Unveiling Invariant Optical Properties of Dielectric Meta-Atoms.

The phase-shift, transmittance, and polarization properties of meta-atoms are investigated, motivated by their use as building blocks of metasurfaces used in metalenses, holograms, and beam shaping. We studied dielectric nanorod meta-atoms of several geometries, which included cylinders, triangles, squares, hexagons, octagons, and truncated cones. By analyzing light propagation through these meta-atoms for three different wavelengths (632.8, 545, and 50 nm), we show that the phase-shift introduced is independent of their cross-section shape, contrary to the expected behavior. Additionally, we show that the polarization response is independent of the shape and that the transmittance is partially shape-independent. We identify a novel dependence of phase-shift on the effective cross-sectional area of meta-atoms. These meta-atom optical properties are independent of its shape if its geometry has a C3 or larger rotational symmetry. This optical invariance has significant implications for the topological optimization of flat optics.

Cellular receptors for mammalian viruses.

The interaction of viral surface components with cellular receptors and other entry factors determines key features of viral infection such as host range, tropism and virulence. Despite intensive research, our understanding of these interactions remains limited. Here, we report a systematic analysis of published work on mammalian virus receptors and attachment factors. We build a dataset twice the size of those available to date and specify the role of each factor in virus entry. We identify cellular proteins that are preferentially used as virus receptors, which tend to be plasma membrane proteins with a high propensity to interact with other proteins. Using machine learning, we assign cell surface proteins a score that predicts their ability to function as virus receptors. Our results also reveal common patterns of receptor usage among viruses and suggest that enveloped viruses tend to use a broader repertoire of alternative receptors than non-enveloped viruses, a feature that might confer them with higher interspecies transmissibility.

Thermodynamic Parameters of Crosslinked Elastomers (BR, SBR and NBR) and Their Blends.

Herein, a methodology is employed based on the Flory-Rehner equation for estimating the Flory-Huggins interaction parameter (χ12*) of crosslinked elastomer blends. For this purpose, binary elastomer blends containing polybutadiene rubber (BR), styrene-butadiene rubber (SBR) and nitrile-butadiene rubber (NBR), were prepared in a mixing chamber at a temperature below the activation of the crosslinking agent. Swelling tests with benzene were employed to determine the crosslinked fraction, finding that after 20 min of thermal annealing, the BR and NBR were almost completely crosslinked, while the SBR only reached 60%. Additionally, the BR-SBR blend increased by 2-3 times its volume than its pure components; this could be explained based on the crosslink density. From the mechanical tests, a negative deviation from the rule of mixtures was observed, which suggested that the crosslinking was preferably carried out in the phases and not at the interface. Furthermore, tensile tests and swelling fraction (ϕsw) results were employed to determine the average molecular weight between two crosslinking points (Mc), and subsequently χ12*. Calculated χ12* values were slightly higher than those reported in the literature. The calculated thermodynamic parameters for the blends showed positive ΔGmix values and endothermic behavior, suggesting their immiscible nature.

Projected health and economic effects of the increase in childhood obesity during the COVID-19 pandemic in England: The potential cost of inaction.

BACKGROUND: The prevalence of overweight and obesity in young children rose sharply during the COVID-19 pandemic. Here we estimate the potential future health and economic effects of these trends in England. METHODS: Using publicly available annual Body Mass Index (BMI) data from 2006-2022, we calculated the increase in overweight/obesity prevalence (BMI ≥85th reference percentile) during the COVID-19 pandemic among children aged 4-5 and 10-11, and variation by deprivation and ethnicity. We projected the impact of child BMI trends on adult health measures to estimate added lifelong medical and social costs. RESULTS: During 2020-2021 there were steep increases in overweight and obesity prevalence in children. By 2022, overweight and obesity prevalence in children aged 4-5 returned to expected levels based on pre-pandemic trends. However, overweight and obesity prevalence in children aged 10-11 persisted and was 4 percentage points (p<0.001) higher than expected, representing almost 56,000 additional children. The increase was twice as high in the most compared with the least deprived areas. The additional lifelong healthcare cost in this cohort will amount to £800 million with a cost to society of £8.7 billion. We did not find an increase in maternal obesity associated with the COVID-19 pandemic, however, prevalence grew faster in the post pandemic period. DISCUSSION: The return of overweight and obesity prevalence to pre-pandemic trends in children aged 4-5 provides a clear policy target for effective intervention to tackle this growing and serious population health concern.

