Incremento de la patogenicidad de hongos en arroz bajo condiciones de desbalance nutricional

This article discusses the potential plant pathogenic fungi that affect rice grown in imbalance nutritional conditions. Rice, Oryza sativa, is the main staple food across countries of the world. The genus Rhizoctonia, Pyricularia, Alternaria, Fusarium y Curvularia have been shown as the potential pathogenic fungi which cause significant damage to shoot, stems, panicle base and rice grains. The incidence and severity of these pathogens are main affected by temperatures between 25 and 37°C, relative humidity (70-76%), soil moisture, wind, and nutritional imbalance. The genus Rhizoctonia causes brown elliptical spots, rotting of stems and panicles, which reduces yields by 19%. On the other hand, fungi within the genera Alternaria, Fusarium, Curvularia and Pyricularia cause brown spots and decrease germination, yield, specific grain weight (g L-1). Although there is research on fungi affecting rice cultivation, the association between nutritional imbalance and pathogen incidence has yet to be evaluated in germplasm of more than 100 rice cultivars under well-fed and nutritional imbalance conditions.El presente artículo discute los hongos fitopatógenos potenciales que afectan al cultivo de arroz en condiciones de desbalance nutricional. A nivel mundial el arroz es considerado como el tercer cultivo alimentario de mayor importancia. Sin embargo, es afectado por diversos hongos fitopatógenos que ocasionan daños en hojas, tallos, panículas y granos del cultivo. La incidencia de estos hongos se debe a factores como la temperatura (25-37 ºC), humedad relativa (70-76%), humedad en el suelo, el viento y desbalance nutricional. El género Rhizoctonia causa manchas con forma elíptica de coloración marrón, pudrición de tallos y panículas, lo que reduce el 19% del rendimiento. Por otra parte, los hongos que se encuentran dentro de los géneros Alternaria, Fusarium, Curvularia y Pyricularia provocan manchas de color café y disminuyen la germinación, rendimiento, peso específico del grano (g L-1). Aunque existen investigaciones acerca de los hongos que afectan al cultivo del arroz, la asociación entre el desbalance nutricional y la incidencia de patógenos aún está por evaluarse en germoplasmas superiores a 100 variedades de arroz en condiciones óptimas y de desbalance nutricional

Características y matices del cinismo reflejados en las obras “El desencanto” de Jacinta Escudos y “Los héroes tienen sueño” de Rafael Menjívar Ochoa

La investigación se realizó con el objetivo de comprobar la influencia de la estética del cinismo en las producciones literarias salvadoreña de postguerra. Para este objetivo se retomaron las obras "El desencanto" de Jacinta Escudos y "Los héroes tienen sueños" de Rafael Menjívar Ochoa, a las cuales se les practicó un análisis por medio del cual se determinó la presencia de varias características y matices de la estética del cinismo expuestas en el libro "Estética del cinismo: pasión y desencanto de la literatura Centroamericana de postguerra" de la autora salvadoreña Beatriz Cortés, el cuál ha sido retomado cómo principal corpus teórico de la investigación, entre estas características encontradas están la pasión, los espacios urbanos, el fin de la estirpe y la autodestrucción. Además de estas características mencionadas en el libro de Beatriz Cortés, se encontraron otras que están patentes en las obras estudiadas, tales como la soledad, el anonimato y el resquebrajamiento psicológico de los sujetos. Además del estudio de las características del cinismo, se les practicó a las obras un análisis desde la perspectiva del monomito, propuesto por Joseph Campbell en su libro "El héroe de las mil caras", la cual es una forma de análisis totalmente novedosa para este tipo de obras. También se encontró la presencia de la influencia de la corriente postmoderna en las obras estudiadas, en aspectos tales como la presencia la aparición de personajes completamente novedosos en comparación a los cánones presentados en la literatura salvadoreña hasta ese momento, ya que las obras estudiadas nos presentan personajes atormentados y no heroicos, así como la introducción de temas tabús para la época

