146 research outputs found

    Crustaceans (Decapoda & Stomatopoda) from Golfo Dulce (Pacific, Costa Rica) in the collection of the Museum of Zoology, University of Costa Rica

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    Introduction: The availability of recently updated lists of species from a particular area is an important first step to evaluate changes in species composition and abundance. Golfo Dulce is a fjord-like embayment with relatively pristine shores and relatively deep waters (200m) that have been sampled occasionally for crustaceans. Methods: In this study the all species from Golfo Dulce deposited in the collection of the University of Costa Rica Museum of Zoology were listed and scientific names were updated. The MZUCR catalog number, station, substrate type, and year or collection were included for each species. Results: A total of 106 species were listed. Neogonodactylus zacae was present in four of the 19 stations represented in the collections for Golfo Dulce. Nine species were present in three stations, 19 in two stations and the remaining 77 in one station each. The families with most species were Ocypodidae y Palaemonidae (7) and Porcellanidae (14). Conclusions: Is necessary to improve our knowledge of the decapods and stomatopods fauna from Golfo Dulce through further samplings. Intertidal sites such as Golfito and Rincón bays have been poorly sampled as well as intertidal and subtidal environment from the western and eastern shores. However, the fauna is relatively rich when it is related to the area of Golfo Dulce (750km2) and is indicative of a relatively undisturbed environment. Updated management policies are urgently needed and this list of species is a step towards this goalRESUMEN. “Crustáceos (Decapoda & Stomatopoda) del Golfo Dulce (Pacífico, Costa Rica) en la colección del Museo de Zoología, Universidad de Costa Rica”.Introducción: Laslistas actualizadas de especies son un primer paso para evaluar cambios temporales en composición y abundancia. Golfo Dulce es un cuerpo de agua marino semejante a un fiordo, con costas poco alteradas y aguas relativamente profundas (200m). Métodos: Elaboramosuna lista taxonómicamente actualizada de las especies de macro-crustáceos recolectados en Golfo Dulce y depositadas en la colección del Museo de Zoología de la Universidad de Costa Rica (MZUCR). El número de catálogo del MZUCR, estación, tipo de sustrato, y año de colecta fueron anotados para cada especie. Resultados: Hay106 especies en la lista. Neogonodactylus zacaeestuvo en cuatro de las 19 estaciones representadas en las colecciones para Golfo Dulce. Nueve especies en tres estaciones, 19 en dos estaciones y las restantes 77 en una estación cada una. Las familias conmás especies fueron Ocypodidae y Palaemonidae (7) y Porcellanidae(14). Conclusiones: Se requieren más muestreos, particularmente en sitios entre mareas como las bahías de Golfito y Rincón; y fondos de entre mareas y submareales de las costas oeste y este. La fauna es relativamente rica considerando el área de Golfo Dulce (750 km2) y es indicadora de un ambiente relativamente inalterado. Se requiere urgentemente de políticas de manejo actualizadas y esta lista en un paso hacia ese objetivoUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Biodiversidad y Ecología Tropical (CIBET)UCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de BiologíaUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR

    Museum specimens and occurrences of Glottidia audebarti, Discradisca strigata and other brachiopods (Brachiopoda) in the Pacific of Costa Rica

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    Introduction: Lamp shells or brachiopods have a rich fossil record but only about 400 extant species. Their diversity on the Eastern Pacific is poorly known and only eight species are reported for the Pacific of Costa Rica. Objective: To list the specimens from Costa Rica and provide a distribution map along its Pacific coast. Methods: We checked collections at the University of Costa Rica (MZ-UCR) and Scripps Institution of Oceanography. Results: We found 22 records at MZ-UCR and 10 at Scripps, both include unidentified specimens, as well as Glottidia audebarti and Discradisca strigata, which are frequently collected intertidally. Conclusion: The study of Eastern Pacific living brachiopods is at an early stage; ecological studies could focus on the more easily accessed intertidal species