All dielectric reflective metalens based on multilayer meta-atoms.

While transmission-mode metalenses have been extensively studied, reflection-mode metalenses remain almost unexplored, presenting advantages in terms of improved efficiency and reduced complexity. In this Letter, we investigate a multilayer dielectric metalens operating in reflection mode at visible wavelengths without a metallic layer. Simulations and analysis demonstrate the performance of the metalens, with an 84% reflectivity the metalens proves its efficacy in reflection mode. At a numerical aperture of 0.15, the metalens achieves a 33% focusing efficiency, which is approximately twice that of similar reflective metalenses, facilitating efficient light manipulation and subwavelength resolution. Additionally, the metalens exhibits a well-defined focal spot with a full width at half maximum of 2.03 µm, approaching the diffraction limit.

Human Anelloviruses: Influence of Demographic Factors, Recombination, and Worldwide Diversity.

Anelloviruses represent the major and most diverse component of the healthy human virome, referred to as the anellome. In this study, we determined the anellome of 50 blood donors, forming two sex- and age-matched groups. Anelloviruses were detected in 86% of the donors. The number of detected anelloviruses increased with age and was approximately twice as high in men as in women. A total of 349 complete or nearly complete genomes were classified as belonging to torque teno virus (TTV), torque teno mini virus (TTMV), and torque teno midi virus (TTMDV) anellovirus genera (197, 88, and 64 sequences, respectively). Most donors had intergenus (69.8%) or intragenus (72.1%) coinfections. Despite the limited number of sequences, intradonor recombination analysis showed 6 intragenus recombination events in ORF1. As thousands of anellovirus sequences have been described recently, we finally analyzed the global diversity of human anelloviruses. Species richness and diversity were close to saturation in each anellovirus genus. Recombination was found to be the main factor promoting diversity, although its effect was significantly lower in TTV than in TTMV and TTMDV. Overall, our results suggest that differences in diversity between genera may be caused by variations in the relative contribution of recombination. IMPORTANCE Anelloviruses are the most common human infectious viruses and are considered essentially harmless. Compared to other human viruses, they are characterized by enormous diversity, and recombination is suggested to play an important role in their diversification and evolution. Here, by analyzing the composition of the plasma anellome of 50 blood donors, we find that recombination is also a determinant of viral evolution at the intradonor level. On a larger scale, analysis of anellovirus sequences currently available in databases shows that their diversity is close to saturation and differs among the three human anellovirus genera and that recombination is the main factor explaining this intergenus variability. Global characterization of anellovirus diversity could provide clues about possible associations between certain virus variants and pathologies, as well as facilitate the implementation of unbiased PCR-based detection protocols, which may be relevant for using anelloviruses as endogenous markers of immune status.

Diverse Microbial Hot Spring Mat Communities at Black Canyon of the Colorado River.

