11 research outputs found
A fossil peat deposit from the Late Triassic (Carnian) of Zimbabwe with preserved cuticle of Pteridospermopsida and Ginkgoales, and its geological setting
Well-preserved cuticular material of Pteridospermopsida and Ginkgoales from the Late Triassic of Zimbabwe is described here for the
first time. It is preserved within a brown peat-like lens in the Upper Karoo Angwa Sandstone Formation. The locality is on the Manyima
River in the lower portion of the mid-Zambezi Valley of Zimbabwe. Using SEM and light microscopy to identify the taxa, the fragmentary
cuticles are of Pteridospermopsida type and have been assigned to Lepidopteris sp. (Peltaspermales) and Dicroidium sp. A, B,
(Corystospermales). Cuticles of the ginkgoalean leaf genus, Sphenobaiera, are also described. Well-preserved ovules were found in close association with the cuticles, but as the stomata are not visible they cannot be assigned to any genus. Based on their close similarity to the Dicroidium flora of the South African Upper Karoo, the plants are considered to be equivalent to the South African Molteno Formation
in age (Carnian). The palynoflora supports this age bracket, as does fauna preserved nearby. The taphonomic process was one of
transport, sorting and deposition in a fluvial system.The CNRS-NRF agreement between France and South Afric
Writing in multi-party computer conferences and single authored assignments: Exploring the role of writer as thinker
The increasing use of computers to enable or replace face-to-face tutorial discussion groups in higher education is creating a new form of academic writing. This small-scale study of 43 students and three tutors identifies ways in which students present their opinions in a forum which allows greater time for reflection, but also creates a permanent record. The notion of collaborative learning in computer conferencing militates against taking a strong, possibly controversial, stance. Opinions are therefore hedged, or located in the peer discourse community rather than the individual. Through a corpus analysis of the use of the pronouns I, we and it we identify ways in which student writers are representing themselves and their views in both computer conferences and in single-authored essays. A powerful authorial voice was often associated not with the individual I, but with the collective we. In their single-authored essays, students drew upon the consensual voice developed in the conference discussion to support their personal points of view. In both genres, students made use of impersonal it-clauses, but frequently preceded them by personal frames such as I think, thereby resisting the impersonal, but powerful, voice of much academic discourse. This paper contributes to our developing understanding of evolving student writing practices in disciplinary settings
BHPR research: qualitative1. Complex reasoning determines patients' perception of outcome following foot surgery in rheumatoid arhtritis
Background: Foot surgery is common in patients with RA but research into surgical outcomes is limited and conceptually flawed as current outcome measures lack face validity: to date no one has asked patients what is important to them. This study aimed to determine which factors are important to patients when evaluating the success of foot surgery in RA Methods: Semi structured interviews of RA patients who had undergone foot surgery were conducted and transcribed verbatim. Thematic analysis of interviews was conducted to explore issues that were important to patients. Results: 11 RA patients (9 ♂, mean age 59, dis dur = 22yrs, mean of 3 yrs post op) with mixed experiences of foot surgery were interviewed. Patients interpreted outcome in respect to a multitude of factors, frequently positive change in one aspect contrasted with negative opinions about another. Overall, four major themes emerged. Function: Functional ability & participation in valued activities were very important to patients. Walking ability was a key concern but patients interpreted levels of activity in light of other aspects of their disease, reflecting on change in functional ability more than overall level. Positive feelings of improved mobility were often moderated by negative self perception ("I mean, I still walk like a waddling duck”). Appearance: Appearance was important to almost all patients but perhaps the most complex theme of all. Physical appearance, foot shape, and footwear were closely interlinked, yet patients saw these as distinct separate concepts. Patients need to legitimize these feelings was clear and they frequently entered into a defensive repertoire ("it's not cosmetic surgery; it's something that's more important than that, you know?”). Clinician opinion: Surgeons' post operative evaluation of the procedure was very influential. The impact of this appraisal continued to affect patients' lasting impression irrespective of how the outcome compared to their initial goals ("when he'd done it ... he said that hasn't worked as good as he'd wanted to ... but the pain has gone”). Pain: Whilst pain was important to almost all patients, it appeared to be less important than the other themes. Pain was predominately raised when it influenced other themes, such as function; many still felt the need to legitimize their foot pain in order for health professionals to take it seriously ("in the end I went to my GP because it had happened a few times and I went to an orthopaedic surgeon who was quite dismissive of it, it was like what are you complaining about”). Conclusions: Patients interpret the outcome of foot surgery using a multitude of interrelated factors, particularly functional ability, appearance and surgeons' appraisal of the procedure. While pain was often noted, this appeared less important than other factors in the overall outcome of the surgery. Future research into foot surgery should incorporate the complexity of how patients determine their outcome Disclosure statement: All authors have declared no conflicts of interes
The relationship between pollen rain, vegetation, climate, meteorological factors and land-use in the PWV, Transvaal
