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Development and characterization of 3caO·P_(2)O_(5)-SiO_(2)-MgO glass-ceramics with different crystallization degree

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Journal of Advanced ceramics 2013年第4期2卷 378-388页

作者： Juliana Kelmy M.F.DAGUANO Paulo A.SUZUKI Kurt STREcKER JoséMartinho Marques de OlIVEIRA Maria Helena Figueira Vaz FERNANDES claudinei SANTOS Universidade de São Paulo-Escola de Engenharia de lorena USP-EEL-Pólo Urbo-Industrials/nGleba AI-6Lorena-SPCEP 12600-000Brazil Universidade Federal de São João del-Rei -UFSJ-CENENCampus S^(to)Antônio-Praça Frei Orlando 170-CentroS.J.del-Rei-MG.CEP 36307-352Brazil Escola Superior Aveiro norte Edifício Rainha3720-232 O.AzeméisPortugal Universidade de Aveiro Campus Universitário de Santiago 3810-193 AveiroPortugal Universidade do Estado do Rio de Janeiro-Faculdade de Tecnologia de Resende-UERJ-FAT-Rod.Presidente Dutra km298Resende-RJCEP 27537-000Brazil

The caO-P_(2)O_(5)-SiO_(2)-MgO system presents several compounds used as biomaterials such as hydroxyapatite(HA),tricalcium phosphate(TcP)and TcP with magnesium substituting partial calcium(TcMP).Theβ-TcMP phase with whitlockite structure has interesting biological features and mechanical properties,meeting the requirements of a bioactive material for bone *** this work,the production of Mg-doped TcP,β-TcMP,has been investigated by crystallization from a glass composed of 52.75 wt%3caO·P_(2)O_(5),30 wt%SiO_(2)and 17.25 wt%MgO(i.e.,31.7 mol%caO,10.6 mol%P_(2)O_(5),26.6 mol%MgO and 31.1 mol%SiO_(2))using heat treatments between 775℃and 1100℃for up to 8 *** devitrification process of the glass has been accompanied by differential scanning calorimetry(DSc),high-resolution X-ray diffraction(HRXRD),relative density and bending strength *** characterization by HRXRD and DSc revealed the occurrence of whitlockite soon after the bulk glass preparation,a transient non-cataloged silicate between 800℃and 1100℃,and the formation of diopside in samples treated at 1100℃as crystalline *** overall crystalline fraction varied from 26%to 70%depending on the heat ***,contraction of the a-axis lattice parameter and expansion of the c-axis lattice parameter of the whitlockite structure have been observed during the heat treatments,which were attributed to theβ-TcMP formation with the partial substitution of ca^(2+)by Mg^(2+).Relative densities near 99%and 97%for the glass and glass-ceramics respectively indicated a discrete reduction as a function of the devitrification *** strengths of 70 MPa and 120 MPa were determined for the glass and glass-ceramic material crystallized at 975℃for 4 h,respectively.

关键词： glass-ceramics heat treatment high-resolution X-ray diffraction(HRXRD) bending strength

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Empathy levels of Dentistry Students in Peru and Argentina

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Health 2015年第10期7卷 1268-1274页

作者： Víctor Patricio Díaz-Narváez Fredy Gutierrez-Ventura Teresa Varela de Villalba Mercedes Salcedo-Rioja Aracelis calzadilla-Núnez Muna Hamdan-Rodríguez Marcos cervantes Universidad San Sebastián SantiagoChile Universidad Autónoma de chile SantiagoChile School of Dentistry Universidad Peruana Cayetano HerediaLimaPerú Universidad católica de córdoba CórdobaArgentina School of Dentistry Universidad Nacional Mayor de San MarcosLimaPerú Hospital Félix Bulnes SantiagoChile School of Nursing Universidad de CartagenaCartagenaColombia Faculty of Psychology Universidad del NorteBarranquillaColombia

