Ablación con catéter de vías accesorias atrioventriculares de pared libre izquierda sin uso de radioscopía

Tesis doctoral inédita leída en la Universidad Autónoma de Madrid. Facultad de Medicina. Fecha de lectura: 12 de Julio de 201

Quantum walk on a cylinder

International audienceWe consider the two-dimensional alternate quantum walk on a cylinder. We concentrate on the study of the motion along the open dimension, in the spirit of looking at the closed coordinate as a small or " hidden " extra dimension. If one starts from localized initial conditions on the lattice, the dynamics of the quantum walk that is obtained after tracing out the small dimension shows the contribution of several components which can be understood from the study of the dispersion relations for this problem. In fact, these components originate from the contribution of the possible values of the quasimomentum in the closed dimension. In the continuous space-time limit, the different components manifest as a set of Dirac equations, with each quasimomentum providing the value of the corresponding mass. We briefly discuss the possible link of these ideas to the simulation of high-energy physical theories that include extra dimensions. Finally, entanglement between the coin and spatial degrees of freedom is studied, showing that the entanglement entropy clearly overcomes the value reached with only one spatial dimension

Organized Atrial Tachycardias after Atrial Fibrillation Ablation

The efficacy of catheter-based ablation techniques to treat atrial fibrillation is limited not only by recurrences of this arrhythmia but also, and not less importantly, by new-onset organized atrial tachycardias. The incidence of such tachycardias depends on the type and duration of the baseline atrial fibrillation and specially on the ablation technique which was used during the index procedure. It has been repeatedly reported that the more extensive the left atrial surface ablated, the higher the incidence of organized atrial tachycardias. The exact origin of the pathologic substrate of these trachycardias is not fully understood and may result from the interaction between preexistent regions with abnormal electrical properties and the new ones resultant from radiofrequency delivery. From a clinical point of view these atrial tachycardias tend to remit after a variable time but in some cases are responsible for significant symptoms. A precise knowledge of the most frequent types of these arrhythmias, of their mechanisms and components is necessary for a thorough electrophysiologic characterization if a new ablation procedure is required

Organized Atrial Tachycardias after Atrial Fibrillation Ablation

The efficacy of catheter-based ablation techniques to treat atrial fibrillation is limited not only by recurrences of this arrhythmia but also, and not less importantly, by new-onset organized atrial tachycardias. The incidence of such tachycardias depends on the type and duration of the baseline atrial fibrillation and specially on the ablation technique which was used during the index procedure. It has been repeatedly reported that the more extensive the left atrial surface ablated, the higher the incidence of organized atrial tachycardias. The exact origin of the pathologic substrate of these trachycardias is not fully understood and may result from the interaction between preexistent regions with abnormal electrical properties and the new ones resultant from radiofrequency delivery. From a clinical point of view these atrial tachycardias tend to remit after a variable time but in some cases are responsible for significant symptoms. A precise knowledge of the most frequent types of these arrhythmias, of their mechanisms and components is necessary for a thorough electrophysiologic characterization if a new ablation procedure is required

Hiponatremia en pacientes neurocríticos en la unidad de cuidados intensivos

Introducción: La hiponatremia es el trastorno electrolítico más frecuente en la práctica clínica. El cerebro es el principal órgano diana en relación a la morbilidad producida por esta afección, debido a la rigidez del cráneo, lo que impide su adaptación en situaciones de edema cerebral. Objetivo: Caracterizar a los pacientes neurocríticos con hiponatremia ingresados en la Unidad de Cuidados Intensivos del Hospital Universitario "General Calixto García".Métodos: Se realizó un estudio observacional, descriptivo y longitudinal. El universo estuvo constituido por 84 pacientes que ingresaron con lesiones neurológicas agudas y la muestra quedó conformada por 28 pacientes con disminución del sodio sérico. Se excluyeron aquellos pacientes cuya estadía en la terapia intensiva fue menor de 24 horas, y aquellos que no dieron su consentimiento para participar en la investigación. Las principales variables estudiadas fueron el grado de severidad de la hiponatremia, motivo de ingreso, estado al egreso, estado de la volemia y días de ventilación mecánica.Resultados: Hubo un predominio de pacientes del sexo masculino. La edad promedio fue 45,9 años. El 28,6 % de la muestra tuvo lesiones traumáticas. La mortalidad se incrementó en pacientes con hiponatremia severa. La ventilación mecánica tuvo una duración mayor de 10 días.Conclusiones: La hiponatremia se presentó con mayor frecuencia en pacientes con trauma craneoencefálico, y estuvo asociada a un peor pronóstico según se incrementó la severidad de esta