The thermophilic microbial mat communities at hot springs in the Black Canyon of the Colorado River, thought to harbor the protistan human pathogen Naegleria fowleri, were surveyed using both culture-independent and -dependent methods to further understand the ecology of these hot spring microbiomes. Originating from Lake Mead source water, seven spring sites were sampled, varying in temperature from 25 to 55 °C. Amplicon-based high-throughput sequencing of twelve samples using 16S rRNA primers (hypervariable V4 region) revealed that most mats are dominated by cyanobacterial taxa, some but not all similar to those dominating the mats at other studied hot spring systems. 18S rRNA amplicon sequencing (V9 region) demonstrated a diverse community of protists and other eukaryotes including a highly abundant amoebal sequence related to Echinamoeba thermarum. Additional taxonomic and diversity metric analyses using near full-length 16S and 18S rRNA gene sequencing allowed a higher sequence-based resolution of the community. The mat sequence data suggest a major diversification of the cyanobacterial orders Leptolyngbyales, as well as microdiversity among several cyanobacterial taxa. Cyanobacterial isolates included some representatives of ecologically abundant taxa. A Spearman correlation analysis of short-read amplicon sequencing data supported the co-occurrences of populations of cyanobacteria, chloroflexi, and bacteroidetes providing evidence of common microbial co-occurrences across the Black Canyon hot springs.

Valuing maternal, newborn, child and adolescent health for societal progress - Going beyond the economic orthodoxy of gross domestic product.

AIM: In view of the long-standing recognition that gross domestic product (GDP) does not capture the unremunerated work largely conducted by women upon which societal well-being depends, to discuss the implications for GDP of maternal, newborn, child and adolescent health (MNCAH), and its influences on health, well-being and prosperity across the life course and across generations. METHODS: A wide-ranging discussion of the informal think-tank The Venice Forum was held over two days, with inputs from invited experts in person and online. RESULTS: There was consensus that a strong case could be made for inclusion of unremunerated work largely conducted by women as a positive contribution to GDP in view of its impact on future health and prosperity, and conversely exclusion from GDP of outputs from industries which harm health. CONCLUSION: Taken with the current challenges from COVID, climate change and conflict, there is a compelling need to redefine economic progress through equitable models and metrics that incorporate short-/medium-/long-term societal value of activities that improve MNCAH.

Effect of the Addition of Different Natural Waxes on the Mechanical and Rheological Behavior of PLA-A Comparative Study.

In this study, poly(lactic acid) (PLA) blended with different natural waxes (beeswax, candelilla, carnauba, and cocoa) was investigated. Different wax amounts, 3, 5, 10, and 15 wt%, were incorporated into the PLA using a Brabender internal mixer. The blends were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), rotational rheometer (RR), dynamic mechanical analysis (DMA), and contact angle to observe the effect of the different waxes on the PLA physicochemical, rheological, mechanical behavior, and wetting properties. The complex viscosity of the blends was studied by employing a RR. The effect of the addition of the waxes on the mechanical properties of PLA was evaluated by DMA in the tension modality. A slight decrease in the thermal stability of PLA was observed with the addition of the waxes. However, in the case of the mechanical properties, the cocoa wax showed a considerable effect, especially in the elongation at break of PLA. Likewise, waxes had an essential impact on the water affinity of PLA. Specifically, with the addition of cocoa, the PLA became more hydrophilic, while the rest of the waxes increased the hydrophobic character.

Multilayer dielectric metalens.

We propose and analyze a metalens whose meta-atoms (nanoscatterers) are integrated by a stack of quarter-wave dielectric layers. Each multilayer meta-atom is a nanopillar, which consists of alternating layers of high- and low-refractive-index materials. We show that the nanopillars of a multilayer metalens may have a smaller aspect ratio than the nanopillars of a standard metalens and have similar optical properties (focusing efficiency and chromaticity).

Contribution of Brain Cortical Features to the Psychological Risk Profile of Juvenile Offenders