Objectives: To compare the empathy of students in two faculties of Dentistry in Peru and Argentina, three factors were considered: universities, academic year and gender. Material and Methods: Empathy matrices in Dentistry students were measured using the Jefferson Scale of Empathy, culturally validated in Peru and Argentina. Empathy data were compared among and within the faculties tested using a three-factor analysis of variance (model III), a Duncan test, and a discriminant analysis. The level of significance used was less than 0.05. Results: We found that differences existed between the students tested. The comparison between the levels of empathy in the studied factors and the presence of unexplained variance showed that empathy was able to differentiate populations. conclusions: The results indicate variability in the empathy values associated with the factors studied. The discriminant test confirms the differences between faculties revealed by the data matrix resulting from the JSE. These differences are possibly due to the effect of educational and social factors.

关键词： Empathy Dentistry Students Peru Argentina

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conductive Behavior and Morphology of Axially Modified Gallium Phthalocyanine Thin Films onto Indium Tin Oxide Substrates

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Advances in Materials Physics and chemistry 2016年第7期6卷 211-219页

作者： Margarita Rivera Brenda Reyes María Elena Sánchez-Vergara luis Humberto Mendoza-Huizar instituto de Física Departamento de Materia Condensada Universidad Nacional Autónoma de México D.F. México México Facultad de Ingeniería Universidad Anáhuac México Norte Huixquilucan Estado de México México centro de Investigaciones Químicas Mineral de la Reforma Universidad Autónoma del Estado de Hidalgo Hidalgo México

Semiconductor molecular films based on a gallium phthalocyanine chloride (GaPccl) and a bidentate amine were prepared by using vacuum thermal evaporation and electrochemical techniques in order to investigate the preferred conduction paths within the films. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) were employed to characterize the morphology of the films. The conductivity measurements were performed with two different methods in order to investigate preferential conduction directions. The film transverse conductivity was obtained by using scanning tunneling spectroscopy (STS) and the in-plane film conductivity was measured with a four-point probe system. From spectroscopy measurements, the tunneling conductance (dI/dV) was also obtained. From these results, it was found that the conductive nature of the films was strongly influenced by the deposition technique which in turn defined the morphological characteristics of the film. The evaporated method showed better conductivity response and provided semiconductor characteristics in the film transverse direction with an in-plane ohmic response. Finally, contact angle measurements were performed and showed hydrophobic characteristics in all cases.

关键词： Thin Films Phthalocyanines Electronic Properties Electrical conductivity

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Heavy Metals Monitoring in Sediments from lerma River in West-central Mexico

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American Journal of Analytical chemistry 2018年第2期9卷 77-87页

作者： Héctor Hernández-Mendoza María Judith Ríos-lugo Elizabeth Teresita Romero-Guzmán lázaro Raymundo Reyes-Gutiérrez Michael E. Ketterer instituto Nacional de Investigaciones Nucleares Ocoyoacác México Universidad del centro de México San Luis Potosí México Universidad Autónoma de San luis Potosí San Luis Potosí México División of ciencias Básicas e Ingeniería Departmentof Recursos de la Tierra Universidad Autónoma Metropolitana-Lerma (UAM-L) Lerma México Department of chemistry Metropolitan State University of Denver Denver USA

