Uso actual del verbo lucir como consecuencia de lenguas en contacto

La presente investigación muestra un caso concreto de las lenguas en contacto. En la actualidad cada vez es más evidente la relación que existe entre el inglés y el español. Existen factores geográficos, históricos y sociales que permiten que ambas lenguas se relacionen y que exista la influencia de una sobre la otra. Vistas las condiciones de nuestro entorno globalizado, la importancia de estudiar los fenómenos que surgen a raíz de las lenguas en contacto cada vez es más necesario. Este trabajo pretende contribuir en alguna medida al análisis del uso del verbo lucir en el español actual de México y la influencia del verbo inglés look sobre éste

Filogenia y taxonomía de las especies mexicanas del género Tectaria (Tectariaceae-Polypodiopsida) basada en caracteres morfológicos

In the genus Tectaria, about 200 species are cited which are distributed in southwest Asia and the Pacific islands; for the Neotropics there are 25-30 species, especially in South America. The systematics of the genus Tectaria has been built mainly under a morphological approach. However, the high phenotypic plasticity of taxa makes it difficult to recognize diagnostic characters, which generates errors when identification work is carried out. Mickel and Smith cited eight species for Mexico: Tectaria fimbriata (Willd.) Proctor and Lourteig, T. heracleifolia (Willd.) Underw., T. incisa Cav., T. mexicana (Fée) C. V. Morton., T. panamensis (Hook .) R. M. Tryon and A. F. Tryon, T. transiens (C. V. Morton) AR Sm., T. vivipara Jeremy and TG Walker and T. trichodes (C. V. Morton) A. R. Sm., within which a complex of species called "Complex of Tectaria incisa" is reported. In the present work, the phylogeny of the genus Tectaria with morphological, anatomical and palynological characters was explored. 15 taxa and 70 characters (21 morphological, 35 anatomical and 14 palynological) were analyzed under the criteria of maximum parsimony. 7 matrices were generated: morphological, anatomical, palynological, morphological + anatomical, morphological + palynological, anatomical + palynological, and morphological + palynological + anatomical, which were analyzed in the TNT program. Based on the traditional taxonomy analyzes, 10 taxa were delimited for the genus Tectaria: Tectaria sp 1, Tectaria sp 2, Tectaria sp 3, T. panamensis, T. transiens, T. heracleifolia, T. mexicana, T. fimbriata, T. vivipara, T. incisa. Phylogenetic analyzes suggest the delimitation of 12 taxonomic entities: Tectaria sp 1, Tectaria sp 2, Tectaria sp 3, T. panamensis, T. transiens, T. heracleifolia, T. mexicana, T. fimbriata, T. vivipara, T. incisa, T. heracleifolia 001 and T. heracleifolia 002.En el género Tectaria, se citan alrededor de 200 especies las cuales se distribuyen en el suroeste de Asia y las islas del Pacífico; para el Neotrópico existen de 25-30 especies, sobre todo en América del Sur. La sistemática del género Tectaria se ha construido principalmente bajo un enfoque morfológico. Sin embargo, la alta plasticidad fenotípica de los taxa dificulta el reconocimiento de los caracteres diagnósticos, lo que genera errores cuando se realiza el trabajo de identificación. Mickel y Smith citaron para México ocho especies: Tectaria fimbriata (Willd.) Proctor y Lourteig, T. heracleifolia (Willd.) Underw., T. incisa Cav., T. mexicana (Fée) C. V. Morton., T. panamensis (Hook.) R. M. Tryon y A. F. Tryon, T. transiens (C. V. Morton) A. R. Sm., T. vivipara Jeremy y T.G. Walker y T. trichodes (C. V. Morton) A. R. Sm, dentro de las cuales se reporta un complejo de especies denominado “Complejo de Tectaria incisa”. En el presente trabajo se exploró la filogenia del género Tectaria con caracteres morfológicos, anatómicos y palinológicos. Se analizaron 15 taxones y 70 caracteres (21 morfológicos, 35 anatómicos y 14 palinológicos) bajo los criterios de máxima parsimonia. Se generaron 7 matrices: morfológica, anatómica, palinológica, morfológica+anatómica, morfológica+palinológica, anatómica+palinológica y morfológica+palinológica+anatómica, las cuales fueron analizadas en el programa TNT. Con base en los análisis de taxonomía tradicional, se delimitaron 10 taxa para el género Tectaria: Tectaria sp 1, Tectaria sp 2, Tectaria sp 3, T. panamensis, T. transiens, T. heracleifolia, T. mexicana, T. fimbriata, T. vivipara, T. incisa. Los análisis filogenéticos sugieren la delimitación de 12 entidades taxonómicas: Tectaria sp. 1, Tectaria sp. 2, Tectaria sp. 3, T. panamensis, T. transiens, T. heracleifolia, T. mexicana, T. fimbriata, T. vivipara, T. incisa,T. heracleifolia 001 y T. heracleifolia 002

