Activation of H-H, HO-H, C(sp2)-H, C(sp3)-H, and RO-H bonds by transition-metal frustrated lewis pairs based onon M/N (M = Rh, Ir) couples

Reaction of the dimers (Cp*MCl)2(µ-Cl)2] (Cp* = 5-C5Me5) with Ph2PCH2CH2NC(NH(p-Tolyl))2 (H2L) in the presence of NaSbF6 affords the chlorido complexes Cp*MCl(¿2N, P-H2L)]SbF6] (M = Rh, 1; Ir, 2). Upon treatment with aqueous NaOH, solutions of 1 and 2 yield the corresponding complexes Cp*M(¿3N, N', P-HL)]SbF6] (M = Rh, 3; Ir, 4) in which the ligand HL presents a fac ¿3N, N', P coordination mode. Treatment of THF solutions of complexes 3 and 4 with hydrogen gas, at room temperature, results in the formation of the metal hydrido-complexes Cp*MH(¿2N, P-H2L)]SbF6] (M = Rh, 5; Ir, 6) in which the N(p-Tolyl) group has been protonated. Complexes 3 and 4 react with deuterated water in a reversible fashion resulting in the gradual deuteration of the Cp* group. Heating at 383 K THF/H2O solutions of the complexes 3 and 4 affords the orthometalated complexes Cp*M(¿3C, N, P-H2L-H)]SbF6] M = Rh, 7; Ir, 8, H2L-H = Ph2PCH2CH2NC(NH(p-Tolyl))(NH(4-C6H3Me))], respectively. At 333 K, complexes 3 and 4 react in THF with methanol, primary alcohols, or 2-propanol giving the metal-hydrido complexes 5 and 6, respectively. The reaction involves the acceptorless dehydrogenation of the alcohols at a relatively low temperature, without the assistance of an external base. The new complexes have been characterized by the usual analytical and spectroscopic methods including the X-ray diffraction determination of the crystal structures of complexes 1-5, 7, and 8. Notably, the chlorido complexes 1 and 2 crystallize both as enantiopure conglomerates and as racemates. Reaction mechanisms are proposed based on stoichiometric reactions, nuclear magnetic resonance studies, and X-ray crystallography as well as density functional theory calculations. © 2022 The Authors. Published by American Chemical Society

El uso de imágenes Ikonos para la cartografía de riesgo de inundación en pequeñas cuencas mediterráneas

La confección de una cartografía efectiva de riesgo de inundación precisa de la elaboración previa de mapas de peligro, que recojan las zonas sometidas a los procesos naturales asociados a la crecida. Para la configuración de estos mapas resulta muy útil el estudio de las áreas afectadas en sucesos concretos. En esta tarea el uso de la teledetección se ha demostrado altamente eficaz para el caso de grandes cuencas, afectadas por procesos de inundación extensivos y llanuras bien definidas. Sin embargo, para el caso de pequeñas cuencas mediterráneas, donde los espacios inundables son de índole muy variada, pequeña dimensión y rápido drenaje, el uso de las imágenes de satélite no siempre ha sido eficaz. La comercialización, en los último años, de imágenes de muy alta resolución (Ikonos, Quickbird) constituye una alternativa viable para la detección de las zonas afectadas en pequeñas cuencas. El presente trabajo constituye un ejemplo de uso de una imagen Ikonos para el análisis de las zonas inundadas durante el suceso de octubre del año 2000 en la Rambla de Poyo - Barranc de Torrent. Esta cuenca tiene una dimensión de 462 km2 , desemboca en la Albufera y presenta varias zonas inundables que afectan al área metropolitana de Valencia. Durante el suceso de octubre del 2000, tuvo lugar una crecida de más de 500 m3/s que dio lugar a diversos problemas de inundación, referenciados, en su día, mediante trabajo de campo y fotografía oblícua. El análisis visual de la imagen IKONOS permite establecer, de una manera rápida y completa, la extensión de la zona inundada, así como inferir los principales procesos de rotura en cauce, derrame y desbordamiento, asociados a la crecida

Significado de la celularidad peritoneal basal: más allá del diagnóstico de infección peritoneal en diálisis peritoneal

Resume

¿Existe relacion entre los parametros de composicion corporal y el riesgo de infección peritoneal (IP) en dialisis peritoneal (DP)?: estudio longitudinal

Resumen de comunicación ora

La interpretación geomorfológica en la cartografía de peligro de inundación

La interpretación geomorfológica de los procesos fluviales resulta fundamental para la elaboración de cartografía de peligro de inundación. Los ríos se comportan de una manera dinámica y pueden variar su topografía de una crecida a otra. Por ello, una cartografía de peligrosidad, excesivamente dependiente de modelos hidráulicos e hidrológicos, puede resultar ineficaz y quedarse obsoleta tras un suceso de alta energía. Conocer los elementos de geomorfología fluvial, así como sus procesos asociados permite una previsión a más largo plazo y una aproximación más realista al riesgo. En este trabajo se presentan ejemplos de interpretación geomorfológica de formas y procesos fluviales, en clave de peligro de inundación. Se han seleccionado tres cuencas de diferentes entornos morfoclimáticos que, a distintas escalas, permiten ilustrar algunos puntos donde la geomorfología propicia un determinado proceso y, en consecuencia, condiciona el tipo de peligro de la zona. La interpretación geomorfológica se ha llevado a cabo mediante trabajo de campo, de laboratorio y a partir de imágenes de satélite (RADARSAT e Ikonos)

