7,901 research outputs found
Recommended from our members
Science and Technology Studies in Policy: the UK Synthetic Biology Roadmap
In this paper, we reflect on our experience as Science and Technology Studies (STS) researchers who were members of the working group that produced A Synthetic Biology Roadmap for the UK in 2012. We explore how this initiative sought to govern an uncertain future, and describe how it was successfully used to mobilize public funds for synthetic biology from the UK government. We discuss our attempts to incorporate the insights and sensibilities of STS into the policy process, and why we chose to use the concept of Responsible Research and Innovation (RRI) to do so. We analyze how the roadmapping process, and the final report, narrowed and transformed our contributions to the Roadmap. We show how difficult it is for STS researchers to influence policy when our ideas challenge deeply entrenched pervasive assumptions, framings and narratives about how technological innovation necessarily leads to economic progress, about public reticence as a roadblock to that progress, and about the supposed separation between science and society. We end by reflecting on the constraints under which we were operating from the outset, and on the challenges for STS in policy
The Contribution of HIV to Mortality in Pregnant and Postpartum Women
Background: High levels of HIV and maternal mortality go hand in hand in many regions of sub-Saharan Africa. Therefore, understanding the interaction between pregnancy and HIV is important, not only for the clinical management of pregnant women, but also for the measurement of maternal mortality, the standard definition of which excludes infectious causes of death not aggravated by pregnancy.
Methods: In this thesis the excess mortality attributable to HIV in pregnant and postpartum women is calculated by comparing the risk of mortality in HIV-infected pregnant and postpartum women to their uninfected counterparts using two different data sources: 1) studies identified through a systematic review and; 2) data from six demographic surveillance sites (DSS) in sub-Saharan Africa. Verbal autopsy (VA) data from the DSS are also used to explore the percentage of deaths classified as HIV/AIDS-related. Two additional systematic reviews are conducted to assess whether HIV increases the risk of obstetric complications, or pregnancy accelerates HIV disease progression.
Results: HIV-infected women have eight times the risk of pregnancy-related mortality compared with HIV-uninfected women. Based on this estimate, we predict that roughly a quarter of deaths in pregnant or postpartum women are attributable to HIV in sub-Saharan Africa. A lower percentage of pregnancy-related deaths are attributed to HIV/AIDS using VA data. There is little evidence that HIV-infected women are at increased risk of direct obstetric complications, with the exception of sepsis, or that pregnancy increases the risk of HIV disease progression.
Conclusion: HIV may cause up to 25% of deaths during pregnancy and in the postpartum period in areas of high HIV prevalence. Most of the evidence suggests that this excess pregnancy-related mortality attributable to HIV is largely coincidental to pregnancy. This implies that there is little reason to discourage healthy, HIV-infected women from becoming pregnant if they desire to do so
Increasing vertical mixing to reduce Southern Ocean deep convection in NEMO3.4
Most CMIP5 (Coupled Model Intercomparison Project Phase 5) models unrealistically form Antarctic Bottom Water by open ocean deep convection in the Weddell and Ross seas. To identify the mechanisms triggering Southern Ocean deep convection in models, we perform sensitivity experiments on the ocean model NEMO3.4 forced by prescribed atmospheric fluxes. We vary the vertical velocity scale of the Langmuir turbulence, the fraction of turbulent kinetic energy transferred below the mixed layer, and the background diffusivity and run short simulations from 1980. All experiments exhibit deep convection in the Riiser-Larsen Sea in 1987; the origin is a positive sea ice anomaly in 1985, causing a shallow anomaly in mixed layer depth, hence anomalously warm surface waters and subsequent polynya opening. Modifying the vertical mixing impacts both the climatological state and the associated surface anomalies. The experiments with enhanced mixing exhibit colder surface waters and reduced deep convection. The experiments with decreased mixing give warmer surface waters, open larger polynyas causing more saline surface waters and have deep convection across the Weddell Sea until the simulations end. Extended experiments reveal an increase in the Drake Passage transport of 4 Sv each year deep convection occurs, leading to an unrealistically large transport at the end of the simulation. North Atlantic deep convection is not significantly affected by the changes in mixing parameters. As new climate model overflow parameterisations are developed to form Antarctic Bottom Water more realistically, we argue that models would benefit from stopping Southern Ocean deep convection, for example by increasing their vertical mixing
Ultrasonic locating devices for central venous cannulation: meta-analysis
OBJECTIVES: To assess the evidence for the clinical
effectiveness of ultrasound guided central venous
cannulation.
