Pitfalls and possibilities in literacy research: A review of South African literacy studies, 2004-2018

Background: Given the comprehensively documented literacy crisis in South Africa and the gaps in what is known about the effective teaching of reading and writing in schools, high-quality literacy research is a priority. Objectives: This article evaluates South African research from two annotated bibliographies on reading in African languages at home language level (2004-2017) and South African research on teaching reading in English as a first additional language (2007-2018). It also aims to provide guidelines for addressing these weaknesses. Methods: Examples of 70 quantitative and qualitative research studies from the annotated bibliographies were critically analysed, identifying key weaknesses in the research as a whole and examples of excellent quality. Results: Weaknesses evident in the research reviewed, suggested greater consideration is needed to lay sound methodological foundations for quality literacy research. Three methodological issues underlying local literacy research that require greater attention are research design, selection and use of literature and research rigour. High-quality research examples are referenced but, for ethical reasons, examples of what we consider to be flawed research are described generally. Guidelines are offered for addressing these pitfalls that, in our view, contribute to research of limited quality. Since many universities require submission of a journal article as a requirement for postgraduate students, preparation for such an article is considered. Conclusion: While this article is not intended to be a comprehensive guide, we hope it is useful to supervisors, postgraduate students and early career researchers currently undertaking, or planning to undertake, literacy research and to writing for publication

Sector, landscape or rural transformations? Exploring the limits and potential of agricultural sustainability initiatives through a cocoa case study

This paper analyses the changing nature of sustainability initiatives and their capacity to tackle sustainability challenges, focusing on cocoa in West Africa, and distilling lessons pertinent across agro-export industries and regions. Using data from empirical studies, literature review and consultations with key cocoa actors, we find ‘sustainable’ cocoa at a critical juncture. Applying an existing theoretical framework that distinguishes between resilience, transition and transformation of systems, we explore and analyse previous, current and future sustainability responses. We conclude that there are important innovations and upscaling of investment occurring in the cocoa sector on sustainability, but also that current approaches risk achieving only incremental change, helping to sustain the industry under deteriorating conditions (resilience), without enabling smallholders to claim rights and greater representation (transition) or tackling more fundamental root causes of the vulnerability of smallholders (transformation)

Navigating institutional complexity: The production of risk culture in the financial sector

Earlier versions of this paper were presented at the EGOS 2014 Colloquium, at research seminars at Copenhagen Business School and HEC Lausanne, and, under the title ‘Searching for Risk Culture’, as a keynote address at the SAMS/JMS annual conference on Managing Complexity Within and Across Organizational Boundaries at Cambridge University, March 2014. The authors are grateful for the helpful comments of Mats Alvesson, Roger Friedland, Matthew Hall, Silvia Jordan, Steve Maguire and Iain Munro, as well as the editors of the special issue of JMS on Managing Complexity. The authors gratefully acknowledge the financial support of the Economic and Social Research Council (ESRC), the Chartered Insurance Institute (CII), the Chartered Institute of Management Accountants (CIMA) and the Lighthill Risk Network

A proof of the Mazur-Orlicz theorem via the Markov-Kakutani common fixed point theorem, and vice versa

In this paper, we present a new proof of the Mazur-Orlicz theorem, which uses the Markov-Kakutani common fixed point theorem, and a new proof of the Markov-Kakutani common fixed point theorem, which uses the Mazur-Orlicz theorem

Influenza A virus survival in water is influenced by the origin species of the host cell

Background: Influenza A viruses have an envelope made of a lipid bilayer and two surface glycoproteins, the hemagglutinin and the neuraminidase. The structure of the virus is directly dependent on the genetic makeup of the viral genome except the glycosylation moieties and the composition of the lipid bilayer. They both depend on the host cell and are in direct contact with the environment, such as air or water. Virus survival is important for virus transmission from contaminated waters in the case of wild aquatic birds or from contaminated surface or air for humans. Objective: The objective of this study was to check whether the origin species of the host cell has an influence on influenza A virus survival. Method: The persistence in water at 35°C of viruses grown on either mammalian cells or avian cells and belonging to two different subtypes H1N1 and H5N1 was compared. Results: Both H5N1 and H1N1 viruses remained infectious for periods of time as long as 19-25 days, respectively. However, within the same subtype, viruses grown on mammalian cells were more stable in water at 35°C than their counterparts grown on avian cells, even for viruses sharing the same genetic background. Conclusions: This difference in virus stability outside the host is probably connected to the nature of the lipid bilayer taken from the cell or to the carbohydrate side chains of the virus surface glycoproteins. Moreover, the long-lasting survival time might have a critical role in the ecology of influenza viruses, especially for avian viruses