Synchrony Matters More than Species Richness in Plant Community Stability at a Global Scale

The stability of ecological communities is critical for the stable provisioning of ecosystem services, such as food and forage production, carbon sequestration, and soil fertility. Greater biodiversity is expected to enhance stability across years by decreasing synchrony among species, but the drivers of stability in nature remain poorly resolved. Our analysis of time series from 79 datasets across the world showed that stability was associated more strongly with the degree of synchrony among dominant species than with species richness. The relatively weak influence of species richness is consistent with theory predicting that the effect of richness on stability weakens when synchrony is higher than expected under random fluctuations, which was the case in most communities. Land management, nutrient addition, and climate change treatments had relatively weak and varying effects on stability, modifying how species richness, synchrony, and stability interact. Our results demonstrate the prevalence of biotic drivers on ecosystem stability, with the potential for environmental drivers to alter the intricate relationship among richness, synchrony, and stability.National Science Foundation DEB-8114302, DEB8811884, DEB-9411972, DEB-0080382, DEB-0620652, DEB-1234162, DEB0618210National Science Foundation Research Coordination Network DEB-1042132Institute on the Environment DG-0001-13Agency of the Czech Republic GACR16-15012SCzech Academy of Sciences RVO 67985939Comunidad Autónoma de Madrid 2017-T2/AMB-5406Biotechnology and Biological Sciences Research Council BBS/E/C/000J030

Use of healthcare REsources and associated COsts in controlled versus uncontrolled carcinoid SYndrome in patients with neuroendocrine tumours: the RECOSY study

Purpose: To report healthcare resource use and associated costs in controlled versus uncontrolled carcinoid syndrome (CS) in patients with neuroendocrine tumours. Methods: A cross-sectional, non-interventional multicentre study was conducted with retrospective data analysis. Resource use was compared between two patient groups: those with controlled CS (> 12 months with no uncontrolled CS episodes) and uncontrolled CS (< 12 months since last uncontrolled episode). Patients were matched for age, sex, and origin and grade of tumour. When no matching patients were available, data from deceased patients were used. Information on healthcare resource use came from review of medical records, patient history and physician reports. Working capacity was assessed using the Work Productivity and Activity Impairment General Health questionnaire. Results: Twenty-six university hospitals in Spain participated, between July 2017 and April 2018. 137 patients were enrolled; 104 were analysed (2 groups of 52). Patients with uncontrolled CS had 10 times more emergency department (ED) visits (mean 1.0 vs 0.10 visits; P = 0.0167), were more likely to have a hospital admission (40.4% vs 19.2%; P = 0.0116) and had longer hospital stays (mean 7.87 vs 2.10 days; P = 0.0178) than those with controlled CS. This corresponded to higher annual hospitalisation costs (mean €5511.59 vs €1457.22; P = 0.028) and ED costs (€161.25 vs €14.85; P = 0.0236). The mean annual total healthcare costs were 60.0% higher in patients with uncontrolled than controlled CS (P = NS). Conclusion: This study quantifies higher health resource use, and higher hospitalisation and ED costs in patients with uncontrolled CS. Better control of CS may result 3in lower medical costs

Detailed spectroscopy of doubly magic Sn-132

The structure of the doubly magic Sn-132(50)82 has been investigated at the ISOLDE facility at CERN, populated both by the beta(-) decay of In-132 and beta(-)-delayed neutron emission of In-133. The level scheme of Sn-13(2) is greatly expanded with the addition of 68 gamma transitions and 17 levels observed for the first time in the beta decay. The information on the excited structure is completed by new gamma transitions and states populated in the beta-n decay of In-133. Improved delayed neutron emission probabilities are obtained both for In-132 and In-133. Level lifetimes are measured via the advanced time-delayed beta gamma gamma(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the N = 82 and Z = 50 shells, leading to positive- and negative-parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of Sn-132

Assessment of oceanographic services for the monitoring of highly anthropised coastal lagoons: The Mar Menor case study

Ocean monitoring systems are designed for continuous monitoring to track their evolution and anticipate environmental issues. However, they are often based on IoT systems that offer little spatial coverage and are hard to maintain. Satellite remote sensing offers good geographical coverage but they also face several challenges to become a monitoring system. This paper introduces an easy-to-use software tool to crawl water-quality data from up to 6 satellite instruments from the ESA and NASA. Particularly, Chl-a data is deeply analyzed in terms of reliability and data coverage for a highly anthropised coastal lagoon (Mar Menor, Spain), where serious socio-environmental issues are happening. Our results show a good linear correlation between in situ data and SRS data, reaching values close to 0.9, and stating the relevance of organic matter inputs from ephemeral streams in Chl-a concentrations. Moreover, temporal granularity is increased from 5 to 1.5 days by combining SRS sources.Preprin