Cómo incide una propuesta de desarrollo humano en el manejo de la convivencia escolar, en estudiantes de los grados seis (6°) y siete (7°) de la institución educativa general Santander de la ciudad de montería (Cordoba)

El presente proyecto de investigación busca presentar cómo incide una propuesta de desarrollo humano en el manejo de la convivencia escolar, en estudiantes de los grados seis (6°) y siete (7°)de la Institución Educativa General Santander de la ciudad de Montería, los cuales muestran faltas de interés y responsabilidad con sus compromisos escolares, situaciones de intolerancia e indisciplina, frecuentes infracciones de las normas del manual de convivencia de la institución educativa y un ambiente de intolerancia que afecta la convivencia, deteriora las buenas relaciones y la comunicación entre los miembros de la comunidad educativa

A hybrid gateway discovery algorithm for supporting QoS communications in heterogeneous networks

[EN] In most practical applications, ad hoc mobile devices demand the access to wired hosts located beyond the limits of the mobile ad hoc network, forming a heterogeneous wired-cum-wireless network. This interconnection requires a network device known as gateway. The gateway functions as a bridge between the ad hoc environment and infrastructure-based networks, as Internet. We propose in this paper an algorithm for the discovery and selection of gateways and its integration in a routing protocol for mobile ad hoc networks. Our proposed algorithm is based on an adaptive hybrid strategy where the proactive and reactive methods are combined. Consequently, gateways maintain routing information sending advertisement messages to mobile nodes inside a limited range (proactive area). Those nodes located outside that area must execute a reactive gateway discovery process. The size of the proactive area and the frequency of the control messages are dynamically adapted. The simulation results show that our approach achieves better results in terms of packet loss and delay without increasing the routing overhead.Castellanos Hernández, WE.; Guerri Cebollada, JC.; Chacon Osorio, ME. (2016). A hybrid gateway discovery algorithm for supporting QoS communications in heterogeneous networks. Revista Facultad de Ingenieria Universidad de Antioquia. 78:80-88. doi:10.17533/udea.redin.n78a1180887

The Role of Lipopeptidophosphoglycan in the Immune Response to Entamoeba histolytica

The sensing of Pathogen Associated Molecular Patterns (PAMPs) by innate immune receptors, such as Toll-like receptors (TLRs), is the first step in the inflammatory response to pathogens. Entamoeba histolytica, the etiological agent of amebiasis, has a surface molecule with the characteristics of a PAMP. This molecule, which was termed lipopeptidophosphoglycan (LPPG), is recognized through TLR2 and TLR4 and leads to the release of cytokines from human monocytes, macrophages, and dendritic cells; LPPG-activated dendritic cells have increased expression of costimulatory molecules. LPPG activates NKT cells in a CD1d-dependent manner, and this interaction limits amebic liver abscess development. LPPG also induces antibody production, and anti-LPPG antibodies prevent disease development in animal models of amebiasis. Because LPPG is recognized by both the innate and the adaptive immune system (it is a “Pamptigen”), it may be a good candidate to develop a vaccine against E. histolytica infection and an effective adjuvant

Breastfeeding and Premature Newborn in the NICU

Today it is well known that the best gift that a mother can give her baby is breast milk. And what happens with all those children who for some reason are born premature, who cannot start breastfeeding either because of their severity, because they are separated from their breasts or simply because of their severity. For many years, the World Health Organization recommends exclusive human milk during the first 6 months of life, however, the premature newborn sent to the neonatal intensive care unit experiences a series of unfortunate events before starting enteral feeding many of them. They die during their stay. However, at the moment the importance has been given to the beginning of human milk from its mother or from a milk bank, and of the care around the family that the critically ill newborn must have. Unfortunately, Mexico and Latin America continue to have some areas with many lags in terms of nutrition and care of the newborn in the NICU. The success of breastfeeding with a baby in the NICU depends on the information and training provided to the mother about the expression, storage and transport of her milk. That the whole family be made aware that an essential part in the recovery of premature infants is to provide breast milk in a timely manner

Biocontrol of Fusarium oxysporum by Trichoderma spp. in Aloe vera under greenhouse and field conditions