Synaptotagmins at the endoplasmic reticulum-plasma membrane contact sites maintain diacylglycerol homeostasis during abiotic stress

Endoplasmic Reticulum-Plasma Membrane contact sites (ER-PM CS) play fundamental roles in all eukaryotic cells. Arabidopsis mutants lacking the ER-PM protein tether synaptotagmin1 (SYT1) exhibit decreased plasma membrane (PM) integrity under multiple abiotic stresses such as freezing, high salt, osmotic stress and mechanical damage. Here, we show that, together with SYT1, the stress-induced SYT3 is an ER-PM tether that also functions in maintaining PM integrity. The ER-PM CS localization of SYT1 and SYT3 is dependent on PM phosphatidylinositol-4-phosphate and is regulated by abiotic stress. Lipidomic analysis revealed that cold stress increased the accumulation of diacylglycerol at the PM in a syt1/3 double mutant relative to WT while the levels of most glycerolipid species remain unchanged. Additionally, SYT1-GFP preferentially binds diacylglycerol in vivo with little affinity for polar glycerolipids. Our work uncovers a SYT-dependent mechanism of stress adaptation counteracting the detrimental accumulation of diacylglycerol at the PM produced during episodes of abiotic stress

Experimental and Theoretical Study of SbPO4 under Compression

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.9b02268.[EN] SbPO4 is a complex monoclinic layered material characterized by a strong activity of the nonbonding lone electron pair (LEP) of Sb. The strong cation LEP leads to the formation of layers piled up along the a axis and linked by weak SbO electrostatic interactions. In fact, Sb has 4-fold coordination with O similarly to what occurs with the P-O coordination, despite the large difference in ionic radii and electronegativity between both elements. Here we report a joint experimental and theoretical study of the structural and vibrational properties of SbPO4 at high pressure. We show that SbPO4 is not only one of the most compressible phosphates but also one of the most compressible compounds of the ABO(4) family. Moreover, it has a considerable anisotropic compression behavior, with the largest compression occurring along a direction close to the a axis and governed by the compression of the LEP and the weak interlayer Sb-O bonds. The strong compression along the a axis leads to a subtle modification of the monoclinic crystal structure above 3 GPa, leading from a 2D to a 3D material. Moreover, the onset of a reversible pressure-induced phase transition is observed above 9 GPa, which is completed above 20 GPa. We propose that the high-pressure phase is a triclinic distortion of the original monoclinic phase. The understanding of the compression mechanism of SbPO4 can aid to improve the ion intercalation and catalytic properties of this layered compound.The authors acknowledge financial support from the Brazilian Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq - 159754/2018-6, 307199/2018-5, 422250/20163, 201050/2012-9), FAPESP (2013/07793-6), Spanish Ministerio de Economia y Competitividad (MINECO) under projects MALTA Consolider Ingenio 2010 network (MAT2015-71070-REDC and RED2018-102612-T), MAT2016-75586-C4-1/2/3-P, PGC2018-097520-A-I00, FIS2017-83295-P, and PGC2018-094417-B-I00 from Generalitat Valenciana under project PROMETEO/2018/123, and the European Comission under project COMEX. D.S.