Objectives: This study contributes to the neuroscience of offending behavior by addressing two aims: a) to examine differences in the cortical features in a group of male serious juvenile offenders (21 OG), versus controls (28 CG), both ranging from 18 to 21 years old; and b) to determine to what extent the differential cortical features and the risk psychological profile discriminate between the two groups. Method: Besides cortical measures, demographics, executive functioning, childhood trauma, psychopathic traits, psychopathological symptoms, and antisocial and delinquent behavior were assessed. Results: Whole-brain analysis of the cortical mantle identified increased cortical thickness in the cluster comprising the right middle temporal gyrus and a smaller surface area in the lateral orbitofrontal cortex for the OG compared to the CG. The discriminant function correctly classified 100% of cases of the CG and 94.7% of the OG. Right temporal cluster, childhood trauma, callousness and symptoms of interpersonal sensitivity, psychoticism, depression, phobic anxiety, and obsessive-compulsive behavior contributed to the OG. In turn, the lateral orbitofrontal cluster, psychopathic traits of grandiosity, unemotionality, and thrill seeking, and working memory contributed to the CG. Conclusions: The increased right middle temporal gyrus of the OG could be indicative of impaired brain development in social cognition processes since it appeared in combination with the higher risk profile. The reduced orbitofrontal cortex could be indicative of immature brain development in emotional control processes since it appeared in combination with the normative psychological profile in adolescence. Based on these novel findings, areas of potential improvement for research and intervention are suggested. (AU)

Objetivos: Este estudio contribuye a la neurociencia de la conducta delictiva abordando dos objetivos: a) examinar las diferencias en las características corticales en un grupo de delincuentes juveniles de sexo masculino (21 GD), frente a los controles (28 GC), ambos con edades comprendidas entre los 18 y los 21 años; y b) determinar hasta qué punto las características corticales diferenciales y el perfil psicológico de riesgo discriminan entre los dos grupos. Método: Además de las medidas corticales, se evaluaron los datos demográficos, el funcionamiento ejecutivo, el trauma infantil, los rasgos psicopáticos, los síntomas psicopatológicos y el comportamiento antisocial y delictivo. Resultados: El análisis del manto cortical de todo el cerebro mostró un mayor grosor cortical en el clúster que comprende la circunvolución temporal media derecha y una menor superficie en la corteza orbitofrontal lateral para el GD con respecto al GC. La función discriminante clasificó correctamente el 100% de los casos del GC y el 94,7% del GD. El clúster temporal derecho, el trauma infantil, la insensibilidad y los síntomas de sensibilidad interpersonal, psicoticismo, depresión, ansiedad fóbica y comportamiento obsesivo-compulsivo contribuyeron al GD. Por su parte, el clúster orbitofrontal lateral, los rasgos psicopáticos de grandiosidad, impasibilidad y búsqueda de emociones y la memoria de trabajo contribuyeron al GC. Conclusiones: La alteración temporal media derecha del GD podría ser indicativa de un desarrollo cerebral alterado en los procesos de cognición social, ya que este rasgo cortical apareció en combinación con el perfil de mayor riesgo. La reducción en el área orbitofrontal podría ser indicativa de un desarrollo cerebral inmaduro en los procesos de control emocional, ya que apareció en combinación con el perfil psicológico normativo en la adolescencia. A partir de estos hallazgos novedosos, se proponen áreas posibles de mejora para la investigación y la intervención. (AU)

Progress of Polyaniline Glucose Sensors for Diabetes Mellitus Management Utilizing Enzymatic and Non-Enzymatic Detection.

Glucose measurement is a fundamental tool in the daily care of Diabetes Mellitus (DM) patients and healthcare professionals. While there is an established market for glucose sensors, the rising number of DM cases has promoted intensive research to provide accurate systems for glucose monitoring. Polyaniline (PAni) is a conductive polymer with a linear conjugated backbone with sequences of single C-C and double C=C bonds. This unique structure produces attractive features for the design of sensing systems such as conductivity, biocompatibility, environmental stability, tunable electrochemical properties, and antibacterial activity. PAni-based glucose sensors (PBGS) were actively developed in past years, using either enzymatic or non-enzymatic principles. In these devices, PAni played roles as a conductive material for electron transfer, biocompatible matrix for enzymatic immobilization, or sensitive layer for detection. In this review, we covered the development of PBGS from 2015 to the present, and it is not even exhaustive; it provides an overview of advances and achievements for enzymatic and non-enzymatic PBGB PBGS for self-monitoring and continuous blood glucose monitoring. Additionally, the limitations of PBGB PBGS to advance into robust and stable technology and the challenges associated with their implementation are presented and discussed.

