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Development and postnatal neurogenesis in the retina: a comparison between altricial and precocial bird species

Neural Regeneration Research 2021年第1期16卷 16-20页

作者： Guadalupe Álvarez-Hernán José Antonio de mera-rodríguez Yolanda Gañán Jorge Solana-Fajardo Gervasio martín-Partido Joaquín rodríguez-León Javier Francisco-morcillo Área de Biología Celular Departamento de AnatomíaBiología Celular y ZoologíaFacultad de CienciasUniversidad de ExtremaduraBadajozSpain Área de Anatomía Humana Departamento de AnatomíaBiología Celular y ZoologíaFacultad de MedicinaUniversidad de ExtremaduraBadajozSpain Servicio de Oftalmología Complejo Hospitalario Universitario de BadajozBadajozSpain

The visual system is affected by neurodegenerative diseases caused by the degeneration of specific retinal neurons,the leading cause of irreversible blindness in *** vertebrate phylogeny,the retina has two kinds of specialized niches of constitutive neurogenesis:the retinal progenitors located in the circumferential marginal zone and müller *** proliferative activity in the retinal progenitors located in the circumferential marginal zone in precocial birds such as the chicken,the commonest bird model used in developmental and regenerative studies,is very *** region adds only a few retinal cells to the peripheral edge of the retina during several months after hatching,but does not seem to be involved in retinal regeneration.müller cells in the chicken retina are not proliferative under physiological conditions,but after acute damage some of them undergo a reprogramming event,dedifferentiating into retinal stem cells and generating new retinal ***,regenerative response after injury occurs with low efficiency in the precocial avian *** contrast,it has recently been shown that neurogenesis is intense in the retina of altricial birds at *** particular,abundant proliferative activity is detected both in the circumferential marginal zone and in the outer half of the inner nuclear ***,stem cell niches are very active in the retina of altricial *** more extensive research is needed to assess the potential of proliferating cells in the adult retina of altricial birds,it emerges as an attractive model for studying different aspects of neurogenesis and neural regeneration in vertebrates.

关键词： altricial birds circumferential marginal zone müller glia postnatal neurogenesis precocial regeneration retinogenesis

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A maschke Type Theorem for Weak Hopf Algebras

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Acta mathematica Sinica,English Series 2008年第12期24卷 2065-2080页

作者： J.N.ALONSOLVAREZ J.m.FERNNDEZVILABOA R.GONZLEZrodríguez A.B.rodríguezRAPOSO Departamento de matemáticas Universidad de Vigo. Lagoas-Marcosende Vigo. E-36200 Spain Departamento de lxebra. Universidad de Santiago de Compostela Santiago de Compostela. E-15771 Spain Departamento de matemdtica Aplicada Ⅱ. Universidad de Vigo. Lagoas-Marcosende Vigo. E-36310 Spain Departamento delxebra Universidad de Santiago de CompostelaSantiago de Compostela E-15771 Spain

In this paper, we give a necessary and sufficient condition for a comodule algebra over a weak Hopf algebra to have a total integral, thus extending the classical theory developed by Doi in the Hopf algebra setting. Also, from these results, we deduce a version of maschke＇s Theorem for （H, B）-Hopf modules associated with a weak Hopf algebra H and a right H-comodule algebra B.

关键词： monoidal category weak Hopf algebra Hopf modules maschke Theorem

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Efficacy of medium-chain fatty acid salts distilled from coconut oil against two enteric pathogen challenges in weanling piglets

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Journal of Animal Science and Biotechnology 2020年第1期11卷 251-267页

作者： Paola López-Colom Lorena Castillejos Agustina rodríguez-Sorrento mónica Puyalto Juan Josémallo Susana maría martín-Orúe Animal Nutrition and Welfare Service Animal and Food Science DepartmentFacultat de VeterinàriaUniversitat Autònoma de BarcelonaBellaterraSpain Norel S.A MadridSpain.

