Reflections 1988

The 1988 issue of Reflections is edited by Amanda Thomas with Jimmy Byrd and Joyce Compton Brown serving as layout editor and faculty adviser, respectively. Cover design is by Melissa Brown. Award winners of the student writing contest include: Melissa Brown, Bobby Beal, and Jimmy Byrd. This year the Art Department sponsored an art contest for all students whose submissions were chosen for publication. Award winners of the student art contest include: Melissa Brown, Henry Doo, and Craig Lewis. This issue includes a special tribute to Ruth Kiser, written by Sheila McClure, for her support of Reflections throughout the years.https://digitalcommons.gardner-webb.edu/reflections/1013/thumbnail.jp

Sustaining evolving teaching practicum models in higher education: A conversational ethnodrama between South African teacher educators

This article explores the evolving trajectory of the Teaching Practicum (TP) models within a selected South African teacher education institution (TEI) to accommodate the localised challenges of shifting from face-to-face support of professional learning towards online modes of delivery during Covid-19 times. Over time, even before the onset of Covid-19, the specific institution was characterised by increasing diversification of its student body and increased enrolment of student teachers resonating with similar patterns across other TEIs nationally. The study draws on the ethnographic tradition of celebrating participants’ lived experiences within the field of teacher education by capturing how a teaching practicum coordinator attempted to deal with complex and multiple challenges to enact and sustain a re-imagined TP programme. The pattern of responsiveness continues even as the pandemic (potentially) wanes. A reconstructed dialogue represents the responses of the internal coordinator within the institution (foregrounding changing operational concerns) and a senior teacher educator external to the institution (foregrounding shifting theoretical and policy considerations). Drawing from ethnodrama traditions, this dialogical conversation acknowledges the lived experiences of everyday designing, delivering and using TP models. It includes the hesitance of school mentors, student teachers and teacher educator supervisors to adopt alternative practices to conventionalised rituals of TP. The conversation questions the academic rationale of the various models of TP in their bolstering of student teachers’ professional learning. The study’s findings indicate that the successful implementation of a meaningful and contextualised revised TP curriculum necessitates re-imagining the roles of the various partners involved in the TP endeavour: who are co-responsible for conceptualising and ensuring transformative professional growth and development

Alfalfa Varieties

Alfalfa (Medicago sativa) is the highest yielding, highest quality legume forage crop raised in Kentucky. This crop forms the basis of Kentucky\u27s cash hay enterprise and is an important component in dairy, horse, beef and sheep diets. In 1990, 320,000 acres of alfalfa were produced in Kentucky, averaging 3.4 tons of dry matter yield per acre. At $75 per ton, the value of this alfalfa to Kentucky farmers would be$81.6 million. This report will provide current yield data on alfalfa varieties currently in the Kentucky Alfalfa Variety Trials. Also, guidelines on selecting alfalfa varieties will be discussed

Elemental Abundances in the X-Ray Gas of Early-Type Galaxies with XMM and Chandra Observations

The source of hot gas in elliptical galaxies is thought to be due to stellar mass loss, with contributions from supernova events and possibly from infall from a surrounding environment. This picture predicts supersolar values for the metallicity of the gas toward the inner part of the galaxy, which can be tested by measuring the gas phase abundances. We use high-quality data for 10 nearby early-type galaxy from XMM-Newton, featuring both the EPIC and the Reflection Grating Spectrometer, where the strongest emission lines are detected with little blending; some Chandra data are also used. We find excellent consistency in the elemental abundances between the different XMM instruments and good consistency with Chandra. Differences in abundances with aperture size and model complexity are examined, but large differences rarely occur. For a two-temperature thermal model plus a point source contribution, the median Fe and O abundances are 0.86 and 0.44 of the Solar value, while Si and Mg abundances are similar to that for Fe. This is similar to stellar abundances for these galaxies but supernovae were expected to enhance the gas phase abundances considerably, which is not observed.Comment: 35 pages, 10 figures, accepted for publication in Astrophysical Journa

Advances in Alfalfa Variety Development and Testing

Alfalfa (Medicago sativa) is historically the highest yielding, highest quality forage legume grown in Kentucky. It forms the basis of Kentucky\u27s cash hay enterprise and is an important component in dairy, horse, beef and sheep diets. Over 300,000 acres of alfalfa are grown annually in Kentucky, with state yields averaging between 3 and 4 tons per acre. The development and testing of alfalfa varieties is a dynamic process that impacts all Kentucky farmers. The Kentucky Alfalfa Variety Testing program was re-started in 1990 and is carried out through the efforts of several people, including Leonard Lauriault, Linda Brown (Western Kentucky University), Garry Lacefield, Paul Vincelli, and John Parr. Alfalfa varieties are being studied for yield in 6 plot studies over 3 locations (Lexington, Bowling Green, and Princeton). Other research being conducted include the effect of aphanomyces root rot on variety yield and persistence and the effect of variety on forage quality

Treatment With siRNA and Antisense Oligonucleotides Targeted to HIF-1α Induced Apoptosis in Human Tongue Squamous Cell Carcinomas

Overexpression of hypoxia inducible factor-1α (HIF-1α) in cancers has been correlated to a more aggressive tumor phenotype. We investigated the effect of HIF-1α knockout on the in vitro survival and death of human tongue squamous cell carcinomas (SCC-4 and SCC-9). Under normoxic condition, a basal level of HIF-1α protein was constitutively expressed in SCC-9 cells, albeit an undetectable level of HIF-1α messages. Exposure to hypoxia induced only a transient increase in mRNA transcript but a prolonged elevation of HIF-1α protein and its immediate downstream target gene product, VEGF. Under normoxic or hypoxic conditions, treatment of SCC-9 cells with AS-HIF-1α ODN suppressed both constitutive and hypoxia-induced HIF-1αa expression at both mRNA and protein levels; Knockout of HIF-αa gene expression via either AS-HIF-1α ODN or siRNA (siRNA HIF-1α treatment resulted in inhibition of cell proliferation and induced apoptosis in SCC-4 and SCC-9 cells. We also demonstrated that exposure of SCC-9 cells to hypoxia led to a time-dependent increase In the expression of bcl-2 and IAP-2, but not p53. The attenuated levels of bcl-2 and IAP-2, and the enhanced activity of caspase-3 after treatment with AS-HIF-1α ODN may contribute partly to the effects of HIF-1α blockade on SCC-9 cell death. Collectively, our data suggest that a constitutive or hypoxia-induced expression of HIF-1α In SCC-9 and SCC-4 cells is sufficient to confer target genes expression essential for tumor proliferation and survival. As a result, interfering with HIF-1α pathways by antisense or siRNA strategy may provide a therapeutic target for human tongue squamous cell carcinomas. © 2004 Wiley-Liss, Inc

Targeting of anionic membrane species by lanthanide(III) complexes: towards improved MRI contrast agents for apoptosis

No abstract available