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BatiO_(3)solid solutions co-doped with Gd^(3+)and Eu^(3+):Synthesis,structural evolution and dielectric properties

Journal of Rare Earths 2024年第10期42卷 1920-1926页

作者： R.ma.tínez-López M.Pérez-Labra J.A.Romero-Serrano F.R.Barrientos-Hernández M.Reyes-Pérez M.I.Valenzuela-Carrillo G.Urbano-Reyes V.E.Reyes-Cruz G.I.Dávila-Pulido Academic Area of Earth Sciences and materials Autonomous University of Hidalgo StateRoad Pachuca-Tulancingo Km 4.5 Mineral de La Reforma.Hidalgo42184Mexico Metallurgy and materials Department ESIQIE-IPNUPALMZacatencoCiudad de Mexico07738Mexico Autonomous University of Coahuila Boulevard Adolfo López Mateos S/nNueva RositaCoahuila26800Mexico

In this paper,the synthesis,structural evolution,and dielectric properties of BatiO_(3)solid solutions codoped with rare earth elements(Gd^(3+)and Eu^(3+))prepared using the solid-state reaction method are *** pure precursor powders of BaCl_3,tiO_(2),Gd_(2)O_(3),and Eu_(2)O_(3)were mixed in stoichiometric proportions,ground in an agate mortar before being uniaxially pressed at 250 Mpa and sintered at 1300℃in air atmosphere for 6 h to obtain Ba_(1-3x)Gd_(2x)ti_(1-3x)Eu_(4x)O_(3)(x=0,0.0015,0.01 and0.1).X-ray diffraction(XRD)and Rietveld's refinement results reveal the crystal phase ferroelectric tetragonal BatiO_(3)for the samples with x=0,0.0015 and 0.01,as well as a consistent increment in the lattice parameters caused by the *** solubility limit of Gd^(3+)and Eu^(3+)in the BatiO_(3)structure is reached for the sample with x>0.01,and the orthorhombic Eu_2tiO_(5)and monoclinic Bati_(2)O_(5)secondary phases were *** raman results show the characteristic peaks of ferroelectric tetragonal BatiO_(3)around 716 cm^(-1)(lo of A1 symmetry),515 cm^(-1)(tO of A1 symmetry),and 305 cm^(-1)(B1).the maximum relative permittivity measured at 1 kHz was recorded to be 6151.8 for the sample with x=0.0015,and a decrease in the Curie temperature to 105℃with respect to the undoped sample was *** punctual microanalysis for the samples with x=0.0015,0.01,and 0.1 reveals grains composed of Ba,ti,O,Gd,and Eu homogeneously distributed in the BatiO_(3)*** Ba/ti ratios for samples with x=0.0015,0.01 and 0.1 are 2.86,2.91,and 0.68,respectively,indicating substitution at the ti site for samples with x=0.0015 and 0.01 and a substitution at the Ba site for the sample with x=0.1.

关键词： BatiO_(3) Doping Gadolinium Europium Synthesis Rare earths

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Modelling of the variation of granular base materials resilient modulus with material characteristics and humidity conditions

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Journal of Road Engineering 2024年第1期4卷 27-35页

作者： Jean-pascal Bilodeau Erdrick Leandro Perez-Gonzalez Ali Saeidi Departement de Genie Civil et Genie des Eaux Universite LavalQuebecG1V 0A6Canada Departement des Sciences Appliquees Universite du Quebeca ChicoutimiChicoutimiG7H 2B1Canada

