Vacuum phototriodes for the CMS electromagnetic calorimeter endcap

The measurement of scintillation light from the lead tungstate crystals of the Compact Muon Solenoid (CMS) electromagnetic calorimeter (ECAL) poses a substantial technical challenge, particularly in the endcap regions, where the radiation levels are highest. The photodetectors must be fast, sensitive, radiationhard, and operate with significant internal gain in a magnetic field of 4 Tesla. The measured performance characteristics of the first batches of series production vacuum phototriodes (VPT), developed to satisfy the needs of CMS, will be described

Dense, fast, radiation-tolerant Fluoro-Hafnate glass scintillators for electromagnetic calorimeters in high energy physics

Over 200 different compositions of heavy metal fluoride glasses have been produced and evaluated as possible candidates for the active medium in homogeneous electromagnetic calorimeters for high energy particles. Promising glasses, based on mixtures containing hafnium fluoride, have densities of 6 g/cm^3, radiation lengths of 1.6 cm, and good optical transmission from the UV to the IR. Glasses containing the Ce3+ ion are fast scintillators, with properties similar to those of pure cerium fluoride crystal. We have made glasses which have up to 14% of the light yield of CeF3, fast scintillation characterised by typical exponential decay constants of 10 ns and 25 ns, and a temperature dependence of light yield of -0.4%/C over the range -10C to 60C. We have carried out a detailed investigation of the effects of gamma irradiation (up to doses of 6kGy) on the optical transmission, and systematic studies into the role of indium and other elements on radiation tolerance and light yield. Some glasses have shown complete optical annealing of radiation-induced absorbance when exposed to UV light.PPAR

Airborne concentration and deposition of trace metals and metalloids in an urban area downwind of a manganese alloy plant

The evaluation of the content of metals and metalloids in particulate matter (PM) and in atmospheric deposition in areas impacted by local industries is essential from an environmental and health risk perspective. In this study, the PM10 levels and atmospheric deposition fluxes of potentially toxic metals and metalloids were quantified at three urban sites of the Cantabrian region (northern Spain), located at different distances downwind of a Mn alloy plant. The content of Mn, V, Fe, Ni, Cu, Zn, As, Mo, Cd, Sb and Pb in PM10 and in the water-soluble and insoluble fractions of the deposition was determined by ICP-MS. Among the studied elements, the highest concentrations in PM10 and deposition rates were found for Mn, Fe, Zn and Pb, associated with the Mn alloy industry, and for Cu, related to non-exhaust traffic emissions. The levels of Mn, Fe, Zn and Pb in PM10 were higher in autumn, when the most frequent winds blow from the S-SW, whereas their highest deposition rates were found in winter and autumn, which are characterized by high monthly average precipitations. The water-soluble fraction of the atmospheric deposition of most metals increased with distance from the Mn alloy plant. The highest water-soluble fractions were found for Ni (72%), Zn (62%), Cu (60%) and Mn (49%). These results will be useful for the health risk assessment of the metal exposure associated with Mn alloy plants, as well as for the evaluation of the metal burden to soil, water and ecosystems related to this industrial activity.This work was financially supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through the CTM2013-43904R Project. Ana Hernández-Pellón would like to thank the Ministry of Economy and Competitiveness (MINECO) for the FPI grant awarded, reference number BES-2014-068790

A whole-cell biosensor for the detection of gold

Geochemical exploration for gold (Au) is becoming increasingly important to the mining industry. Current processes for Au analyses require sampling materials to be taken from often remote localities. Samples are then transported to a laboratory equipped with suitable analytical facilities, such as Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) or Instrumental Neutron Activation Analysis (INAA). Determining the concentration of Au in samples may take several weeks, leading to long delays in exploration campaigns. Hence, a method for the on-site analysis of Au, such as a biosensor, will greatly benefit the exploration industry. The golTSB genes from Salmonella enterica serovar typhimurium are selectively induced by Au(I/III)-complexes. In the present study, the golTSB operon with a reporter gene, lacZ, was introduced into Escherichia coli. The induction of golTSB::lacZ with Au(I/III)-complexes was tested using a colorimetric β-galactosidase and an electrochemical assay. Measurements of the β-galactosidase activity for concentrations of both Au(I)- and Au(III)-complexes ranging from 0.1 to 5 µM (equivalent to 20 to 1000 ng g⁻¹ or parts-per-billion (ppb)) were accurately quantified. When testing the ability of the biosensor to detect Au(I/III)-complexes(aq) in the presence of other metal ions (Ag(I), Cu(II), Fe(III), Ni(II), Co(II), Zn, As(III), Pb(II), Sb(III) or Bi(III)), cross-reactivity was observed, i.e. the amount of Au measured was either under- or over-estimated. To assess if the biosensor would work with natural samples, soils with different physiochemical properties were spiked with Au-complexes. Subsequently, a selective extraction using 1 M thiosulfate was applied to extract the Au. The results showed that Au could be measured in these extracts with the same accuracy as ICP-MS (P<0.05). This demonstrates that by combining selective extraction with the biosensor system the concentration of Au can be accurately measured, down to a quantification limit of 20 ppb (0.1 µM) and a detection limit of 2 ppb (0.01 µM).Carla M. Zammit, Davide Quaranta, Shane Gibson, Anita J. Zaitouna, Christine Ta, Joël Brugger, Rebecca Y. Lai, Gregor Grass, Frank Reit

