Guayule plants were screened in the region of Mapimi (Durango, Mexico) to evaluate physicochemical parameters for selection of increased productivity. The objective was to characterize rubber, and resin content, stem diameter, rubber molecular weight and cytology of these plants to identify and select high productivity sites. Samples were collected from nine locations within the Mapimi Region. Inflorescences containing young floral buds of the same plants were selected to determine ploidy level. Cytogenetic results showed the presence of di‐, tri‐ and tetraploids. Samples for rubber and resin analysis were cut from the branches. Genetic variation in molecular weight and molecular weight distributions for rubber was measured. Significant differences were found in resin content and stem diameter between the sampling sites, but differences were not significant for the rubber content between sites. A productivity parameter was defined and used to identify two locations where guayule genotypes exhibited the best characteristics for commercialization. This information may increase the industrial development and understanding of the polymerization bioprocess.
We propose an alternative method to generate an artificial reference source for a Ground Layer Adaptive Optics system airborne on a Multirotor Unmanned Aerial Vehicle. Turbulence profiles from the Ground Layer at the National Astronomical Observatory in San Pedro Martir were analyzed to establish the requirements in luminosity, altitude, and flight stability of an artificial source. We found the source must be at least 800 m above the observatory's surface and follow a fixed trajectory to emulate the apparent movement of the stars with a stability of 1.54 cm in time intervals smaller than 18 ms. We establish some commercial and customized MUAVs can nearly accomplish this task.
El 11 de octubre de 1947 Lewis Mumford dedicaba su columna “The Sky Line” de ‘The New Yorker’ a la arquitectura regionalista del reciente Estilo de la Bahía de California. Mumford aprovechaba la exposición de sus ideas para expresar su recelo respecto a la acogida de la arquitectura europea del Estilo Internacional en los Estados Unidos. Dicho artículo desencadenó un simposio en el MoMA de Nueva York al que acudió la plana mayor de la arquitectura: Gropius, Breuer, Saarinen, Chermayeff, Nowicki, Hitchcock, Johnson, Barr, Scully, Blake… y el propio Mumford. El título resultaba ambicioso: “¿Qué le está pasando a la arquitectura moderna?”. Si bien los ponentes no lograron ponerse de acuerdo, sus intervenciones aclararon cuestiones que muchos pensaban pero pocos se atrevían a decir: la arquitectura moderna no convencía a la sociedad y se convertía en un producto exclusivo para arquitectos. Años después, dichas posiciones serían determinantes para Robert Venturi.
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