From the potential to the first Hochschild cohomology group of a cluster tilted algebra

The objective of this paper is to give a concrete interpretation of the dimension of the first Hochschild cohomology space of a cyclically oriented or tame cluster tilted algebra in terms of a numerical invariant arising from the potential

Producción de biomasa y comportamiento de especies forestales en cultivos energéticos

La experiencia se realizó a partir del año 2006 y se llevó a cabo hasta el año 2015 inclusive, en una propiedad rural de la Empresa Cuyoplacas S.A. en el distrito de El Pastal Departamento de Las Heras.El objetivo fue seleccionar de entre las especies y/o clones forestales de mejor comportamiento en la zona de estudio los más aptos para generar la mayor cantidad de biomasa por unidad de superficie y tiempo, en condiciones de cultivo en altas densidades y cortas rotaciones. El material vegetal utilizado fue: dos clones de Populus spp.; dos clones de Salix spp.; y Eucalyptus camaldulensis Dehnh. Las densidades de plantación fueron de 10.000 y 20.000 plantas.ha -1 .La biomasa producida por los forestales se cosechó en turnos de 2 años a partir de 2007 y hasta el 2015. Los resultados obtenidos en cuanto a la supervivencia de la especie y los clones ensayados y su comportamiento y productividad, nos permite decir que este tipo de cultivos, se presenta como una alternativa válida desde el punto de vista ambiental y técnico, para el reuso de aguas provenientes de efluentes domiciliarios.Fil: Bustamante, Juan. Universidad Nacional de Cuyo. Facultad de Ciencias AgrariasFil: López, Lucas. Universidad Nacional de Cuyo. Facultad de Ciencias Agraria

Exploring aspects of global citizenship in undergraduate students at Universidad del Norte

Exploring the potential contribution to global citizenship in an EFL learning environment may help university students, teachers, and administrators to better understand the meaning of global citizenship and identify more meaningful ways to exploit it in the language classroom as well as help other researchers to identify global citizenship topics of interest and their future applications in higher education. This paper reports a qualitative study on global citizenship education at Universidad del Norte, which aimed at exploring whether 21 undergraduate students showed aspects of global citizenship while involved in an English as a Foreign Language course based on intercultural communication. The study combined critical ethnography, document research, and qualitative content analysis. Participants kept a learning journal during the course and they answered a 15-question questionnaire at the end of the course. The data was interpreted and analyzed using qualitative content analysis in search of themes relevant to the interrelated cognitive, socioemotional, and behavioral global citizenship core dimensions. Results evidenced that knowledge, skills, values, and attitudes observed in students’ performance corresponded largely to the cognitive and socioemotional domain rather than the behavioral one and identified social connectedness and respect for diversity as the most prominent attribute among participants. Further research may be needed to explore if similar attributes can be found in other participants, provide a better understanding of the nature and development of such aspects, and assess citizenship levels more accurately.MaestríaMagister en la Enseñanza del Ingle

Representation theory of partial relation extensions

Let C be a finite dimensional algebra of global dimension at most two. A partial relation extension is any trivial extension of C by a direct summand of its relation C-C-bimodule. When C is a tilted algebra, this construction provides an intermediate class of algebras between tilted and cluster tilted algebras. The text investigates the representation theory of partial relation extensions. When C is tilted, any complete slice in the Auslander-Reiten quiver of C embeds as a local slice in the Auslander-Reiten quiver of the partial relation extension; Moreover, a systematic way of producing partial relation extensions is introduced by considering direct sum decompositions of the potential arising from a minimal system of relations of C

Behavior of Eucalyptus Sp. in Mendoza (Argentina)