Stiff-Elongated Balance of PLA-Based Polymer Blends.

In this study, polymer blends with a mechanical property balance based on poly(lactic acid) (PLA), stiff polymer, and elongated polymer were developed. First, the binary blends PLA-elongated polymer [ethyl vinyl acetate (EVA) or polyethylene], or PLA-stiff polymer [polystyrene or poly(styrene-co-methyl methacrylate) (SMMA)] blends were studied using dynamic mechanic analysis (DMA) and analyzed using Minitab statistical software to determine the factors influencing the elongation or stiffness of the blends. Then, ternary blends such as elongation-poly(lactic acid)-stiff, were made from the binary blends that presented optimal performance. In addition, three blends [EVA-PLA-SMMA (EPS)] were elaborated by studying the mixing time (5, 15, and 15 min) and the added time of the SMMA (0, 0, and 10 min). Specifically, the mixing time for EPS 1, EPS 2, and EPS 3 is 5 min, 15 min, and 15 min (first EVA + PLA for 10 min, plus 5 min PLA-EVA and SMMA), respectively. Mechanical, thermal, rheological, and morphological properties of the blends were studied. According to DMA, the results show an increase in elongation at break (εb) and do not decrease the elastic module of poly(lactic acid). Nevertheless, EPS 3 excels in all properties, with an εb of 67% and modulus of elasticity similar to PLA. SMMA has a significant role as a compatibilizing agent and improves PLA processability.

Thermoplastic Starch-Based Blends with Improved Thermal and Thermomechanical Properties.

This research focused on the development of biomaterials based on cassava starch and corn starch and on the effect of the incorporation of polycaprolactone (PCL) on the thermal and thermomechanical properties of the blends. The results indicated partial compatibility in the blends, especially with cassava starch at a content of 20 wt% as reflected by the maintenance of tensile strength and elongation. In addition, the changes in the crystal quality of PCL and the displacement of the absorption bands of the carbonyl groups of PCL in the infrared (989-1000 cm-1), attributed to the formation of hydrogen bonds between these groups and the hydroxyl groups of starches, were also associated with compatibility. It was observed that the crystallinity of PLC in the presence of cassava and corn starch was 38% and 62%, respectively; a crystallinity greater than that of PCL was related to an improved nucleation at the interface. Based on these properties, the blends are expected to be functional for the manufacture of short-term use products by conventional thermoplastic processing methods.

Caracterización microscópica de la dentina de dientes temporales / Microscopic characterization of the dentin of temporary teeth

La dentina se compone de un mineral de fosfato de calcio identificado como dahllita, que se dispone en pequeños cristales de hidroxiapatita carbonatada con dimensiones de 36 × 25 × 4 nm, y por una fase orgánica cuyo principal componente es el colágeno tipo 1 en 90%, que se orienta en forma de malla. Esta conformación corresponde a los dientes permanentes. Dentro de las estructuras, encontramos túbulos dentinarios que miden, aproximadamente, entre 0.5-1 µm de diámetro en la periferia y hasta 3-5 µm cerca de la pulpa. En el presente estudio, realizado en dentina de dientes temporales, el lumen de dichos túbulos es más grande cuando se encuentra cerca de la pulpa dental. Asimismo, se encontraron cambios elementales importantes de acuerdo con las diferentes profundidades en las que se observó, encontrando un aumento en el peso porcentual de carbono cuando se encuentra a mayor profundidad, lo que indica una composición orgánica mayor en la dentina pulpar. En estudios de dientes permanentes esta composición es disminuida y con mayor concentración en la dentina cercana a la unión amelodentinaria. En dentina de dientes temporales se encontraron diferencias en el recuento de túbulos dentinarios por mm2, comparado a la dentina de dientes permanentes, donde el número de túbulos no varía mucho (AU)

