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Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials:Dimension and functionalization

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Chinese Journal of Chemical Engineering 2019年第4期27卷 912-919页

作者： miguel de la Luz-Asunción Eduardo E.Pérez-Ramírez Ana L.martínez-Hernández victor m.castano Víctor Sánchez-mendieta Carlos Velasco-Santos Facultad de Quimica Universidad Autonoma del Estado de Mexico Km. 12 de la carretera Toluca-Atlacomulco C.P. 50200 San Cayetano Toluca Estado de Mexico Mexico Tecnologico Nacional de mexico-Instituto Tecnologico de Queretaro Division de Estudios de Posgrado e Investigacion Av. Tecnologico s/n esq. GraL Mariano Escobedo Col. Centro Historico C.P. 76000 Santiago de Queretaro Queretaro Mexico Centro de Fisica Aplicada y Tecnologia Avanzada Universidad Nacional Autonoma de Mexico Boulevard Juriquilla 3001 Queretaro 76230 Mexico

The adsorption capacities for the removal of hexavalent chromium from aqueous solutions by six carbon nanomaterials have been evaluated. Single-walled and multi-walled carbon nanotubes as received and after oxidation treatment, graphene oxide and reduced graphene oxide are the materials with different dimension and functionalization compared in this research. Carbon nanotubes have been modified using hydrogen peroxide as oxidizing agent under microwave radiation. The oxidation treatment on carbon nanotubes has a positive effect increasing the adsorbent–adsorbate interaction. Rate-controlling mechanisms and equilibrium data are analyzed using non-linear models. Non-linear method is proposed as the most suitable method for determining the kinetic and equilibrium parameters. The values of adsorption energy(E) obtained from the Dubinin–Radushkevich isotherm,have been found around 0.371 and 0.870 k J·mol-1, indicating physical adsorption. Therefore, the pseudo-second order model represents better the kinetic experimental data. The results show that the Langmuir isotherm provides a slightly better fit to the experimental data compared with the Freundlich isotherm, indicating homogeneous distribution of active sites on carbon nanomaterials and monolayer adsorption. The separation factors RLare found in the range of 0–1, suggesting that the adsorption process is suitable for all adsorbents. The mechanisms for hexavalent chromium removal have been proposed as electrostatic interactions and hydrogen bonding.

关键词： Carbon nanotubes Graphene Adsorption Hexavalent chromium Kinetic

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Non-linear modeling of kinetic and equilibrium datafor the adsorption of hexavalent chromium by carbon nanomaterials:Dimension and functionalization

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Chinese Journal of Chemical Engineering 2019年第4期

作者： miguel de la Luz-Asunción Eduardo E.Pérez-Ramírez Ana L.martínez-Hernández victor m.castano Víctor Sánchez-mendieta Carlos Velasco-Santos

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Finite Element Analysis of Residual Stress and Distortion in an Eccentric Ring Induced by Quenching

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材料热处理学报 2004年第05B期25卷 746-751页

作者： LI m. victor Portland State University PO Box 751-ME Portland OR 97207-075J USA

The residual stresses and distortion induced by quenching in an eccentric ring were investigated in this study with finite element method. The ring was made of AISI 52100 steel. A fully coupled 3D temperature-displacement analysis was performed to simulate heat transfer, phase transformations, and mechanical stresses and strains during the heating and subsequent quenching processes. Commercial FEA package ABAQUS/Standard 6.4 was used for the analyses along with user subroutines developed by the authors to model the thermal and mechanical constitutive behavior. The simulation results show that transformation plasticity plays an important role on the residual stress distribution.

关键词：残余应力有限元分析变形偏心环相变塑性

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The Quotient Category of a Graded morita-Takeuchi Context

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Acta mathematica Sinica,English Series 2006年第1期22卷 123-130页

作者： F. castano IGLESIAS C. NASTASESCU Departamento de Estadistica y matemdtica Aplicada Universidad de Almeria 04120 Almeria Spain Facultatea de matematica Str. Academiei 14 RO-70109 Bucharest Romania

In this paper, we offer a graded equivalence between the quotient categories defined by any graded morita-Takeuchi context via certain modifications of the graded cotensor functors. As a consequence, we show a commutative diagram that establish the relation between the closed objects of the categories gr^c and m^C, where C is a graded coalgebra.