    Confined benzene within InOF-1: Contrasting CO2 and SO2 capture behaviours

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    The confinement of small amounts of benzene in InOF-1 (Bz@InOF-1) shows a contradictory behavior in the capture of CO2 and SO2. While the capture of CO2 is increased 1.6 times, compared to the pristine material, the capture of SO2 shows a considerable decrease. To elucidate these behaviors, the interactions of CO2 and SO2 with Bz@InOF-1 were studied by DFT periodical calculations postulating a plausible explanation: (a) in the case of benzene and CO2, these molecules do not compete for the preferential adsorption sites within InOF-1, providing a cooperative CO2 capture enhancement and (b) benzene and SO2 strongly compete for these preferential adsorption sites inside the MOF material, reducing the total SO2 capture

    Pull-out and push-in tests of bonded steel strands

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    Martí Vargas, JR. (2013). Pull-out and push-in tests of bonded steel strands. Magazine of Concrete Research. 65(18):1128-1131. doi:10.1680/macr.13.00061S112811316518Balázs LG .Bond Model with Non-Linear Bond-Slip Law, 1987, Politecnico di Milano, Italy, 395–430, Studi e Ricerche, Post-Graduate Course for Reinforced Concrete Structures, V.8/86.Balazs, G. L. (1992). Transfer Control of Prestressing Strands. PCI Journal, 37(6), 60-71. doi:10.15554/pcij.11011992.60.71Balazs, G. L. (1993). Transfer Length of Prestressing Strand as a Function of Draw-In and Initial Prestress. PCI Journal, 38(2), 86-93. doi:10.15554/pcij.03011993.86.93Balázs, G. L. (2007). Connecting Reinforcement to Concrete by Bond. Beton- und Stahlbetonbau, 102(S1), 46-50. doi:10.1002/best.200710109Carmo RNF .Ancoragem de Armaduras Pré-Esforçadas por Pré-Tensão. MSc thesis, 1999, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Portugal, (in Portuguese).Faria, D. M. V., Lúcio, V. J. G., & Pinho Ramos, A. (2011). Pull-out and push-in tests of bonded steel strands. Magazine of Concrete Research, 63(9), 689-705. doi:10.1680/macr.2011.63.9.689Faria, D. M. V., Lúcio, V. J. G., & Ramos, A. P. (2011). Strengthening of flat slabs with post-tensioning using anchorages by bonding. Engineering Structures, 33(6), 2025-2043. doi:10.1016/j.engstruct.2011.02.039Faria, D. M. V., Lúcio, V. J. G., & Pinho Ramos, A. (2012). Post-punching behaviour of flat slabs strengthened with a new technique using post-tensioning. Engineering Structures, 40, 383-397. doi:10.1016/j.engstruct.2012.03.014Laldji S .Bond Characteristics of Prestressing Strand in Grout. MPhil thesis, 1987, University of Leicester, UK.Laldji, S., & Young, A. G. (1988). Bond between steel strand and cement grout in ground anchorages. Magazine of Concrete Research, 40(143), 90-98. doi:10.1680/macr.1988.40.143.90Lopes, S. M. R., & do Carmo, R. N. F. (2002). Bond of prestressed strands to concrete: transfer rate and relationship between transmission length and tendon draw-in. Structural Concrete, 3(3), 117-126. doi:10.1680/stco.2002.3.3.117Martí-Vargas, J. R., Serna-Ros, P., Fernández-Prada, M. A., Miguel-Sosa, P. F., & Arbeláez, C. A. (2006). Test method for determination of the transmission and anchorage lengths in prestressed reinforcement. Magazine of Concrete Research, 58(1), 21-29. doi:10.1680/macr.2006.58.1.21Marti-Vargas, J. R., Arbelaez, C. A., Serna-Ros, P., Navarro-Gregori, J., & Pallares-Rubio, L. (2007). Analytical model for transfer length prediction of 13 mm prestressing strand. Structural Engineering and Mechanics, 26(2), 211-229. doi:10.12989/sem.2007.26.2.211Palmer, K. D., & Schultz, A. E. (2011). Experimental investigation of the web-shear strength of deep hollow-core units. PCI Journal, 56(4), 83-104. doi:10.15554/pcij.09012011.83.10

