995 resultados para Netzel, Laura, 1839-1927


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8th President 1927-19291937-1938 (Acting President)

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Al-resistant (alr) mutants of Arabidopsis thaliana were isolated and characterized to gain a better understanding of the genetic and physiological mechanisms of Al resistance. alr mutants were identified on the basis of enhanced root growth in the presence of levels of Al that strongly inhibited root growth in wild-type seedlings. Genetic analysis of the alr mutants showed that Al resistance was semidominant, and chromosome mapping of the mutants with microsatellite and random amplified polymorphic DNA markers indicated that the mutants mapped to two sites in the Arabidopsis genome: one locus on chromosome 1 (alr-108, alr-128, alr-131, and alr-139) and another on chromosome 4 (alr-104). Al accumulation in roots of mutant seedlings was studied by staining with the fluorescent Al-indicator dye morin and quantified via inductively coupled argon plasma mass spectrometry. It was found that the alr mutants accumulated lower levels of Al in the root tips compared with wild type. The possibility that the mutants released Al-chelating organic acids was examined. The mutants that mapped together on chromosome 1 released greater amounts of citrate or malate (as well as pyruvate) compared with wild type, suggesting that Al exclusion from roots of these alr mutants results from enhanced organic acid exudation. Roots of alr-104, on the other hand, did not exhibit increased release of malate or citrate, but did alkalinize the rhizosphere to a greater extent than wild-type roots. A detailed examination of Al resistance in this mutant is described in an accompanying paper (J. Degenhardt, P.B. Larsen, S.H. Howell, L.V. Kochian [1998] Plant Physiol 117: 19–27).

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This dissertation identifies and challenges post-feminist narratives that remember the second wave or 1960s and 1970s liberal feminism as a radical form of activism. The narratives of three prominent post-feminist authors: Dr. Christina Hoff Sommers, Tammy Bruce and Dr. Laura Schlessinger are used as examples of how identification works as a rhetorical device that motivates individual actors to join in a struggle against liberal and radical feminist ideologies. I argue that each author draws on classically liberal and politically conservative virtues to define a "true" feminism that is at odds with alternative feminist commitments. I demonstrate how these authors create a subject position of a "true feminist" that is reminiscent of the classically liberal suffragist. In Burkean terms, each author constitutes the suffragist as a friend and juxtaposes her with the enemy--modern liberal and radical feminists. I articulate the consequences of such dialectical portrayals of feminist activism and further suggest that these authors' visions of feminism reinforce patriarchal practices, urging women to assimilate into a classically liberal society at the cost of social justice. In opposition to their memories of feminism, I offer a radical democratic approach of remembering feminism that is less concerned with the definition of feminism or feminist than it is with holistically addressing oppression and what oppression means to subjugated populations.

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Esta introducción al papel desempeñado por la fotografía en la ciencia hasta el año 1927, toma como punto de partida la relación que se ha establecido entre observación y conocimiento científico a lo largo de los siglos. La fotografía en la ciencia es de suma importancia no sólo por haber estado presente desde su aparición a principios del siglo XIX en la mayoría de los avances científicos modernos, sino también por haber situado la observación de los fenómenos naturales en un lugar de prevalencia en el quehacer científico y por haber sido el pilar sobre el que se ha edificado una tecnología de la imagen de suma sofisticación y ayuda a la ciencia de nuestros días. La fotografía ha demostrado de este modo su capacidad integradora y rupturista en distintas áreas de la creación humana, como medio de expresión artística, como elemento revulsivo en el devenir del arte contemporáneo, como medio de documentación y de reproducción, permitiendo el acceso de gran parte de la población a la información gráfica y a la expresión personal por medio de las cámaras, y por marcar desde su aparición un antes y un después en el devenir de la ciencia. En definitiva, esta obra confirma la fotografía como una de las piedras angulares sobre las que se ha edificado el saber científico contemporáneo, y como un elemento decisivo en la creación de una nueva cultura y una nueva dimensión del ser humano.

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"Artist Laura Anne Fry blended the concepts of professional and amateur, and helped raise the merit of ceramics in the United States. Fry influenced American art pottery with her contributions to Rookwood Pottery of Cincinnati—changing the course of the company. Her successful experiments with decorating techniques helped Rookwood become a national leader in art pottery, and eventually led to over a decade of controversy between Fry and Rookwood"

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Biografía, pensamiento y obras de Mouloud Kassem (1927-1990), político y pensador argelino a quien se puede atribuir el haber creado con sus escritos la esencia ideológica del nacionalismo de Argelia tras su independencia. Sus obras son el eje principal de la historia oficial y de la identidad de la Argelia contemporánea.

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Seven manuscript journals written by Abiel Heywood (Justice of the Peace, town clerk, and chairman of the board of selectmen, Concord, Mass.), Nathan Brooks, William Parkman, and John L. Tuttle containing criminal records, defaulted cases, and civil actions.