Highly active P-doped sulfided NiMo/alumina HDS catalysts from Mo-blue by using saccharose as reducing agents precursor

Saccharose (SA) was used as organic additive in simultaneously impregnated P-doped NiMo/Al2O3 hydrodesulfurization (HDS) catalysts (Mo, Ni and P at 12, 3, and 1.6 wt%, respectively). One-pot impregnating solutions were prepared by MoO3 digestion (∼353 K) in diluted aqueous H3PO4, followed by 2NiCO3·3Ni (OH)2·4H2O addition. Saccharose (SA, SA/Ni=0.5, 1–3) was dissolved in originally emerald-green impregnating solutions which changed to cobalt blue by room-temperature aging (2–4 days, depending on SA concentration) due to Mo-blue formation by partial molybdenum species reduction. After sulfiding of samples impregnated with SA shorter MoS2 slabs of enhanced stacking were observed (by HR-TEM). Ni and Mo dispersion and nickel sulfidability (as determined by XPS) increased with the amount of organic modifier. Enhanced hydrodesulfurization activity in dibenzothiophene HDS was registered for catalyst obtained from Mo-blue precursor as to that of corresponding materials obtained from conventional emerald-green NiMoP impregnating solutions (with or without SA). However, in solids at high saccharose content (SA/Ni=3) enhanced “NiMoS” phase amount was not reflected in improved activity. Probably, excessive amount of carbonaceous deposits from SA residua decomposition during catalyst activation provoked partially plugged porous network (as determined by N2 physisorption) in sulfided formulations. That fact seemed to limit accessibility of reactant molecules to surface active sites. Mo-blue precursor obtained through monosaccharides partial reduction seemed to play decisive role in obtaining HDS catalysts of improved properties. Saccharose results a highly soluble, cheap and non-toxic environmentally-friendly additive to produce catalysts of enhanced HDS activity.The authors acknowledge support through 117086 SENERCONACYT-Hidrocarburos grant and Y.00105 Project from IMP. A.W. Gutiérrez thanks CONACYT for graduate student scholarship

Issues Year 3. Number 5. Journal of the Center for Research in Social Sciences, Education and Arts

Esta colección de Editorial UNAB presenta reflexiones sobre asuntos de actualidad dentro de la comunicación social, escritos por profesores de la Universidad Autónoma de Bucaramanga e invitados especiales a la institución, como aporte al debate sobre este campo del conocimiento, el oficio y la profesión.Presentación. - 5 Desplazamiento forzado en Colombia. Una aproximación psicosocial. - 9 ¿Porqué el tema de calidad de vida?. - 15 Fenómeno psicosocial del desempleo. - 23 El maltrato que se maltrata: Pleonasmo del maltrato infantil, una aproximación psicoanalítica. - 33 La sexualidad a partir del género. Una mirada desde el psicoanálisis. - 41 El modelo de adopción de precauciones en programas de promoción de comportamientos psicosociales. - 51 Propiedades psicométricas del cuestionario de análisis clínico (CAQ) en una muestra de estudiantes de PSicología. - 59 Henry Flórez Sóler y la escuela de Chichón. - 68This collection of Editorial UNAB presents reflections on current issues within social communication, written by professors from the Autonomous University of Bucaramanga and special guests at the institution, as a contribution to the debate on this field of knowledge, trade and profession