A Validated Model of Serum Anti-Müllerian Hormone from Conception to Menopause

Background Anti-Müllerian hormone (AMH) is a product of growing ovarian follicles. The concentration of AMH in blood may also reflect the non-growing follicle (NGF) population, i.e. the ovarian reserve, and be of value in predicting reproductive lifespan. A full description of AMH production up to the menopause has not been previously reported. Methodology/Principal Findings By searching the published literature for AMH concentrations in healthy pre-menopausal females, and using our own data (combined ) we have generated and robustly validated the first model of AMH concentration from conception to menopause. This model shows that 34% of the variation in AMH is due to age alone. We have shown that AMH peaks at age 24.5 years, followed by a decline to the menopause. We have also shown that there is a neonatal peak and a potential pre-pubertal peak. Our model allows us to generate normative data at all ages. Conclusions/Significance These data highlight key inflection points in ovarian follicle dynamics. This first validated model of circulating AMH in healthy females describes a transition period in early adulthood, after which AMH reflects the progressive loss of the NGF pool. The existence of a neonatal increase in gonadal activity is confirmed for females. An improved understanding of the relationship between circulating AMH and age will lead to more accurate assessment of ovarian reserve for the individual woman.Publisher PDFPeer reviewe

Nursing home care for people with dementia and residents' quality of life, quality of care and staff well-being: Design of the Living Arrangements for people with Dementia (LAD) - study

<p>Abstract</p> <p>Background</p> <p>There is limited information available on how characteristics of the organization of nursing home care and especially group living home care and staff ratio contribute to care staff well being, quality of care and residents' quality of life. Furthermore, it is unknown what the consequences of the increasingly small scale organization of care are for the amount of care staff required in 2030 when there will be much more older people with dementia.</p> <p>Methods/Design</p> <p>This manuscript describes the design of the 'Living Arrangements for people with Dementia study' (LAD-study). The aim of this study is to include living arrangements from every part of this spectrum, ranging from large scale nursing homes to small group living homes. The LAD-study exists of quantitative and qualitative research. Primary outcomes of the quantitative study are wellbeing of care staff, quality of care and quality of life of residents. Furthermore, data concerning staff ratio and characteristics of the living arrangements such as group living home care characteristics are assessed. To get more in-depth insight into the barriers and facilitators in living arrangements for people with dementia to provide good care, focus groups and Dementia Care Mapping are carried out.</p> <p>Discussion</p> <p>Results of this study are important for policymakers, directors and staff of living arrangements providing nursing home care to people with dementia and essential for the development of methods to improve quality of care, residents' and staff well-being. Data collection will be repeated every two years, to generate knowledge on the results of changing policies in this field.</p

An exploration of the implementation of open disclosure of adverse events in the UK : a scoping review and qualitative exploration

Background: In 2009 the UK National Patient Safety Agency relaunched its Being Open framework to facilitate the open disclosure of adverse events to patients in the NHS. The implementation of the framework has been, and remains, challenging in practice. Aim: The aim of this work was to both critically evaluate and extend the current evidence base relating to open disclosure, with a view to supporting the implementation of a policy of open disclosure of adverse events in the NHS. Methods: This work was conducted in three phases. The first phase comprised two focused systematic literature reviews, one summarising empirical research on the effectiveness of interventions to enhance open disclosure, and a second, broader scoping review, looking at reports of current opinion and practice and wider knowledge. The second phase involved primary qualitative research with the objective of generating new knowledge about UK-based stakeholders' views on their role in and experiences of open disclosure. Stakeholder interviews were analysed using the framework approach. The third phase synthesised the findings from the first two phases to inform and develop a set of short pragmatic suggestions for NHS trust management, to facilitate the implementation and evaluation of open disclosure. Results: A total of 610 papers met the inclusion criteria for the broad review. A large body of literature discussed open disclosure from a number of related, but sometimes conflicted, perspectives. Evidential gaps persist and current practice is based largely on expert consensus rather than evidence. There appears to be a tension between the existing pragmatic guidance and the more in-depth critiques of what being consistent and transparent in health care really means. Eleven papers met the inclusion criteria for the more focused review. There was little evidence for the effectiveness of disclosure alone on organisational or individual outcomes or of interventions to promote and support open disclosure. Interviews with stakeholders identified strong support for the basic principle of being honest with patients or relatives when someone was seriously harmed by health care. In practice however, the issues are complex and there is confusion about a number of issues relating to disclosure policies in the UK. The interviews generated insights into the difficulties perceived within health care at individual and institutional levels, in relation to fully implementing the Being Open guidance. Conclusions: There are several clear strategies that the NHS could learn from to implement and sustain a policy of openness. Literature reviews and stakeholder accounts both identified the potential benefits of a culture that was generally more open (not just retrospectively open about serious harm). Future work could usefully evaluate the impact of disclosure on legal challenges within the NHS, best practice in models of support and training for open disclosure, embedding disclosure conversations in critical incident analysis and disclosure of less serious events