results in LT with donors ≥ 70 years old.

关键词： Liver transplantation Aged donors Old donors Marginal donors Donor age

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