this study aims to quantify the susceptibility of granular materials used in pavements to changes in moisture content and propose a correlation model to incorporate this susceptibility into seasonal *** fines content and the percentage of fractured coarse aggregates were identified as direct indicators of the resilient modulus susceptibility to changes in water *** results showed that the percentage of fractured coarse aggregates particles(FR)has a more significant impact on the resilient modulus(Er)of crushed granular materials used in pavement construction than the combined indicator of the fines content and sample volumetrics(nf).Crushed granular materials with a higher percentage of fractured coarse aggregates are relatively insensitive to changes in the degree of saturation,but become more sensitive as the fine fraction porosity *** adjusted model was proposed based on the existing formulation,but considers a complex parameter to describe and adjust the sensitivity of base granular materials to variations in moisture content with respect to fabrication charac-teristics,fines content and volumetric *** model shows that the variation of Er values is below10%for fully crushed granular ***,it reaches approximately±12%for materials with 75%of crushed coarse aggregates andþ40%and-25%for materials with FR=50%.this model could help select good ag-gregates characteristics and adjust grain-size distribution for environments where significant moisture content variations can occur in the pavement system,such as in the Province of Quebec(Canada).As it is based on pa-rameters that can be easily determined or estimated,it also represents a valuable tool for detailed design and analysis that can consider material characteristics.

关键词： Resilient modulus Degree of saturation Humidity conditions Unbound granular materials pavement base

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Helminth parasites of freshwater fishes from Cuatro Ciénegas,Coahuila,in the Chihuahuan Desert of Mexico:inventory and biogeographical implications

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Integrative Zoology 2014年第3期9卷 328-339页

作者： Rogelio AGUILAR-AGUILAR Andrés ma.tÍnez-AQUINO Héctor ESPINOSA-PÉrez Gerardo PÉrez-PONCE DE LEÓN Comparative Biology Department National Autonomous University of MexicoMexico CityMexico Laboratory of Helminthology National Autonomous University of MexicoMexico CityMexico Graduate Program in Biological Sciences National Autonomous University of MexicoMexico CityMexico National Collection of Fish National Autonomous University of MexicoMexico CityMexico

As part of an ongoing inventory of the helminth parasites of freshwater fishes in Mexico, 570 individual fish were collected between Apr 2008 and Oct 2011 in 26 localities along the Cuatro Ciénegas region in Coahuila State, northern Mexico. Seventeen species of hosts, mostly corresponding to Nearctic freshwater elements, were studied. A total of 8324 individual worms were collected during this survey, representing 25 species of helminths, of which 9 were digeneans, 3 monogeneans, 3 acanthocephalans, 9 nematodes and 1 cestode. Most of the records in this checklist represent new host or locality records. the information provided in this checklist may be helpful for our understanding of the biodiversity and historical biogeography of this host-parasite system, because in the Cuatro Ciénegas region occur a Nearctic freshwater fish fauna, along with Neotropical and endemic elements, and from a biogeographical point of view, this may represent a transitional area.

关键词： Acanthocephala Cestoda Cuatro Ciénegas Digenea freshwater fish Mexico Monogenea Nematoda

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Which stressors are responsible for the worsening in the clinical symptomatology of lupus?

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Health 2009年第4期1卷 313-319页

作者： M. I. Peralta-ram.rez J. Jiménez-Alonso M. Pérez-García 不详

Objective: the purpose of this study was to test which stressors worsen the symptoms perceived by patients with lupus, thus broadening and corroborating results obtained in a previous study published in Psychosomatic Medicine. Methods: In order to examine this question, we selected 43 patients with lupus whose symp-toms worsened due to the effects of daily stress. these patients were divided into two groups: patients whose increase in clinical lupus symp-tomatology was predicted by an increase in daily stressors on the same day (G1) and pa-tients whose increase in clinical lupus symp-tomatology was predicted by an increase in daily stressors the day before and the same day (G2). Later, three factorial analyses were con-ducted with the items related to stressors and the items related to lupic symptoms. Results: the results showed that in G1 there were three factors that made up a total of 35.08% of the explained variance. the stressors associated with certain symptoms of the illness in this group are feeling ill or being worried about their physical appearance, with the main stressor being the illness itself. However, in G2, two factors were found that made up a total of 40.37% of the explained variance for lag=0 and 38.67% for lag=1. the stressors associated with the majority of the lupus symptoms are of an interpersonal and work-related nature. this as-sociation was maintained when we carried out the factorial analyses with the items of the symptoms from the following day. Conclusions: the interpersonal and work-related stressors are related to a worsening in the majority of the lupic symptoms in the patients whose sympto-matology worsens as a result of daily stress experienced the day before.