-P., JA.S., and A.O.d.l.R. acknowledge "Ramim y Cajal" Fellowships for financial support (RyC-2014-15643, RYC-2015-17482, and RyC-2016-20301, respectively). E.L.d. S., A.M., A.B., and P.R-.H. acknowledge computing time provided by Red Espanola de SupercomputaciOn (RES) and MALTA-Cluster.Pereira, ALDJ.; Santamaria-Pérez, D.; Vilaplana Cerda, RI.; Errandonea, D.; Popescu, C.; Da Silva, EL.; Sans-Tresserras, JÁ.... (2020). Experimental and Theoretical Study of SbPO4 under Compression. Inorganic Chemistry. 59(1):287-307. https://doi.org/10.1021/acs.inorgchem.9b02268S287307591Falcão Filho, E. L., Bosco, C. A. C., Maciel, G. S., de Araújo, C. B., Acioli, L. H., Nalin, M., & Messaddeq, Y. (2003). Ultrafast nonlinearity of antimony polyphosphate glasses. Applied Physics Letters, 83(7), 1292-1294. doi:10.1063/1.1601679Nalin, M., Poulain, M., Poulain, M., Ribeiro, S. J. ., & Messaddeq, Y. (2001). Antimony oxide based glasses. Journal of Non-Crystalline Solids, 284(1-3), 110-116. doi:10.1016/s0022-3093(01)00388-xNalin, M., Messaddeq, Y., Ribeiro, S. J. L., Poulain, M., Briois, V., Brunklaus, G., … Eckert, H. (2004). Structural organization and thermal properties of the Sb2O3–SbPO4glass system. J. Mater. Chem., 14(23), 3398-3405. doi:10.1039/b406075jMontesso, M., Manzani, D., Donoso, J. P., Magon, C. J., Silva, I. D. A., Chiesa, M., … Nalin, M. (2018). Synthesis and structural characterization of a new SbPO4-GeO2 glass system. Journal of Non-Crystalline Solids, 500, 133-140. doi:10.1016/j.jnoncrysol.2018.07.005Wang, Y., li, L., & Li, G. (2012). One-step synthesis of SbPO4 hollow spheres by a self-sacrificed template method. RSC Advances, 2(33), 12999. doi:10.1039/c2ra21434bChen, S., Di, Y., Li, T., Li, F., & Cao, W. (2018). Impacts of ionic liquid capping on the morphology and photocatalytic performance of SbPO4 crystals. CrystEngComm, 20(30), 4305-4312. doi:10.1039/c8ce00790jSaadaoui, H., Boukhari, A., Flandrois, S., & Aride, J. (1994). Intercalation of Hydrazine and Amines in Antimony Phosphate. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 244(1), 173-178. doi:10.1080/10587259408050100Biswal, J. B., Garje, S. S., & Revaprasadu, N. (2014). A convenient synthesis of antimony sulfide and antimony phosphate nanorods using single source dithiolatoantimony(III) dialkyldithiophosphate precursors. Polyhedron, 80, 216-222. doi:10.1016/j.poly.2014.04.017Ou, M., Ling, Y., Ma, L., Liu, Z., Luo, D., & Xu, L. (2018). Synthesis and Li-storage property of flower-like SbPO4 microspheres. Materials Letters, 224, 100-104. doi:10.1016/j.matlet.2018.04.059Jones, P. G., Sheldrick, G. M., & Schwarzmann, E. (1980). Antimony(III) arsenic(V) oxide. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 36(8), 1923-1925. doi:10.1107/s0567740880007492Kinberger, B., Danielsen, J., Haaland, A., Jerslev, B., Schäffer, C. E., Sunde, E., & Sørensen, N. A. (1970). The Crystal Structure of SbPO4. Acta Chemica Scandinavica, 24, 320-328. doi:10.3891/acta.chem.scand.24-0320Achary, S. N., Errandonea, D., Muñoz, A., Rodríguez-Hernández, P., Manjón, F. J., Krishna, P. S. R., … Tyagi, A. K. (2013). Experimental and theoretical investigations on the polymorphism and metastability of BiPO4. Dalton