The aim of this work was to carry out monitoring of some elements considered toxic in sediments from lerma River. An analytical method was optimized in our laboratory for quantification of nickel (Ni), cobalt (co), manganese (Mn), arsenic (As), chromium (cr) and lead (Pb) by using Inductively coupled Plasma Optical Emission Spectrometry (IcP-OES). Ten sediments were collected along the lerma River at variable distances and at 20 cm depth. Samples were heated to 60°c to dryness, followed by separation of particle size using a 74-μ No. 200 mesh for homogeneity purposes. 0.2 g of sample underwent microwave-assisted acid digestion, followed by plate evaporation. The samples were dissolved in 10 ml with HNO3 at 5% v/v for IcP-OES analysis. A certified reference material (cRM 8704) was used to evaluate the method’s accuracy and precision. The method showed linearity, precision, accuracy, and limits of quantification and detection acceptable for protocol validation of analytical method. The average results obtained in recovery of cRM 8704 were ~90% and precision was below 7% for all elements. levels concentration of As, cr, Pb show high pollution in A1, A7 and A8 sites. Therefore, co, Mn and Ni can be considered in this study as normal values. In conclusion, concentration levels of As, cr, Pb in sediments were high according to US-EPA and NOM-147-SEMARNAT/SSA1-2004. The presence of these heavy metals in lerma River could be due mainly for the emitted from industries, such as pharmaceutical, automotive, metal mechanics and tannery, and urban residual water. Finally, the method developed using IcP-OES has enabled monitoring of these elements in sediments from lerma River, with possible applications in a routine analytical laboratory.

关键词： IcP-OES lerma River Sediments US-EPA

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Evaluation of Ocimum basilicum *** Different concentrations of K^(+)as an Inhibitor of Pathogenic Bacterial Strains

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 533-541页

作者： Mercedes Georgina Ramírez-Aragón Victoria Jared Borroel-García Ramón Valenzuela-Soto Ricardo David Valdez-cepeda Francisco Javier Wong-corral Joséluis García-Hernández Universidad Politécnica de Gómez Palacio Gómez Palacio35120México Universidad Autónoma chapingo Centro Regional Universitario Centro-NorteZacatecasZac.Universidad Autónoma de ZacatecasFacultad de MatemáticasZacatecas98053México Departamento de Investigación y Posgrado en Alimentos Universidad de SonoraHermosillo83000México Facultad de Agricultura y Zootecnia Universidad Juárez del Estado de DurangoGómez Palacio34000México

The extraction of bioactive compounds has become one of the most interesting areas of modern *** therapeutic reasons,it´s important to obtain antimicrobial agents from natural *** objective of the present study was to determine the inhibitory effect of ethanolic extract of basil(Ocimum basilicum *** Rubin)subjected to different concentrations of potassium(K^(+))on the activity of three bacterial strains that are pathogens in *** was evaluated by inhibition surface and these results were compared to two antibiotics:Gentamicin(GE)and ciprofloxacin(cPF)for their efficacy against each bacterial *** variables presented significant difference(p≤0.05).According to the results,basil extract evaluated showed positive antibacterial activity against the three strains of Pseudomonas aeruginosa,listeria monocytogenes and Staphylococcus aureus on Mueller Hinton *** was observed highest inhibition areas of different diameters(15.3 mm,21.3 mm and 21.6 mm respectively)when the extract used was obtained from the plants with the highest concentration of potassium(13 mmol l-1).These values were even superior to the highest values showed on the treatments with the antibiotic gentamicin.

关键词： Basil inhibition potassium secondary metabolites antibiotics

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MillenniumDB:An Open-Source Graph Database System

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Data Intelligence 2023年第3期5卷 560-610页

作者： Domagoj Vrgoc carlos Rojas Renzo Angles Marcelo Arenas Diego Arroyuelo carlos Buil-Aranda Aidan Hogan Gonzalo Navarro cristian Riveros Juan Romero instituto Milenio Fundamentos de los Datos(IMFD) Vicuna Mackenna 4860Macul 7820436Chile Pontificia Universidad catolica de chile San JoaquinSantiago 7820436Chile Universidad de Talca Camino Los Niches Km.1CuricoRegion del Maule 3340000Chile Universidad Tecnica Federico Santa Maria Avenida Espana 1680Valparaiso 2390123Chile Dcc Universidad de ChileBeauchef 851Edificio NorteTercer PisoSantiagoRegion Metropolitana 8370456Chile