Debido al interés de empresas siderúrgicas de Mendoza (Argentina) de contar con adecuada provisión de madera para sus plantas industriales, en el Instituto Forestal de la Facultad de Ciencias Agrarias (UNCuyo) se produjeron plantas de Eucalyptus. sp. provenientes de semillas australianas y locales. Dichas plantas fueron llevadas a campo para evaluar su comportamiento en condiciones de cultivo bajo riego. El ensayo se realizó en Nueva California (Dpto. de San Martín, Mendoza), a 653 msnm, en suelos arenosos, profundos, sueltos, permeables y con poca capacidad de retención de agua. Se regó por aspersión con una lámina de 70 mm cada 10 días en verano y cada 20 en invierno. Las especies y procedencias ensayadas fueron: E. camaldulensis procedencias 15022, 15028, 15195, 15799 y local; E. badjensis procedencia 17127; E. intertexta procedencias 15095 y 15886; E. grandis procedencia 12081; E. fastigata procedencia 17126; E. johnstonii procedencia 15352; E. astringens procedencia 12842; E. amygdalina procedencia 12831; E. andrewsii ssp andrewsii procedencia 13037; E. regnans procedencia 12034; E. tereticornis procedencias 13301, 13304, 13309 y local; E. benthami procedencia 17347; E. sargentii procedencia 12406; E. viminalis procedencia 12884; E. globulus ssp. bicostata; E. sideroxylon de procedencia local; E. dalrympleana procedencias 13348 y 15273: E. cinerea procedencia 25 de Mayo (Buenos Aires) y E. leucoxylon de procedencia local. Se evaluó el comportamiento al primer año, expresado por el número de fallas producidas en cada 100 plantas. Las especies más promisorias fueron: E. camaldulensis procedencia 15022, E. camaldulensis procedencia 15799, E. camaldulensis procedencia 15195, E. tereticornis procedencia 13309 y E. camaldulensis de procedencia local, con menos del 30 % de fallas. Además, anualmente se tomaron los datos dasométricos de diámetro altura pecho (DAP) y altura total de cada una de las plantas. Al cuarto año, las especies más destacadas fueron: E. camaldulensis procedencias 15022, 15195 y local, todas ellas con diámetros entre 9 y 12 cm y alturas entre 7 y 9 m.Some siderurgical companies sited in Mendoza, Argentina, showed interest in adequate wood provision as much in quality as in quantity in order to be used in their industries. For that reason, in the Forest Institute of the Faculty of Agrarian Sciences (UNCuyo), Eucalyptus sp. plants of species and origins arising from Australian and local seeds were produced. Plants obtained from germination were taken to field in order to evaluate their behavior under irrigation. The test was made in Nueva California, location of San Martín (Mendoza), at 653 m where soil is sandy, deep, loose, permeable and with little capacity of water retention. The irrigation was provided by sprinklers leaving a 70 mm water depth every 10 days in summer and every 20 days in winter. The species and origins tested were: E. camaldulensis origins 15022, 15028, 15195, 15799 and local; E. badjensis origin 17127; E. intertexta origins 15095 and 15886; E. grandis origin 12081; E. fastigata origin 17126; E. johnstonii origin 15352; E. astringens origin 12842; E. amygdalina origin 12831; E. andrewsii ssp andrewsii origin 13037; E. regnans origin 12034; E. tereticornis origins 13301, 13304, 13309 and local; E. benthami origin 17347; E. sargentii sargentii origin 12406; E. viminalis origin 12884; E. globulus ssp. bicostata; E. sideroxylon of local origin; E. dalrympleana origin 13348 and 15273; E. cinerea origin 25 de Mayo (Buenos Aires) and E. leucoxylon of local origin. Plant behavior at the first year was evaluated and it was expressed in the number of failures of each 100 plants, being the most promissory species in this aspect: E. camaldulensis origin 15022, E. camaldulensis origin 15799, E. camaldulensis origin 15195, E. tereticornis origin 13309 and E. camaldulensis of local origin, with less of 30 % of failures. In addition, it was taken annually forestry data from diameter at breast height (DBH) and total height of each plant. The most prominent species at fourth year were: E. camaldulensis origin 15022, 15195 and local origin; all of them with diameter between 9 and 12 cm and height between 7 and 9 m.Fil: Calderón, Alberto. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Departamento de Producción AgropecuariaFil: Bustamante, Juan A.. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Departamento de Producción Agropecuari

