41,062 research outputs found

    [Review of] Ramsay Burt. Alien Bodies: Representations of Modernity, Race, and Nation in Early Modern Dance

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    In Alien Bodies, Burt uses interdisciplinary methods to consider the issues of modernity and modernism in relation to the work of several makers of early modern dance. In nine chapters, he carefully examines the social constructions of nation, race, class, and gender as they were inscribed upon the dancing body. The Atlantic is the space and the period between the two great wars the time of this book\u27s focus

    Miniature carbon dioxide sensor

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    Sensor with no moving parts measures carbon dioxide partial pressures of 0 to 40 mm Hg for total pressures up to 14 psia with a full scale accuracy of 5 percent

    The role of the enzyme in the succinate-enzyme-fumarate equilibrium

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    The following is an account of an investigation into the role of the enzyme in the succinate-enzyme-fumarate equilibrium. The method consisted in the comparison of the value of the free energy change in this reaction obtained from oxidation-reduction potentials, with that calculated from the entropies and other physicochemical properties of succinic acid and fumaric acid

    Guided Wave Optics

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    Phenomena associated with the propagation and manipulation of light in thin-film dielectric waveguides are presently the object of considerable research effort, directed toward possible applications in communications and information processing. The theory of dielectric waveguide modes is reviewed, and the topics of directional coupling, input-output coupling, modulation, and distributed feedback laser sources are treated on the basis of coupled-mode theory. A summary of experimental results for each of the guided-wave optical phenomena covered by the theory is also presented

    A new species of Lomanoxia Martínez from Costa Rica (Coleoptera: Scarabaeidae: Aphodiinae)

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    A new species of Lomanoxia Martínez is described from Costa Rica: L. canthonopsis Skelley and Howden. This represents the first member of the genus reported from Central America. The status of the tribe Lomanoxini Stebnicka is evaluated and is here synonymized under Eupariini LePeletier and Serville

    Using giant scarlet runner bean embryos to uncover regulatory networks controlling suspensor gene activity.

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    One of the major unsolved issues in plant development is understanding the regulatory networks that control the differential gene activity that is required for the specification and development of the two major embryonic regions, the embryo proper and suspensor. Historically, the giant embryo of scarlet runner bean (SRB), Phaseolus coccineus, has been used as a model system to investigate the physiological events that occur early in embryogenesis-focusing on the question of what role the suspensor region plays. A major feature distinguishing SRB embryos from those of other plants is a highly enlarged suspensor containing at least 200 cells that synthesize growth regulators required for subsequent embryonic development. Recent studies have exploited the giant size of the SRB embryo to micro-dissect the embryo proper and suspensor regions in order to use genomics-based approaches to identify regulatory genes that may be involved in controlling suspensor and embryo proper differentiation, as well as the cellular processes that may be unique to each embryonic region. Here we review the current genomics resources that make SRB embryos a compelling model system for studying the early events required to program embryo development

    A model for hierarchical patterns under mechanical stresses

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    We present a model for mechanically-induced pattern formation in growing biological tissues and discuss its application to the development of leaf venation networks. Drawing an analogy with phase transitions in solids, we use a phase field method to describe the transition between two states of the tissue, e.g. the differentiation of leaf veins, and consider a layered system where mechanical stresses are generated by differential growth. We present analytical and numerical results for one-dimensional systems, showing that a combination of growth and irreversibility gives rise to hierarchical patterns. Two-dimensional simulations suggest that such a mechanism could account for the hierarchical, reticulate structure of leaf venation networks, yet point to the need for a more detailed treatment of the coupling between growth and mechanical stresses.Comment: To appear in Philosophical Magazine. 18 pages, 8 figure
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