Background:The search for alternatives to antibiotics in pig production has increased the interest in natural resources with antimicrobial properties,such as medium-chain fatty acids(mCFA)as in-feed *** study evaluated the potential of a novel blend of mCFA salts(DIC)from distilled coconut oil with a lauric acid content to reduce enteropathogens and control intestinal diseases around *** experimental disease models were implemented in early-weaned piglets,consisting of two oral challenges:Salmonella Typhimurium(1.2×10~8 CFU)or enterotoxigenic Escherichia coli(ETEC)F4(1.5×10~9 CFU).The parameters assessed were:animal performance,clinical signs,pathogen excretion,intestinal fermentation,immune-inflammatory response,and intestinal ***:The Salmonella challenge promoted an acute course of diarrhea,with most of the parameters responding to the challenge,whereas the ETEC F4 challenge promoted a mild clinical course.A consistent antipathogenic effect of DIC was observed in both trials in the hindgut,with reductions in Salmonella *** counts in the cecum(P=0.03)on d 8 post-inoculation(PI)(Salmonella trial),and of enterobacteria and total coliform counts in the ileum and colon(Pmicrobiota(16 S rRNA gene sequencing),this additive tended(P=0.13)to reduce the Firmicutes/Bacteroidetes ratio and enriched Fibrobacteres after the Salmonella *** the ETEC F4 challenge,DIC prompted structural changes in the ecosystem with increases in Dialister,and a trend(P=0.14)to increase the Veillonellaceae *** parameters such as the intestinal fermentation products or serum pro-inflammatory mediators were not modified by DIC supplementation,nor were the histological *** the intraepithelial lymphocyte(IEL)counts were lowered by DIC in animals challenged with Salmonella(P=0.07).With ETEC F4,the IEL counts were higher with DIC on d 8 PI(P=0.08).Conclusions:This study c

关键词： Enteric pathogen Gut microbiota Intestinal immunity medium-chain fatty acids Weaning pig

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Design of a Novel Exoskeleton with Passive magnetic Spring Self-locking and Spine Lateral Balancing

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Journal of Bionic Engineering 2024年第1期21卷 236-255页

作者： Jhon F.rodríguez-León Betsy D.m.Chaparro-Rico Daniele Cafolla Francesco Lago Eduardo Castillo-Castañeda Giuseppe Carbone Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada Unidad Querétaro MecatronicaInstituto Politécnico NacionalCerro Blanco 14176090 Colinas del CimatarioQuerétaroMexico Department of mechanical Energy and Management EngineeringUniversity of CalabriaVia P.Bucci Cubo 46 C87036 RendeItaly Faculty of Science and Engineering Department of Computer ScienceSwansea UniversitySwanseaUK CESTER University of Cluj-NapocaCluj-NapocaRomania

This paper proposes a new upper-limb exoskeleton to reduce worker physical *** proposed design is based on a novel PRRRP(P-Prismatic;R-Revolute)kinematic chain with 5 passive Degrees of Freedom(DoF).Utilizing a magnetic spring,the proposed mechanism includes a specially designed locking mechanism that maintains any desired task *** proposed exoskeleton incorporates a balancing mechanism to alleviate discomfort and spinal torsional effects also helping in limb weight *** paper reports specific models and simulations to demonstrate the feasibility and effectiveness of the proposed *** experimental characterization is performed to validate the performance of the mechanism in terms of forces and physical strain during a specific application consisting of ceiling-surface drilling *** obtained results preliminarily validate the engineering feasibility and effectiveness of the proposed exoskeleton in the intended operation task thereby requiring the user to exert significantly less force than when not wearing it.

