Las plantas medicinales de la organización de parteras y médicos indígenas tradicionales de Ixhuatlancillo, Veracruz, México y su significancia cultural

Se registró la significancia cultural de las especies medicinales utilizadas por la Organización de Parteras y Médicos Indígenas Tradicionales "Nahuatlxihuilt" para la atención primaria de la salud, mediante el enfoque cuantitativo de la etnobotánica. Se utilizaron herramientas participativas, y se determinaron dos índices etnobotánicos: el de fidelidad de Friedman et al. (1986), que incluye el valor de uso, el rango de prioridad (ROP) y el rango de popularidad (RPL) y el índice de valor de uso de Gómez- Beloz (2002) para las partes de las plantas utilizadas. Las familias mejor representadas fueron: Compositae, Rosaceae, Lamiaceae y Solanaceae y que los géneros más importantes fueron Amaranthus, Plantago, Piper, Smilax y Urtica con dos especies cada uno. La mayor signifi cancia cultural fue: Cestrum nocturnum L., Chenopodium ambroisoides L., Chenopodium graveolens L., Urtica mexicana Liebm, U. urens Liebm y Lepidium virginicum L. (r = 0.95) (ROP = 100 y 90.9) y el índice de valor de uso para las partes de las plantas fue para las hojas (35.32) siendo las especies: Citrus sinensis (L.) Osbeck, Oncimun selloi Benth., Salvia polystachya J.G. Ortega, Psidium guajava L., Plantago lanceolata L., Plantago major L., Plantago australis L., Polygonum acuminatum Kunth, Ruta graveolens L., Sambucus nigra var. canadensis (L.) Bolli, Taraxacum offi cinale G.H. Weber ex Wigg., Tithonia tubiformis (Jacq.) Cass., Urtica chamaedryoides Pursh y los géneros Ageratina y Ageratum, las mejor representadas. De esta forma, se concluye con el análisis de la información sobre las especies propias del grupo participante y su importancia cultural lo cual fortalecen el proceso actual y dinámico de la medicina tradicional en la zona centro del estado de Veracruz

1D and 3D supramolecular structures exhibiting weak ferromagnetism in three Cu(II) complexes based on malonato and di-alkyl-2,2’-bipyridines

Abstract Manganese coordination polymers {Mn(- fum)(5dmb)(H2O)2}n (1) and {[Mn2(fum)2(4dmb)2] H2O}n (2) (fum= fumarato; 5dmb = 5,50-dimethyl-2,20-bipyridine; 4dmb = 4,40-dimethyl-2,20-bipyridine) were obtained from one-pot, solution reactions under ambient conditions. The fum ligand acquires different coordination modes in the presence of the different dmb ancillary ligands, promoting distinctive crystal structures, including divergent dimensionalities. Thus, X-ray single-crystal data reveal that complex 1 crystallizes in a monoclinic system with C2/c space group and forms an infinite one-dimensional polymer. The Mn(II) center is six-coordinated and displays a distorted octahedral configuration. In addition, the solid-state selfassembly of the polymeric structure of 1 gives rise to a twodimensional (2D) supramolecular framework, mainly through hydrogen bonding. In contrast, complex 2 crystallizes in a monoclinic system with a Cc space group and forms an infinite 2D coordination polymer having dinuclear units. The Mn(II) center has a distorted octahedral configuration. The thermal stabilities of both coordination polymers were investigated. Variable-temperature magnetic measurements show that complex 1 is paramagnetic, while complex 2 exhibits weak antiferromagnetic coupling between adjacent Mn(II) centers.supported by CONACyT project 129293, DGAPA-UNAM project IN106014, and ICYTDF, project PICCO

Microstructural Study of a Zn-Ni Alloy Prepared by Ball Milling Using Two Different Devices

Metallic zinc (Zn) has ben extensively used as protective coating of iron and steel for decades, but problems related with its high permeability has reduced its application. It was found that the corrosion resistance of zinc in form of alloys is increased by adding some transition metals. Recently, the Zn-Ni system is under research as an efficient alternative as anticorrosion coating for metals. Zn-Ni is mostly prepared by electroplating or thermal spray technologies, but there are some problems like: (i) fluctuation of Zn-Ni contents, (ii) the pollution caused by plating solutions and (iii) irregular thickness of the coating. The mechanical alloying (MA) technique can be used to fulfill the above issues because this route facilitates the synthesis of homogeneous materials from powder mixtures . Also, MA is frequently employed for the preparation of new materials based on mechanochemical reactions performed at room temperature, while avoiding the conventional ingot metallurgy [3]. This work deals with the preparation and study of a Zn-Ni alloy prepared by MA using two types of milling devices: a planetary which works manly through abrasion and impact of grinding balls and the Spex which works through the high-energy impact of balls. Zn-Ni was prepared from pure Ni and Zn powders, the equiatomic compositions were weighed and milled for 4 hours followed by sintering at 357°C during 1h

