18,243 research outputs found
Enzymatic functions and mycoparasitism vs sclerotia in Trichoderma
No full textThe mycoparasitic activity of Trichoderma spp. against sclerotial phytopathogenic fungi is a powerful tool for a biocontrol agent, since these highly resistant vegetative structures represent the pathogen primary survival form in soil.
Parasitic interactions established by Trichoderma against sclerotial fungi have been mainly investigated by histological and biochemical analysis. Several enzymatic activities have been related to sclerotia mycoparasitism, such as enzymes degrading cell wall components (chitinase, cellulase) or phenolic compounds (laccase, lignin and melanin degrading enzymes), protease and lipase.
The availability of a T. virens isolate (I10) transformed with genes coding for fluorescent proteins, red (I10DsRed) and green (I10GFP), allowed to monitor Trichoderma as antagonist in natural environments (1) and to follow in vitro sclerotia colonisation of Sclerotium rolfsii and Sclerotinia sclerotiorum (2).
The present work aims to identify enzymatic activities related to the mycoparasitic ability by a genetic approach. Mutants of I10DsRed and I10GFP were selected for specific functions in order to evaluate their sclerotia colonisation ability. S. sclerotiorum and Botrytis cinerea were used as phytopathogenic sclerotia producing fungi. Mutants were screened for cellulases, chitinases, lipases, proteases and laccases activities; the correlation between defective traits and sclerotia colonisation is under investigation.
REFERENCES
1. Mikkelsen L, Sarrocco S, Lübeck M and Jensen DF. FEMS Microbiology Letters 223: 135-139 (2003).
2. Sarrocco S, Mikkelsen L, Vergara M, Jensen DFM, Lübeck M and Vannacci G. Mycological Research 110: 179-187 (2006)
Extended Finite Elements method for fluid-structure interaction with an immersed thick non-linear structure
No full textLos lugares de una megaciudad, una introducción. Antropología. Boletín Oficial del Instituto Nacional de Antropología e Historia: Espacios de la Ciudad de México. Num. 75-76 Nueva Época (2004) julio-diciembre
No full textGamboa, Federico, Reconquista, 2ª ed., México, Botas, 1937, pp. 276–277.Hannerz, Ulf; Exploración de la ciudad, México, FCE, 1986.Vergara, Abilio, Amparo Sevilla y Miguel Ángel Aguilar (coords.), La ciudad desde sus lugares. Trece ventanas etnográficas para una metrópoli, México, UAM-I/Porrúa/Culturas Populares, 2001.Vergara, Abilio; “El lugar antropológico. Una introducción”, en Miguel Ángel Aguilar, Amparo Sevilla, Abilio Vergara (coords.), op. cit., 2001, p. 10
Episodio 3: sin miedos: Ariela Vergara-Jaque
No full textAriela Vergara-Jaque es una investigadora joven del Instituto Milenio MiNICAD, profesora adjunta de la Universidad de Talca. Galardonada por premios de "Women in Science", y participó en el primer Congreso de mujer en Bioinformática y Data science en Latinoamérica en 2020. Este episodio tiene una duración de 20 minutos. Para escucharlo solo debes cliquear en enlace que aparece más abajo a Spotify
Robin-Robin preconditioned Krylov methods for fluid-structure interaction problems
No full textIn this work, we propose a Robin–Robin preconditioner combined with Krylov iterations for the solution of the interface system arising in fluid–structure interaction (FSI) problems. It can be seen as a partitioned FSI procedure and in this respect it generalizes the ideas introduced in [S. Badia, F. Nobile, C. Vergara, J. Comput. Phys. 227 (2008) 7027–7051]. We analyze the convergence of GMRES iterations with the Robin–Robin preconditioner on a model problem and compare its efficiency with some existing algorithms. The method is shown to be very efficient for many challenging fluid–structure interaction problems, such as those characterized by a large added-mass effect or by enclosed fluids. In particular, the possibility to solve balloon-type problems without any special treatment makes this algorithm very appealing compared to the computationally intensive existing approache
Sobre a formação e o acesso a acervos de arte contemporânea: o caso do Ateliê Carlos Vergara