Transactions, 42(42), 14999. doi:10.1039/c3dt51823jAlonzo, G., Bertazzi, N., Galli, P., Marci, G., Massucci, M. A., Palmisano, L., … Saiano, F. (1998). In search of layered antimony(III) materials: synthesis and characterization of oxo-antimony(III) catecholate and further studies on antimony(III) phosphate. Materials Research Bulletin, 33(8), 1233-1240. doi:10.1016/s0025-5408(98)00095-6Alonzo, G., Bertazzi, N., Galli, P., Massucci, M. A., Patrono, P., & Saiano, F. (1998). On the synthesis and characterization of layered antimony(III) phosphate and its interaction with moist ammonia and amines. Materials Research Bulletin, 33(8), 1221-1231. doi:10.1016/s0025-5408(98)00094-4Brockner, W., & Hoyer, L. P. (2002). Synthesis and vibrational spectrum of antimony phosphate, SbPO4. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 58(9), 1911-1914. doi:10.1016/s1386-1425(01)00639-4Sudarsan, V., Muthe, K. ., Vyas, J. ., & Kulshreshtha, S. . (2002). PO43− tetrahedra in SbPO4 and SbOPO4: a 31P NMR and XPS study. Journal of Alloys and Compounds, 336(1-2), 119-123. doi:10.1016/s0925-8388(01)01888-6Errandonea, D., Gomis, O., Santamaría-Perez, D., García-Domene, B., Muñoz, A., Rodríguez-Hernández, P., … Popescu, C. (2015). Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorph. Journal of Applied Physics, 117(10), 105902. doi:10.1063/1.4914407Lacomba-Perales, R., Errandonea, D., Meng, Y., & Bettinelli, M. (2010). High-pressure stability and compressibility ofAPO4(A=La, Nd, Eu, Gd, Er, and Y) orthophosphates: An x-ray diffraction study using synchrotron radiation. Physical Review B, 81(6). doi:10.1103/physrevb.81.064113Errandonea, D., Gomis, O., Rodríguez-Hernández, P., Muñoz, A., Ruiz-Fuertes, J., Gupta, M., … Bettinelli, M. (2018). High-pressure structural and vibrational properties of monazite-type BiPO4, LaPO4, CePO4, and PrPO4. Journal of Physics: Condensed Matter, 30(6), 065401. doi:10.1088/1361-648x/aaa20dLópez-Solano, J., Rodríguez-Hernández, P., Muñoz, A., Gomis, O., Santamaría-Perez, D., Errandonea, D., … Raptis, C. (2010). Theoretical and experimental study of the structural stability ofTbPO4at high pressures. Physical Review B, 81(14). doi:10.1103/physrevb.81.144126Musselman, M. A., Wilkinson, T. M., Haberl, B., & Packard, C. E. (2018). In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline Tb PO 4 , Dy PO 4 , and Gd x Dy (1− x ) PO 4. Journal of the American Ceramic Society, 101(6), 2562-2570. doi:10.1111/jace.15374Muñoz, A., & Rodríguez-Hernández, P. (2018). High-Pressure Elastic, Vibrational and Structural Study of Monazite-Type GdPO4 from Ab Initio Simulations. Crystals, 8(5), 209. doi:10.3390/cryst8050209Ghosh, P. S., Ali, K., & Arya, A. (2018). A computational study of high pressure polymorphic transformations in monazite-type LaPO4. Physical Chemistry Chemical Physics, 20(11), 7621-7634. doi:10.1039/c7cp05587kGomis, O., Lavina, B., Rodríguez-Hernández, P., Muñoz, A., Errandonea, R., Errandonea, D., & Bettinelli, M. (2017). High-pressure structural, elastic, and thermodynamic properties of zircon-type HoPO4and TmPO4. Journal of Physics: Condensed Matter, 29(9), 095401. doi:10.1088/1361-648x/aa516aRuiz-Fuertes, J., Hirsch, A., Friedrich, A., Winkler, B., Bayarjargal, L., Morgenroth, W., … Milman, V. (2016). High-pressure phase of