Construimos lazos porque estamos vivos ​o​ hay liebres en la villa

La organización con la que se articuló se ubica “Villa El Chaparral” casa popular “Carlitos Reyes” y merendero “Esperanza Popular: el Chapa en Movimiento”. La Villa “El Chaparral”, es un asentamiento urbano donde viven entre 70 y 80 familias. Es una de últimas villas céntricas que tiene la ciudad de Córdoba. Ubicada en barrio Güemes. Habitan en un contexto de sistemáticas vulneraciones de derechos  Entre el conocimiento académico y los saberes populares que los territorios expresan y construyen cotidianamente. Proceso colaborativo y transformador donde se integran y dialogan experiencias vitales de les sujetes,en una realidad social concreta,cuestionando saberes     y prácticas y articulando diversos actores políticos y sociales para pensar caminos colectivos de transformación social. Estos procesos sociales y culturales implican considerar a les sujetes como constructores y protagonistas de la realidad social en su carácter de sujetes de derechos.   Partiendo de la pregunta sobre ¿Cómo las diversas prácticas y representaciones operan en la academia a la hora de concebir los procesos de enseñanza, investigación y extensión? hemos logrado desencadenar un proceso de reflexión/acción que nos interpeló y fortaleció el trabajo conjunto entre lo académico y lo comunitario.   Pascual, Luciano. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Sajeva, Maura. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Irazusta, María Cecilia. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Domínguez, Facundo.Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Di Negro, Liliana. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Mori, Judith. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Solís, Victoria. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Lucero, Magui. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.del Val, Mariana. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Rodríguez, Miguel. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Scarpino, Pascual. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Mendizábal, Lilian. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Ojeda, Martín. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina.Mutal, Sandra. Universidad Nacional de Córdoba. Facultad de Artes. Secretaría de Extensión; Argentina

Phytostabilization of mine tailings using compost-assisted direct planting: Translating greenhouse results to the field

Standard practice in reclamation of mine tailings is the emplacement of a 15 to 90 cm soil/gravel/rock cap which is then hydro-seeded. In this study we investigate compost-assisted direct planting phytostabilization technology as an alternative to standard cap and plant practices. In phytostabilization the goal is to establish a vegetative cap using native plants that stabilize metals in the root zone with little to no shoot accumulation. The study site is a barren 62-hectare tailings pile characterized by extremely acidic pH as well as lead, arsenic, and zinc each exceeding 2000 mg kg(-1). The study objective is to evaluate whether successful greenhouse phytostabilization results are scalable to the field. In May 2010, a 0.27 ha study area was established on the Iron King Mine and Humboldt Smelter Superfund (IKMHSS) site with six irrigated treatments; tailings amended with 10, 15, or 20% (w/w) compost seeded with amix of native plants (buffalo grass, arizona fescue, quailbush, mountain mahogany, mesquite, and catclaw acacia) and controls including composted (15 and 20%) unseeded treatments and an uncomposted unseeded treatment. Canopy cover ranging from 21 to 61% developed after 41 months in the compost-amended planted treatments, a canopy cover similar to that found in the surrounding region. No plants grew on unamended tailings. Neutrophilic heterotrophic bacterial counts were 1.5 to 4 orders of magnitude higher after 41 months in planted versus unamended control plots. Shoot tissue accumulation of various metal(loids) was at or below Domestic Animal Toxicity Limits, with some plant specific exceptions in treatments receiving less compost. Parameters including % canopy cover, neutrophilic heterotrophic bacteria counts, and shoot uptake of metal(loids) are promising criteria to use in evaluating reclamation success. In summary, compost amendment and seeding, guided by preliminary greenhouse studies, allowed plant establishment and sustained growth over 4 years demonstrating feasibility for this phytostabilization technology. (C) 2016 Elsevier B.V. All rights reserved.NIEHS Superfund Research Program [2 P42 ES04940]24 month embargo; published online: 13 May 2016This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Multiculturalismo y comunicación: disertaciones teóricas y propuestas