In this systems paper,we present MillenniumDB:a novel graph database engine that is modular,persistent,and open *** is based on a graph data model,which we call domain graphs,that provides a simple abstraction upon which a variety of popular graph models can be supported,thus providing a flexible data management engine for diverse types of knowledge *** engine itself is founded on a combination of tried and tested techniques from relational data management,state-of-the-art algorithms for worst-case-optimal joins,as well as graph-specific algorithms for evaluating path *** this paper,we present the main design principles underlying MillenniumDB,describing the abstract graph model and query semantics supported,the concrete data model and query syntax implemented,as well as the storage,indexing,query planning and query evaluation techniques *** evaluate MillenniumDB over real-world data and queries from the Wikidata knowledge graph,where we find that it outperforms other popular persistent graph database engines(including both enterprise and open source alternatives)that support similarqueryfeatures.

关键词： Graph databases Knowledge graphs Worst-case optimal joins Domain graphs

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Turbo-taxonomy to assemble a megadiverse lichen genus:seventy new species of cora(Basidiomycota:Agaricales:Hygrophoraceae),honouring David leslie Hawksworth’s seventieth birthday

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Fungal Diversity 2017年第3期84卷 139-207页

作者： Robert lücking Manuela Dal Forno Bibiana Moncada luis Fernando coca leidy Yasmín Vargas-Mendoza André Aptroot laura Juliana Arias Betty Besal Frank Bungartz Diego Mauricio cabrera-Amaya Marcela E.S.cáceres José luis chaves Sionara Eliasaro Martha cecilia Gutiérrez Jesús E.Hernández Marin María de los Ángeles Herrera-campos María E.Holgado-Rojas Harald Jonitz Martin Kukwa Fabiane lucheta Santiago Madriñán Marcelo Pinto Marcelli Suzana Maria de Azevedo Martins Joel A.Mercado-Díaz Jorge Alberto Molina Eduardo A.Morales Peter R.Nelson Freddy Nugra Francisco Ortega Telma Paredes Ayda lucía Patiño Rouchi Nadine Peláez-Pulido Rosa Emilia Pérez Pérez Gary B.Perlmutter Eimy Rivas-Plata Javier Robayo camilo Rodríguez Diego Fernando Simijaca Edier Soto-Medina Adriano Afonso Spielmann Alejandra Suárez-corredor Jean-Marc Torres carlos Alberto Vargas Alba Yánez-Ayabaca Gothamie Weerakoon Karina Wilk Marcela celis Pacheco Mauricio Diazgranados Grischa Brokamp Thomas Borsch Patrick M.Gillevet Masoumeh Sikaroodi James D.lawrey Botanical Garden and Botanical Museum Berlin KöniginLuise-Straße 6-814195 BerlinGermany Science Education The Field Museum1400 South Lake ShoreChicagoIL 60605USA Department of Botany Smithsonian InstitutionNational Museum of Natural History10th St Constitution Ave NWWashingtonDC 20560USA Department of Environmental Science and Policy George Mason UniversityFairfaxVA 22030-4444USA licenciatura en Biologı´a Universidad Distrital Francisco Jose´de CaldasCra.4 No.26D-54Torre de LaboratoriosHerbarioBogota´D.C.Colombia Herbario Universidad de caldas(FAUc) Edificio BicentenarioCalle 65No.26-10ManizalesA.A.275CaldasColombia ABl Herbarium G.v.d.Veenstraat 1073762 XK SoestThe Netherlands Biologı´a Universidad del Quindı´oCarrera 15 Calle 12 NorteArmeniaQuindı´oColombia 120 chavis Avenue LexingtonVA 24450USA charles Darwin Foundation Puerto AyoraSanta Cruz IslandGala´pagosEcuador Schedestraße 8 53113 BonnGermany Jardı´n Bota´nico de Bogota´Jose´celestino Mutis Avenida Calle 63 No.68-95Bogota´D.C.Colombia Departamento de Biocieˆncias Universidade Federal de SergipeAvenida Vereador Olı´mpio Grandes/n.ItabaianaCEP:49.500-000 SergipeBrazil laboratorio de Hongos Instituto Nacional de Biodiversidad(INBio)Apdo.22-3100Santo Domingo de HerediaCosta Rica Departamento de Botaˆnica Universidade Federal do Parana´Campus Polite´cnicoSetor de Cieˆncias Biolo´gicasAv.Cel.Francisco H.dos Santoss/nJardim das Ame´ricas81531-980 CuritibaPRBrazil Ingenierı´a Ambiental Universidad Distrital Francisco Jose´de CaldasCarrera 5 Este No.15-82Av.CircumvalarBogota´D.C.Colombia instituto Experimental Jardı´n Bota´nico Dr.Tobı´as lasser Centro de Investigacio´n y DesarrolloUniversidad Central de VenezuelaAve.Salvador AllendeJardı´n Bota´nico de CaracasApartado#2156Caracas 1010-AVenezuela Departamento de Bota´nica Instituto de Biologı´aUniversidad Nacional Auto´noma de Me´xicoApartado Postal 70-36704510 Ciudad De Me´xicoMexico Facultad de ciencias Escuela Profesional de Biologı´aUniv

