Control de papas guachas con herbicidas hormonales

Las plantas de papas espontáneas, originadas de tubérculos remanentes luego de la cosecha de un cultivo de papa semilla, representan un serio problema al convertirse en una maleza perenne de difícil control. Esto se debe a que contaminan el lote con tubérculos de distintas variedades que constituyen una fuente potencial de inóculo de diversos patógenos como Phytophthora infestans y Ralstonia salanacearum, virus Y (PVY) y del enrollado de la hoja (PLRV), y nemátodes como Meloidogyne sp. y Nacobus aberrans.EEA BalcarceFil: Noya, Ariel. Actividad privada.Fil: Panaggio, Néstor Hernán. Instituto Nacional de Tecnología Agropecuaria. (INTA). Estación Experimental Agropecuaria Balcarce; Argentina.Fil: Panaggio, Néstor Hernán. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina.Fil: Bedmar, Francisco. Instituto Nacional de Tecnología Agropecuaria. (INTA). Estación Experimental Agropecuaria Balcarce; Argentina.Fil: Bedmar, Francisco. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina.Fil: Capezio, Silvia. Instituto Nacional de Tecnología Agropecuaria. (INTA). Estación Experimental Agropecuaria Balcarce; Argentina.Fil: Capezio, Silvia. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina

Structural characterization of systems with competing interactions confined in narrow spherical shells

15 pags., 9 figs.Systems with short-range attraction and long-range repulsion can form ordered microphases in bulk and under confinement. In fact, confinement has been proven to be a good strategy to induce the formation of novel ordered microphases that might be appealing to the development of functional nanomaterials. Using Grand Canonical Monte Carlo (GCMC) simulations, we study a model colloidal system with competing interactions under confinement in narrow spherical shells at thermodynamic conditions under which the hexagonal phase is stable in bulk. We observe the formation of three parent ordered structures formed by toroidal clusters and two spherical clusters (Type I), toroidal clusters and one spherical cluster (Type II), and toroidal clusters alone (Type III), depending on the radius of the confining shell, that can often coexist with other related structures derived from these parent ones by a simple transformation, in which the system is divided into two hemispheres that are rotated with respect to each other by a given angle. We propose a general method to characterize and predict the structures obtained under confinement in spherical shells in systems able to self-assemble into a hexagonal phase in bulk. We also show that deforming the spherical shells into ellipsoidal ones affects the structure of the system in such a way that helical structures are favoured by prolate ellipsoids and toroidal structures by oblate ellipsoids.We would like to acknowledge the support from NCN grant No 2018/30/Q/ST3/00434 and from the Agencia Estatal de Investigacion and the Fondo Europeo de Desarrollo Regional (FEDER), Grant No PID2020-115722GB-C21.Peer reviewe

Self-Assembly of Optimally Packed Cylindrical Clusters inside Spherical Shells

7 pags., 4 figs.Systems with short-range attraction and long-range repulsion can form ordered microphases in bulk and under confinement. Using grand canonical Monte Carlo simulations, we study a colloidal system with competing interactions under confinement in narrow spherical shells at thermodynamic conditions at which the hexagonal phase of cylindrical clusters is stable in bulk. We observe spontaneous formation of different ordered structures. The results of the simulations are in a very good agreement with the predictions of a simple mathematical model based on the geometry and optimal packing of colloidal clusters. The results of the simulations and the explanation provided by a relatively simple geometric model may be helpful in manufacturing copolymer nanocapsules and may indicate possible ways of coiling DNA strands on spherical objects.We would like to acknowledge the support from NCN (grant no 2018/30/Q/ST3/00434) and from the Agencia Estatal de Investigación and the Fondo Europeo de Desarrollo Regional (grant no PID2020-115722GB-C21). This project has received funding from the European Union Horizon 2020 research and innovation under the Marie Skłodowska-Curie grant agreement no. 734276 (CONIN). Additional funding was received from the Polish Ministry of Science and Higher Education for the implementation of the project no. 734276 in the years 2017−2022.Peer reviewe