O objetivo deste trabalho é refletir sobre as articulações no campo da comunicação e os contextos multiculturais. Estas relações representam uma área de análise que deve ser tratada, porque, de certa forma, nessas interligações são definidas formas de socialização relevantes, tais como: a construção da identidade individual e coletiva. As articulações entre multiculturalismo e comunicação envolvem processos em que o poder é um eixo transversal e é parte da estrutura dessa relação. O texto é uma proposta da comunicação com perspectiva multicultural. Entre as muitas manifestações do multiculturalismo, desenvolvemos quatro aspectos: gênero, religião, diferenças geracionais e etnia. No texto há uma posição técnica sobre o multiculturalismo, que é compreendida a partir de uma reflexão crítica e orientada para ações de fazer mundaças nas relações de dominação/subordinação de acordo como as situações, os agentes as relações e contextos historicamente construído.  The objective of this text is to reflect on the links between the communication environment and the multicultural contexts. These relations represent an analysis field that must be approached, because somehow, in those interconnections excellent forms of socialization are defined, like the building of the individual identity as much as collective. The links, between the multiculturalism and the communication, imply processes where power is a transverse axis and is a part of the structure of such relation. The tex is a proposal for a research agenda about the communication analyses with a multicultural perspective. Among the various manifestations of multiculturalism, four aspects were developed: gender, religion, generational differences and ethnicity. In the text there is a theoretical position in regard to the multiculturalism, this is understood from a critical and reflexive perspective, oriented towards actions that allow to make changes in the domination/subvordination relations according to situations, agents, relationships and specific context, built historically.El objetivo del presente trabajo es reflexionar sobre las articulaciones entre el campo de la comunicación y los contextos multiculturales. Estas relaciones representan un espacio de análisis que debe abordarse, porque de alguna manera en esas inter-conexiones se definen formas de socialización relevantes, como la construcción de la identidad tanto individual como colectiva. Las articulaciones entre la multiculturalidad y la comunicación implican procesos en donde el poder es un eje transversal y forma parte de la estructura de dicha relación. El texto es una propuesta para una agenda de investigación sobre el análisis de la comunicación con perspectiva multicultural. Entre las muchas manifestaciones de la multiculturalidad, desarrollamos cuatro aspectos: género, religión, diferencias generacionales y etnicidad. En el texto hay una posición teórica respecto al multiculturalismo, este se entiende desde un enfoque crítico, reflexivo y se orienta hacia acciones que permitan elaborar cambios en las relaciones de dominación/subordinación de acuerdo a situaciones, agentes, relaciones y contextos específicos, construidos históricamente.DOI.: 10.5841/extraprensa.v2i13.71

Planta resistente a medios con metales pesados.

Fecha de solicitud:14.03.2002 Titulares:Consejo Superior de Investigaciones Científicas (CSIC).- Universidad de Sevilla.[EN]The invention relates to a plant with a high capacity to accumulate heavy metals in the aerial part thereof and the use of same in recovering heavy metal-contaminated media. Said plants have been genetically modified to be resistant to heavy metal-contaminated media and to have the capacity, in said contaminated media, to absorb the heavy metals, said metals being accumulated in the plant leaves, in order to recover the contaminated medium. The genetic modification was based on identifying plant genes involved in the heavy metal detoxification processes and overexpressing said genes, thereby producing transformed plants that can be used in phytoremediation processes. [ES] La presente invención se refiere a una planta con una elevada capacidad de acumular metales pesados en su parte aérea y su empleo en la recuperación de medios contaminados con metales pesados. Las plantas han sido modificadas genéticamente para ser resistentes a medios contaminados por metales pesados y para en esos medios contaminados tener la capacidad de absorber los metales pesados, acumulándolos en sus hojas, para recuperar el medio contaminado.La modificación genética se ha basado en la identificación de genes de plantas implicados en los procesos de detoxificación de metales pesados y la sobreexpresión de los mismos dando lugar a plantas transformadas susceptibles de ser utilizadas en procesos de fitorremediación.Peer reviewe

Estructura y producción de Conocarpus erectus L. en el Sitio Ramsar "Manglares y Humedales de Tuxpan", Veracruz, México