Following a large-scale phylogenetic study of the lichenized genus cora(Basidiomycota:Agaricales:Hygrophoraceae),we formally describe 70 new species,honouring the seventieth birthday of David leslie Hawksworth,one of the preeminent figures in mycology and lichenology in the past 50 *** on an updated phylogeny using the ITS fungal barcoding locus,we now recognize 189 taxa in a genus that until recently was considered to represent a single species;including this contribution,92 of these are formally recognized,including five taxa based on historical names or collections that have not been *** of cora can be recognized by a combination of morphological(size,colour,lobe configuration,surface hairs,hymenophore size and shape),anatomical(thallus thickness,cortex structure,photobiont type,hyphal papillae),and ecogeographical features(substrate,habitat,distribution),and a keytable allowing the identification of all accepted taxa is *** new species are:cora accipiter Moncada,Madrin˜a´n&lücking ***.,*** Moncada,Soto-Medina&lücking ***.,*** Moncada,Dal Forno&lücking ***.,*** Dal Forno,chaves&lücking ***.,*** Moncada,***ı´guez&lücking ***.,*** lücking,Moncada&*** ***.,*** Moncada,Ya´nez-Ayabaca&lücking ***.,*** Moncada,Patin˜o&lücking ***.,*** lücking,***&Dal Forno ***.,*** Holgado,Rivas Plata&Perlmutter ***.,*** Dal Forno,Eliasaro&Spielmann ***.,*** Nugra,Dal Forno&lücking ***.,*** lücking,Martins&lucheta ***.,*** Moncada,R.-***´rez&lücking ***.,*** Moncada,***.&lücking ***.,*** Moncada,cabreraAmaya&lücking ***.,*** Moncada,R.-***´rez&***.,*** lücking,***&Dal Forno ***.,*** Moncada,***´rez-corredor&lücking ***.,*** Moncada,***&lücking ***.,***

关键词： Bolivia citizen science chile Mexico Puerto Rico Sri lanka

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Protocol for maximizing the triglycerides-enriched lipids production from <i>Dunaliella salina</i>SA32007 biomass, isolated from the Salar de Atacama (Northern chile)

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Advances in Bioscience and Biotechnology 2013年第8期4卷 830-839页

作者： Diana Arias-Forero Gladys Hayashida Mario Aranda Solange Araya Tamara Portilla Andreína García Paula Díaz-Palma Advanced Mining Technology center (AMTc) Faculty of Physic and Mathematics Sciences Universidad de Chile Santiago Chile Department of chemistry Faculty of Sciences Universidad Católica del Norte Antofagasta Chile laboratory of Advance Research on Foods and Drugs Department of Food Science Nutrition and Dietetics Faculty of Pharmacy Universidad de Concepción Concepción Chile