关键词： Assistive mechanism Exoskeleton Locking mechanism Bionic robot

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Photoluminescence characteristics of soft PZT 53/47 ceramic doped at A and/or B sites

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Journal of Advanced Ceramics 2018年第2期7卷 109-116页

作者： m.D.DURRUTHY-rodríguez J.J.GERVACIO-ARCINIEGA m.HERNáNDEZ-GARCíA J.m.YánEZ-LImóN Universidad Nacional Evangélica Departamento de Física Aplicada Instituto de CibernéticaMatemáticay FísicaCITMA Catedrático CONACYT-Facultad de Ciencias Físico matemáticas Benemérita Universidad Autónoma de Puebla CINVESTAV-Unidad Querétaro del IPN Libramiento Norponiente 2000Fracc.Real de Juriquilla

This study presents the photoluminescence characteristics of the PZT 53/47 system doped at A and/or B sites, with Nb(PZTN), La(PLZT), and Nb–La(PLZTN) in the concentration range from 0.2 to 1.0 molar fraction. The intensity of the emission bands of the system PZTN is two orders higher than the intensity of the emission bands of the systems PLZT and PLZTN, and these emission bands are located at 1.73 eV(718 nm), 2.56 eV(485 nm), and 2.93 eV(424 nm). The origin of the luminescence in these systems is associated with lead and oxygen vacancies produced during the sintering process. The results from X-ray diffraction(XRD) show a mixture of rhombohedral and tetragonal phases. The system PZTN shows a higher tetragonal phase concentration, while PLZT and PLZTN systems show a higher rhombohedral phase concentration. The cell volume shows an increase with dopant concentration only in the case of the PLZTN system. The band gap energy shows a small variation in the PZTN and PLZTN cases around 3.0 eV, a close value to the band gap energy of the pure PZT 53/47 sample. The system PLZT shows an increasing behavior until 4.41 eV for the higher dopant concentration.

关键词： photoluminescence PZT ceramics band structure X-ray diffraction(XRD)

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ScY@C_(3v)(8)-C_(82):metal-metalσ^(2)Bond in mixed Rare-Earth Di-metallofullerenes

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Chinese Journal of Chemistry 2023年第15期41卷 1809-1814页

作者： Lihao Zheng Yannick Roselló Yingjing Yan Yang-Rong Yao Xiaolin Fan Josep m.Poblet Antonio rodríguez-Fortea Ning Chen College of Chemistry Chemical Engineering and Materials Scienceand State Key Laboratory of Radiation Medicine and ProtectionSoochow UniversitySuzhouJiangsu 215123China Departament de Quimica Fisica i Inorganica Universitat Rovira i VirgiliMarcelli Domingo 143007 TarragonaSpain Department of materials Science and Engineering CAS Key Laboratory of Materials for Energy ConversionAnhui Laboratory of Advanced Photon Science and TechnologyUniversity of Science and Technology of ChinaHefeiAnhui 230026China

Comprehensive Summary The experimental investigation of rare-earth metal-metal bonds remains a challenge in the study of chemical ***,we report the synthesis and characterization of a novel heteronuclear di-metallofullerene,ScY@C_(3v)(8)-C_(82),which contains a mixed rare-earth metal-metal ***@C_(3v)(8)-C_(82)was successfully synthesized by arc-discharging method and characterized by mass spectrometry,UV-vis-NIR spectroscopy and single-crystal X-ray diffraction crystallography,which unambiguously determined its molecular *** calculations were also performed to study the optimized positions of Sc-Y metallic dimer and the electronic *** combined experimental and theoretical results confirmed that both Sc and Y atoms transfer two electrons to the C_(3v)(8)-C_(82)cage,i.e.,(ScY)4+@(C_(3v)(8)-C_(82))4-.In particular,a covalent Sc-Yσ2 bond,which has never been reported before,is proven to be formed inside C_(3v)(8)-C_(82)fullerene *** work presents a novel di-metallofullerene containing mixed rare-earth metal-metal bond and expands the understanding of metal-metal bonding of rare earth elements.