Behaviour of poplar clones in Barreal : San Juan, Argentina

Con el objetivo de estudiar el comportamiento de diferentes clones de álamos en el valle cordillerano de Barreal, ubicado en la provincia de San Juan, Argentina, en 1995 se instaló un ensayo con los siguientes clones: 7 Populus x canadensis: Cima, Fogolino, Giorgione, Schiavone, Conti 12, I-214, Veronese y 7 Populus x deltoides: Harvard, Fierolo, I-72, 67/67, 71/67, Catfish 2 y Catfish 5. El sitio se encuentra a 31°36'55'' S, 69°27'30'' W y una altura de 1.628 msnm. El suelo es aluvial, de textura franca con cantos rodados de tamaño medio a partir de los 70 cm de la superficie. El marco de plantación fue de 5 x 2,5 m y el riego superficial por surcos. Se tomaron periódicamente datos dasométricos del diámetro altura de pecho (DAP) de todos los individuos, y altura total de árboles de diámetro promedio de cada clon. Además se observó cada una de las plantas a fin de determinar la presencia o ausencia de cancrosis del álamo y taladrillo de los forestales. Los resultados a la fecha muestran que los clones con mayor producción de madera, expresada en m3/ha son: Schiavone, I-214, Veronese, Conti 12 y Giorgione.Aiming to study different poplar clones behaviour in the Andinean Valley of Barreal, placed in the province of San Juan, Argentina, in 1995 was set a trial with the following clones: 7 Populus x canadensis: Cima, Fogolino, Giorgione, Schiavone, Conti 12, I-214, Veronese, and 7 Populus x deltoides: Harvard, Fierolo, I-72, 67/67, 71/67, Catfish 2 and Catfish 5. The site is placed at 31°36'55" S and 69°27'30" W and a height of 1.628 mosl. Soil is of alluvium sediment; medium texture with middle size rolling stones, beginning at 70 cm below the surface. Plantation order was settled at 5 x 2.5 m and irrigation by surface furrows. Periodically dasometric data was taken of brest height diameter (BDH) of all individuals and total height of trees which of the average diameter on each clon. It was also observed the health development of each plant mainly to establish the presence or absence of pests and diseases like Poplar Borer and Septoria Canker. Results up to date show that higher wood production expressed in m3/ha are: Schiavone, I-214, Veronese, Conti 12 and Giorgione.Fil: Bustamante, Juan A.. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Departamento de Producción AgropecuariaFil: Perez, Silvina. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Departamento de Producción Agropecuari

Reaching for the Holy Grail: insights from infection/cure models on the prospects for vaccines for Trypanosoma cruzi infection

Prevention of Trypanosoma cruzi infection in mammals likely depends on either prevention of the invading trypomastigotes from infecting host cells or the rapid recognition and killing of the newly infected cells by T. cruzi-specific T cells. We show here that multiple rounds of infection and cure (by drug therapy) fails to protect mice from reinfection, despite the generation of potent T cell responses. This disappointing result is similar to that obtained with many other vaccine protocols used in attempts to protect animals from T. cruzi infection. We have previously shown that immune recognition of T. cruzi infection is significantly delayed both at the systemic level and at the level of the infected host cell. The systemic delay appears to be the result of a stealth infection process that fails to trigger substantial innate recognition mechanisms while the delay at the cellular level is related to the immunodominance of highly variable gene family proteins, in particular those of the trans-sialidase family. Here we discuss how these previous studies and the new findings herein impact our thoughts on the potential of prophylactic vaccination to serve a productive role in the prevention of T. cruzi infection and Chagas disease