Dentin is composed of a calcium phosphate mineral identified as dahllite, which is arranged in small crystals of carbonated hydroxyapatite with dimensions of 36 × 25 × 4 nm, and by an organic phase whose main component is type l collagen in 90%, which is oriented in the form of a mesh. This conformation corresponds to permanent teeth. Within the structures, we find dentin tubules that measure approximately 0.5-1 µm in diameter at the periphery and up to 3-5 µm near the pulp. In the present study, carried out in dentin of primary teeth, the lumen of these tubules is larger when it is close to the dental pulp. Likewise, important elemental changes were found according to the different depths in which it was observed, finding an increase in the percentage weight of carbon when it is at a greater depth, indicating a greater organic composition in the pulp dentin. In studies of permanent teeth, this composition is decreased and with a higher concentration in the dentin near the amelodentinal junction. In dentin of primary teeth, differences were found in the count of dentin tubules per mm2, compared to dentin of permanent teeth, where the number of tubules did not vary much (AU)

[Genitourinary symptoms of multiple chemical sensitivity in spanish publications.] / Los síntomas genitourinarios de la sensibilidad química múltiple en las publicaciones españolas.

INTRODUCTION AND OBJECTIVES:  Multiple chemical sensitivity (MCS) is a multi-symptomatic systemic disease whose genitourinary symptoms are poorly known. The aim of this article is to study these symptoms in Spanish publications. MATERIALS AND METHODS: A retrospective study of descriptive type on the genitourinary symptoms of MCS is carried out in the Spanish publications between the years 2000 and 2019. The search in Medline was performed with MeSH terms "multiple chemical sensitivity Spanish" and in Google with free terms "sensibilidad química multiple España". In the publications found, only those referring to genitourinary symptoms were selected, in which year, authors, type of article (clinical case, review, casuistry), genital symptoms, urinary symptoms, specialty, hospital or centre and city were studied. The results of these variables have been analyzed with descriptive statistics. RESULTS: We found 45 Spanish publications on MCS of which 20 (44,4%) mentioned genitourinary symptoms. The 20 articles corresponded to 7 clinical cases, 6 reviews, 2 case series, 2 updates, 1 book chapter, 1 special article and 1 consensus document. We found 12 publications on female genital symptoms (60%), 12 on urinary symptoms (60%) and 4 on male genital symptoms (20%). The specialties with the highest number of publications were Family Medicine and Psychiatry with 3 (15%) and Neumology, Toxicology and Anesthesia and Resuscitation with 2 (10%). There are publications from 13 hospitals and 7 national centers, health agencies or foundations. The publications corresponded to 10 cities, the 2 with the most publications being Madrid with 6 (30%) and Barcelona with 6 (30%). CONCLUSIONS: The genitourinary symptoms of MCS are mentioned in about half of the Spanish publications. There is a clear predominance of these symptoms in women. This "genitourinary syndrome" should be taken into account in urological and gynecological patients with MCS.