关键词： Daily Stress Interpersonal Stressor Work-Related Stressors Systemic Lupus Erythematosus

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Interaction of piRNA-like sequences from the 3′-UtR of SARS-CoV-2 with mRNA regions

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Genes & Diseases 2023年第6期10卷 2282-2284页

作者： Laura Pérez-Campos mayoral maría teresa Hernández-Huerta Carlos Romero Díaz Carlos Alberto matias-Cervantes Eduardo Pérez-Campos mayoral margarito ma.tínez Cruz Juan de Dios Ruiz-Rosado Edgar Gustavo ramos ma.tínez marco Antonio Sánchez Medina Eduardo Pérez-Campos Research Center Faculty of Medicine UNAM-UABJOAutonomous University“Benito Juárez”of Oaxaca(UABJO)Oaxaca 68020Mexico CONACyt Faculty of Medicine and Surgery.Autonomous University“Benito Juárez”of Oaxaca(UABJO)Oaxaca 68020Mexico National technology of Mexico(tecNM)/It Oaxaca Oaxaca de JuárezOaxaca 68030Mexico the Research Institute at Nationwide Children's Hospital Columbus 43205USA Facultad de Química Universidad Nacional Autónoma de MéxicoCoyoacán 04510Mexico

Piwi-interacting RNAs(piRNAs of 26-32 nt in length)regulate gene expression,epigenetics,and transcriptional and post-transcriptional processes.1 In humans,piRNAs are expressed in germline and somatic tissues,and generally have a uracil at the 5'-end(position+1),an adenine at the+10 position,and are 2'-0 methylated at the 3'-end.2 Onice piRNAs form the RNA-induced silencing complex(RISC)with PIWl proteins,they serve as guides to find their complementary sequences of the target mRNA,thus initiating their *** Wuhan patient's genome is approximately 265 nucleotides(nts)in its 3'-UtR;piRNAs-like sequences have been reported in this region.3 Our objective was to search,through bioinformatics,for mRNA sequences that were homologous to the reverse complementary of the previously reported piRNA-like sequences from the 3'-UtR of SARS-Cov-2,3 and identify the possible interaction between them.

关键词： sequences complementary initiating

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Insights into the genetic architecture of congenital heart disease from animal modeling

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Zoological Research 2023年第3期44卷 577-590页

作者： Wenjuan Zhu Cecilia W.lo the Chinese University of Hong Kong Hong Kong SARChina Department of Developmental Biology University of Pittsburgh School of MedicinePittsburghPA15201 USA Kunming Institute of Zoology-the Chinese University of Hong Kong(KIZ-CUHK)Joint Laboratory of Bioresources and Molecular Research of Common Diseases Hong Kong SARChina

Congenital heart disease(CHD)is observed in up to 1%of live births and is one of the leading causes of mortality from birth *** hundreds of genes have been implicated in the genetic etiology of CHD,their role in CHD pathogenesis is still poorly *** is largely a reflection of the sporadic nature of CHD,as well as its variable expressivity and incomplete *** reviewed the monogenic causes and evidence for oligogenic etiology of CHD,as well as the role of de novo mutations,common variants,and genetic *** further mechanistic insight,we leveraged single-cell data across species to investigate the cellular expression characteristics of genes implicated in CHD in developing human and mouse embryonic *** the genetic etiology of CHD may enable the application of precision medicine and prenatal diagnosis,thereby facilitating early intervention to improve outcomes for patients with CHD.

