International student mobility : the role of social networks

Building upon recent work on higher education mobility, this paper contends that social networks of friendship and kinship are critical determinants for students deciding to study overseas, not just, as has hitherto been suggested, a complementary factor. It uses original data collected through interviews and focus groups with thirty-eight higher education international students studying at three UK universities and argues that students who choose to study overseas do not operate within a vacuum but rather draw upon extended networks of individuals who have chosen to do so themselves or advocate studying abroad. While this encouragement may be of an explicit and unequivocal nature – telling students that they ought to study overseas – for the majority it is rather more implicit. The students interviewed invariably related that higher education overseas or mobility more generally was an accepted practice amongst their peers, thereby leading to a normalisation of the mobility process. The paper concludes that international students come to accept mobility as a taken for granted stage within the lifecourse, and, whether intentionally or not, this is often the driving force behind their decision to study overseas

The Fractal Dimension of Projected Clouds

The interstellar medium seems to have an underlying fractal structure which can be characterized through its fractal dimension. However, interstellar clouds are observed as projected two-dimensional images, and the projection of a tri-dimensional fractal distorts its measured properties. Here we use simulated fractal clouds to study the relationship between the tri-dimensional fractal dimension (D_f) of modeled clouds and the dimension resulting from their projected images. We analyze different fractal dimension estimators: the correlation and mass dimensions of the clouds, and the perimeter-based dimension of their boundaries (D_per). We find the functional forms relating D_f with the projected fractal dimensions, as well as the dependence on the image resolution, which allow to estimatethe "real" D_f value of a cloud from its projection. The application of these results to Orion A indicates in a self-consistent way that 2.5 < D_f < 2.7 for this molecular cloud, a value higher than the result D_per+1 = 2.3 some times assumed in literature for interstellar clouds.Comment: 27 pages, 13 figures, 1 table. Accepted for publication in ApJ. Minor change

Time for a Nappy Change: beliefs and attitudes towards modern cloth nappies.

The United Nations Environment Programme highlights how the use of disposable nappies has become unsustainable, yet the practice of using modern cloth nappies (MCN) is niche. This study uses mixed methods of survey, story completion and focus group methods to explore how behaviour beliefs and attitudes to behaviour contribute to families’ decision making regarding the nappy system they use for their children. 1588 responded to the survey; 38 completed story completion activity; 24 participated in groups. This study finds that beliefs about the performance as a nappy, environmental credentials, financial considerations, laundry, effort, and hygiene differ according to the level of personal experience of using MCN. While beliefs about the environmentalcredentials of MCN create powerful drivers for the intention to use MCN, other beliefs about the upfront costs, laundry and effort contribute a negative attitude to MCN overall if their support network of other MCN users is not established. Current MCN users found using cloth nappy retailer websites, nappy libraries, and social media groups, including pre-loved and-sell groups, to be beneficial in improving attitude to MCN. This study concludes that interventions that simultaneously reduce or remove perceived barriers such as upfront costs, financial risks and too much effort, paired with campaigns which increase the likelihood of finding support, are more likely, than individual interventions, to be effective in increasing the number of families using MCN.Further study is needed to investigate the potential of interventions which reduce the financial risks such as, easy to access hire kits, spread the cost of MCN and pre-natal and newborn public services such as midwives and health visitors being well informed and encouraging of the use of MCN.<br/

Time for a Nappy Change: controls affecting families’ nappy choices

Lifecycle assessments suggest that modern cloth nappies have fewer environmental impacts than their disposablecounterparts in terms of GHG, plastic and landfill (UNEP 2021). However, despite these apparent environmentalbenefits consumers still use predominantly disposable nappies. This paper will use theories of plannedbehaviour to explore the differences in perceived and actual behaviours between disposable and cloth nappyusers. A self-selecting web-based survey was used to recruit participants with children up to the age of fiveand explore their decision-making in this regard. The findings of the survey reveal that disposable nappy usersare more likely to prioritise convenience and to cite additional laundry loads as the main reasons for not usingcloth nappies. This is despite tending to have the necessary infrastructure (such as disposable income, spaceand washing facilities) to enable them to do so. This indicates that the perceptions of home-laundered clothnappies as inconvenient makes families more likely to opt for disposable nappies. Whilst cloth nappies weregenerally assumed to be more environmentally friendly and aesthetically pleasing by all parents irrespectiveof their choices, this was not enough to overcome the convenience and ease of use for the majority of participants.This study concludes that many disposable nappy users select disposable nappies with the assumptionthat they are easier and more convenient when this may not be the case. The implication of this study is thatinterventions which improve the convenience of cloth nappies and the perception of ease of use will encouragegreater uptake of cloth nappies.References.UNEP. (2021) Recommendations from Life Cycle Assessments Single-use nappies and their alternatives hostedby. United Nations Environment Programme

