Archaeology and texts

Christ's Colleg

An enterprise map of Ghana

Ghana’s economy has grown rapidly over the past decade, and the goal of becoming a middle-income country in the fairly near future now seems attainable. The likely contribution of the oil sector makes the goal look all the more achievable. Yet this goal is unlikely to be attained without a substantial advance in Ghana’s industrial capability. This is therefore a good moment to ask some questions. • What are the current capabilities of Ghanaian firms? • Where did those capabilities come from? • Can the development of the oil sector lead to a parallel advance in related local industries? This volume presents the first general overview of Ghana’s industrial sector. Each industry is profiled in detail, and the history and capabilities of leading firms are explored at length

Manufacturing processes

The following issues are covered: process development frequently lags behind material development, high fabrication costs, flex joints (bellows) - a continuing program, SRM fabrication-induced defects, and in-space assembly will require simplified design

The regulation of root development by aluminium in Zea mays L.

Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1986.This investigation confirmed that plant reaction to Al was directed through the disruption of intercellular co-ordination existing between the cell populations comprising the root meristem. The first detectable response to A1 in the root involved disruption of Golgi apparatus function in the cap periphery. Ultrastructural changes in the cap periphery coincided with the presence of A1 in these cells. Conspicuous physiological changes involving cell enlargement, cell metabolism and root elongation were identified in cells initially remote from the site(s) of A1 uptake. Communication between A1-damaged peripheral root cap cells and the cell populations of the cap and proximal meristems, quiescent centre and region of cell growth was therefore indicated. A decrease in amyloplast numbers in response to increasing AI concentration coincided with diminished Golgi apparatus activity in the peripheral cap. These changes preceded detectable reductions in mitotic activity, indicated by decreases in cap volume and root length, and it was consequently suggested that control of intercellular activities in the root meristem may be directed through polysaccharide metabolism. Low concentrations of A1 (≤ 1,25 mg dm ¯³) produced a positive growth response in the primary root. This coincided with an increase in mean cap volume and these events were interpreted as an A1-induced release of the proximal meristem from growth inhibition originating in the cap. Experiments which followed the effect of decapping on the morphology of quiescent centre cells in the presence and absence of A1 supported the existence of a Golgi apparatus-derived morphogen involved in the control of Golgi apparatus secretory activity and plastid differentiation. In contrast to the controls (0 ABA). treatment of decapped roots with 2 X 10[-4] and 5 X 10[-5] M abscisic acid inhibited the development of Golgi apparatus secretory activity and plastid differentiation. It is postulated therefore, that an early response to AI may involve inhibition of the basipetal movement of an endogenous growth inhibitor originating in the cap, which may be ABA. The presence of A1 in the nutrient solution caused an efflux of H[+] from the root. Some of the more adverse plant responses to AI were initiated at A1 concentrations where the molar ratio of charge between Ca[2+] and A1[3+] favoured A1. An hypothesis for an electrophysiological plant response to A1 involving membrane hyperpolarisation by Al ions is developed. Chemical analysis of plant fractions did not connect A1-induced nutrient disorders with the primary expression of A1 toxicity

Addressing Bias in LGBTQIA+ Undergraduate Medical Education: An Innovative and Community Based Approach to Curriculum Reform

Background: Individuals who are LGBTQIA+ or gender nonconforming have specific health needs and face health disparities that are exacerbated by a lack of training and cultural sensitivity among health professionals. This study was initiated by a second year University of Massachusetts School of Medicine student in response to the lack of LGBTQIA+ health content in the first year Doctoring & Clinical Skills (DCS1) course. The DCS1 session on collecting a sexual history was selected as the primary focus for revision. Community-Based Participatory Research, because of its emphasis on joining with a community of interest as full and equal partners in all phases of the research process, served as an ideal model for the novel application to curriculum development to address this gap in training in undergraduate medical education. Methods: A sample of 13 LGBTQIA+ community members from Worcester were recruited to form a curriculum advisory committee. The committee convened for two focus-group style meetings where they reviewed the curriculum and had the opportunity to provide their feedback, which was used to rewrite the session. Additionally, the community members had the opportunity to participate in a storytelling video where they discussed their experiences in healthcare as LGBTQIA+ patients. A pre-test post-test design was used to survey the UMMS SOM students in order to evaluate the new version of the DCS1 session. Results: The percentage of M1 students reporting they had the necessary skills to treat LGBTQIA+ patients increased from pre-session to post-session (26.2% (n=130), 63.2% (n=76), p = \u3c 0.001). Compared to current M2 students who completed the course last year (n=65), more MS1 students (n=76) rated the overall quality of the DCS1 session as excellent or good (23.1%, 77.6%, p= \u3c 0.0001. Conclusion: CBPR serves as an efficacious model for the creation of curriculum inclusive of LGBTQIA+ health

Multiphoton localization and propagating quantum gap solitons in a frequency gap medium

The many-particle spectrum of an isotropic frequency gap medium doped with impurity resonance atoms is studied using the Bethe ansatz technique. The spectrum is shown to contain pairs of quantum correlated ``gap excitations'' and their heavy bound complexes (``gap solitons''), enabling the propagation of quantum information within the classically forbidden gap. In addition, multiparticle localization of the radiation and the medium polarization occurs when such a gap soliton is pinned to the impurity atom.Comment: 8 pages, RevTEX, to appear in Phys. Rev. Let

Extraordinary transition in the two-dimensional O(n) model

The extraordinary transition which occurs in the two-dimensional O(n) model for $n<1$ at sufficiently enhanced surface couplings is studied by conformal perturbation theory about infinite coupling and by finite-size scaling of the spectrum of the transfer matrix of a simple lattice model. Unlike the case of $n\geq1$ in higher dimensions, the surface critical behaviour differs from that occurring when fixed boundary conditions are imposed. In fact, all the surface scaling dimensions are equal to those already found for the ordinary transition, with, however, an interesting reshuffling of the corresponding eigenvalues between different sectors of the transfer matrix.Comment: 18 pages, Latex, 12 eps figures; submitted to Nucl. Phys.