A two-year analysis of pollen rain was conducted in the Pretoria-Witwatersrand-Vereeniging district of the Transvaal, South Africa. Poaceae WaS the major component of the pollen assemblage, comprising 52% regionally. Of the total pollen count, 58.8% was non-seasonal and present throughout the year. During the analysis it became apparent that fungal spores dominated the atmospheric content, accounting for 94% of total airspora, considered here to incl ude pollen and fUngal spores.[Abbreviated Abstract. Open document to view full version].AC201
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Material things and expressive signs: The language of Emily Dickinson in her social and physical context
On April 15, 1862, Emily Dickinson asked Thomas Wentworth Higginson of the Atlantic Monthly to confirm her impression that her verse was alive. Both her letter, which turned on the figure of a breathing body, and her enclosed poems, which served as samples of her living artifacts, presented Dickinson as a maker of verse and a remaker of human sentience. The context out of which her sense of language arose was local networks of exchange among kin, neighbors, and friends who had some connection to Amherst. This social economy of white, middle-class women involved exchanges of living artifacts from one household to another: food, stitched items, texts, flowers. The practice of trading handmade, material things that engaged Dickinson throughout her lifetime alters the perception of her as a recluse who isolated herself from others in order to develop her genius alone. Her linguistic choices and her indirect style are derived in part, from her social practice. So are several values espoused in her poetry: goods, not cash; unique artistry, not mass production; personal interaction, not the literary marketplace. The exchange of floral gifts reflected wider cultural practices of white, middle-class women: identifying flowers and sending messages through them. These feminine conventions offered Dickinson more than a temporary blurring of science and sentiment which was corrected by Charles Darwin in 1859: they freed her from some of the sexist constructions of nature dominant in her time. Her floral imagery resists the teeth and claws of Darwinian survival and the classifications of botanists. Science and religion emerge in her poetry as authorities proferring instructive utterances that require misreading. Her grounds for misreading include her experience with the Amherst landscape and her own body. Her various strands of earth, garden, and body imagery demonstrate how central the speaking body was to her art. By ignoring literature about diseased women\u27s bodies and constructing gardens as primarily positive space, Dickinson found the means to let her body speak. Although speaking physical, sexual, and poetic fulness was difficult for Dickinson, she made verses that expressed the body\u27s potential and touched others with their breath
Organization and Evolution of a Gene-Rich Region of the Mouse Genome: A 12.7-Mb Region Deleted in the Del(13)Svea36H Mouse
Del(13)Svea36H (Del36H) is a deletion of ∼20% of mouse chromosome 13 showing conserved synteny with human chromosome 6p22.1-6p22.3/6p25. The human region is lost in some deletion syndromes and is the site of several disease loci. Heterozygous Del36H mice show numerous phenotypes and may model aspects of human genetic disease. We describe 12.7 Mb of finished, annotated sequence from Del36H. Del36H has a higher gene density than the draft mouse genome, reflecting high local densities of three gene families (vomeronasal receptors, serpins, and prolactins) which are greatly expanded relative to human. Transposable elements are concentrated near these gene families. We therefore suggest that their neighborhoods are gene factories, regions of frequent recombination in which gene duplication is more frequent. The gene families show different proportions of pseudogenes, likely reflecting different strengths of purifying selection and/or gene conversion. They are also associated with relatively low simple sequence concentrations, which vary across the region with a periodicity of ∼5 Mb. Del36H contains numerous evolutionarily conserved regions (ECRs). Many lie in noncoding regions, are detectable in species as distant as Ciona intestinalis, and therefore are candidate regulatory sequences. This analysis will facilitate functional genomic analysis of Del36H and provides insights into mouse genome evolution
The Impact of Medical Comorbidity on Mental Health and Functional Health Outcomes Among Children with Anxiety Disorders
Home and Community Occupational Therapy for Children and Youth: A before and after Study
Short-Termism and Long-Termism
A significant debate in corporate law and finance concerns the role of activist investors (especially hedge funds) in corporate governance. Activists, it is often alleged, imprudently privilege short term earnings over superior (but less liquid) long term investments. Activists counter that they target managers who unjustifiably cling to questionable strategies. While this debate is hardly new, it has grown increasingly fractious of late. We analyze the activism debate within a theoretical securities-market setting. In our framework – which draws from an emerging literature in empirical and experimental finance – managers are differentially overconfident (causing them to favor long-term projects), while investors are differentially present-biased (causing them to favor short-term liquidity). We allow these biases to be either fundamental or induced by institutional factors, and they can occur either in isolation or in conjunction. Equilibrium behavior bears an uncanny resemblance to the ongoing activism debate, providing a new perspective on well-worn battle lines. Prescriptively, we demonstrate that short-termism and long-termism can have symbiotic attributes. Consequently, an optimal corporate law and governance regime should account for both effects, as well their possible interaction