138 research outputs found

    Back to the future: digital decision making

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    The process of making decisions about the conception, design, development, deployment and regulation of complex information and communications technologies (ICT) systems with the potential to effect significant changes in society could be labelled 'digital decision making' (or DDM for short). DDM is not the rational process that we might assume or wish it to be. It can even be difficult to define the boundaries of the social, political or technical environments to which the process applies. It depends on craft knowledge, power and agenda, politics and situational messiness, personal values, law and environment, and a host of other factors starkly illustrated by cases ranging from the Three Mile Island to the space shuttle Challenger disasters. Too often DDM leads to information systems failures and it is time we started to learn from those past failures

    Amyloid precursor protein drives down-regulation of mitochondrial oxidative phosphorylation independent of amyloid beta

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    Amyloid precursor protein (APP) and its extracellular domain, soluble APP alpha (sAPP╬▒) play important physiological and neuroprotective roles. However, rare forms of familial AlzheimerтАЩs disease are associated with mutations in APP that increase toxic amyloidogenic cleavage of APP and produce amyloid beta (A╬▓) at the expense of sAPP╬▒ and other non-amyloidogenic fragments. Although mitochondrial dysfunction has become an established hallmark of neurotoxicity, the link between A╬▓ and mitochondrial function is unclear. In this study we investigated the effects of increased levels of neuronal APP or A╬▓ on mitochondrial metabolism and gene expression, in human SH-SY5Y neuroblastoma cells. Increased non-amyloidogenic processing of APP, but not A╬▓, profoundly decreased respiration and enhanced glycolysis, while mitochondrial DNA (mtDNA) transcripts were decreased, without detrimental effects to cell growth. These effects cannot be ascribed to A╬▓ toxicity, since higher levels of endogenous A╬▓ in our models do not cause oxidative phosphorylation (OXPHOS) perturbations. Similarly, chemical inhibition of ╬▓-secretase decreased mitochondrial respiration, suggesting that non-amyloidogenic processing of APP may be responsible for mitochondrial changes. Our results have two important implications, the need for caution in the interpretation of mitochondrial perturbations in models where APP is overexpressed, and a potential role of sAPP╬▒ or other non-amyloid APP fragments as acute modulators of mitochondrial metabolism

    тАШGrowing your ownтАЩ: a multi-level modelling approach to understanding personal food growing trends and motivations in Europe

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    Growing food for personal and family consumption is a significant global activity, but one that has received insufficient academic attention, particularly in developed countries. This paper uses data from the European Quality of Life Survey (EQLS) to address three areas of particular concern: the prevalence of growing your own food and how this has changed over time; the individual and household context in which growing takes place; and whether those who grow their own food are happier than those who do not. Results showed that there was a marked increase in growing your own food in Europe, in the period 2003тАУ2007. This increase is largely associated with poorer households and thus, possibly, economic hardship. In the UK however the increase in growing your own food is predominantly associated with older middle class households. Across Europe, whether causal or not, those who grew their own were happier than those who did not. The paper therefore concludes that claims about the gentrification of growing your own may be premature. Despite contrary evidence from the UK, the dominant motive across Europe appears to be primarily economic тАФ to reduce household expenditure whilst ensuring a supply of fresh food
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