关键词： Graded coalgebra Graded morita context Quotient category

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Stepwise magnetization reversal of geometrically tuned in diameter Ni and FeCo bi-segmented nanowire arrays

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Nano Research 2019年第7期12卷 1547-1553页

作者： Ester m. Palmero miguel mendez Silvia Gonzalez Cristina Bran victor Vega manuel Vazquez victor m. Prida Institute of materials Science of madrid (ICmm-CSIC) Madrid 28049Spain Department of Physics University of OviedoFederico Garda Lorca 18Oviedo 33007Spain Division of Permanent magnets and Applications IMDEA NanoscienceMadrid 28049Spain

magnetization reversal processes of hexagonal dense arrays of bi-segmented Ni and Fe50Co50 nanowires consisting of two well defined diameters (45 and 80 nm) have been *** nanowires were grown inside of tailored pores of anodic alumina templates by combined anodization,atomic layer deposition (ALD) and electrodeposition *** experiments have allowed to identify their two-step magnetization reversal process ascribed to the respective segments of different *** is concluded from the differential susceptibility observed in the hysteresis loops,contrary to those for nanowires with homogeneous *** results are also confirmed by the first-order reversal curve (FORC) distribution diagrams,where an elongation parallel to the interaction axis around two coercive field values is obtained,which is correlated to the difference in diameter of the two *** well-defined two-step magnetization reversal process through the nanowire diameter design is thought to be very useful for the advanced control of the remagnetization in arrays of magnetic multidomain systems.

关键词： Bi-segmented nanowires nickel iron cobalt alloy stepwise magnetization reversal first-order reversal curve (FORC)

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Growth performance,haematology,serum biochemistry and meat quality characteristics of Japanese quail(Coturnix coturnix japonica)fed canola meal-based diets

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Animal Nutrition 2018年第1期4卷 37-43页

作者： Caven m.mnisi victor mlambo Department of Animal Science School of Agricultural SciencesFaculty of AgricultureScience and TechnologyNorth-West University Food Security and Safety Niche Area Faculty of AgricultureScience and TechnologyNorth-West University

The present study investigated the effect of partial replacement of soybean meal(Glycine max) with canola meal(Cm)(Brassica napus) on the growth performance,haematology,serum biochemistry and meat quality characteristics of female Japanese quails in a 35-day feeding *** hundred and forty6-week-old quails 158.28 ± 11.919 g were randomly allocated to 5 isonitrogenous and isoenergetic experimental diets: control diet(Cm0; with no Cm inclusion); Cm0 with 2.5%(Cm25),5.0%(Cm50),12.5%(Cm125) and 17.5%(Cm175) soybean meal replaced with *** weekly gain(AWG) and feed conversion efficiency(FCE) were ***,serum biochemistry,carcass traits and meat quality parameters were determined at *** fed Cm175 had the lowest(P mong the other 4 *** dietary effects on AWG,FCE and haematological parameters were *** biochemical parameters were not influenced by diets with the exception of alkaline phosphatase(ALP),where quails fed Cm25 had higher ALP(161.0 U/L) than those fed Cm0(37.25 U/L).Quails fed Cm25 had the highest chroma(7.39) while those fed Cm125 had the lowest(3.58) at 24 h *** had no influence(P > 0.05) on cooking losses and peak positive force of quail *** was concluded that Cm can replace soybean in quail diets up to 12.5% without compromising growth performance,health and quality of *** levels beyond 12.5% promoted poor voluntary feed intake and thus may require feed additives to enhance utilization.

关键词： Japanese quail Haematology meat Feed intake Canola meal

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Cryotic climate conditions and their eventual implication in the high-mountain surface of the Nevado de Toluca volcano, mexico

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Journal of mountain Science 2021年第9期18卷 2273-2286页

作者： SOTO victor Facultad de Ciencias Biológicas y Agropecuarias Universidad VeracruzanaPoza Rica-Tuxpan 92870México

The state of the cryosphere in tropical regions is of great importance because the temperature around the glaciers, permafrost and snow cover always fluctuates near the melting point. These thermal conditions and their high sensitivity to climate change cause the accelerated disappearance of these elements;therefore, it is important to know the climatic factors that regulate them, as well as the physical characteristics of each cryospheric element. Unlike glaciers, permafrost and snow cover have not been widely studied. In recent decades, the study of the glacial and periglacial environment has been carried out in intertropical mountains. However, despite the altitude of their relief and the frequent occurrence of snowfall in tropical high mountains, the conditions that determine such events have been barely analyzed;and in the case of mexico, the volume of snowfall and its thickness have not been quantified either, as well as their corresponding duration. Consequently, this work is aimed to analyze the temperature and precipitation conditions that determine the snowfall at the higher part of the Nevado de Toluca volcano;at the same time, the conditions of the cryotic climate and their possible implication on the surface are studied. The analysis of data from 1965 to 2016, using frequency statistics, allowed to realize that snowfall occurs with low intensity, its accumulation being less than 10 cm thick and 10 mm of snow water equivalent, which causes the snowpack to stay only a few weeks on average. At the same time, it was determined that there is a significant increase in the number of freeze-thaw cycles. Therefore, due to the climate conditions and their influence on the mountain surface, it is probable that the bedrock is subject to a greater gelifraction dynamics, and the unconsolidated soil surface increases;the combination of the above could cause a greater geomorphological dynamic over time, particularly due to debris flows, and by water and wind erosion of