Análisis y evaluación de escenarios proyectuales para la optimización y mejora en desarrollos urbano-residenciales. Caso de estudio: sector Independencia, Toluca, Estado de México

Ante la problemática que ha surgido en la mayoría de las ciudades en México y gran parte del mundo en cuestión ambiental y social, es necesario el conocimiento de la estructura y función de los componentes sociales en relación a los componentes naturales del sistema urbano, es así que en este estudio se evalúa el escenario proyectual o consolidado para proponer un plan estratégico de acciones de optimización y mejora en zonas urbano-residencial. El caso de estudio es el Sector Independencia, área consolidada dentro de la ciudad de Toluca, Estado de México. Con base en la aplicación de indicadores de sustentabilidad urbana en tanto instrumento de valoración y prospectiva de orden cuantitativo y cualitativo del proceso urbanizador en el área de estudio, orientado a la gestión de modelos urbano-arquitectónicos sustentables desde una visión integral y sistémic

Silver nanoparticles in orthodontics, a new alternative in bacterial inhibition: in vitro study

Background The purpose of the study is to assess the antiadherent and antibacterial properties of surface-modified different orthodontic brackets with silver nanoparticles against Streptococcus mutans and Streptococcus sobrinus, using radiomarker. Methods In this study evaluated quantitatively the adherence of Streptococci to orthodontic brackets, 300 samples of orthodontic brackets were selected and classified in to 10 groups as follow: GIn (InVu-Roth), GIIn (System-AlexanderLTS), GIIIn (Gemini-Roth), GIVn (NuEdge-Roth), GVn (Radiance plus-Roth), GVI (InVu-Roth), GVII (System-AlexanderLTS), GVIII (Gemini-Roth), GIX (NuEdge-Roth), GX (Radiance plus-Roth). All the samples were sonicated and Streptococci were cultivated by gender. A radioactive marker (3H) was used to codify the bacteria and measure them. After that, the brackets were submerged in a radiolabelled solution, and the radiation was measured. The statistical analysis was calculated with ANOVA test (Sheffè post hoc). Results The results showed significant differences were found among the groups. GIIIn shown the lowest scores for both bacteria; in contrast, GIX for Streptococcus mutans and GVI for Streptococcus sobrinus were the highest values. Conclusions Surface modification of orthodontic brackets with silver nanoparticles can be used to prevent the accumulation of dental plaque and the development of dental caries during orthodontic treatment

Synthesis and Characterization of Silver Nanoparticles on Orthodontic Brackets: A New Alternative in the Prevention of White Spots

Abstract: Silver nanoparticles (AgNPs) are used for their powerful antibacterial e ect and their ability to adhere to surfaces due to their size; they are used in di erent areas of life, mainly in the area of health as medicine. More recently, in dentistry, the synthesis and characterization of AgNPs attracted significant attention due to their antibacterial properties. In this study, the AgNPs were synthesized using the most e ective method on di erent orthodontic brackets (metallic and esthetic) and characterized by scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and transmission electron microscopy (TEM). Their antimicrobial e ect was tested against the widely used standard human pathogens Staphylococcus aureus (Gram-negative) and Escherichia coli (Gram-positive). Our results showed that, via a simple chemical method, AgNPs can be synthesized on the surface of orthodontic brackets with good antimicrobial activity and the possibility of reducing dental decay, periodontal disease and white spots generated during orthodontic treatment