DATA SOURCES: 15 electronic bibliographic databases,
covering biomedical, science, social science, health
economics, and grey literature.
DESIGN: Systematic review and meta-analysis of
randomised controlled trials.
POPULATIONS: Patients scheduled for central venous
access.
INTERVENTION REVIEWED: Guidance using real time two
dimensional ultrasonography or Doppler needles and
probes compared with the anatomical landmark
method of cannulation.
DATA EXTRACTION: Risk of failed catheter placement
(primary outcome), risk of complications from
placement, risk of failure on first attempt at
placement, number of attempts to successful
catheterisation, and time (seconds) to successful
catheterisation.
DATA SYNTHESIS: 18 trials (1646 participants) were
identified. Compared with the landmark method, real
time two dimensional ultrasound guidance for
cannulating the internal jugular vein in adults was
associated with a significantly lower failure rate both
overall (relative risk 0.14, 95% confidence interval
0.06 to 0.33) and on the first attempt (0.59, 0.39 to
0.88). Limited evidence favoured two dimensional
ultrasound guidance for subclavian vein and femoral
vein procedures in adults (0.14, 0.04 to 0.57 and 0.29,
0.07 to 1.21, respectively). Three studies in infants
confirmed a higher success rate with two dimensional
ultrasonography for internal jugular procedures (0.15,
0.03 to 0.64). Doppler guided cannulation of the
internal jugular vein in adults was more successful
than the landmark method (0.39, 0.17 to 0.92), but the
landmark method was more successful for subclavian
vein procedures (1.48, 1.03 to 2.14). No significant
difference was found between these techniques for
cannulation of the internal jugular vein in infants. An
indirect comparison of relative risks suggested that
two dimensional ultrasonography would be more
successful than Doppler guidance for subclavian vein
procedures in adults (0.09, 0.02 to 0.38).
CONCLUSIONS: Evidence supports the use of two
dimensional ultrasonography for central venous
cannulation
Pregnancy has a minimal impact on the acute transcriptional signature to vaccination.
Vaccination in pregnancy is an effective tool to protect both the mother and infant; vaccines against influenza, pertussis and tetanus are currently recommended. A number of vaccines with a specific indication for use in pregnancy are in development, with the specific aim of providing passive humoral immunity to the newborn child against pathogens responsible for morbidity and mortality in young infants. However, the current understanding about the immune response to vaccination in pregnancy is incomplete. We analysed the effect of pregnancy on early transcriptional responses to vaccination. This type of systems vaccinology approach identifies genes and pathways that are altered in response to vaccination and can be used to understand both the acute inflammation in response to the vaccine and to predict immunogenicity. Pregnant women and mice were immunised with Boostrix-IPV, a multivalent vaccine, which contains three pertussis antigens. Blood was collected from women before and after vaccination and RNA extracted for analysis by microarray. While there were baseline differences between pregnant and non-pregnant women, vaccination induced characteristic patterns of gene expression, with upregulation in interferon response and innate immunity gene modules, independent of pregnancy. We saw similar patterns of responses in both women and mice, supporting the use of mice for preclinical screening of novel maternal vaccines. Using a systems vaccinology approach in pregnancy demonstrated that pregnancy does not affect the initial response to vaccination and that studies in non-pregnant women can provide information about vaccine immunogenicity and potentially safety
The Indian family on UK reality television: Convivial culture in salient contexts