LaPO4 studied by x-ray diffraction and second harmonic generation. Physical Review B, 94(13). doi:10.1103/physrevb.94.134109Stavrou, E., Tatsi, A., Raptis, C., Efthimiopoulos, I., Syassen, K., Muñoz, A., … Hanfland, M. (2012). Effects of pressure on the structure and lattice dynamics of TmPO4: Experiments and calculations. Physical Review B, 85(2). doi:10.1103/physrevb.85.024117Errandonea, D., & Garg, A. B. (2018). Recent progress on the characterization of the high-pressure behaviour of AVO4 orthovanadates. Progress in Materials Science, 97, 123-169. doi:10.1016/j.pmatsci.2018.04.004Bandiello, E., Errandonea, D., Pellicer-Porres, J., Garg, A. B., Rodriguez-Hernandez, P., Muñoz, A., … Popescu, C. (2018). Effect of High Pressure on the Crystal Structure and Vibrational Properties of Olivine-Type LiNiPO4. Inorganic Chemistry, 57(16), 10265-10276. doi:10.1021/acs.inorgchem.8b01495Achary, S. N., Bevara, S., & Tyagi, A. K. (2017). Recent progress on synthesis and structural aspects of rare-earth phosphates. Coordination Chemistry Reviews, 340, 266-297. doi:10.1016/j.ccr.2017.03.006Bykov, M., Bykova, E., Hanfland, M., Liermann, H.-P., Kremer, R. K., Glaum, R., … van Smaalen, S. (2016). High-Pressure Phase Transformations in TiPO4: A Route to Pentacoordinated Phosphorus. Angewandte Chemie International Edition, 55(48), 15053-15057. doi:10.1002/anie.201608530López-Moreno, S., & Errandonea, D. (2012). Ab initioprediction of pressure-induced structural phase transitions of CrVO4-type orthophosphates. Physical Review B, 86(10). doi:10.1103/physrevb.86.104112Errandonea, D., & Manjón, F. J. (2008). Pressure effects on the structural and electronic properties of ABX4 scintillating crystals. Progress in Materials Science, 53(4), 711-773. doi:10.1016/j.pmatsci.2008.02.001Merrill, L., & Bassett, W. A. (1974). Miniature diamond anvil pressure cell for single crystal x‐ray diffraction studies. Review of Scientific Instruments, 45(2), 290-294. doi:10.1063/1.1686607Fauth, F., Peral, I., Popescu, C., & Knapp, M. (2013). The new Material Science Powder Diffraction beamline at ALBA Synchrotron. Powder Diffraction, 28(S2), S360-S370. doi:10.1017/s0885715613000900Mao, H. K., Xu, J., & Bell, P. M. (1986). Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions. Journal of Geophysical Research, 91(B5), 4673. doi:10.1029/jb091ib05p04673Dewaele, A., Loubeyre, P., & Mezouar, M. (2004). Equations of state of six metals above94GPa. Physical Review B, 70(9). doi:10.1103/physrevb.70.094112Prescher, C., & Prakapenka, V. B. (2015). DIOPTAS: a program for reduction of two-dimensional X-ray diffraction data and data exploration. High Pressure Research, 35(3), 223-230. doi:10.1080/08957959.2015.1059835Rodríguez-Carvajal, J. (1993). Recent advances in magnetic structure determination by neutron powder diffraction. Physica B: Condensed Matter, 192(1-2), 55-69. doi:10.1016/0921-4526(93)90108-iErrandonea, D., Muñoz, A., & Gonzalez-Platas, J. (2014). Comment on «High-pressure x-ray diffraction study of YBO3/Eu3+, GdBO3, and EuBO3: Pressure-induced amorphization in GdBO3» [J. Appl. Phys. 115, 043507 (2014)]. Journal of Applied Physics, 115(21), 216101. doi:10.1063/1.4881057Hohenberg, P., & Kohn, W. (1964). Inhomogeneous Electron Gas. Physical Review, 