Paracentral acute middle maculopathy after uneventful ocular surgery with local anaesthetic blocks

OBJECTIVE: To describe the role of local anaesthetic blocks as a potential cause of paracentral acute middle maculopathy (PAMM) after uneventful ocular surgery. METHODS: Retrospective, observational, international, multicentre case series. Nine cases of PAMM with associated visual loss following uneventful ocular surgery with local anaesthetic blocks were observed in a 9-year period (2011-2020). Demographic, ocular and systemic data, anaesthetic data and surgical details were collected. Visual acuity (VA), fundus photography, fluorescein angiography, optical coherence tomography (OCT) and optical coherence tomography angiography (OCTA) images were reviewed. RESULTS: All nine cases were associated with decreased VA at 24 h postoperative check (ranging from hand movement to 20/200). A hyperreflective band within the middle retinal layers was observed in the structural OCT in the acute phase, evolving to thinning and atrophy of the inner retinal layers in sequential follow-up scans performed. Fluorescein angiography showed delayed perfusion in early arterial phase with normal perfusion in late venous phases. OCTA showed decreased perfusion in the deep capillary plexus. Visual recovery was variable between cases during follow-up (ranging from count fingers to 20/20). CONCLUSIONS: A combination of a vasoconstrictive effect of the anaesthetic agent, an intraocular pressure spike and a mechanical effect of the volume of anaesthetic injected may result in decreased retinal artery perfusion and be evidenced as PAMM in OCT scans. PAMM may present as a potential complication of local anaesthetic blocks in cases of unexpected visual loss after uneventful ocular surgery

Condition monitoring strategy based on spectral energy estimation and linear discriminant analysis applied to electric machines

Condition-based maintenance plays an important role to ensure the working condition and to increase the availability of the machinery. The feature calculation and feature extraction are critical signal processing that allow to obtain a high-performance characterization of the available physical magnitudes related to specific working conditions of machines. Aiming to overcome this issue, this research proposes a novel condition monitoring strategy based on the spectral energy estimation and Linear Discriminant Analysis for diagnose and identify different operating conditions in an induction motor-based electromechanical system. The proposed method involves the acquisition of vibration signals from which the frequency spectrum is computed through the Fast Fourier Transform. Subsequently, such frequency spectrum is segmented to estimate a feature matrix in terms of its spectral energy. Finally, the feature matrix is subjected to a transformation into a 2-dimentional base by means of the Linear Discriminant Analysis and the final diagnosis outcome is performed by a NN-based classifier. The proposed strategy is validated under a complete experimentally dataset acquired from a laboratory electromechanical system.Peer ReviewedPostprint (published version

The intervening domain from MeCP2 enhances the DNA affinity of the methyl binding domain and provides an independent DNA interaction site

Methyl-CpG binding protein 2 (MeCP2) preferentially interacts with methylated DNA and it is involved in epigenetic regulation and chromatin remodelling. Mutations in MeCP2 are linked to Rett syndrome, the leading cause of intellectual retardation in girls and causing mental, motor and growth impairment. Unstructured regions in MeCP2 provide the plasticity for establishing interactions with multiple binding partners. We present a biophysical characterization of the methyl binding domain (MBD) from MeCP2 reporting the contribution of flanking domains to its structural stability and dsDNA interaction. The flanking disordered intervening domain (ID) increased the structural stability of MBD, modified its dsDNA binding profile from an entropically-driven moderate-affinity binding to an overwhelmingly enthalpically-driven high-affinity binding. Additionally, ID provided an additional site for simultaneously and autonomously binding an independent dsDNA molecule, which is a key feature linked to the chromatin remodelling and looping activity of MeCP2, as well as its ability to interact with nucleosomes replacing histone H1. The dsDNA interaction is characterized by an unusually large heat capacity linked to a cluster of water molecules trapped within the binding interface. The dynamics of disordered regions together with extrinsic factors are key determinants of MeCP2 global structural properties and functional capabilities