Design and test of cryogenic cold plate for thermal-vacuum testing of space components

This paper proposes a novel cryogenic fluid cold plate designed for the testing of cryogenic space components. The cold plate is able to achieve cryogenic temperature operation down to -196 °C with a low liquid nitrogen (LN2) consumption. A good tradeoff between high rigidity and low thermal conduction is achieved thanks to a hexapod configuration, which is formed by six hinge-axle-hole articulations in which each linking rod bears only axial loads. Thus, there is not any stress concentration, which reduces the diameter of rod sections and reduces the rods' thermal conduction. This novel design has a unique set of the following properties: Simple construction, low thermal conduction, high thermal inertia, lack of vibrational noise when cooling, isostatic structural behavior, high natural frequency response, adjustable position, vacuum-suitability, reliability, and non-magnetic. Additionally, the presented cold plate design is low-cost and can be easily replicated. Experimental tests showed that a temperature of at least -190 °C can be reached on the top surface of the cold plate with an LN2 consumption of 10 liters and a minimum vibration frequency of 115 Hz, which is high enough for most vibration tests of space components.The research leading to these results received funding from the Spanish Ministerio de Economía y Competitividad inside the Plan Estatal de I+D+I 2013-2016 under grant agreement n° ESP2015-72458-EXP. The authors wish to recognize the work of Alba Martínez Pérez in the preparation of figures, the work of Miguel Fernández Muñoz in 3D model preparation, and the assistance of Hector Cruz Rosco during thermal and dynamic tests. The authors especially wish to recognize the work of Jorge Serena de Olano in CNC manufacturing

Vibrios from the Norwegian marine environment: Characterization of associated antibiotic resistance and virulence genes

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SAVASA project @ TRECVID 2012: interactive surveillance event detection

In this paper we describe our participation in the interactive surveillance event detection task at TRECVid 2012. The system we developed was comprised of individual classifiers brought together behind a simple video search interface that enabled users to select relevant segments based on down~sampled animated gifs. Two types of user -- `experts' and `end users' -- performed the evaluations. Due to time constraints we focussed on three events -- ObjectPut, PersonRuns and Pointing -- and two of the five available cameras (1 and 3). Results from the interactive runs as well as discussion of the performance of the underlying retrospective classifiers are presented

Seed dormancy responses to temperature relate to Nothofagus species distribution and determine temporal patterns of germination across altitudes in Patagonia

Seeds integrate environmental cues that modulate their dormancy and germination. Although many mechanisms have been identified in laboratory experiments, their contribution to germination dynamics in existing communities and their involvement in defining species habitats remain elusive. By coupling mathematical models with ecological data we investigated the contribution of seed temperature responses to the dynamics of germination of three Nothofagus species that are sharply distributed across different altitudes in the Patagonian Andes. Seed responsiveness to temperature of the three Nothofagus species was linked to the thermal characteristics of their preferred ecological niche. In their natural distribution range, there was overlap in the timing of germination of the species, which was restricted to mid-spring. By contrast, outside their species distribution range, germination was temporally uncoupled with altitude. This phenomenon was described mathematically by the interplay between interspecific differences in seed population thermal parameters and the range in soil thermic environments across different altitudes. The observed interspecific variations in seed responsiveness to temperature and its environmental regulation, constitute a major determinant of the dynamics of Nothofagus germination across elevations. This phenomenon likely contributes to the maintenance of patterns of species abundance across altitude by placing germinated seeds in a favorable environment for plant growth.Fil: Arana, María Verónica. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gonzalez Polo, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; ArgentinaFil: Martinez Meier, Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Gallo, Leonardo Ariel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Benech-arnold, Roberto Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; ArgentinaFil: Sanchez, Rodolfo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas A la Agricultura; ArgentinaFil: Batlla, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentin

