Managing sleep and wakefulness in a 24 hour world

This article contributes to literature on the sociology of sleep by exploring the sleeping practices and subjective sleep experiences of two social groups: shift workers and students. It draws on data, collected in the UK from 25 semi-structured interviews, to discuss the complex ways in which working patterns and social activities impact upon experiences and expectations of sleep in our wired awake world. The data show that, typically, sleep is valued and considered to be important for health, general wellbeing, appearance and physical and cognitive functioning. However, sleep time is often cut back on in favour of work demands and social activities. While shift workers described their efforts to fit in an adequate amount of sleep per 24-hour period, for students, the adoption of a flexible sleep routine was thought to be favourable for maintaining a work–social life balance. Collectively, respondents reported using a wide range of strategies, techniques, technologies and practices to encourage, overcome or delay sleep(iness) and boost, promote or enhance wakefulness/alertness at socially desirable times. The analysis demonstrates how social context impacts not only on how we come to think about sleep and understand it, but also how we manage or self-regulate our sleeping patterns

An atomic force microscopy and molecular simulations study of the inhibition of barite growth by phosphonates

The effect of five phosphonic acids (hydroxyethylene diphosphonic acid, HEDP; nitro trimethyl phosphonic acid, NTMP; methylene diphosphonic acid, MDP; amino methylene phosphonic acid, AMP; and sodium phosphonobutane tricarboxylic acid, PBTC) on the growth of the barite(0 0 1) face has been investigated using atomic force microscopy (AFM). Experimental data have been obtained by in situ measurements of the velocities of barite monomolecular steps growing from solutions with different concentrations of each phosphonic acid. Adsorption isotherms, constructed by plotting individual monomolecular step rates versus inhibitor concentrations, indicate a Langmuir adsorption mechanism in the range of concentrations from 0.5 to 10 lmol/l. Both affinity constants calculated from adsorption isotherms and measurements of growth rates of barite monomolecular steps as a function of inhibitor concentration allowed us to give the following ranking of inhibitor effectiveness: PBTC>NTMP>MDP>HEDPAMP. Molecular simulations of the interaction of the phosphonic acids with barite(0 0 1) surfaces indicate that only kink sites along monomolecular steps can be considered as possible inhibition sites. This is in agreement with the AFM observations and measurements

Ageing and memory medication : social rationales and consumption practices

"This article focuses on the social rationales underlying the consumption or rejection of medication for memory by the elderly. Our analysis is set within the wider frame of the current use of psychopharmaceuticals for the enhancement of everyday performance, discussing its relationship to new cultures of ageing. Our results, from a recently concluded study, point to different patterns of investment in memory in old age. On the one hand, we found a willingness to consume medication for memory - a heterogeneous disposition split between the imaginary of disease and that of performance enhancement. On the other hand, we found a cultural resistance and scepticism towards the use of psychopharmaceuticals for performance purposes. This suggests that a new frame of psychopharmaceuticalization of old age - represented by memory medication - is prompting different rationales, ranging from consumption to resistance."info:eu-repo/semantics/publishedVersio

Public policy support for the informal venture capital market in Europe: A critical review

The ability of small firms to access finance is hindered by persistent market failure, which creates funding gaps for new businesses, particularly in technology sectors, seeking small amounts of finance. This has prompted various forms of public sector intervention to increase the supply of both debt and risk finance. For the past decade (longer in the UK) both the EU and its member states have increasingly focused on the informal venture capital market as a means of increasing the supply of early stage venture capital. This article describes the changing nature of the forms of intervention and provides a critical review of their effectiveness. The lack of data on angel investing means that there is very little evidence on the impact of these forms of intervention. The article advocates that governments should invest in appropriate methodologies which can accurately measure investment trends in the early stage venture capital market, and specifically angel investment activity, so that the need for public sector intervention can be demonstrated and the impact of such interventions can be measured

Polyphasic taxonomy of Aspergillus section Aspergillus (formerly Eurotium ), and its occurrence in indoor environments and food

Aspergillus section Aspergillus (formerly the genus Eurotium) includes xerophilic species with uniseriate conidiophores, globose to subglobose vesicles, green conidia and yellow, thin walled eurotium-like ascomata with hyaline, lenticular ascospores. In the present study, a polyphasic approach using morphological characters, extrolites, physiological characters and phylogeny was applied to investigate the taxonomy of this section. Over 500 strains from various culture collections and new isolates obtained from indoor environments and a wide range of substrates all over the world were identified using calmodulin gene sequencing. Of these, 163 isolates were subjected to molecular phylogenetic analyses using sequences of ITS rDNA, partial β-tubulin (BenA), calmodulin (CaM) and RNA polymerase II second largest subunit (RPB2) genes. Colony characteristics were documented on eight cultivation media, growth parameters at three incubation temperatures were recorded and micromorphology was examined using light microscopy as well as scanning electron microscopy to illustrate and characterise each species. Many specific extrolites were extracted and identified from cultures, including echinulins, epiheveadrides, auroglaucins and anthraquinone bisanthrons, and to be consistent in strains of nearly all species. Other extrolites are species-specific, and thus valuable for identification. Several extrolites show antioxidant effects, which may be nutritionally beneficial in food and beverages. Important mycotoxins in the strict sense, such as sterigmatocystin, aflatoxins, ochratoxins, citrinin were not detected despite previous reports on their production in this section. Adopting a polyphasic approach, 31 species are recognised, including nine new species. ITS is highly conserved in this section and does not distinguish species. All species can be differentiated using CaM or RPB2 sequences. For BenA, Aspergillus brunneus and A. niveoglaucus share identical sequences. Ascospores and conidia morphologyw, growth rates at different temperatures are most useful characters for phenotypic species identification