INTRODUCCIÓN Y OBJETIVOS: La sensibilidad química múltiple (SQM) es una enfermedad sistémica plurisintomática cuyos síntomas genitourinarios son poco conocidos. El objetivo de este artículo es estudiar estos síntomas en las publicaciones españolas.MATERIAL Y MÉTODOS: Se realiza un estudio retrospectivo de tipo descriptivo sobre los síntomas genitourinarios de la SQM en las publicaciones españolas entre los años 2000 y 2019. La búsqueda en Medline se realizó con términos MeSH "multiple chemical sensitivity Spanish" y en Google con términos libres "sensibilidad química multiple España". En las publicaciones encontradas se ha seleccionado únicamente aquellas que hacen referencia a síntomas genitourinarios, en las que se ha estudiado año, autores, tipo de artículo (caso clínico, revisión, casuística), síntomas genitales, síntomas urinarios, especialidad, hospital o centro y ciudad. Los resultados de estas variables se han analizado con estadísticas descriptivas.RESULTADOS: Se ha encontrado 45 publicaciones españolas sobre SQM de las que 20 (44,4%) hacen mención a síntomas genitourinarios. Los 20 artículos correspondían a 7 casos clínicos, 6 revisiones, 2 series de casuística, 2 actualizaciones, 1 capitulo de libro,1 articulo especial y 1 documento de consenso. Se encontraron 12 publicaciones sobre síntomas genitales femeninos (60%), 12 sobre síntomas urinarios (60%) y 4 sobre síntomas genitales masculinos (20%). Las especialidades con mayor número de publicaciones correspondían a Medicina de Familia y Psiquiatría con 3 (15%) y Neumología, Toxicología y Anestesia Reanimación con 2 (10%). Hay publicaciones de 13 hospitales y 7 centros nacionales, agencias de salud o fundaciones. Las publicaciones correspondían a 10 ciudades siendo las 2 con más publicaciones Madrid con 6 (30%) y Barcelona con 6 (30%).CONCLUSIONES: Los síntomas genitourinarios de la SQM se mencionan en cerca de la mitad de las publicaciones españolas. Existe un claro predominio de estos síntomas en la mujer. Habría que tener en cuenta este "síndrome genitourinario" en las pacientes urológicas y ginecológicas con SQM.

Ronchi-Hartmann type null screens for testing a plano-freeform surface with a detection plane inside a caustic surface.

We have implemented an exact ray trace through a plano-freeform surface for an incident plane wavefront. We obtain two caustic surfaces and provide the critical points related to the ray tracing process. Additionally, we study the propagation of the refracted wavefronts through the plane-curved surface. Finally, by using the Ronchi-Hartmann type null screen and placing the detection plane within the caustic region, we have evaluated the shape of a plano-freeform optical surface under test, obtaining an RMS difference in sagitta value of 6.3 µm.

Injection Molding of Low-Density Polyethylene (LDPE) as a Model Polymer: Effect of Molding Parameters on the Microstructure and Crystallinity.

Due to its relatively simple structure, low-density polyethylene (LDPE) can be considered as a model polymer for the study of its properties. Herein, the effect of processing variables on the microstructure and crystallinity of injection-molded LDPE specimens was quantitatively determined. The polymer was injected at different temperature conditions in the barrel and the mold. The specimens were characterized by scanning electron microscopy and X-ray diffraction. With the data obtained, an analysis of variance (ANOVA) was carried out, and response surface graphs (SRP) were constructed to quantify and to observe the behavior of the processing variables, respectively. Different models were obtained to predict the effect of the experimental factors on the response variables. The results showed that the interaction of the two temperatures has the greatest effect on the size of the spherulite, while the temperature of the mold affects the crystallinity. The SRP showed different behaviors: for the spherulite, the size increases with the mold temperature, while for the crystallinity, higher values were observed at an intermediate mold temperature and a low melt temperature. The results presented herein are valuable for setting empirical relations between the microstructure, crystallinity, and the molding conditions of LDPE.

Los síntomas genitourinarios de la sensibilidad química múltiple en las publicaciones españolas / Genitourinary symptoms of multiple chemical sensitivity in Spanish publications