Molecular and morphological characterization of the tapeworm Taenia hydatigena (Pallas, 1766) in sheep from Iran

Although Taenia hydatigena is one of the most prevalent taeniid species of livestock, very little molecular genetic information exists for this parasite. Up to 100 sheep isolates of T. hydatigena were collected from 19 abattoirs located in the provinces of Tehran, Alborz and Kerman. A calibrated microscope was used to measure the larval rostellar hook lengths. Following DNA extraction, fragments of cytochrome c oxidase 1 (CO1) and 12S rRNA genes were amplified by the polymerase chain reaction method and the amplicons were subjected to sequencing. The mean total length of large and small hooks was 203.4 μm and 135.9 μm, respectively. Forty CO1 and 39 12S rRNA sequence haplotypes were obtained in the study. The levels of pairwise nucleotide variation between individual haplotypes of CO1 and 12S rRNA genes were determined to be between 0.3-3.4% and 0.2-2.1%, respectively. The overall nucleotide variation among all the CO1 haplotypes was 9.7%, and for all the 12S rRNA haplotypes it was 10.1%. A significant difference was observed between rostellar hook morphometry and both CO1 and 12S rRNA sequence variability. A significantly high level of genetic variation was observed in the present study. The results showed that the 12S rRNA gene is more variable than CO1. © 2013 Cambridge University Press

Citizens Apart? Representing post-Brexit youth politics in the UK media

In 2016, the UK voted to leave the European Union (EU). This outcome was not only unexpected but also had clear geographical and age-bound divisions. While people over the age of 65 tended to vote to leave, younger voters were more likely to vote to remain a part of the EU. Reflecting on 7 years of journalism, this paper explores the ways in which young people have been represented by the news media with regards to the issue of Brexit. It analyses a database of 700 news media articles published from 2016 to 2022 across the UK, equating to 100 articles per calendar year and ranging from regional sources to those with an international reach. The paper showcases how young people occupy liminal spaces within the news media through an analysis of the language used to describe their political participation, and a focus on their role within political activism. As it is this media that dominates hegemonic narratives within traditional political spheres, the retelling and representation of young people's engagement serves, we argue, to reinforce their liminality as citizens apart.</p

Extension of nano-confined DNA: quantitative comparison between experiment and theory

The extension of DNA confined to nanochannels has been studied intensively and in detail. Yet quantitative comparisons between experiments and model calculations are difficult because most theoretical predictions involve undetermined prefactors, and because the model parameters (contour length, Kuhn length, effective width) are difficult to compute reliably, leading to substantial uncertainties. Here we use a recent asymptotically exact theory for the DNA extension in the "extended de Gennes regime" that allows us to compare experimental results with theory. For this purpose we performed new experiments, measuring the mean DNA extension and its standard deviation while varying the channel geometry, dye intercalation ratio, and ionic buffer strength. The experimental results agree very well with theory at high ionic strengths, indicating that the model parameters are reliable. At low ionic strengths the agreement is less good. We discuss possible reasons. Our approach allows, in principle, to measure the Kuhn length and effective width of a single DNA molecule and more generally of semiflexible polymers in solution.Comment: Revised version, 6 pages, 2 figures, 1 table, supplementary materia

Processing and formulation insights for designing quality into lyophilised biopharmaceuticals

This thesis makes an original contribution to the field of formulation development by providing new experimental data and insights into the effect of processing and formulation conditions on the quality of lyophilised biopharmaceuticals. The quality attributes of lyophilised products include: a quick reconstitution time, product elegance and protein stability, which are known to be affected by processing and formulation parameters. However, choice of formulation excipients or processing conditions often relies on previous experience rather than mechanistic insight. The motivation of this thesis was therefore to provide a greater understanding of how process variables andexcipient choice affect these quality attributes. Bovine serum albumin (BSA) and immunoglobulin G (IgG) were used as model proteins to investigate formulation conditions, which included the excipient, the lyophilisation cooling profile and duration of the annealing step. BSA was also used as a model protein to explore the effects of sucrose and arginine as lyoprotectants. Unique to this study was the investigation of arginine salts as lyoprotectants, wherein the counterions were dicarboxylic acids with increasing chain length. Two key results regarding quality attributes were observed. Firstly, characterisation of the lyophilised structure established that there was an optimal annealing time, beyond which there was an increase in primary drying time, batch heterogeneity and variable moisture content. Secondly, a relationship was found between decreasing dicarboxylic acid chain length and improved protein stability. To explain these findings, two mechanisms are proposed that account for ice crystal growth during annealing and the observed changes in protein stability at the molecular level. Significantly, this research provides insights for future formulation development studies