Electron attachment-induced DNA single-strand breaks at the pyrimidine sites

To elucidate the contribution of pyrimidine in DNA strand breaks caused by low-energy electrons (LEEs), theoretical investigations of the LEE attachment-induced C3′–O3′, and C5′–O5′ σ bond as well as N-glycosidic bond breaking of 2′-deoxycytidine-3′,5′-diphosphate and 2′-deoxythymidine-3′,5′-diphosphate were performed using the B3LYP/DZP++ approach. The base-centered radical anions are electronically stable enough to assure that either the C–O or glycosidic bond breaking processes might compete with the electron detachment and yield corresponding radical fragments and anions. In the gas phase, the computed glycosidic bond breaking activation energy (24.1 kcal/mol) excludes the base release pathway. The low-energy barrier for the C3′–O3′ σ bond cleavage process (∼6.0 kcal/mol for both cytidine and thymidine) suggests that this reaction pathway is the most favorable one as compared to other possible pathways. On the other hand, the relatively low activation energy barrier (∼14 kcal/mol) for the C5′–O5′ σ bond cleavage process indicates that this bond breaking pathway could be possible, especially when the incident electrons have relatively high energy (a few electronvolts). The presence of the polarizable medium greatly increases the activation energies of either C–O σ bond cleavage processes or the N-glycosidic bond breaking process. The only possible pathway that dominates the LEE-induced DNA single strands in the presence of the polarizable surroundings (such as in an aqueous solution) is the C3′–O3′ σ bond cleavage (the relatively low activation energy barrier, ∼13.4 kcal/mol, has been predicted through a polarizable continuum model investigation). The qualitative agreement between the ratio for the bond breaks of C5′–O5′, C3′–O3′ and N-glycosidic bonds observed in the experiment of oligonucleotide tetramer CGAT and the theoretical sequence of the bond breaking reaction pathways have been found. This consistency between the theoretical predictions and the experimental observations provides strong supportive evidences for the base-centered radical anion mechanism of the LEE-induced single-strand bond breaking around the pyrimidine sites of the DNA single strands

Winter territory prospecting is associated with life-history stage but not activity in a passerine

Finding a high quality territory is essential for many animals to reproduce successfully. Despite its importance for fitness, we know little about the process of territory prospecting in wild birds, and whether individual traits and behaviours, such as personality, co-vary with territory prospecting. Here, we use long-term data from a wild, insular house sparrow Passer domesticus population to test three hypotheses about territory fidelity and prospecting: (1) House sparrows show high territory fidelity between years and also during winter. (2) Individuals will prospect for a breeding territory during their first winter whereas older, more experienced individuals will keep a territory from previous years and will, therefore, show no or reduced winter territory prospecting. (3) More active behavioural types will prospect more than less active behavioural types. We use data from four winters from automatically, daily recorded nest-box visits of 188 birds of known age. The number of nest-boxes that each individual visited within each winter was used as a proxy of winter territory prospecting. We show that house sparrows visit multiple nest-boxes during their first winter, whereas older individuals keep territories year-round and, potentially because of this, indeed show reduced winter territory prospecting. Activity was not associated with the number of nest-boxes visited. Further research is needed to investigate whether time of territory and mate acquisition differs among individuals and the possible effect on lifetime fitness

Inequivalent Quantizations of the Rational Calogero Model

We show that the rational Calogero model with suitable boundary condition admits quantum states with non-equispaced energy levels. Such a spectrum generically consists of infinitely many positive energy states and a single negative energy state. The new states appear for arbitrary number of particles and for specific ranges of the coupling constant. These states owe their existence to the self-adjoint extensions of the corresponding Hamiltonian, which are labelled by a real parameter z. Each value of z corresponds to a particular spectrum, leading to inequivalent quantizations of the model.Comment: Revtex file, 6 pages, 1 figure, minor changes in the text, version to appear in Phys. Lett.

Intact implicit statistical learning in borderline personality disorder

Wide-spread neuropsychological deficits have been identified in borderline personality disorder (BPD). Previous research found impairments in decision making, declarative memory, working memory and executive functions; however, no studies have focused on implicit learning in BPD yet. The aim of our study was to investigate implicit statistical learning by comparing learning performance of 19 BPD patients and 19 healthy, age-, education- and gender-matched controls on a probabilistic sequence learning task. Moreover, we also tested whether participants retain the acquired knowledge after a delay period. To this end, participants were retested on a shorter version of the same task 24 hours after the learning phase. We found intact implicit statistical learning as well as retention of the acquired knowledge in this personality disorder. BPD patients seem to be able to extract and represent regularities implicitly, which is in line with the notion that implicit learning is less susceptible to illness compared to the more explicit processes