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Ramirez-Gonzalez, Daniel,Cruz-Rivera, Jose de J.,Tiznado, Hugo,Rodriguez, Angel G.,Guillen-Escamilla, Ivan,Zamudio-Ojeda, Adalberto Techno-Press 2020 Advances in nano research Vol.9 No.1
In this work, we report the use of caffeine as an alternative source of nitrogen to successfully dope graphene (quaternary 400.6 eV and pyridinic at 398 eV according XPS), as well as the growth of silver nanowires (in-situ) in the surface of nitrogen doped graphene (NG) sheets. We used the improved graphene oxide method (IGO), chemical reduction of graphene oxide (GOx), and impregnation with caffeine as source of nitrogen for doping and subsequently, silver nanowires (NW) grow in the surface by the reduction of silver salts in the presence of NG, achieving a numerous of growth of NW in the graphene sheets. As supporting experimental evidence, the samples were analyzed using conventional characterization techniques: SEM-EDX, XRD, FT-IR, micro RAMAN, TEM, and XPS.
On the steel cost of circular flat-bottomed silos designed using the Eurocodes
Gonzalez-Montellano, Carlos,Ramirez, Alvaro,Gallego, Eutiquio,Ayuga, Francisco Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.5
Nowadays, Eurocodes have become the reference standards for silo design within the European Union. They include new procedures for load assessment and structural verifications aiming to design safer silos. However, many silo manufacturers are still reluctant to use them (or at least all their prescriptions) because of the loss of competitiveness they are experiencing in comparison with former standards. This paper shows how steel cost of flat-bottomed circular silos varies when different silo geometries and stored materials are considered. The influence of critical structural verifications on steel costs, such as buckling of the silo wall, were also analyzed and some conclusions and practical recommendations for silo designers were proposed.
Sources, Characteristics, and Therapeutic Applications of Mesenchymal Cells in Tissue Engineering
Gonzalez-Vilchis Rosa Angelica,Piedra-Ramirez Angelica,Patiño-Morales Carlos Cesar,Sanchez-Gomez Concepcion,Beltran-Vargas Nohra E. 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.2
Tissue engineering (TE) is a therapeutic option within regenerative medicine that allows to mimic the original cell environment and functional organization of the cell types necessary for the recovery or regeneration of damaged tissue using cell sources, scaffolds, and bioreactors. Among the cell sources, the utilization of mesenchymal cells (MSCs) has gained great interest because these multipotent cells are capable of differentiating into diverse tissues, in addition to their self-renewal capacity to maintain their cell population, thus representing a therapeutic alternative for those diseases that can only be controlled with palliative treatments. This review aimed to summarize the state of the art of the main sources of MSCs as well as particular characteristics of each subtype and applications of MSCs in TE in seven different areas (neural, osseous, epithelial, cartilage, osteochondral, muscle, and cardiac) with a systemic revision of advances made in the last 10 years. It was observed that bone marrow-derived MSCs are the principal type of MSCs used in TE, and the most commonly employed techniques for MSCs characterization are immunodetection techniques. Moreover, the utilization of natural biomaterials is higher (41.96%) than that of synthetic biomaterials (18.75%) for the construction of the scaffolds in which cells are seeded. Further, this review shows alternatives of MSCs derived from other tissues and diverse strategies that can improve this area of regenerative medicine.
On the steel cost of circular flat-bottomed silos designed using the Eurocodes
Carlos Gonzalez-Montellano,Alvaro Ramirez,Eutiquio Gallego,Francisco Ayuga 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.5
Nowadays, Eurocodes have become the reference standards for silo design within the European Union. They include new procedures for load assessment and structural verifications aiming to design safer silos. However, many silo manufacturers are still reluctant to use them (or at least all their prescriptions) because of the loss of competitiveness they are experiencing in comparison with former standards. This paper shows how steel cost of flat-bottomed circular silos varies when different silo geometries and stored materials are considered. The influence of critical structural verifications on steel costs, such as buckling of the silo wall, were also analyzed and some conclusions and practical recommendations for silo designers were proposed.
Antifibrotic Effects of (ㅡ)-Epicatechin on High Glucose Stimulated Cardiac Fibroblasts
Alejandra Garate-Carrillo,Israel Ramirez-Sanchez,Justina Nguyen,Julisa Gonzalez,Guillermo Ceballos,Francisco Villarreal 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.11
Cardiac fibrosis is one of the hallmarks of a diabetic cardiomyopathy. When activated, cardiac fibroblasts (CFs) increase the production of extracellular matrix proteins. Transforming growth factor (TGF)-β1 is known to mediate cardiac fibrosis through the SMAD pathway. High glucose (HG = 25 mM) cell culture media can activate CFs using TGF-β1. There is a need to identify effective antifibrotic agents. Studies in animals indicate that treatment with (−)-epicatechin (Epi) appears capable of reducing myocardial fibrosis. Epi binds to G-protein coupled estrogen receptor (GPER) and activates downstream pathways. We evaluated the potential of Epi to mitigate the development of a profibrotic phenotype in HG stimulated CFs. CF primary cultures were isolated from young male rats and were exposed for up to 48 h HG media and treated with vehicle or 1 μM Epi. Relevant profibrotic end points were measured by the use of various biochemical assays. HG exposure of CFs increased TGF-β1 protein levels by ∼15%, fibronectin ∼25%, urea levels ∼60%, proline incorporation ∼70%, and total collagen ∼15%. Epi treatment was able to significantly block HG induced increases in TGF-β1, fibronectin, urea, proline, and total collagen protein levels. GPER levels were reduced by HG and restored in CFs treated with Epi an effect associated with the activation (i.e., phosphorylation) of c-Src. Epi treatment also reverted SMAD levels. Altogether, results demonstrate that CFs cultured in HG acquire a profibrotic phenotype, which is blocked by Epi an effect, likely mediated at least, in part, by GPER effects on the SMAD/TGF-β1 pathway.