136(3B), B864-B871. doi:10.1103/physrev.136.b864Kresse, G., & Hafner, J. (1993). Ab initiomolecular dynamics for liquid metals. Physical Review B, 47(1), 558-561. doi:10.1103/physrevb.47.558Blöchl, P. E. (1994). Projector augmented-wave method. Physical Review B, 50(24), 17953-17979. doi:10.1103/physrevb.50.17953Perdew, J. P., Ruzsinszky, A., Csonka, G. I., Vydrov, O. A., Scuseria, G. E., Constantin, L. A., … Burke, K. (2008). Restoring the Density-Gradient Expansion for Exchange in Solids and Surfaces. Physical Review Letters, 100(13). doi:10.1103/physrevlett.100.136406Monkhorst, H. J., & Pack, J. D. (1976). Special points for Brillouin-zone integrations. Physical Review B, 13(12), 5188-5192. doi:10.1103/physrevb.13.5188Parlinski, K. Computer Code PHONON; http://wolf.ifj.edu.pl/phonon.Nielsen, O. H., & Martin, R. M. (1985). Quantum-mechanical theory of stress and force. Physical Review B, 32(6), 3780-3791. doi:10.1103/physrevb.32.3780Le Page, Y., & Saxe, P. (2002). Symmetry-general least-squares extraction of elastic data for strained materials fromab initiocalculations of stress. Physical Review B, 65(10). doi:10.1103/physrevb.65.104104Otero-de-la-Roza, A., Johnson, E. R., & Luaña, V. (2014). Critic2: A program for real-space analysis of quantum chemical interactions in solids. Computer Physics Communications, 185(3), 1007-1018. doi:10.1016/j.cpc.2013.10.026Dewhurst, K.; Sharma, S.; Nordström, L.; Cricchio, F.; Grånäs, O.; Gross, H.; Ambrosch-Draxl, C.; Persson, C.; Bultmark, F.; Brouder, C., The Elk FP-LAPW code; http://elk.sourceforge.net/ (accessed Oct 31, 2019).Manjón, F. J., Vilaplana, R., Gomis, O., Pérez-González, E., Santamaría-Pérez, D., Marín-Borrás, V., … Muñoz-Sanjosé, V. (2013). High-pressure studies of topological insulators Bi2Se3, Bi2Te3, and Sb2Te3. physica status solidi (b), 250(4), 669-676. doi:10.1002/pssb.201200672Pereira, A. L. J., Errandonea, D., Beltrán, A., Gracia, L., Gomis, O., Sans, J. A., … Popescu, C. (2013). Structural study of α-Bi2O3under pressure. Journal of Physics: Condensed Matter, 25(47), 475402. doi:10.1088/0953-8984/25/47/475402Pereira, A. L. J., Gomis, O., Sans, J. A., Pellicer-Porres, J., Manjón, F. J., Beltran, A., … Muñoz, A. (2014). Pressure effects on the vibrational properties ofα-Bi2O3: an experimental and theoretical study. Journal of Physics: Condensed Matter, 26(22), 225401. doi:10.1088/0953-8984/26/22/225401Pereira, A. L. J., Sans, J. A., Vilaplana, R., Gomis, O., Manjón, F. J., Rodríguez-Hernández, P., … Beltrán, A. (2014). Isostructural Second-Order Phase Transition of β-Bi2O3 at High Pressures: An Experimental and Theoretical Study. The Journal of Physical Chemistry C, 118(40), 23189-23201. doi:10.1021/jp507826jIbáñez, J., Sans, J. A., Popescu, C., López-Vidrier, J., Elvira-Betanzos, J. J., Cuenca-Gotor, V. P., … Muñoz, A. (2016). Structural, Vibrational, and Electronic Study of Sb2S3 at High Pressure. The Journal of Physical Chemistry C, 120(19), 10547-10558. doi:10.1021/acs.jpcc.6b01276Kroumova, E., Aroyo, M. I., Perez-Mato, J. M., Kirov, A., Capillas, C., Ivantchev, S., & Wondratschek, H. (2003). Bilbao Crystallographic Server : Useful Databases and Tools for Phase-Transition Studies. Phase Transitions, 76(1-2), 155-170. doi:10.1080/0141159031000076110Canepa, P., Hanson, R. M., Ugliengo, P., & Alfredsson, M. (2010). J-ICE: a newJmolinterface for handling and visualizing crystallographic and electronic properties. Journal of Applied Crystallography, 44(1), 225-229. doi:10.1107/s0021889810049411Sans, J. A., Manjón, F. J., Pereira, A. L. J., Vilaplana, R., Gomis, O., Segura, A., … Ruleova, P. (2016). Structural, vibrational, and electrical study of compressed BiTeBr. Physical Review B, 93(2). doi:10.1103/physrevb.93.024110Pereira, A. L. J., Santamaría-Pérez, D., Ruiz-Fuertes, J., Manjón, F. J., Cuenca-Gotor, V. P., Vilaplana, R., … Sans, J. A. (2018). Experimental and Theoretical Study of Bi2O2Se Under Compression. The Journal of Physical Chemistry C, 122(16), 8853-8867. doi:10.1021/acs.jpcc.8b02194Bai, Y., Srikanth, N., Chua, C. K., & Zhou, K. (2017). Density Functional Theory Study of Mn+1AXn Phases: A Review. Critical Reviews in Solid State and Materials Sciences, 44(1), 56-107. doi:10.1080/10408436.2017.1370577An ab initio study on compressibility of Al-containing MAX-phase carbides. (2013). Journal of Applied Physics, 114(17), 173709. doi:10.1063/1.4829282Bai, Y., Qi, X., He, X., Sun, D., Kong, F., Zheng, Y., … Duff, A. I. (2018). Phase stability and weak metallic bonding within ternary‐layered borides CrAlB, Cr 2 AlB 2 , Cr 3 AlB 4 , and Cr 4 AlB 6. Journal of the American Ceramic Society, 102(6), 3715-3727. doi:10.1111/jace.16206Birch, F. (1978). Finite strain isotherm and velocities for single-crystal and polycrystalline NaCl at high pressures and 300°K. Journal of Geophysical Research, 83(B3), 1257. doi:10.1029/jb083ib03p01257Pereira, A. L. J., Gomis, O., Sans, J. A., Contreras-García, J., Manjón, F. J., Rodríguez-Hernández, P., … Beltrán, A. (2016). β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis. Physical Review B, 93(22). doi:10.1103/physrevb.93.224111Cuenca-Gotor, V. P., Sans, J. A., Ibáñez, J., Popescu, C., Gomis, O., Vilaplana, R., … Bergara, A. (2016). Structural, Vibrational, and Electronic Study of α-As2Te3 under Compression. The Journal of Physical Chemistry C, 120(34), 19340-19352. doi:10.1021/acs.jpcc.6b06049Korabel’nikov, D. V., & Zhuravlev, Y. N. (2018). Structural, elastic, electronic and vibrational properties of a series of sulfates from first principles calculations. Journal of Physics and Chemistry of Solids, 119, 114-121. doi:10.1016/j.jpcs.2018.03.037Santamaría-Pérez, D., Gracia, L., Garbarino, G., Beltrán, A., Chuliá-Jordán, R., Gomis, O., … Segura, A. (2011). High-pressure study of the behavior of mineral barite by x-ray diffraction. Physical Review B, 84(5). doi:10.1103/physrevb.84.054102Santamaria-Perez, D., Chulia-Jordan, R., Daisenberger, D., Rodriguez-Hernandez, P., & Muñoz, A. (2019). Dense Post-Barite-type Polymorph of PbSO4 Anglesite at High Pressures. Inorganic Chemistry, 58(4), 2708-2716. doi:10.1021/acs.inorgchem.8b03254Hinrichsen, B., Dinnebier, R. E., Liu, H., & Jansen, M. (2008). The high pressure crystal structures of tin sulphate: a case study for maximal information recovery from 2D powder diffraction data. Zeitschrift für Kristallographie - Crystalline Materials, 223(3), 195-203. doi:10.1524/zkri.2008.0017Knight, K. S. (2010). Analytical expressions to determine the isothermal compressibility tensor and the isobaric thermal expansion tensor for monoclinic crystals: application to determine