关键词： Congenital heart disease Genetic modifier Single cell sequencing De novo mutation Protective variant Common copy number variant

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StING regulates BCR signaling in normal and malignant B cells

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Cellular & Molecular Immunology 2021年第4期18卷 1016-1031页

作者： Chih-Hang Anthony tang Avery C.Lee Shiun Chang Qin Xu Andong Shao Yun lo Walker t.Spalek Javier A.Pinilla-lbarz Juan R.Del Valle Chih-Chi Andrew Hu the Wistar Institute 3601 Spruce StreetPhiladelphiaPA 19104USA Department of malignant Hematology H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA Department of Chemistry&Biochemistry University of Notre DameNotre DameIN 46556USA

StING is an endoplasmic reticulum(ER)-resident protein critical for sensing cytoplasmic DNA and promoting the production of type Ⅰ interferons;however,the role of StING in B cell receptor(BCR)signaling remains *** generated StING V154M knock-in mice and showed that B cells carrying constitutively activated StING specifically degraded membrane-bound IgM,Ig a and Igβ via SEL1L/HRD1-mediated ER-associated degradation(ERAD).B cells with activated StING were thus less capable of responding to BCR activation by phosphorylating Igα and Syk than those without activated *** immunized with t-independent antigens,StING V154M mice produced significantly fewer antigen-specific plasma cells and antibodies than immunized wild-type(Wt)*** further generated B cell-specific StING^(KO) mice and showed that StING^(KO) B cells indeed responded to activation by transducing stronger BCR signals than their StING-proficient *** B cell-specific StING^(KO) mice were t-independently immunized,they produced significantly more antigen-specific plasma cells and antibodies than immunized StIN^(Wt)*** both human and m ouse IGHV-unmutated malignant chronic lymphocytic leukemia(CLL)cells downregulated the expression of StING,we explored whether StING downregulation could contribute to the well-established robust BCR signaling phenotype in malignant CLL *** generated a StING-deficient CLL mouse model and showed that StING-deficient CLL cells were indeed more responsive to BCR activation than their StING-proficient *** results revealed a novel B cell-intrinsic role of StING in negatively regulating BCR signaling in both normal and malignant B cells.

关键词： StING BCR ER-associated degradation CLL Plasma cells

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Climate-driven variations in productivity reveal adaptive strategies in Iberian cork oak agroforestry systems

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Forest Ecosystems 2022年第1期9卷 83-93页

作者： José Carlos Pérez-Girón Emilio Rafael Díaz-Varela Pedro Álvarez-Álvarez Department of Organisms and Systems Biology Polytechnic School of MieresUniversity of OviedoE-33600MieresAsturiasSpain Research Group on Planning and management in Complex Adaptive Socio-Ecological Systems(COMpaSSES).School of Engineering University of Santiago de CompostelaE-27002LugoSpain

Background:Cork oak agroforestry systems(AFS)have been managed for centuries by humans to produce cork and other goods and services and have recently been recognised as an important reservoir for biodiversity improvement and ***,despite having recently been included as a natural habitat of community-wide interest within the EU Habitats Directive,these systems are in a critical situation of *** other factors,they are strongly threatened by climate change,the effects of which are also expected to be particularly severe in the Mediterranean *** this study,we aimed to evaluate the influence of climate variability by examining primary production indicators and also to analyse whether the geographical location may have a role in the incidence of the adverse effects of ***:Cork oak AFS were identified in the Forest map of Spain and the Land use map of Portugal and categorized on the basis of canopy *** climate data from 2001 to 2020 were used to model relationships with climate predictors and proximity to the *** analysis was conducted to identify significant spatial clusters of high-and low-efficiency ***:the responses to the influence of climatic conditions differed among the various cork oak AFS categories,particularly in the forest category,which was less dependent on climate *** humidity and water availability were the main drivers of net primary production(NPP).Carbon use efficiency(CUE)was limited by relative humidity and spring temperature in open *** to the coast proved beneficial,especially in years with adverse weather conditions,but was not a limiting factor for survival of the ***,the results of the hotspot analysis supported the other findings,highlighting high-efficiency areas close to the coast and cold spots grouped in specific areas or dispersed ***:Canopy plays a key role in the influence of climatic conditions,particu

关键词： Net primary production Carbon use efficiency Climate Quercus suber Agroforestry system

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the short form of the SUR1 and its functional implications in the damaged brain

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Neural Regeneration Research 2022年第3期17卷 488-496页

作者： Iván Alquisiras-Burgos Javier Franco-Pérez Moisés Rubio-Osornio Penélope Aguilera Laboratorio de patología Vascular Cerebral Instituto Nacional de Neurología y Neurocirugía“Manuel Velasco Suárez”CDMXMexico Laboratorio de Formación Reticular Instituto Nacional de Neurología y Neurocirugía“Manuel Velasco Suárez”CDMXMexico Laboratorio Experimental de Enfermedades Neurodegenerativas Instituto Nacional de Neurología y Neurocirugía“Manuel Velasco Suárez”CDMXMexico.