Introdcción y objetivos: La sensibilidad química múltiple (SQM) es una enfermedadsistémica plurisintomática cuyos síntomas genitourinariosson poco conocidos. El objetivo de este artículo es estudiar estos síntomas en las publicaciones españolas. Material y métodos: Se realiza un estudio retrospectivo de tipo descriptivo sobre los síntomas genitourinarios de la SQM en las publicaciones españolas entrelos años 2000 y 2019. La búsqueda en Medline serealizó con términos MeSH “multiple chemical sensitivity Spanish” y en Google con términos libres “sensibilidad química multiple España”. En las publicacionesencontradas se ha seleccionado únicamente aquellasque hacen referencia a síntomas genitourinarios, en lasque se ha estudiado año, autores, tipo de artículo (casoclínico, revisión, casuística), síntomas genitales, síntomas urinarios, especialidad, hospital o centro y ciudad.Los resultados de estas variables se han analizado conestadísticas descriptivas. Resultados: Se ha encontrado 45 publicacionesespañolas sobre SQM de las que 20 (44,4%) hacenmención a síntomas genitourinarios. Los 20 artículos correspondían a 7 casos clínicos, 6 revisiones, 2 seriesde casuística, 2 actualizaciones, 1 capitulo de libro,1 articulo especial y 1 documento de consenso. Seencontraron 12 publicaciones sobre síntomas genitalesfemeninos (60%), 12 sobre síntomas urinarios (60%) y 4sobre síntomas genitales masculinos (20%). Las especialidades con mayor número de publicaciones correspon-dían a Medicina de Familia y Psiquiatría con 3 (15%) yNeumología, Toxicología y Anestesia Reanimación con2 (10%). Hay publicaciones de 13 hospitales y 7 centros nacionales, agencias de salud o fundaciones. Laspublicaciones correspondían a 10 ciudades siendo las2 con más publicaciones Madrid con 6 (30%) y Barcelona con 6 (30%).CONCLUSIONES: Los síntomas genitourinarios de laSQM se mencionan en cerca de la mitad de las publicaciones españolas...AU)

Intrduction y objetives: Multiple chemical sensitivity (MCS) is a multi-symptomatic systemic disease whose genitourinary symptoms arepoorly known. The aim of this article is to study thesesymptoms in Spanish publications. Material and methods: years 2000 and 2019. The search in Medline was performed with MeSH terms “multiple chemical sensitivitySpanish” and in Google with free terms “sensibilidadquímica multiple España”. In the publications found,only those referring to genitourinary symptoms were selected, in which year, authors, type of article (clinicalcase, review, casuistry), genital symptoms, urinary symptoms, specialty, hospital or centre and city were studied. The results of these variables have been analyzed withdescriptive statistics.Results: We found 45 Spanish publications on MCSof which 20 (44,4%) mentioned genitourinary symptoms. The 20 articles corresponded to 7 clinical cases,6 reviews, 2 case series, 2 updates, 1 book chapter,1 special article and 1 consensus document. We found12 publications on female genital symptoms (60%), 12on urinary symptoms (60%) and 4 on male genital symptoms (20%). The specialties with the highest number ofpublications were Family Medicine and Psychiatry with3 (15%) and Neumology, Toxicology and Anesthesiaand Resuscitation with 2 (10%). There are publicationsfrom 13 hospitals and 7 national centers, health agencies or foundations. The publications corresponded to10 cities, the 2 with the most publications being Madridwith 6 (30%) and Barcelona with 6 (30%).Conclusions: The genitourinary symptoms of MCSare mentioned in about half of the Spanish publications.There is a clear predominance of these symptoms inwomen. This “genitourinary syndrome” should be takeninto account in urological and gynecological patientswith MCS.(AU)

Crossing hands behind your back reduces recall of manual action sentences and alters brain dynamics.

The embodied meaning approach posits that understanding action-related language recruits motor processes in the brain. However, the functional impact of these motor processes on cognition has been questioned. The present study aims to provide new electrophysiological (EEG) evidence concerning the role of motor processes in the comprehension and memory of action language. Participants read lists of sentences including manual-action or attentional verbs, while keeping their hands either in front of them or crossing them behind their back. Results showed that posture impacted selectively the processing of manual action sentence, and not of attentional sentences, in three different ways: 1) EEG fronto-central beta rhythms, a signature of motor processes, were desynchronized while reading action sentences in the hands-in-front posture compared to the hands-behind posture. The estimated source was the posterior cingulate cortex, involved in proprioceptive regulation. 2) Recall of nouns associated with manual sentences decreased when learning occurred in the hands-behind posture. 3) ERPs analysis revealed that the initial posture at learning modulates neural processes during subsequent recall of manual sentences in the left superior frontal gyrus, which is related to motor processes. These results provide decisive evidence for the functional involvement of embodied simulations in the encoding and retrieval of action-related language.