Impact of Cassia acutifolia Infusion on Glucose Levels in Obesity and Diabetes Rat Model
Raffoul-Orozco, Abdel Kerim,Avila-Gonzalez, Ana Elisa,Barajas-Vega, Jessica Lucia,Rodriguez-Razon, Christian Martin,Garcia-Cobian, Teresa Arcelia,Ramirez-Lizardo, Ernesto Javier,Rubio Arellano, Edy Da KOREAN PHARMACOPUNCTURE INSTITUTE 2017 Journal of pharmacopuncture Vol.20 No.3
Objectives: The aim of this study was to investigate the effects of Cassia acutifolia on the obesity and the glucose levels in a rat model of obesity and diabetes. Methods: By random selection, 36 Wistar male rats were divided in two control groups, the positive and the negative control groups, and into four experimental groups receiving different infusions of Cassia acutifolia in water ad libitum. Results: The results revealed a statistically significant anti-obesogenic effect (P = 0.02), although this was not considered clinically significant. Additionally, Cassia acutifolia lowered the glucose levels by 30 mg/dL to 90 mg/dL (P = 0.05). However, we observed adverse effects in the liver, a two-fold increase in transaminase levels (P = 0.002), and in the kidneys, decreased creatinine levels (P = 0.001), and these adverse effects had no viable explanation. Conclusion: Cassia acutifolia has anti-hyperglycemic effects in obese diabetic rats. However, Cassia acutifolia also has adverse effects, so it should not be administered to patients.
Generalized Quadrature Spatial Modulation Scheme Using Antenna Grouping
Francisco Ruben Castillo-Soria,Joaquın Cortez-Gonzalez,Raymundo Ramirez-Gutierrez,Fermın Marcelo Maciel-Barboza,Leonel Soriano-Equigua 한국전자통신연구원 2017 ETRI Journal Vol.39 No.5
This paper presents a novel generalized quadrature spatial modulation (GQSM) transmission scheme using antenna grouping. The proposed GQSM scheme combines QSM and conventional spatial multiplexing (SMux) techniques in order to improve the spectral efficiency (SE) of the system. Analytical and simulation results show that the proposed transmission scheme has minimal losses in terms of the average bit error probability along with the advantage of an increased SE compared with previous SM and QSM schemes. For the case studies, this advantage represents a reduction of up to 81% in terms of the number of required transmit antennas compared with QSM. In addition, a detection architecture based on the ordered successive interference cancellation scheme and the QR decomposition is presented. The proposed QRD-M adaptive algorithm showed a near-maximum-likelihood performance with a complexity reduction of approximately 90%.
Solidification Kinetics of a Near Eutectic Al-Si Alloy, Unmodified and Modified with Sr
R. Aparicio,G. Barrera,G. Trapaga,M. Ramirez-Argaez,C. Gonzalez-Rivera 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
The purpose of this work was to explore the differences in solidification kinetics between unmodified and Sr modified eutectic Al-Si alloy as revealed by Fourier Thermal Analysis (FTA) and grain-growth kinetics characterization. Thermal analysis were performed in cylindrical stainless steel cups coated with a thin layer of boron nitride, using two type-K thermocouples connected to a data acquisition system. Grain growth kinetics characterization was carried out using solid fraction evolution and grain density data. FTA results for the non modified and modified alloys suggest that there are changes in the solidification rate during eutectic nucleation followed, during growth, by similar solidification rate evolutions, suggesting that this parameter is governed principally by the heat extraction conditions. On the other hand the change of the grain growth parameters estimated for the experimental probes suggest that the presence of Sr may modify the relationship between grain growth rate and undercooling in eutectic Al-Si.
Design of Two-Stage Class AB CMOS Buffers: A Systematic Approach
Antonio Lopez Martin,Jose Maria Algueta Algueta,Lucia Acosta,Jaime Ramirez-Angulo,Ramon Gonzalez Carvajal 한국전자통신연구원 2011 ETRI Journal Vol.33 No.3
A systematic approach for the design of two-stage class AB CMOS unity-gain buffers is proposed. It is based on the inclusion of a class AB operation to class A Miller amplifier topologies in unity-gain negative feedback by a simple technique that does not modify quiescent currents, supply requirements, noise performance, or static power. Three design examples are fabricated in a 0.5 μm CMOS process. Measurement results show slew rate improvement factors of approximately 100 for the class AB buffers versus their class A counterparts for the same quiescent power consumption (< 200 μW).
Establishment of the Latin American Soil Information System Case Colombia - IRAKA
Araujo-Carrillo Gustavo Alfons,Martinez-Maldonado Fabio Ernes,Varon-Ramirez Viviana Marcela,Gomez-Latorre Douglas Andres,Estupinan-Casallas Jhon Mauric,Silva-Arero Elias Alexander,Gonzalez-Jaimes Edua 한국토양비료학회 2019 한국토양비료학회 학술발표회 초록집 Vol.2019 No.8