 During the last decade, an increase in the incidence of the fungus Fusarium oxysporum in aloe [Aloe vera (L.) Burm.f.] plants has been observed, reducing the national production by 14%. A study was conducted to evaluate five native strains of Trichoderma against F. oxysporum in A. vera plants, under greenhouse and field conditions. The experiment in the greenhouse consisted of evaluating 1-year-old A. vera plants, which were inoculated in the root with a suspension of 10 mL of 1×108 conidia of Trichoderma spp. This experiment consisted of six treatments with ten repetitions; five strains of Trichoderma spp. and the control (without chemical treatment). The evaluation in field was conducted for one year (2016-17) to test five strains of Trichoderma spp. and the control (without chemical treatment), under a randomized complete block design with five replications. The evaluation under greenhouse conditions showed that when A. vera plants were treated with Trichoderma asperellum, the lowest incidence (5%) of F. oxysporum was observed and plants had the highest number of leaves than the rest of the treatments with 0.9% of total solids. Under greenhouse conditions, plants inoculated with Trichoderma asperellum and T. harzianum reduced the incidence of F. oxysporum by 30% and 40%, respectively. In the field, when evaluating T. asperellum, a lower incidence (9%) of F. oxysporum was observed in A. vera plants, and the leaves showed 0.9% of total solids. The plants inoculated with T. asperellum and T. harzianum decreased the incidence of the phytopathogen by 40% and 50%, respectively.  In addition, an increase was observed in plant height, number of leaves, total solids, weight of root and leaves of A. vera with different Trichoderma species both under greenhouse and field conditions.&nbsp

Charge density wave in layered La1-xCexSb2

The layered rare-earth diantimonides RSb2 are anisotropic metals with generally low electronic densities whose properties can be modified by substituting the rare earth. LaSb2 is a nonmagnetic metal with a low residual resistivity presenting a low-temperature magnetoresistance that does not saturate with the magnetic field. It has been proposed that the latter can be associated to a charge density wave (CDW), but no CDW has yet been found. Here we find a kink in the resistivity above room temperature in LaSb2 (at 355 K) and show that the kink becomes much more pronounced with substitution of La by Ce along the La1-xCexSb2 series. We find signatures of a CDW in x-ray scattering, specific heat, and scanning tunneling microscopy (STM) experiments in particular for x≈0.5. We observe a distortion of rare-earth-Sb bonds lying in-plane of the tetragonal crystal using x-ray scattering, an anomaly in the specific heat at the same temperature as the kink in resistivity and charge modulations in STM. We conclude that LaSb2 has a CDW which is stabilized in the La1-xCexSb2 series due to substitutional disorder.E.H. acknowledges the support of Departamento Administrativo de Ciencia, Tecnología e Innovación, COL-CIENCIAS (Colombia) Programa Doctorados en el Exterior Convocatoria 568-2012. This work was supported by the Spanish MINECO (FIS2014-54498-R, MAT2011-27470-C02-02, and CSD-2009-00013), by the European Union (Graphene Flagship Contract No. CNECT-ICT-604391 and COST MP1201 action), and by the Comunidad de Madrid through programs Nanofrontmag-CM (S2013/MIT-2850) and MAD2D-CM (S2013/MIT-3007). We acknowledge MINECO and CSIC for financial support and for provision of synchrotron radiation facilities and would like to thank the SpLine BM25 staff for assistance in using the beamline

Celulosa : un polímero de siempre con mucho futuro

RESUMEN: Dentro de la gran cantidad de sustancias naturales que han sido de un valor significativo a lo largo de todo el desarrollo científico – tecnológico de la humanidad se destaca sin lugar a dudas la celulosa, considerada como uno de los polímeros naturales de mayor abundancia en la naturaleza, y que puede ser obtenida desde las más variadas fuentes entre las que se encuentran: todo tipo de cuerpos vegetales, en diferentes tipos de algas, de la actividad extracelular de múltiples tipos de microorganismos y en el caparazón o estructura de algunos animales marinos (Zuluaga, 2014)

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

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