948 research outputs found

    A ray of sunshine in the COVID‑19 environment, with a virtual sunburst elective

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    Ornamental bulb crops as sources of medicinal and industrial natural products

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    Plants produce many diverse chemical compounds that are used in various industries. The aim of this thesis was to obtain an understanding of what is needed to convert an ornamental crop to a pharmaceutical crop. This included knowledge about regulatory issues and expectations from the industry regarding quality and safety of such crops. Based on this knowledge, a further aim was to determine how the cultivation practices of the model ornamental crop Narcissus pseudonarcissus, which contains the medicinal compound galanthamine, needed to be adapted. Some key points in the cultivation process were identified that may need to be adapted in the production of Narcissus bulbs as raw material for the pharmaceutical industry. These points were investigated in field experiments using NMR-based metabolomics as the main analytical tool. This contributed to a validated production chain of Narcissus pseudonarcissus bulbs suita ble for use as raw material for the extraction of galanthamine. Results from exploratory investigations into other ornamental bulb material for novel industrial products are also presented.UBL - phd migration 201

    ICT INVESTMENT EFFECTIVENESS IN THE SOUTH AFRICAN POST OFFICE: RECONSIDERING THE APPROACHES OF THE PAST 20 YEARS

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    Organisations have invested and continue to invest considerable resources in Information and Communication Technology (ICT). Much of this investment is made on the basis of guarantee than an expected return will occur. This study presents the results of an empirical study of the impact of ICT investment on performance at the South African Post office (SAPO). Six years of historical data, from 2005 to 2010, were obtained from the Chief Information Officer (CIO) of the SAPO and analysed. This included appropriate IT data and financial data from the organisation’s financial statements and balance sheet. ICT investments were tested against financial performance indicators such as return on ICT investment, operating leverage, turnover growth, net profit, organisational risk, IT cost efficiency ratio and IT efficiency ratio. Within the period studied, it was observed that ICT investments at SAPO were negatively correlated with most of the financial indicators such as return on ICT investment, operating leverage, turn-over growth, net profit, organisational risk and IT efficiency ratio. This study therefore suggests that ICT investments at SAPO for the mentioned period did not have desirable impact on financial performance of the organisation. In order to realise tangible financial benefits of the ICT investments at SAPO, the research results suggest that a longer period needs to be considered, and should also include like non-technological determinants such as competence and experience levels of IT personnel, alignment of IT strategy with business strategy and business process re-engineering to suit new systems needs to be considered too prior to making any investments in ICT

    International educational tourism : does it foster global learning? A survey of South African high school learners

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    International educational tourism has the potential to foster global learning; however, very little empirical research exists to support this claim. This study responds to the growing demand in the literature for rigorous empirical research to test the underpinning assumption of IET. A global learning survey instrument is developed and completed by 1152 Grade 11 learners in 16 South African exclusive high schools. In doing so, this paper demonstrates that some types of IET are more conducive to global learning than others. Furthermore, for significant global learning to occur, educational tourism needs to be facilitated and cultural difference needs to be experienced. Personality traits that include curiosity, altruism, and being open-minded to new experiences, are identified as predictors of global learning, but the effect of school-based academic achievement is small. Additionally, through the synthesis of educational tourism, international education, experiential learning and global learning theories, the concept of IET is developed.University of Pretoriahttp://www.elsevier.com/locate/tourman2018-10-30hj2017Marketing ManagementTourism Managemen

    Endogenous orienting modulates the Simon effect: critical factors in experimental design

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    Responses are faster when the side of stimulus and response correspond than when they do not correspond, even if stimulus location is irrelevant to the task at hand: the correspondence, spatial compatibility effect, or Simon effect. Generally, it is assumed that an automatically generated spatial code is responsible for this effect, but the precise mechanism underlying the formation of this code is still under dispute. Two major alternatives have been proposed: the referential-coding account, which can be subdivided into a static version and an attention-centered version, and the attention-shift account. These accounts hold clear-cut predictions for attentional cuing experiments. The former would assume a Simon effect irrespective of attentional cuing in its static version, whereas the attention-centered version of the referential-coding account and the attention-shift account would predict a decreased Simon effect on validly as opposed to invalidly cued trials. However, results from previous studies are equivocal to the effects of attentional cuing on the Simon effect. We argue here that attentional cueing reliably modulates the Simon effect if some crucial experimental conditions, mostly relevant for optimizing attentional allocation, are met. Furthermore, we propose that the Simon effect may be better understood within the perspective of supra-modal spatial attention, thereby providing an explanation for observed discrepancies in the literature
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