关键词： Fullerenes Endohedral fullerenes Rare earths Densityfunctional calculations metal-metal bond

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Wood anatomical acclimation in the endemic genus Polylepis in Peruvian Andean forests

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Journal of mountain Science 2024年第9期21卷 2986-3000页

作者： Anthony GUERRA Fressia N.AmES-mARTÍNEZ Ernesto C.rodrÍguez-RAmÍREZ Postgraduate Programme in Agronomy/Plant Physiology Department of Biology-Institute of Natural Sciences Federal University of LavrasLavras 37203-202Minas Gerais 30000-31999Brazil Laboratory of Biotechnology and molecular Biology Continental UniversitySan Antonio UrbanizationHuancayo 12000Peru Ecology and Biodiversity Research Programme ANDINUS AssociationMiguel Grau Street 370Huancayo 12000Peru Dendrochronology Laboratory Continental UniversitySan Carlos Avenue 1980Huancayo 12000Peru

Polylepis(Queñua)is a dominant woody plant genus in Andean Puna forests that occurs in a wide range of montane habitats and is ecologically diverse in endemism,which may be particularly threatened by climate *** anatomical traits are essential for understanding how plants adjust their ecophysiological requirements and maximize their resilience,resistance,and recovery to extreme *** the effects of extreme climatic conditions in high altitude ecosystems have been studied extensively,our knowledge is relatively limited to quantitative differences in the main xylem *** address this gap,we assessed the acclimation of wood anatomical traits in six Peruvian Andean Polylepis species with different water availability(semi-dry with high moisture and semiarid with dry winters).We selected hydraulic diameter,vessel density,vessel grouping index,solitary vessel index,vulnerability index,mesomorphy index,vessel element length,fiber length,fiber wall thickness,fiber lumen diameter,and total fiber diameter that can provide relevant eco-wood anatomical acclimation to hydric *** performed multivariate analysis to determine the leading dimensions of covariation among Polylepis species and climatic *** wood anatomical traits(vessel grouping index,vulnerability index,and fiber wall thickness)were dissimilar between xeric-and mesic-Polyelpis *** study demonstrates that wood anatomical traits in Peruvian Andean Polylepis species provides high-resolution and long-term eco-wood anatomical signals on how climate oscillations drive the acclimation processes of fiber and vessel *** findings underscore the significance of xylem hydraulic adjustment to various hydrological environments in Andean puna *** evaluating the effects of drought on wood anatomical characteristics and ecological function,we demonstrate the capacity of tree species to adapt and endure climate-related changes,thereby emphasizing their resilience and ada

关键词： Carlquist indices Climatic resilience Vessel traits Fiber Functional trait Hydric stress

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Agro-Industrial Waste as a Source of Raw material:Eggshell and Ash of Agave salmiana Useful for the Synthesis of Hydroxyapatite

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Journal of Renewable materials 2022年第12期10卷 3559-3572页

作者： Nora Elizondo-Villarreal Luz HVerástegui-Dominguez Jose JQuijano-Briones Francisco JVázquez-rodríguez Eden rodríguez-Castellanos Enrique López-Cuellar Ernesto Torres-Lopez Victor mCastaño-meneses Universidad Autónoma de Nuevo León Facultad de Ciencias Fisico MatemáticasCiudad UniversitariaSan Nicolás de los GarzaNuevo LeónMéxico Universidad Autónoma de Nuevo León Facultad de ArquitecturaCiudad UniversiariaSan Nicolás de los GarzaNuevo LeónMéxico Universidad Autónoma de Nuevo León Facultad de Ingeniería Mecainicay EléctricaCiudad UniversitariaSan Nicolás de los GarzaNuevo LeónMéxico Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autonoma de MéxicoQuerétaroMéxico

Agave salmiana ash and poultry eggshell powder as CaO sources were used for obtaining nanostructured hydro-xyapatite(HAP).The synthesis was carried out by the Green Chemistry Hydrothermal Biosynthesis at 180℃ with a pH of 5,by reacting CaO from Agave Salmiana ash and Eggshell powder,with dibasic caldium phosphate(CaH-PO_(4)+2H_(2)O)in an aqueous solution,with Aloe barbadensis *** product was characterized by X-ray dif-fraction,Fourier transform infrared spectroscopy(FT-IR),Scanning Electron microscopy(SEm),and Transmission Electron microscopy(TEm).The size and shape of the hydroxyapatite particles changed dramati-cally in the presence of Aloe *** crystals of Hydroxyapatite were observed when Eggshell powder and Agave salmiana ash were used as raw materials in the presence of the Aloe barbadensis *** with shapes of ribbons and plates from 1 micrometers to 8 micrometers were observed when using the eggshell powder in the presence of Aloe bar badensis and,in the case of Agave salmiana ash in the presence of Aloe bar-badensis,crystals with shapes of quadra ngular prisms and hexagonal(polyhedra)with sizes from 2 micrometers to 20 micrometers were *** was therefore successfully biosynthesized by a green and sus-tainable method that reduces the environmental impact.