Conocarpus erectus L. is rarely reported specie in Mexico and its role in the mangrove ecosystem is not understood. In order to describe its ecological role within the community, it is necessary to learn about its attributes as species. The main objective of this study was to determine the distribution patterns, structural attributes, and functions of this species in the Ramsar Site No. 1602 "Manglares y Humedales de Tuxpan". Sampling took place from September 2005 to December 2006. For each site (Laguna de Tampamachoco y Estero de Jácome) a description of the distribution pattern of the mangrove species, the structural attributes (height, diameter at breast height, and basal area), and the productivity attributes (fallen leaves, flower, and miscellaneous) for Conocarpus erectus L. was made. A one way analysis of variance was carried out to determine if there were significant differences among the structural parameters, and the production. The distribution pattern shows this species is placed far away from the mangrove forest, in areas with no influence from the tides, and at the edge of the Jacome estuary and the Tampamachoco lagoon. We found 190 individuals with an average height of 3.1m (sd. 1.35), a 8.2 cm (DBH) (sd. 5.1), and a basal area of 0.598 m2/ha. The production was composed mainly by leaves (14.82 g/ m2/month). There were significant differences among sampling sites for height, DBH, basal area and productivity. This shows the heterogeneity of this species at the Ramsar site and may have implications regarding the role this species can play whithing the mangrove community.Conocarpus erectus L., es una especie poco descrita en México y su función dentro de ecosistema de manglar, no es aún comprendida. Para conocer el rol ecológico de esta especie en la comunidad, es necesario conocer sus atributos como especie; el presente trabajo tuvo como objetivo determinar los patrones de distribución, atributos estructurales (altura, diámetro a la altura del pecho y área basal) y funcionales (producción de hojarasca, flor y misceláneos) de esta especie en el sitio Ramsar No. 1602 "Manglares y Humedales de Tuxpan". Los meses de muestreo comprendieron de septiembre 2005 a diciembre 2006. Los sitios de muestreo fueron en la Laguna de Tampamachoco y el Estero de Jácome, en Tuxpan, Veracruz; describiéndose el patrón de distribución, los atributos estructurales y los de producción de Conocarpus erectus L. Se realizó un análisis de varianza entre los parámetros estructurales, además de productividad, para conocer si existían diferencias significativas por atributo. El patrón de distribución, describe a la especie, tanto alejado del manglar, sin influencia de marea, como en las orillas del estero de Jácome y Laguna de Tampamachoco. Se cuantificaron 190 individuos con una altura promedio de 3,1 m (sd 1,35), un DAP promedio de 8,7 cm (sd. 5,1) y una área basal de 0,598 m2/ha. La producción estuvo conformada principalmente por hojas (14.82 g/m2/mes). Con relación al análisis de varianza, se encontraron diferencias significativas por sitio de muestreo tanto para altura, DAP, área basal y producción, lo que muestra la heterogeneidad de esta especie en el Sitio Ramsar y esto podría tener efectos en los distintos roles ecológicos que puede desempeñar esta especie en un manglar

Inhibition of Arabidopsis O-Acetylserine(thiol)lyase A1 by Tyrosine Nitration*

The last step of sulfur assimilation is catalyzed by O-acetylserine(thiol)lyase (OASTL) enzymes. OASTLs are encoded by a multigene family in the model plant Arabidopsis thaliana. Cytosolic OASA1 enzyme is the main source of OASTL activity and thus crucial for cysteine homeostasis. We found that nitrating conditions after exposure to peroxynitrite strongly inhibited OASTL activity. Among OASTLs, OASA1 was markedly sensitive to nitration as demonstrated by the comparative analysis of OASTL activity in nitrated crude protein extracts from wild type and different oastl mutants. Furthermore, nitration assays on purified recombinant OASA1 protein led to 90% reduction of the activity due to inhibition of the enzyme, as no degradation of the protein occurred under these conditions. The reduced activity was due to nitration of the protein because selective scavenging of peroxynitrite with epicatechin impaired OASA1 nitration and the concomitant inhibition of OASTL activity. Inhibition of OASA1 activity upon nitration correlated with the identification of a modified OASA1 protein containing 3-nitroTyr302 residue. The essential role of the Tyr302 residue for the catalytic activity was further demonstrated by the loss of OASTL activity of a Y302A-mutated version of OASA1. Inhibition caused by Tyr302 nitration on OASA1 activity seems to be due to a drastically reduced O-acetylserine substrate binding to the nitrated protein, and also to reduced stabilization of the pyridoxal-5′-phosphate cofactor through hydrogen bonds. This is the first report identifying a Tyr nitration site of a plant protein with functional effect and the first post-translational modification identified in OASA1 enzyme