检索结果-南通市图书馆

Structural Analysis of TiC and TiC-C Core-Shell Nanostructures Produced by Pulsed-Laser Ablation

Journal of Materials Science and Chemical Engineering 2023年第7期11卷 1-13页

作者： Luis Enrique Iniesta Piña Miguel Ángel Camacho López rafael vilchis Néstor Víctor Hugo Castrejón Sánchez Delfino Reyes Contreras Mestría en Ciencia de Materiales Facultad de Química Campus Rosedal Universidad Autónoma del Estado de México Toluca México Laboratorio de Fotomedicina Biofotónica y Espectroscopía Láser de Pulsos Ultracortos Facultad de Medicina Universidad Autónoma del Estado de México Toluca México Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM Toluca México TecNM/Tecnológico de Estudios Superiores de Jocotitlán Jocotitlán México Laboratorio de Acústica y Nanomateriales Facultad de Ciencias Campus el Cerrillo Universidad Autónoma del Estado de México Toluca México

This paper reports on the ablation process of a pure Ti solid target immersed in a C-enriched acetone solution, leading to the production of titanium carbide (TiC) and Ti-C core-shell nanostructures. The used route of synthesis is generally called pulsed laser ablation in liquid (PLAL). The presence of carbon structures in the solution contributed to the carbon content in the produced Ti-based nanomaterials. The atomic composition of the produced nanostructures was analyzed using SEM-EDS, while TEM micrographs revealed the formation of spherical TiC and core-shell nanostructures ranging from 40 to 100 nm. The identification of atomic planes by HRTEM confirmed a 10 nm diameter C-shell with a graphite structure surrounding the Ti-core. Raman spectroscopy allowed for the identification of D and G peaks for graphite and a Raman signal at 380 and 600 cm−1, assigned to TiC. The results contribute to the state-of-the-art production of TiC and Ti-C core-shell nanostructures using the PLAL route.

关键词： Laser Ablation TiC Nanoparticles Core-Shell Nanoparticles Pulsed Laser

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Efficacy and long-term evaluation of intramyocardial injection of autologous CD34-enriched PBMSC in old myocardial infarction

引用

World Journal of Cardiovascular Diseases 2012年第4期2卷 283-290页

作者： Jose Luis Aceves Abel Archundia Araceli Paez rafael vilchis Elvira Varela Emma Rodriguez Guillermo Diaz Lourdes Flores-Luna Martha Alvarado Manuel Lopez Hernandez Luis Felipe Montano Felipe Masso Department of Cardiovascular Surgery National Medic Center 20 de Noviembre ISSSTEMexico CityMexico Department of Cellular Physiology National Institute of Cardiology“Ignacio Chavez”Mexico CityMexico Center of Population Health Research National Institute of Public HealthMexico CityMexico Department of Hematology National Medic Center 20 de Noviembre ISSSTEMexico CityMexico Immunobiology Laboratory Department of Cell and Tissue BiologySchool of Medicine UNAMMexico CityMexico

Aims: We have shown that autologous transplant of CD34+-enriched peripheral-blood mononuclear cells (PBMSC) could restore depressed myocardial function, and sustain adequate myocardial function 12 months after surgery in patients with old (>one year-old) myocardial infarction. Our aim is to report the long-term morbidity and mortality efficacy of this procedure. Methods and results: Seventy patients with an old anteroseptal myocardial infarction were followed for 2 to 7 years, 35 had a revascularization procedure and received an intra-myocardial injection of autologous CD34+-enriched PBMSC (8 × 108 mononuclear cells/ml including 3 × 107 CD34+ cells/ml)(Group A). Group B patients only had the revascularization. Abnormal pre-surgical values of LVEF (33.2% ± 4.8%), LVDV (178 ± 13.7 ml), LVSV (120 ± 16 m), LVDD (58.9 ± 3.84 mm), E and A waves without contractility in infarction area in group A patients improved to approximate normal values (50% ± 3% for LVEF;90 ± 9.3 ml for LVDV;80 ± 9.9 ml for LVSV;55.3 ± 3 mm for LVDD;5.2 ± 0.5 cm/s for E wave and 4.18 ± 0.3 cm/s for A wave) 1 year after the procedure and have remained unaltered for all the follow-up period. All the patients remain alive. Only seven patients have been readmitted to the hospital for non-myocardial related events. Group B only 11 patients continued alive to 5 years after surgery and LEVF never increased more than 6%, all of them with many hospitalizations (n ≥ 10) by heart failure events. Conclusion: Intramyocardial injection of CD34+ highly enriched PBSC represent an encouraging alternative for patients with severely scarred and dysfunctional myocardium.