This paper reports the effects of different culture conditions for Dunaliella salina SA32007 from Salar de Atacama (second Region, northern ofchile) over biomass, lipid production and triglycerides synthesis. A maximum value of microalgae density (8.2 × 109 cells/l) and an intrinsic growth rate (0.17 d-1), were obtained using a culture with 0.5 mol/l of Nacl and a nitrogen/phosphorous (N/P) limitation of 14/1. The triglycerides production was significantly favoured under nitrogen deficiency conditions (Mann-Whitney test;p = 0.0043). However there was a nitrogen-limiting threshold for the stimulation and accumulation of triglycerides (N/P: 14/1), lower than that limit, these compounds would not be accumulated. It was also observed that triglyceride content was not proportional to the total lipid content and the maximum number of cells. The aeration system employed stimulated the growth and synthesis of structural organic molecules. Regarding microalgae growth stage subjected to nitrogen deficiency, when the deficit was applied before the lag phase, the negative effect on the biomass and the triglycerides production decreased.

关键词： lipids Triacilglycerides Nitrogen Deficiency Salinity Dunaliella salina

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Unusual clinical presentation of oral pyogenic granuloma with severe alveolar bone loss:A case report and review of literature

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World Journal of clinical cases 2023年第16期11卷 3907-3914页

作者： Sarah Monserrat lomelíMartínez Dennisse Bocanegra Morando Ana Esther Mercado González Juan Ramón Gómez Sandoval Department of Medical and life Sciences Centro Universitario de la CiénegaUniversidad de GuadalajaraOcotlán 47810Mexico Master of Public Health Department of Wellbeing and Sustainable DevelopmentCentro Universitario del NorteUniversidad de GuadalajaraColotlán 46200Mexico Periodontics Program Department of Integrated Dentistry ClinicsCentro Universitario de Ciencias de la SaludGuadalajara 44340Mexico Antiguo Hospital civil de Guadalajara“Fray Antonio Alcalde” Guadalajara 44280Mexico Research Institute of Dentistry Department of Integrated Dentistry ClinicsCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico

BAcKGROUND Pyogenic granuloma(PG)is a localized,reddish and vascularized hyperplastic lesion of the connective tissue which occurs in the oral *** most cases,the presence of this lesion does not show alveolar bone *** pathology is diagnosed clinically with some ***,the diagnosis and treatment are usually corroborated with histopathological *** SUMMARY Three clinical cases of PG associated with bone loss were described in this *** three patients presented tumor-like growth which bled on touch,and were associated with local irritant *** showed bone *** cases were treated with conservative surgical *** scarring was satisfactory,and there was no case of *** diagnoses were based on clinical findings,and were confirmed *** The occurrence of oral PG with bone loss is ***,clinical and radiographic evaluations are important for the diagnosis.

关键词： Hyperplastic lesion Pyogenic granuloma Alveolar bone loss case report

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IcT in chile at the Beginning of the Fourth Industrial Revolution

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chinese Business Review 2018年第6期17卷 263-278页

作者： Francisco Gatica Neira Gonzalo Falabella García Matías calderón Seguel Universidad del Bío-Bío ConcepciónChile Universidad de chile SantiagoChile Universidad católica del norte AntofagastaChile

This paper shows the current status of companies in the information and communication technology(IcT)sector in Santiago,*** presents the results of interviews with 13 IcT companies,reviewing structural elements that determine the development of the *** this purpose,a qualitative analysis of that interviewed group is carried out to identify their different linkages and work *** sector has a great capacity for stimulating innovative development throughout the national economy,a key element in the paradigmatic change that the so-called fourth industrial revolution imposes on us.

关键词： technical change software industry and Internet services government policies microelectronics computers and communications equipment

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