No full textThe institutionalization of artists’ private estates isn’t a recent phenomenon, but this is a process that has been accelerated in the last 30 years. The social transformations brought by the result of the establishment of a global economic order have created new rules in the universe of cultural organizations. This work is the result of a research on institutions that administrate contemporary artists´ estates. The idea was to establish the basis for the constitution of a simila institution – the Ateliê Carlos Vergara. The theme was explored on the basis of interviews with five Brazilian artists and of an analysis of Carlos Vergara´s career and studio. Some issues related to the organization and preservation of the works, to the sustainability of the institutions and to the role of the heirs in the administration of the organizations, as well as the coherence of these initiatives with the principles of the artists are discussed in this text.A institucionalização de acervos particulares de artistas não é um fenômeno recente, mas esse processo se acelerou nos últimos 30 anos. As transformações sociais decorrentes do estabelecimento de uma ordem econômica globalizada criaram novas regras no universo das organizações culturais. Este trabalho é o resultado de uma pesquisa sobre instituições responsáveis por gerir acervos de artistas contemporâneos realizada com o objetivo de encontrar diretrizes para a constituição de uma iniciativa da mesma ordem: o Ateliê Carlos Vergara. O tema foi examinado com base em entrevistas com cinco artistas plásticos brasileiros e em um levantamento sobre a trajetória de Carlos Vergara e de seu ateliê. Algumas questões relacionadas à organização e à preservação dos acervos, à sustentabilidade das instituições, ao papel dos herdeiros em sua gestão, assim como ao alinhamento dessas iniciativas aos princípios dos artistas, são discutidas neste texto
An approximate method for solving incompressible Navier-Stokes problem with flow rate conditions
No full textWe consider the incompressible Navier–Stokes problem with flow rate boundary conditions. This problem has been investigated in [J. Heywood, R. Rannacher, S. Turek, Artificial boundaries and flux and pressure conditions for the incompressible Navier–Stokes equations, Int. J. Numer. Methods Fluids 22 (1996) 325–352; L. Formaggia, J. F. Gerbeau, F. Nobile, A. Quarteroni, Numerical treatment of defective boundary conditions for the Navier–Stokes equation, SIAM J. Numer. Anal. 40(1) (2002) 376–401; A. Veneziani, C. Vergara, Flow rate defective boundary conditions in haemodynamics simulations, Int. J. Numer. Methods Fluids 47 (2005) 803–816]. In the latter two papers, a feasible numerical formulation of this problem, based on a Lagrange multiplier approach has been investigated. This approach has the drawback of high computational costs. In this paper, we propose an approximate formulation of this problem, yielding a strong reduction of the computational costs. The error analysis shows that the error introduced by this approximate formulation is confined in a small region of the boundary. This is confirmed by the numerical simulations
Suplemento 34. Antropología del espacio público: La plaza. 78 (2005) julio. Diario de Campo. Boletín Interno de los investigadores del área de Antropología
No full text- Introducción por Abilio Vergara Figueroa. - La plaza pública por Abilio Vergara Figuero. - Plaza, mercado y tianguis por Ana Lidia Domíngue. - Plaza de Armas, Grande o Principal de Mérida, Yucatán: historia, características, usos y usuarios por José Humberto Fuentes Gómez. - La configuración de espacios en la Plaza Mayor “José Antonio de Sucre” de Huamanga por Claudio Rojas. – El Zócalo de la ciudad de Puebla como espacio público de protesta social por Ernesto Licona Valencia y Betsabe Martínez Manzanero. - Tlalpan, ecos e imágenes de una plaza por Vicente Guzmán Ríos. - La plaza de Iztacalco, emblema de los siete barrios por Yamel Gutiérrez Vega. - El parque Naucalli: espacio y sus significados por Sergio Alberto Franco Mondragón
Título: Discursos genealogicos de la nobilissima familia Ruiz de Vergara y continuacion de sus sucessiones en la casa de los señores de Villoria
No full textPie de imprenta tomado de colofónPie de imp. tomado de colofónSign.: [ ]\p1\s, ¶-2¶\p2\s, 3¶\p1\s, A-Z\p6\s, 2A-2N\p6\s, 2O\p4\s, a-h\p6\s, i\p2\sSegundo titulo tomado de la dedicatoria, en página 1 segunda secuencia, con paginación propiaTexto con apostillas marginales y reclamosSign.: [ ]\p1\s, [calderón]-2[calderón]\p2\s, 3[calderón]\p1\s, A-Z\p6\s, 2A-2N\p6\s, 2O\p4\s, a-h\p6\s, i\p2\sSegundo tit. tomado de la dedicatoria, en p. 1 segunda secuencia, con pag. propiaPortada con grabado calcográfico arquitectónico: "Pedro de Villafranca, sculptor Regius, ft."Las hojas de grabado calcográfico: "Petrus de Villafranca sculptor Regius fact. Matriti 1661" el retrato de Felipe IV, y "Petrus de Villafranca sculptor Regius ft." el retrato del biografiadoEscudo grabado calcográfico de la familia Ruiz de Vergara en página 20 de la segunda secuenciaCabeceras, viñetas y letras capitales xilográficasPort. grab. calc.: "Pedro de Villafranca, sculptor Regius, ft."Las h. de grab. calc.: "Petrus de Villafranca sculptor Regius fact. Matriti 1661" el retrato de Felipe IV, y "Petrus de Villafranca sculptor Regius ft." el retrato del biografiadoEsc. grab. calc. de la familia Ruiz de Vergara en p. 20 de la segunda secuenciaDiscursos genealógicos de la nobilísima familia de Ruiz de Vergar
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