Infrastructures of immobility: enabling international distance education students in Africa to <i>not</i> move

There is now a large literature discussing how mobilities are part of contemporary everyday power geometries and is a resource to which people have unequal access (Massey 1994; Sheller and Urry 2006). This body of work has, thus, valorised mobility as a desirable good. Why some people choose immobility and what has to be mobilised to enable this immobility has received much less attention. This paper draws on interviews with international distance education students in Namibia and Zimbabwe studying at the University of South Africa (UNISA) to explore the spatio-temporal underpinnings to why students choose to remain at home while studying abroad and how this is arranged. It outlines the infrastructures of reach that enable student immobility and how their incomplete nature means that students have to rely on extensive systems of mobilities of other people and objects to ensure that their study progresses without their own educational mobility. In doing so we move away from considering immobility as a result of limited access to mobility. Instead we set out a new research agenda on why and how the infrastructures of immobilities are important in mobility research

Dry-transfer of aligned multiwalled carbon nanotubes for flexible transparent thin films

Herein we present an inexpensive facile wet-chemistry-free approach to the transfer of chemical vapour-deposited multiwalled carbon nanotubes to flexible transparent polymer substrates in a single-step process. By controlling the nanotube length, we demonstrate accurate control over the electrical conductivity and optical transparency of the transferred thin films. Uniaxial strains of up to 140% induced only minor reductions in sample conductivity, opening up a number of applications in stretchable electronics. Nanotube alignment offers enhanced functionality for applications such as polarisation selective electrodes and flexible supercapacitor substrates. A capacitance of 17 F/g was determined for supercapacitors fabricated from the reported dry-transferred MWCNTs with the corresponding cyclic voltagrams showing a clear dependence on nanotube length.Peer Reviewe

Re-locating memories: transnational and local narratives of Indian South Africans in Cape Town

This article plays on the word re-location to examine the memories of Indians in South Africa through oral histories about relocation as a result of the Group Areas Act, to memories of parents and grandparents relocating to South Africa from India as told to interviewees and to their own memories of journeys to India and back. The narratives of mobilities traverse time and national boundaries and are counter-posed by narratives of local mobilities as well as stasis. The article identifies ways of narrating, themes of narration and the meaning of memories while noting the re-location of memory construction against the backdrop of South Africa’s democratic transition and the 150th commemoration of the arrival of indentured Indians to South Africa. It argues that the local and the national are important in narrations of transnational journeys, thus advancing a particular approach to transnational memory studies

Yeast : the soul of beer’s aroma—a review of flavour-active esters and higher alcohols produced by the brewing yeast

Among the most important factors influencing beer quality is the presence of well-adjusted amounts of higher alcohols and esters. Thus, a heavy body of literature focuses on these substances and on the parameters influencing their production by the brewing yeast. Additionally, the complex metabolic pathways involved in their synthesis require special attention. More than a century of data, mainly in genetic and proteomic fields, has built up enough information to describe in detail each step in the pathway for the synthesis of higher alcohols and their esters, but there is still place for more. Higher alcohols are formed either by anabolism or catabolism (Ehrlich pathway) of amino acids. Esters are formed by enzymatic condensation of organic acids and alcohols. The current paper reviews the up-to-date knowledge in the pathways involving the synthesis of higher alcohols and esters by brewing yeasts. Fermentation parameters affecting yeast response during biosynthesis of these aromatic substances are also fully reviewed.Eduardo Pires gratefully acknowledges the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) for the PhD fellowship support (SFRH/BD/61777/2009). The financial contributions of the EU FP7 project Ecoefficient Biodegradable Composite Advanced Packaging (EcoBioCAP, grant agreement no. 265669) as well as of the Grant Agency of the Czech Republic (project GACR P503/12/1424) are also gratefully acknowledged. The authors thank the Ministry of Education, Youth and Sports of the Czech Republic (MSM 6046137305) for their financial support

Ca isotope fingerprints of early crust-mantle evolution

Among the most important factors influencing beer quality is the presence of well-adjusted amounts of higher alcohols and esters; as well as the successful reduction of undesirable by-products such as diacetyl. While higher alcohols and esters contribute rather positively to the beer aroma, diacetyl is mostly unwelcome for beer types with lighter taste. Thus, the complex metabolic pathways in yeast responsible for the synthesis of both pleasant and unpleasant by-products of fermentation were given special attention in this last chapter

Canagliflozin and renal outcomes in type 2 diabetes and nephropathy

BACKGROUND Type 2 diabetes mellitus is the leading cause of kidney failure worldwide, but few effective long-term treatments are available. In cardiovascular trials of inhibitors of sodium–glucose cotransporter 2 (SGLT2), exploratory results have suggested that such drugs may improve renal outcomes in patients with type 2 diabetes. METHODS In this double-blind, randomized trial, we assigned patients with type 2 diabetes and albuminuric chronic kidney disease to receive canagliflozin, an oral SGLT2 inhibitor, at a dose of 100 mg daily or placebo. All the patients had an estimated glomerular filtration rate (GFR) of 30 to &lt;90 ml per minute per 1.73 m2 of body-surface area and albuminuria (ratio of albumin [mg] to creatinine [g], &gt;300 to 5000) and were treated with renin–angiotensin system blockade. The primary outcome was a composite of end-stage kidney disease (dialysis, transplantation, or a sustained estimated GFR of &lt;15 ml per minute per 1.73 m2), a doubling of the serum creatinine level, or death from renal or cardiovascular causes. Prespecified secondary outcomes were tested hierarchically. RESULTS The trial was stopped early after a planned interim analysis on the recommendation of the data and safety monitoring committee. At that time, 4401 patients had undergone randomization, with a median follow-up of 2.62 years. The relative risk of the primary outcome was 30% lower in the canagliflozin group than in the placebo group, with event rates of 43.2 and 61.2 per 1000 patient-years, respectively (hazard ratio, 0.70; 95% confidence interval [CI], 0.59 to 0.82; P=0.00001). The relative risk of the renal-specific composite of end-stage kidney disease, a doubling of the creatinine level, or death from renal causes was lower by 34% (hazard ratio, 0.66; 95% CI, 0.53 to 0.81; P&lt;0.001), and the relative risk of end-stage kidney disease was lower by 32% (hazard ratio, 0.68; 95% CI, 0.54 to 0.86; P=0.002). The canagliflozin group also had a lower risk of cardiovascular death, myocardial infarction, or stroke (hazard ratio, 0.80; 95% CI, 0.67 to 0.95; P=0.01) and hospitalization for heart failure (hazard ratio, 0.61; 95% CI, 0.47 to 0.80; P&lt;0.001). There were no significant differences in rates of amputation or fracture. CONCLUSIONS In patients with type 2 diabetes and kidney disease, the risk of kidney failure and cardiovascular events was lower in the canagliflozin group than in the placebo group at a median follow-up of 2.62 years

The effect of building integration on the temperature and performance of photovoltaic modules

Building integrated photovoltaics (BIPV), in particular roof-integrated PV is an aesthetically attractive option for many homes, but is understood to perform slightly below on-roof mounting of traditional modules as a result of the poorer ventilation. Previous studies have attempted to quantify this effect empirically for a variety of cell types. However, the performance varies significantly with location, both due to weather conditions and local construction practices, which in turn leads to different levels of ventilation and thermal gradients. We hereby use a purpose built roof construction with 4 different roof configurations and integrate monocrystalline Si modules in each to quantify differences in annual yields resulting from each roof type. Over the course of a year, a module embedded in the most common tiled roof type generates ca. 3% less energy than an onroof equivalent