Sulfonylurea receptor(SUR) belongs to the adenosine 5′-triphosphate(AtP)-binding cassette(ABC) transporter family;however,SUR is associated with ion channels and acts as a regulatory subunit determining the opening or closing of the ***8 and Abcc9 genes code for the proteins SUR1 and SUR2,*** SUR1 transcript encodes a protein of 1582 amino acids with a mass around 140–177 k Da expressed in the pancreas,brain,heart,and other *** is well known that SUR1 assembles with Kir6.2 and tRPM4 to establish K_(AtP) channels and non-selective cation channels,***8 and 9 are alternatively spliced,and the resulting transcripts encode different isoforms of SUR1 and SUR2,which have been detected by different experimental ***,the use of binding assays to sulfonylureas and Western blotting has allowed the detection of shorter forms of SUR(-65 k Da).Identity of the SUR1 variants has not been clarified,and some authors have suggested that the shorter forms are ***,immunoprecipitation assays have shown that SUR2 short forms are part of a functional channel even coexisting with the typical forms of the receptor in the *** evidence confirms that the structure of the short forms of the SURs is fully functional and does not lose the ability to interact with the *** structural changes in short forms of SUR modify its affinity to AtP,regulation of its expression might represent an advantage in pathologies where AtP concentrations decrease and a therapeutic target to induce ***,the expression of SUR1 variants might be induced by conditions associated to the decrease of energetic substrates in the brain(*** stroke and epilepsy).In this review,we want to contribute to the knowledge of SUR1 complexity by analyzing evidence that shows the existence of short SUR1 variants and its possible implications in brain function.

关键词： brain edema epilepsy parkinson's disease stroke sulfonylurea receptor 1 SUR1 traumatic brain injury tRPM4

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Efficient first-principles prediction of solid stability:towards chemical accuracy

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npj Computational materials 2018年第1期4卷 591-596页

作者： Yubo Zhang Daniil A.Kitchaev Julia Yang tina Chen Stephen t.Dacek Rafael A.Sarmiento-Pérez maguel A.L.marques Haowei Peng Gerbrand Ceder John P.Perdew Jianwei Sun Department of Physics and Engineering Physics Tulane UniversityNew OrleansLA 70118USA Department of materials Science and Engineering MITCambridgeMA 02139USA materials Science Division LBNLBerkeleyCA 94720USA Department of materials Science and Engineering UC BerkeleyBerkeleyCA 94720USA Institute of Physical Chemistry and National Center for Computational Design and Discovery of Novel materials Department of ChemistryUniversity of BaselKlingelbergstrBasel 804056Switzerland Institut für Physik Martin-Luther-Universität Halle-WittenbergHalle D-06099Germany Department of Physics Temple UniversityPhiladelphiaPA 19122USA Department of Chemistry Temple UniversityPhiladelphiaPA 19122USA

the question of material stability is of fundamental importance to any analysis of system properties in condensed ma.ter physics and materials *** ability to evaluate chemical stability,i.e.,whether a stoichiometry will persist in some chemical environment,and structure selection,*** crystal structure a stoichiometry will adopt,is critical to the prediction of materials synthesis,reactivity and ***,we demonstrate that density functional theory,with the recently developed strongly constrained and appropriately normed(SCAN)functional,has advanced to a point where both facets of the stability problem can be reliably and efficiently predicted for main group compounds,while transition metal compounds are improved but remain a *** therefore offers a robust model for a significant portion of the periodic table,presenting an opportunity for the development of novel materials and the study of fine phase transformations even in largely unexplored systems with little to no experimental data.

关键词： properties stability chemical

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