Exfoliated graphite preparation based on an eco-friendly mechanochemical route

In the present study, we proposed an eco-friendly method to produce exfoliated graphite based on a dry mechanochemical process. This route represents an alternative that avoids the use and disposal problems related to highly corrosive and dangerous reagents use, manipulation and elimination. As non-toxic alternative exfoliation route, an equimolar mixture of graphite flakes and calcium carbonate was milled and leached with an aqueous solution of acetic acid (vinegar). There was a notable reduction of the graphite particle size with a significantly increased level of exfoliation, which dramatically improved the surface area of the prepared samples from 4 to 363 m2 g-1. After 16 h of processing, milled particles reached a thickness reduction of up to 5 nm and micrometric widths.The overall yield of processed graphite is around 92% based on the raw graphite. The evident benefits of the obtained exfoliated graphites in the adsorption of methylene blue (a common pollutant of textile wastewater) are presented. Exfoliated graphite represents a valid alternative as adsorption agent for dye removal reaching efficiencies above 95% after 30 min of testing with an aqueous solution of methylene blue. Contrary, the untreated graphite sample showed a null adsorption activity

Plan estratégico de la empresa Uber

A finales de 2015, Uber se había convertido en un fenómeno global gracias a la rapidez, seguridad y eficiencia de su servicio, con más de un millón de conductores activos, y operando en más de 70 países y 330 ciudades a nivel global. La organización fue aceptada rápidamente por los usuarios y fue considerada más valiosa que dos tercios de las empresas de la lista de Fortune 500. Así mismo, fue acreditada junto a otras start ups bajo la denominación de economía de la demanda, en la que personas utilizan sus teléfonos inteligentes para conectarse a una fuerza de trabajo distribuida y activa que entrega un considerable número de servicios, desde comidas hasta servicios personales de varios tipos. Como señalamos, en poco tiempo, Uber había logrado presencia en diferentes países alrededor del mundo, razón por la cual nos enfocaremos en el fortalecimiento de su marca a través de una mejor gestión de sus relaciones con sus aliados estratégicos (stakeholders), lo que permitirá que siga liderando el mercado como una empresa de carácter global responsable socialmente, y comprometida con el bienestar de sus usuarios y socios en general. En este contexto, planteamos la implementación de estrategias de expansión, crecimiento y consolidación de la marca a nivel mundial, las cuales permitirán a Uber fortalecer su ventaja competitiva y que esta sea sostenible en el tiempo, puesto que, luego de haber realizado un análisis, sabemos que enfrenta actualmente una serie de limitaciones tanto operativas como funcionales que dificultan el acceso a nuevos mercados. Asimismo, su marca se ha deteriorado a causa de diversas acusaciones que generan una percepción de que la organización es una empresa de gran alcance solamente interesada en ingresar a cada mercado de cualquier manera y sin ningún inconveniente regulatorio que cumplir

Unveiling a Rich System of Faint Dwarf Galaxies in the Next Generation Fornax Survey

We report the discovery of 158 previously undetected dwarf galaxies in the Fornax cluster central regions using a deep coadded $u, g$ and $i$-band image obtained with the DECam wide-field camera mounted on the 4-meter Blanco telescope at the Cerro Tololo Interamerican Observatory as part of the {\it Next Generation Fornax Survey} (NGFS). The new dwarf galaxies have quasi-exponential light profiles, effective radii $0.1\!<\!r_e\!<\!2.8$ kpc and average effective surface brightness values $22.0\!<\!\mu_i\!<\!28.0$ mag arcsec$^{-2}$. We confirm the existence of ultra-diffuse galaxies (UDGs) in the Fornax core regions that resemble counterparts recently discovered in the Virgo and Coma galaxy clusters.~We also find extremely low surface brightness NGFS dwarfs, which are several magnitudes fainter than the classical UDGs. The faintest dwarf candidate in our NGFS sample has an absolute magnitude of $M_i\!=\!-8.0$\,mag. The nucleation fraction of the NGFS dwarf galaxy sample appears to decrease as a function of their total luminosity, reaching from a nucleation fraction of $>\!75\%$ at luminosities brighter than $M_i\!\simeq\!-15.0$ mag to $0\%$ at luminosities fainter than $M_i\!\simeq\!-10.0$ mag. The two-point correlation function analysis of the NGFS dwarf sample shows an excess on length scales below $\sim\!100$ kpc, pointing to the clustering of dwarf galaxies in the Fornax cluster core.Comment: 6 pages, 3 figures. Accepted for publication in The Astrophysical Journal Letters. Download the high-resolution version of the paper from the following link: https://www.dropbox.com/s/xb9vz8s29wlzjgf/ms.pdf?dl=