    Proceso agrario en Bolivia y América Latina

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    El material esta distribuido en cinco partes. La primera está referida a los resultados y perspectivas de la Reforma Agraria en Bolivia. Está dividida en tres temáticas: la Reforma Agraria en las Tierras Altas, la Reforma Agraria en las Tierras Bajas y la Reforma Agraria en el Chaco. La segunda parte contiene las intervenciones realizadas por los invitados extranjeros sobre los resultados y perspectivas de la Reforma Agraria en América Latina y en México, Perú y Ecuador. La tercera parte corresponde a las intervenciones de los representantes de las organizaciones indígenas y campesinas bolivianas, que fueron invitados para debatir el tema Tierra, Democracia y Poder. Esta parte esta precedida por un recuento general de la situación de los Movimientos Indígenas-Campesinos en América Latina y sus perspectivas. La cuarta da cuenta de las intervenciones hechas por los representantes de las organizaciones de productores agrarios, campesinos y empresarios, quienes fueron invitados para debatir el tema Tierra, Economía e Integración. La última parte es una síntesis de las ideas y aspectos relevantes producto de las exposiciones y de las preguntas de los asistentes al seminario, que dejaron una estela de inquietudes e iniciativas que son el eslabón para futuros debates en otros espacios de reflexión en diferentes lugares del país, con la participación de actores y pensadores, operadores y promotores del desarrollo rural.Presentación 7; Introducción 8; La Reforma Agraria abandonada: valles y altiplano, Miguel Urioste F. de C. 19; Medio siglo de Reforma Agraria boliviana, Danilo Paz Ballivián 53; La tierra es de quien la trabaja, René Salomón Vargas 65; La Reforma Agraria en las tierras bajas de Bolivia, Carlos Romero Bonifaz 83; Lógicas de ocupación territorial en la agricultura y la forestería empresarial en las tierras bajas, Alan Bojanic 127; Antecedentes, situación actual y recomendaciones en la tenencia de la tierra en el oriente boliviano, Cámara Agropecuaria del Oriente 137; 50 años de la Reforma Agraria en el Chaco boliviano, Oscar Bazoberry Chali 145; Resultados de los cambios introducidos por la Reforma Agraria, Erwin Galoppo von Borries 177; La Reforma Agraria en Bolivia y el MST, Ermelinda Fernández Bamba 191; La Reforma Agraria en América Latina, Jacques Chonchol 205; De rústicas revueltas: Añoranza y utopía en el México rural, Armando Bartra 223; Reforma y contrarreforma agraria en el Perú, Laureano del Castillo Pinto 255; Reforma Agraria en el Ecuador, Fausto Jordán B. 285; 50 años después, emergencia étnica, Xavier Albó 321; Tierra, mujer y desarrollo, María Machaca 329; Tierra y territorio comunitario, Bienvenido Zacu 333; Tierra, migración y colonización, José Luis Méndez Chaurara 341; Tierra, coca y desarrollo, Dionisio Núñez 355; Tierra para todos, Ángel Durán 359; Tierra y producción orgánica, Mario R. Cordero Camacho 367; Tierra y producción campesina, María Julia Jiménez 377; Tierra y Territorio y Políticas para la Tierra, Elizabeth Jiménez Zamora 385; Ideas y aspectos relevantes del Seminario, John D.Vargas Vega 429

    The Tree Biodiversity Network (BIOTREE-NET): prospects for biodiversity research and conservation in the Neotropics

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    Biodiversity research and conservation efforts in the tropics are hindered by the lack of knowledge of the assemblages found there, with many species undescribed or poorly known. Our initiative, the Tree Biodiversity Network (BIOTREE-NET), aims to address this problem by assembling georeferenced data from a wide range of sources, making these data easily accessible and easily queried, and promoting data sharing. The database (GIVD ID NA-00-002) currently comprises ca. 50,000 tree records of ca. 5,000 species (230 in the IUCN Red List) from \u3e2,000 forest plots in 11 countries. The focus is on trees because of their pivotal role in tropical forest ecosystems (which contain most of the world\u27s biodiversity) in terms of ecosystem function, carbon storage and effects on other species. BIOTREE-NET currently focuses on southern Mexico and Central America, but we aim to expand coverage to other parts of tropical America. The database is relational, comprising 12 linked data tables. We summarise its structure and contents. Key tables contain data on forest plots (including size, location and date(s) sampled), individual trees (including diameter, when available, and both recorded and standardised species name), species (including biological traits of each species) and the researchers who collected the data. Many types of queries are facilitated and species distribution modelling is enabled. Examining the data in BIOTREE-NET to date, we found an uneven distribution of data in space and across biomes, reflecting the general state of knowledge of the tropics. More than 90% of the data were collected since 1990 and plot size varies widely, but with most less than one hectare in size. A wide range of minimum sizes is used to define a \u27tree\u27. The database helps to identify gaps that need filling by further data collection and collation. The data can be publicly accessed through a web application at http://portal.biotreenet.com. Researchers are invited and encouraged to contribute data to BIOTREE-NET