关键词： Air temperature Cryotic conditions High-mountain climatology Periglacial geomorphology Snow precipitation

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Brain-derived neurotrophic factor signaling in the neuromuscular junction during developmental axonal competition and synapse elimination

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Neural Regeneration Research 2025年第2期20卷 394-401页

作者： Josep Tomàs Víctor Cilleros-mañé Laia Just-Borràs marta Balanyà-Segura Aleksandra Polishchuk Laura Nadal marta Tomàs Carolina Silvera-Simón manel m.Santafé maria A.Lanuza Unitat d’Histologia i Neurobiologia(UHNeurob) Facultat de Medicina i Ciències de la SalutUniversitat Rovira i VirgiliReusSpain

During the development of the nervous system,there is an overproduction of neurons and *** competition between neighboring nerve endings and synapses performing different activity levels leads to their elimination or *** have extensively studied the involvement of the brain-derived neurotrophic factor-Tropomyosin-related kinase B receptor neurotrophic retrograde pathway,at the neuromuscular junction,in the axonal development and synapse elimination process versus the synapse *** purpose of this review is to describe the neurotrophic influence on developmental synapse elimination,in relation to other molecular pathways that we and others have found to regulate this *** particular,we summarize our published results based on transmitter release analysis and axonal counts to show the different involvement of the presynaptic acetylcholine muscarinic autoreceptors,coupled to downstream serine-threonine protein kinases A and C(PKA and PKC)and voltage-gated calcium channels,at different nerve endings in developmental *** dynamic changes that occur simultaneously in several nerve terminals and synapses converge across a postsynaptic site,influence each other,and require careful studies to individualize the mechanisms of specific *** describe an activity-dependent balance(related to the extent of transmitter release)between the presynaptic muscarinic subtypes and the neurotrophin-mediated TrkB/p75NTR pathways that can influence the timing and fate of the competitive interactions between the different axon *** downstream displacement of the PKA/PKC activity ratio to lower values,both in competing nerve terminals and at postsynaptic sites,plays a relevant role in controlling the elimination of supernumerary ***,calcium entry through L-and P/Q-subtypes of voltage-gated calcium channels(both channels are present,together with the N-type channel in developing nerve terminals)contributes to red

关键词： acetylcholine release adenosine receptors axonal competition brain-derived neurotrophic factor calcium channels motor end-plate muscarinic acetylcholine receptors postnatal synapse elimination serine kinases tropomyosin-related kinase receptorB

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Cancer cells escape the immune system by increasing stemness through epigenetic reprogramming

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Cellular & molecular Immunology 2023年第1期20卷 6-7页

作者： Jose A.Costoya victor m.Arce molecular Oncology Laboratory mOL Departamento de FisioloxíaCentro Singular de Investigación en Medicina Molecular e Enfermidades Crónicas(CiMUS)Facultade de MedicinaUniversidade de Santiago de CompostelaInstituto de Investigación Sanitaria de Santiago de Compostela(IDIS)15782Santiago de CompostelaSpain

Cancer stem cells(CSCs),also known as tumor initiating cells,are a minority subpopulation of undifferentiated cancerous cells within the entire tumor that hold self-renewal capacity and differentiation *** are critical for tumor progression,heterogeneity and metastasis and play a major role in chemo-and radiation-resistance and tumor recurrence[1].Although the molecular mechanisms underlying the ability of CSCs to give rise to new tumors and promote resistance to many cancer therapies are not completely understood,increasing knowledge suggests potential roles for these cells in the evasion of immune surveillance[2,3].

关键词： Cancer programming initiating

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New insights into the relevance of mobile DNA to cancer resistance in blind mole rats:new lessons for cancer therapy

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Cellular & molecular Immunology 2022年第4期19卷 458-459页

作者： victor m.Arce Jose A.Costoya molecular Oncology Laboratory mOL Departamento de FisioloxíaCentro Singular de Investigación en Medicina Molecular e Enfermidades Crónicas(CiMUS)Facultade de MedicinaUniversidade de Santiago de CompostelaInstituto de Investigación Sanitaria de Santiago de Compostela(IDIS)15782Santiago de CompostelaSpain

Although mammals differ substantially in their cancer incidence rates and in the importance of age as a cancer risk factor,there is a scaling of cancer incidence to the lifespan in most *** evolution has selected strategies that maximize reproductive success,which include the development of efficient mechanisms to defer the initiation of cancer until postreproductive age[1].Owing to this,cancers are very rare among wild animals(which do not typically live beyond their reproductive ages).

关键词： cancer insight resistance

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