This is the author's accepted manuscript. The final published article is available from the link below, copyright 2012 @ the author.This article demonstrates how The Family (2009), a fly-on-the wall UK reality series about a British Indian family, facilitates both current public service broadcasting requirements and mass audience appeal. From a critical cultural studies perspective, the author examines the journalistic and viewer responses to the series where authenticity, universality, and comedy emerge as major themes. Textual analysis of the racialized screen representations also helps locate the series within the contexts of contested multiculturalism, genre developments in reality television and public service broadcasting. Paul Gilroy’s concept of convivial culture is used as a frame in understanding how meanings of the series are produced within a South Asian popular representational space. The author suggests that the social comedy taxonomy is a prerequisite for the making of this particular observational documentary. Further, the popular (comedic) mode of conviviality on which the series depends is both expedient and necessary within the various sociopolitical contexts outlined
Current practices in patient-reported outcome (PRO) data collection in clinical trials:a cross-sectional survey of UK trial staff and management
Objectives
Patient-reported outcome measures (PROMs) collected in clinical trials should be administered in a standardised way across sites and routinely screened for avoidable missing data in order to maximise data quality/minimise risk of bias. Recent qualitative findings, however, have raised concerns about the consistency of PROM administration in UK trials. The purpose of this study was to determine the generalisability of these findings across the wider community of trial personnel.
Design
Online cross-sectional survey.
Setting
Participants were recruited from 55 UK Clinical Research Collaboration Registered Clinical Trials Units and 19 Comprehensive Local Research Networks.
Participants
Research nurses, data managers/coordinators, trial managers and chief/principal investigators involved in clinical trials collecting PROMs.
Analysis
We undertook descriptive analyses of the quantitative data and directed thematic analysis of free-text comments. Factors associated with the management of missing PRO data were explored using logistic regression.
Results
Survey data from 767 respondents supported the generalisability of qualitative study findings, suggesting inconsistencies in PROM administration with regard to: the level of assistance given to trial participants; the timing of PROM completion in relation to the clinical consultation; and the management of missing data. Having ≥10 years experience in a research role was significantly associated with the appropriate management of missing PROM data (OR 2.26 (95% CI 1.06 to 4.82), p=0.035). There was a consensus that more PROM guidance was needed in future trials and agreement between professional groups about the necessary components.
Conclusions
There are inconsistencies in the way PROMs are administered by trial staff. Such inconsistencies may reduce the quality of data and have the potential to introduce bias. There is a need for improved guidance in future trials that support trial personnel in conducting optimal PROM data collection to inform patient care
Ensuring Payload Safety in Missions with Special Partnerships
The National Aeronautics and Space Administration (NASA) Expendable Launch Vehicle (ELV) payload space flight missions involve cooperative work between NASA and partners including spacecraft (or payload) contractors, universities, nonprofit research centers, Agency payload organization, Range Safety organization, Agency launch service organizations, and launch vehicle contractors. The role of NASA's Safety and Mission Assurance (SMA) Directorate is typically fairly straightforward, but when a mission's partnerships become more complex, to realize cost and science benefits (e.g., multi-agency payload(s) or cooperative international missions), the task of ensuring payload safety becomes much more challenging. This paper discusses lessons learned from NASA safety professionals working multiple-agency missions and offers suggestions to help fellow safety professionals working multiple-agency missions
Quantum Chessboards in the Deuterium Molecular Ion
We present a new algorithm for vibrational control in deuterium molecules
that is feasible with current experimental technology. A pump mechanism is used
to create a coherent superposition of the D2+ vibrations. A short, intense
infrared control pulse is applied after a chosen delay time to create selective
interferences. A `chessboard' pattern of states can be realized in which a set
of even- or odd-numbered vibrational states can be selectively annihilated or
enhanced. A technique is proposed for experimental realization and observation
of this effect using 5 fs pulses of 790 nm radiation, with intermediate
intensity (5e13 W/cm2)Comment: 12 pages, 5 figure
- …
