327 research outputs found

    The global trend in plant twining direction

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    Aim: To examine, at a global scale, patterns in the direction in which climbing plants twine. We tested three hypotheses: (1) that twining direction is determined randomly; (2) that twining direction is determined by apices following the apparent movement of the sun across the sky; and (3) that twining direction is determined by the Coriolis effect. Location: Seventeen sites spanning nine countries, both hemispheres and 65° of latitude. Methods: Twining direction was recorded for the first c. 100 stems encountered along transects through natural vegetation at each site. Results: Ninety-two per cent of the 1485 twining stems we recorded grew in right-handed helices, i.e. they twined in an anticlockwise direction. This is significantly (P < 0.001) different from random. The proportion of stems twining right-handedly (anticlockwise) was independent of both latitude (P = 0.33) and hemisphere (P = 0.63). These data are inconsistent with the idea that twining direction is determined by either the relative passage of the sun through the celestial sphere or by the Coriolis effect. Thus, we reject all three of our hypotheses. Main conclusions: The predominance of right-handed helical growth in climbing plants cannot be explained by hypotheses attempting to link plant growth behaviour and global location. One alternative hypothesis for our findings is that the widespread phenomenon of anticlockwise twining arises as a function of microtubule orientation operating at a subcellular level

    Peter Twining

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    Instinctive presence: an examination of the maternal discourse in selected works by African American and Native American women writers, 1999

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    The purpose of this study was to examine the underlying maternal motifs in selected works by African American and Native American women writers. The study, specifically focused upon African American author Toni Morrisons Beloved, and Native American author Ella Cara Delorias Waterlilv. These respective African American and Native American women, through their unwavering positions on maternal supremacy, have rightfully positioned the mother figure, whether biological, cosmic or surrogate, to the forefront. Within this formation, the bearer of life is revealed and revered as the authoritative source of spiritual growth, generational sustenance, and ancestral tribute. Both authors emphasize the significance of the maternal figure through the use of revision and (re)memory, important literary devices reflective of both cultures, to illustrate the simultaneous past, present and future. The research confirmed that the selected African American and Native American women writers strategically devised their literary language to demonstrate the prominence of this central maternal figure, and her role as maintainer of cultural traditions, thus the preserver of a society

    Exploring the educational potential of virtual worlds — Some reflections from the Schome Park Programme

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    This paper describes and reflects on the development of the Schome Park Programme (SPP), which was established with the specific aim of extending our thinking about schome, which aims to be the optimal educational system for the 21st century. In an earlier stage of the Schome Initiative, it became clear that people find it almost impossible to break free from established conceptions of education. Open virtual worlds like Second Life® virtual world offer opportunities for people to have radically different ‘lived experiences’ of educational systems and thus seemed to be the ideal vehicle for exploring alternative models of education. The SPP therefore set out in late 2006 to use Teen Second Life® virtual world to support the development of the vision of schome, informed by current understandings about learning, pedagogy and the ‘tools’ available to us today. This paper provides an overview of the first three phases of the SPP and briefly outlines the research methodologies used within it. This leads into a discussion of the potential of virtual worlds to support pedagogical exploration, which in turn leads to consideration of three dimensions of practice that emerged from the SPP. These three dimensions, which correspond closely with a framework developed in post-compulsory education, are illustrated by use of descriptions of activities and other data from the SPP. The paper concludes by raising questions about the extent to which pedagogical practices will change in the future as a result of the opportunities offered by virtual worlds
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