关键词： Stem Cells Myocardial Infarction CD34+ Cells Revascularization Heart Failure Ventricular Function

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CXCR4+ and SDF-1+ Bone Marrow Cells Are Mobilized into the Blood Stream in Acute Myocardial Infarction and Acute Ischemia

引用

World Journal of Cardiovascular Diseases 2014年第7期4卷 361-367页

作者： Jose Luis Aceves rafael vilchis Maria Antonieta Medina Monserrat Borja Silvia Cortes Guillermo Diaz Armando Castro Alexis Gomez Jose JParra Martha Alvarado Manuel Lopez Hernandez Virna Poveda Felipe Masso Luis FMontano Division de Cardiocirugia Centro Medico Nacional 20 de Noviembre ISSSTEMexico DFMexico Departamento de Hematologia Centro Medico Nacional 20 de Noviembre ISSSTEMexico DFMexico Laboratorio de Hormonas Centro Medico Nacional 20 de Noviembre ISSSTEMexico DFMexico Departamento de Inmunobiologia Biologia Celular y Tisular Facultad de Medicina UNAMMexico DFMexico

Cell therapy has shown beneficial effects on ventricular function and tissue regeneration in patients with acute and chronic myocardial infarction, although with diverse grades of variability in the results, possibly by proportion, subtype and cell cycle status. Objective: Identify and phenotypically characterize, via CXCR4 and SDF-1 expression, the bone marrow cell subpopulations that are mobilized into the bloodstream in patients with Acute Myocardial Infarction (AMI) and Acute Ischemia (AI) such as acute angina and Chronic Ischemia (CI) such as chronic stable angina, and also determine the cell cycle status of these cells. Method: Patients with AMI and AI were recruited in the ICCU, and patients with CI in the departments of cardiology and cardiovascular surgery. The quantification of cellular subpopulations was made by cytofluorometry with a FACS caliburcyto fluorometry (Becton Dickinson) with specific FITC-labeled anti human monoclonal antibodies against CD34, CD133, CD117, CD48, CXCR4, SDF-1 and Ki67 (Becton Dickinson). Serum concentration of IL-6 and IL-8 were determined by a sequential solid phase chemiluminescent assay performed in a SIEMENS IMMULITE 1000 Analyzer. Statistical analysis was made with the SPSS version 20.0 for Windows. A p value 3/ml) than that in AI (9.2 ± 1.3 × 103/ml) and CI (6.6 ± 1.1 × 103/ml) patients (p p = 0.22 to 0.39), but interestingly in AMI and AI patients, cells were CXCR4+ in almost half of these mobilized cells, although the proportion was significantly higher in AMI patients (46.8% ± 7.1% to 55.7% ± 6.3% vs 23% ± 1.6% to 28.4% ± 2.1%, p = 0.03 to 0.05). A similar behavior was observed with the Ki67 antibody (29.9% ± 2.1% to 36.1% ± 6.3% vs 10% ± 1.2% to 24% ± 1.1%, p = 0.001 to 0.05). Bivariate analysis of the results showed a significant correlation of the cell proportion in AMI but not in AI and CI patients (p = 0.001 to 0.05;0.12 to 0.87 and 0.17 to 0.92 respectively). The amount of myocardial tissue infarcted did not show

关键词： Stem Cells CXCR4:SDF-1 Axis Cardiac Repair Acute and Chronic Ischemia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Efficacy and long-term evaluation of intramyocardial injection of autologous CD34-enriched PBMSC in old myocardial infarction

引用

World Journal of Cardiovascular Diseases（心血管病） 2012年第4期

作者： José Luis Aceves Abel Archundia Araceli Páez rafael vilchis Elvira Varela Emma Rodriguez Guillermo Diaz Lourdes Flores-Luna Martha Alvarado Manuel Lopez H. Luis Felipe Monta？o Felipe Masso

来源：评论

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：