关键词： Hydroxyapatite raw materials Agave salmiana eggshell Aloe barbadensis surfactant

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Periodic Solutions in Unbounded Domains for the Boussinesq System

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Acta mathematica Sinica,English Series 2010年第5期26卷 837-862页

作者： Elder Jesús VILLAmIZAR-ROA maría ngeles rodríguez-BELLIDO marko Antonio ROJAS-mEDAR Escuela de matemáticas Universidad Nacional de Colombia Dpto. Ecuaciones Diferenciales y Análisis Numérico Universidad de Sevilla Aptdo Dpto. de Ciencias Básicas Facultad de Ciencias Universidad del Bío BíoCampus Fernando May

Assuming that the external forces of the system are small enough, the reference temperature being a periodic function, we study the existence, the uniqueness and the regularity of time-periodic solutions for the Boussinesq equations in several classes of unbounded domains of Rn. Our analysis is based on the framework of weak-Lp spaces.

关键词： Boussinesq equations strong periodic solutions unbounded domains

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Pathways of Phosphorus Absorption and Early Signaling between the mycorrhizal Fungi and Plants

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Phyton-International Journal of Experimental Botany 2021年第5期90卷 1321-1338页

作者： Griselda madrid-Delgado marcos Orozco-miranda mario Cruz-Osorio Ofelia Adriana Hernández-rodríguez Raúl rodríguez-Heredia melchor Roa-Huerta Graciela Dolores Avila-Quezada Facultad de Ciencias Agrotecnológicas Universidad Autónoma de Chihuahua(UACH)Chihuahua31000México Innovak Global Chihuahua31375México

This review highlights the key role that mycorrhizal fungi play in making phosphorus(Pi)more available to plants,including pathways of phosphorus absorption,phosphate transporters and plant-mycorrhizal fungus symbiosis,especially in conditions where the level of inorganic phosphorus(Pi)in the soil is *** fungi colonization involves a series of signaling where the plant root exudates strigolactones,while the mycorrhizal fungi release a mixture of chito-oligosaccharides and liposaccharides,that activate the symbiosis process through gene signaling pathways,and contact between the hyphae and the *** the symbiosis is established,the extraradical mycelium acts as an extension of the roots and increases the absorption of nutrients,particularly phosphorus by the phosphate *** then moves along the hyphae to the plant root/fungus *** transfer of Pi occurs in the apoplectic space;in the case of arbuscular mycorrhizal fungi,Pi is discharged from the arbuscular to the plant’s root symplasm,in the membrane that surrounds the *** is then absorbed through the plant periarbuscular membrane by plant phosphate ***,plants can acquire Pi from soil as a direct absorption *** a result of this review,several genes that codify for high-affinity Pi transporters were *** plants,the main family is Pht1 although it is possible to find others such as Pht2,Pht3,Pho1 and *** in plants,mycorrhizal fungi have genes belonging to the Pht1 *** arbuscular mycorrhizal fungi we found L1PT1,GiPT,mtPT1,mtPT2,mtPT4,HvPT8,ZmPht1,TaPTH1.2,GmosPT and ***1,HcPT2 and BePT have been characterized in ectomycorrhizal *** gene has a different way of expressing *** this review,we present diagrams of the symbiotic relationship between mycorrhizal fungi and the *** knowledge allows us to design solutions to regional problems such as food production in soils with low levels of Pi.

关键词： Interaction,mycorrhiza establishment,symbiosis phosphate uptake

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