    The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment

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    The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since July 2014. This paper describes the second data release from this phase, and the fourteenth from SDSS overall (making this, Data Release Fourteen or DR14). This release makes public data taken by SDSS-IV in its first two years of operation (July 2014-2016). Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey (eBOSS); the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data driven machine learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS website (www.sdss.org) has been updated for this release, and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020, and will be followed by SDSS-V.Comment: SDSS-IV collaboration alphabetical author data release paper. DR14 happened on 31st July 2017. 19 pages, 5 figures. Accepted by ApJS on 28th Nov 2017 (this is the "post-print" and "post-proofs" version; minor corrections only from v1, and most of errors found in proofs corrected

    Anti-Spike antibodies 3 months after SARS-CoV-2 mRNA vaccine booster dose in patients on hemodialysis: the prospective SENCOVAC study

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    Background: Patients on hemodialysis are at high-risk for complications derived from coronavirus disease 2019 (COVID-19). The present analysis evaluated the impact of a booster vaccine dose and breakthrough severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections on humoral immunity 3 months after the booster dose. Methods: This is a multicentric and prospective study assessing immunoglobulin G anti-Spike antibodies 6 and 9 months after initial SARS-CoV-2 vaccination in patients on hemodialysis that had also received a booster dose before the 6-month assessment (early booster) or between the 6- and 9-month assessments (late booster). The impact of breakthrough infections, type of vaccine, time from the booster and clinical variables were assessed. Results: A total of 711 patients [67% male, median age (range) 67 (20-89) years] were included. Of these, 545 (77%) received an early booster and the rest a late booster. At 6 months, 64 (9%) patients had negative anti-Spike antibody titers (3% of early booster and 29% of late booster patients, P =. 001). At 9 months, 91% of patients with 6-month negative response had seroconverted and there were no differences in residual prevalence of negative humoral response between early and late booster patients (0.9% vs 0.6%, P =. 693). During follow-up, 35 patients (5%) developed breakthrough SARS-CoV-2 infection. Antibody titers at 9 months were independently associated with mRNA-1273 booster (P =. 001), lower time from booster (P =. 043) and past breakthrough SARS-CoV-2 infection (P <. 001). Conclusions: In hemodialysis patients, higher titers of anti-Spike antibodies at 9 months were associated with mRNA-1273 booster, lower time from booster and past breakthrough SARS-CoV-2 infectionThe present project has been supported by Fresenius Medical Care, Diaverum, Vifor Pharma, Vircell, Fundación Renal Iñigo Álvarez de Toledo and ISCIII FEDER funds RICORS2040 (RD21/0005

    Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

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    We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratios in the near-infrared. The Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey is obtaining spatially resolved spectroscopy for thousands of nearby galaxies (median z0.03z\sim 0.03). The extended Baryon Oscillation Spectroscopic Survey (eBOSS) is mapping the galaxy, quasar, and neutral gas distributions between z0.6z\sim 0.6 and 3.5 to constrain cosmology using baryon acoustic oscillations, redshift space distortions, and the shape of the power spectrum. Within eBOSS, we are conducting two major subprograms: the SPectroscopic IDentification of eROSITA Sources (SPIDERS), investigating X-ray AGNs and galaxies in X-ray clusters, and the Time Domain Spectroscopic Survey (TDSS), obtaining spectra of variable sources. All programs use the 2.5 m Sloan Foundation Telescope at the Apache Point Observatory; observations there began in Summer 2014. APOGEE-2 also operates a second near-infrared spectrograph at the 2.5 m du Pont Telescope at Las Campanas Observatory, with observations beginning in early 2017. Observations at both facilities are scheduled to continue through 2020. In keeping with previous SDSS policy, SDSS-IV provides regularly scheduled public data releases; the first one, Data Release 13, was made available in 2016 July
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