the direction of maximum compressibility in jadeite. Physics and Chemistry of Minerals, 37(8), 529-533. doi:10.1007/s00269-009-0353-8Angel, R. J. Win_Strain; http://www.rossangel.com/text_strain.htm.Errandonea, D., Muñoz, A., Rodríguez-Hernández, P., Gomis, O., Achary, S. N., Popescu, C., … Tyagi, A. K. (2016). High-Pressure Crystal Structure, Lattice Vibrations, and Band Structure of BiSbO4. Inorganic Chemistry, 55(10), 4958-4969. doi:10.1021/acs.inorgchem.6b00503Bodenstein, D., Brehm, A., Jones, P. G., Schwarzmann, E., & Sheldrick, G. M. (1982). Darstellung und Kristallstruktur von Arsen(III)phosplior(V)oxid, AsPO4 / Preparation and Crystal Structure of Arsenic(III) Phosphorus(V) Oxide, AsPO4. Zeitschrift für Naturforschung B, 37(2), 136-137. doi:10.1515/znb-1982-0203Ruiz-Fuertes, J., Friedrich, A., Gomis, O., Errandonea, D., Morgenroth, W., Sans, J. A., & Santamaría-Pérez, D. (2015). High-pressure structural phase transition inMnWO4. Physical Review B, 91(10). doi:10.1103/physrevb.91.104109Garg, A. B., Errandonea, D., Rodríguez-Hernández, P., & Muñoz, A. (2016). ScVO4under non-hydrostatic compression: a new metastable polymorph. Journal of Physics: Condensed Matter, 29(5), 055401. doi:10.1088/1361-648x/29/5/055401Momma, K., & Izumi, F. (2011). VESTA 3for three-dimensional visualization of crystal, volumetric and morphology data. Journal of Applied Crystallography, 44(6), 1272-1276. doi:10.1107/s0021889811038970Hoppe, R. (1970). The Coordination Number– an«Inorganic Chameleon». Angewandte Chemie International Edition in English, 9(1), 25-34. doi:10.1002/anie.197000251Hoppe, R. (1979). Effective coordination numbers (ECoN) and mean fictive ionic radii (MEFIR). Zeitschrift für Kristallographie - Crystalline Materials, 150(1-4), 23-52. doi:10.1524/zkri.1979.150.14.23Baur, W. H. (1974). The geometry of polyhedral distortions. Predictive relationships for the phosphate group. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 30(5), 1195-1215. doi:10.1107/s0567740874004560Guńka, P. A., & Zachara, J. (2019). Towards a quantitative bond valence description of coordination spheres – the concepts of valence entropy and valence diversity coordination numbers. Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, 75(1), 86-96. doi:10.1107/s2052520618017833Ruiz-Fuertes, J., Segura, A., Rodríguez, F., Errandonea, D., & Sanz-Ortiz, M. N. (2012). An

Integrated Ugi-Based Assembly of Functionally, Skeletally, and Stereochemically Diverse 1,4-Benzodiazepin-2-ones

A practical, integrated and versatile U-4CR-based assembly of 1,4-benzodiazepin-2-ones exhibiting functionally, skeletally, and stereochemically diverse substitution patterns is described. By virtue of its convergence, atom economy, and bond-forming efficiency, the methodology documented herein exemplifies the reconciliation of structural complexity and experimental simplicity in the context of medicinal chemistry projects.This work was financially supported by the Galician Government (Spain), Projects: 09CSA016234PR and GPC-2014-PG037. J.A. thanks FUNDAYACUCHO (Venezuela) for a predoctoral grant and Deputación da Coruña (Spain) for a postdoctoral research grant. A.N.-V. thanks the Spanish government for a Ramón y Cajal research contract

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio