The Orbit of the New Milky Way Globular Cluster FSR1716 =VVV-GC05

Indexación: Scopus.We use deep, multi-epoch near-IR images of the VISTA Variables in the Via Lictea (VVV) Survey to measure proper motions (PMs) of stars in the Milky Way globular cluster (GC) FSR1716 = VVV-GC05. The colormagnitude diagram of this object, made by using PM-selected members, shows an extended horizontal branch, nine confirmed RR Lyrae (RRL) members in the instability strip, and possibly several hotter stars extending to the blue. Based on the fundamental-mode (ab-type) RRL stars that move coherently with the cluster, we confirmed that FSR1716 is an Oosterhoff I GC with a mean period aPabn = 0.574 days. Intriguingly, we detect tidal extensions to both sides of this cluster in the spatial distribution of PM-selected member stars. Also, one of the confirmed RRabs is located -11 arcmin in projection from the cluster center, suggesting that FSR1716 may be losing stars due to the gravitational interaction with the Galaxy. We also measure radial velocities (RVs) for five cluster red giants selected using the PMs. The combination of RVs and PMs allow us to compute for the first time the orbit of this GC, using an updated Galactic potential. The orbit results to be confined within|Zmax| < 2.0 kpc, and has eccentricity 0.4 < e < 0.6, with perigalactic distance 1.5 < Rperi (kpc) < 2.3, and apogalactic distance 5.3 < Rapo (kpc) < 6.4. We conclude that, in agreement with its relatively low metallicity ([Fe/H] =-1.4 dex), this is an inner-halo GC plunging into the disk of the Galaxy. As such, this is a unique object with which to test the dynamical processes that contribute to the disruption of Galactic GCs. © 2018. The American Astronomical Society. All rights reserved.https://iopscience.iop.org/article/10.3847/1538-4357/aacd0

Toward a Neutral Single-Component Amidinate Iodide Aluminum Catalyst for the CO₂ Fixation into Cyclic Carbonates

A new iodide aluminum complex ({AlI(κ⁴-naphbam)}, 3) supported by a tetradentate amidinate ligand derived from a naphthalene-1,8-bisamidine precursor (naphbamH, 1) was obtained in quantitative yield via reaction of the corresponding methyl aluminum complex ({AlMe(κ⁴-naphbam)}, 2) with 1 equiv of I₂ in CH₂Cl₂ at room temperature. Complexes 2 and 3 were tested and found to be active as catalysts for the cyclic carbonate formation from epoxides at 80 °C and 1 bar of CO₂ pressure. A first series of experiments were carried out with 1.5 mol % of the alkyl complex 2 and 1.5 mol % of tetrabutylammonium iodide (TBAI) as a cocatalyst; subsequently, the reactions were carried out with 1.5 mol % of iodide complex 3 as a single-component catalyst. Compound 3 is one of the first examples of a nonzwitterionic halide single-component aluminum catalyst producing cyclic carbonates. The full catalytic cycle with characterization of all minima and transition states was characterized by quantum chemistry calculations (QCCs) using density functional theory. QCCs on the reaction mechanism support a reaction pathway based on the exchange of the iodine contained in the catalyst by 1 equiv of epoxide, with subsequent attack of I⁻ to the epoxide moiety producing the ring opening of the epoxide. QCCs triggered new insights for the design of more active halide catalysts in future explorations of the field

Sustainable sugarcane vinasse biorefinement for trans-aconitic acid-based biopolymer synthesis and bioenergy generation

This study aimed at developing a multiproduct biorefinery scheme for vinase valorization. It involved the extraction of trans-aconitic acid, its transformation into biopolymers using microwave irradiation and the use of the raffinated-vinasse for biogas production. Each technology was assessed individually, followed by a process integration at bench scale, from which a mass balance was calculated, supporting the feasibility of the approach. As a renewable source derived from a residue, these bioproducts can replace crude-oil-based materials in various chemical industrial processes; however, a detailed techno-economic and life-cycle analysis are required to defined the sustainability of the process

The RS CVn candidate DG Ari: orbital and long cycles revealed

DG Ari (ASAS J025521+1539.4) is a variable star that was found in the search of binary stars with periods longer than 30 days in ASAS catalogue. The source shows two periodic component in its light curve. We estimate both, the orbital period, and the long-term cycle using PDM. Additionally, we present a match with the soft X-ray source 1RXSJ025521.3+153951 located at similar position. According with these results, we discuss about its nature as a RS CVn candidate

The Milky Way bar and bulge revealed by APOGEE and Gaia EDR3

We investigate the inner regions of the Milky Way using data from APOGEE and Gaia EDR3. Our inner Galactic sample has more than 26 500 stars within |XGal|< 5 kpc, |YGal|< 3.5 kpc, |ZGal|< 1 kpc, and we also carry out the analysis for a foreground-cleaned subsample of 8000 stars that is more representative of the bulge-bar populations. These samples allow us to build chemo-dynamical maps of the stellar populations with vastly improved detail. The inner Galaxy shows an apparent chemical bimodality in key abundance ratios [α/Fe], [C/N], and [Mn/O], which probe different enrichment timescales, suggesting a star formation gap (quenching) between the high- and low-α populations. Using a joint analysis of the distributions of kinematics, metallicities, mean orbital radius, and chemical abundances, we can characterize the different populations coexisting in the innermost regions of the Galaxy for the first time. The chemo-kinematic data dissected on an eccentricity-|Z|max plane reveal the chemical and kinematic signatures of the bar, the thin inner disc, and an inner thick disc, and a broad metallicity population with large velocity dispersion indicative of a pressure-supported component. The interplay between these different populations is mapped onto the different metallicity distributions seen in the eccentricity-|Z|max diagram consistently with the mean orbital radius and Vφ distributions. A clear metallicity gradient as a function of |Z|max is also found, which is consistent with the spatial overlapping of different populations. Additionally, we find and chemically and kinematically characterize a group of counter-rotating stars that could be the result of a gas-rich merger event or just the result of clumpy star formation during the earliest phases of the early disc that migrated into the bulge. Finally, based on 6D information, we assign stars a probability value of being on a bar orbit and find that most of the stars with large bar orbit probabilities come from the innermost 3 kpc, with a broad dispersion of metallicity. Even stars with a high probability of belonging to the bar show chemical bimodality in the [α/Fe] versus [Fe/H] diagram. This suggests bar trapping to be an efficient mechanism, explaining why stars on bar orbits do not show a significant, distinct chemical abundance ratio signature

VOLUMEN 24, NÚMERO 39 (2002)

ESTUDIO DEL PROCESO DE REHIDRATACIÓN DE LAS ROCAS METAMÓRFICAS DE LA FORMACIÓN SILGARÁ A PARTIR DEL ANÁLISIS COMPOSICIONAL DE LA CLORITA, REGIÓN SUROCCIDENTAL DEL MACIZO DE SANTANDER. Mantilla Figueroa, L. C.; Ríos Reyes, C. A.; Castellanos Alarcón, O. M.DETERMINACIÓN DE PALEOTEMPERATURAS EN LA CUENCA CRETÁCICA DE CAMEROS (LA RIOJA, ESPAÑA), A PARTIR DEL ESTUDIO DE CLORITAS. Mantilla Figueroa, L. C.FALLAS LONGITUDINALES Y TRANSVERSALES EN LA SABANA DE BOGOTÁ, COLOMBIA. Velandia Patiño, F. A.; De Bermoudes, O.ESTUDIO GEOQUÍMICO DE ELEMENTOS DE TIERRAS RARAS (REE) EN LAS FLUORITAS DE LAS MINAS PALESTINA (MUNICIPIO DE CEPITÁ) Y EL LLANITO (MUNICIPIO DE LOS SANTOS) EN EL DEPARTAMENTO DE SANTANDER: APORTE AL CONOCIMIENTODEL MODELO GENÉTICO. Mantilla Figueroa, L. C.; Mesa, A.CONDICIONES GEOLÓGICAS FAVORABLES DE LAS SEDIMENTITAS CRETÁCICAS DE LA CORDILLERA ORIENTAL DE COLOMBIA PARA LA EXISTENCIA DE DEPÓSITOS EXHALATIVOS SUBMARINOS DE PLOMO Y ZINC. Sarmiento Rojas, L. F.VISUALIZACIÓN EN TRES DIMENSIONES, LOS MAPAS DE AMENAZA VOLCÁNICA EDUCAN AL CIUDADANO COMÚN. Villegas, H.CÁLCULO DE LA PROBABILIDAD ABSOLUTA DE UNA NUEVA ERUPCIÓN EN LA ISLA DE ISCHIA (ITALIA). Mattera, M.EVALUACIÓN DEL RIESGO VOLCÁNICO EN LA ISLA DE ISCHIA (ITALIA). Mattera, M.METODOLOGÍA PARA LA DEFINICIÓN, EVALUACIÓN Y VALORACIÓN DEL PATRIMONIO GEOLOGICO Y SU APLICACIÓN EN LA GEOMORFOLOGÍA GLACIAR DE SANTANDER (MUNICIPIO DE VETAS). Colegial, J. D.; Pisciotti, G.; Uribe, E

VOLUMEN 24, NÚMERO 39 (2002)

ESTUDIO DEL PROCESO DE REHIDRATACIÓN DE LAS ROCAS METAMÓRFICAS DE LA FORMACIÓN SILGARÁ A PARTIR DEL ANÁLISIS COMPOSICIONAL DE LA CLORITA, REGIÓN SUROCCIDENTAL DEL MACIZO DE SANTANDER. Mantilla Figueroa, L. C.; Ríos Reyes, C. A.; Castellanos Alarcón, O. M.DETERMINACIÓN DE PALEOTEMPERATURAS EN LA CUENCA CRETÁCICA DE CAMEROS (LA RIOJA, ESPAÑA), A PARTIR DEL ESTUDIO DE CLORITAS. Mantilla Figueroa, L. C.FALLAS LONGITUDINALES Y TRANSVERSALES EN LA SABANA DE BOGOTÁ, COLOMBIA. Velandia Patiño, F. A.; De Bermoudes, O.ESTUDIO GEOQUÍMICO DE ELEMENTOS DE TIERRAS RARAS (REE) EN LAS FLUORITAS DE LAS MINAS PALESTINA (MUNICIPIO DE CEPITÁ) Y EL LLANITO (MUNICIPIO DE LOS SANTOS) EN EL DEPARTAMENTO DE SANTANDER: APORTE AL CONOCIMIENTODEL MODELO GENÉTICO. Mantilla Figueroa, L. C.; Mesa, A.CONDICIONES GEOLÓGICAS FAVORABLES DE LAS SEDIMENTITAS CRETÁCICAS DE LA CORDILLERA ORIENTAL DE COLOMBIA PARA LA EXISTENCIA DE DEPÓSITOS EXHALATIVOS SUBMARINOS DE PLOMO Y ZINC. Sarmiento Rojas, L. F.VISUALIZACIÓN EN TRES DIMENSIONES, LOS MAPAS DE AMENAZA VOLCÁNICA EDUCAN AL CIUDADANO COMÚN. Villegas, H.CÁLCULO DE LA PROBABILIDAD ABSOLUTA DE UNA NUEVA ERUPCIÓN EN LA ISLA DE ISCHIA (ITALIA). Mattera, M.EVALUACIÓN DEL RIESGO VOLCÁNICO EN LA ISLA DE ISCHIA (ITALIA). Mattera, M.METODOLOGÍA PARA LA DEFINICIÓN, EVALUACIÓN Y VALORACIÓN DEL PATRIMONIO GEOLOGICO Y SU APLICACIÓN EN LA GEOMORFOLOGÍA GLACIAR DE SANTANDER (MUNICIPIO DE VETAS). Colegial, J. D.; Pisciotti, G.; Uribe, E

Antimicrobial resistance among migrants in Europe: a systematic review and meta-analysis

BACKGROUND: Rates of antimicrobial resistance (AMR) are rising globally and there is concern that increased migration is contributing to the burden of antibiotic resistance in Europe. However, the effect of migration on the burden of AMR in Europe has not yet been comprehensively examined. Therefore, we did a systematic review and meta-analysis to identify and synthesise data for AMR carriage or infection in migrants to Europe to examine differences in patterns of AMR across migrant groups and in different settings. METHODS: For this systematic review and meta-analysis, we searched MEDLINE, Embase, PubMed, and Scopus with no language restrictions from Jan 1, 2000, to Jan 18, 2017, for primary data from observational studies reporting antibacterial resistance in common bacterial pathogens among migrants to 21 European Union-15 and European Economic Area countries. To be eligible for inclusion, studies had to report data on carriage or infection with laboratory-confirmed antibiotic-resistant organisms in migrant populations. We extracted data from eligible studies and assessed quality using piloted, standardised forms. We did not examine drug resistance in tuberculosis and excluded articles solely reporting on this parameter. We also excluded articles in which migrant status was determined by ethnicity, country of birth of participants' parents, or was not defined, and articles in which data were not disaggregated by migrant status. Outcomes were carriage of or infection with antibiotic-resistant organisms. We used random-effects models to calculate the pooled prevalence of each outcome. The study protocol is registered with PROSPERO, number CRD42016043681. FINDINGS: We identified 2274 articles, of which 23 observational studies reporting on antibiotic resistance in 2319 migrants were included. The pooled prevalence of any AMR carriage or AMR infection in migrants was 25·4% (95% CI 19·1-31·8; I2 =98%), including meticillin-resistant Staphylococcus aureus (7·8%, 4·8-10·7; I2 =92%) and antibiotic-resistant Gram-negative bacteria (27·2%, 17·6-36·8; I2 =94%). The pooled prevalence of any AMR carriage or infection was higher in refugees and asylum seekers (33·0%, 18·3-47·6; I2 =98%) than in other migrant groups (6·6%, 1·8-11·3; I2 =92%). The pooled prevalence of antibiotic-resistant organisms was slightly higher in high-migrant community settings (33·1%, 11·1-55·1; I2 =96%) than in migrants in hospitals (24·3%, 16·1-32·6; I2 =98%). We did not find evidence of high rates of transmission of AMR from migrant to host populations. INTERPRETATION: Migrants are exposed to conditions favouring the emergence of drug resistance during transit and in host countries in Europe. Increased antibiotic resistance among refugees and asylum seekers and in high-migrant community settings (such as refugee camps and detention facilities) highlights the need for improved living conditions, access to health care, and initiatives to facilitate detection of and appropriate high-quality treatment for antibiotic-resistant infections during transit and in host countries. Protocols for the prevention and control of infection and for antibiotic surveillance need to be integrated in all aspects of health care, which should be accessible for all migrant groups, and should target determinants of AMR before, during, and after migration. FUNDING: UK National Institute for Health Research Imperial Biomedical Research Centre, Imperial College Healthcare Charity, the Wellcome Trust, and UK National Institute for Health Research Health Protection Research Unit in Healthcare-associated Infections and Antimictobial Resistance at Imperial College London