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This work demonstrates that magnetohydrodynamic (MHD) stable, quasi-isodynamic (QI) stellarator equilibria with reduced turbulence can be generated with an optimised coilset. We present one such equilibrium which, when being generated by coils, maintains the benefits of its excellent QI quality (low neoclassical transport at small particle collisionality net toroidal current and good fast-particle confinement) while demonstrating ideal-MHD stability and lower ion-temperature-gradient-driven turbulent heat flux than W7-X. As a consequence of its optimised rotational transform profile, this plasma equilibrium has nested flux surfaces and a chain of large islands at the plasma’s edge, for which we present an island divertor design. It additionally features an electron root – a large region in the plasma core in which the radial electric field points outwards, towards the plasma boundary – which provides a potential solution for preventing impurity accumulation in a fusion device.
Large biobanks offer unprecedented data for psychiatric genomic research, but concerns exist about representativeness and generalizability. This study examined depression prevalence and polygenic risk score (PRS) associations in the All of Us data to assess potential impacts of nonrepresentative sampling.
Methods
Depression prevalence and correlates were analyzed in two subsamples: those with self-reported personal medical history (PMH) data (N = 185,232 overall; N = 114,739 with genetic data) and those with electronic health record (EHR) data (N = 287,015 overall; N = 206,175 with genetic data). PRS weights were estimated across ancestry groups. Associations of PRS with depression were examined by state and ancestry.
Results
Depression prevalence varied across states in both PMH (16.7–35.9%) and EHR (0.2–45.8%) data. Concordance between PMH and EHR diagnoses was low (kappa: 0.29, 95% CI: 0.30–0.30). Overall, one standard deviation increase in depression PRS was associated with lifetime depression based on PMH (odds ratio [OR] = 1.05, 95% confidence interval [CI]: 1.04–1.07) and EHR (OR = 1.05, 95% CI: 1.04–1.07). Results were generally consistent by ancestry, with the strongest signal for European ancestry (PMH: OR = 1.10, 95% CI: 1.08–1.12; EHR: OR = 1.07, 95% CI: 1.05–1.10). Associations between PRS and lifetime depression were largely consistent and significant associations varied minimally (ORs = 1.06–1.45) by state of residence in both subsamples.
Conclusions
Recorded depression prevalence by state in All of Us demonstrates a wide range, likely reflecting recruitment differences, EHR data completeness, and true geographic variation; yet PRS associations remained relatively stable. As studies like All of Us expand, accounting for sample composition and measurement approaches will be crucial for generating actionable findings.
This article is concerned with the syntactic position of negation and how that connects to negation's morphological realization and semantic and pragmatic effects. We focus on the case of contracted negation in English, which may appear both before and after the grammatical subject, and which has been classically analyzed as involving a single syntactic element placed by syntactic rule into distinct linear positions. We argue that this analysis is incorrect and that, in fact, there are multiple negations in English which are not related by a syntactic movement rule. We use the rich and complex morphosyntactic and semantico-pragmatic variation in the behavior of negation in varieties of Scots to motivate the argument and to develop a new approach that comes with both empirical and theoretical advantages.
This article is concerned with the distribution of contracted auxiliaries in English, in particular the restriction against their occurrence in the immediate context of a gap created by movement or ellipsis. We document apparent exceptions to this restriction in varieties of Scots, all occurring in what we call the locative discovery expression. We analyze these as mirative constructions, and using new data from the Scots Syntax Atlas, we describe patterns of variation in the acceptance of auxiliary contractions in locative discovery expressions that provide clues as to the role of syntax in conditioning auxiliary contraction. Adapting the proposal in Wilder 1997, where contracted auxiliaries are prosodically incorporated into the following predicate, we provide an account in which the differences across dialects with respect to contraction are explained in terms of the availability of different abstract structures.
Species of the Burkholderia (B.) cepacia complex (Bcc) have been implicated in multiple nosocomial outbreaks linked to contaminated water-based products, including liquid soaps, mouthwash, and other non-alcoholic aqueous solutions.
Objective:
We describe two substantial healthcare-associated outbreaks of Bcc (B. cepacia and B. contaminans) in the United Kingdom and Ireland associated with contaminated products. We highlight the challenges during investigation and mitigation, and provide recommendations.
Methods:
A multidisciplinary, multi-stakeholder investigation across both outbreaks was adopted, involving interviews, trawling questionnaires, and targeted product sampling.
Results:
There were 153 and 66 confirmed cases in the B. cepacia and B. contaminans outbreaks, respectively. Cases predominantly comprised hospitalized individuals, and 70% of isolates were recovered from an invasive site. The outbreak strain of B. cepacia was isolated from non-sterile ultrasound gel. An analytical study suggested the B. contaminans cluster was also linked to ultrasound gel; however, a disinfectant wipe product was subsequently identified as the source (0–3 single nucleotide polymorphism differences between case and wipe isolates).
Outbreak control measures:
The affected disinfectant wipes were withdrawn. The ultrasound gel was not recalled but health system procurement was suspended, rapid clinical guidance was produced and a National Patient Safety Alert was issued. Inter-organizational partnership was required to mitigate risks.
Conclusion:
Identifying the source of outbreaks associated with contaminated products can be challenging, requiring complex multi-stakeholder interventions. We recommend a low threshold for investigation of Bcc clusters, adopting a multidisciplinary approach to investigation and mitigation, implementing interventions focusing on practice, and prompt product removal to protect patients.
Child video game playing (“gaming”) may lead to decreased child academic motivation. Conversely, children with low academic motivation may seek fulfillment through gaming. We examined bidirectional associations between child gaming and academic motivation across middle childhood.
Methods
Our analyses are based on 1,631 children (boys = 785) followed in the context of the Quebec Longitudinal Study of Child Development. Data on gaming and academic motivation were collected repeatedly at ages 7, 8, and 10. Measures of child gaming were parent-reported and reflect daily video game playing time. Measures of academic motivation were child self-reported and reflect enjoyment in learning mathematics, reading, and writing. To disentangle the directionality of associations, we estimated a random-intercept cross-lagged panel model to estimate bidirectional, within-person associations between gaming and academic motivation in a cohort of school-aged Canadian children.
Results
Our results revealed unidirectional associations whereby more frequent gaming by boys at age 7 years predicted lower academic motivation at age 8 years (β = −.11, 95% confidence interval [CI]: −.22 to −.01), and similarly, gaming by boys at age 8 years predicted lower academic motivation at age 10 years (β = −.10, 95% CI: −.19 to −.01). Changes in boys’ academic motivation did not contribute to subsequent changes in gaming. There were no associations between gaming and academic motivation for girls.
Conclusions
More time devoted to gaming among school-aged boys is associated with reduced academic motivation during a critical developmental period for the development of academic skills. Fostering healthy gaming habits may help promote academic motivation and success.
Mercier’s criterion is typically enforced as a hard operational limit in stellarator design. At the same time, past experimental and numerical studies have shown that this limit may often be surpassed, though the exact mechanism behind this nonlinear stability is not well understood. This work aims to contribute to our current understanding by comparing the nonlinear evolution of Mercier unstable Wendelstein stellarators with that of nonlinearly stable quasi-interchange modes in tokamaks. A high mirror, very low $\iota$, W7-X-like configuration is first simulated. Broad flow structures are observed, which produce a similar magnetohydrodynamic (MHD) dynamo term to that in hybrid tokamak discharges, leading to flux pumping. Unlike in tokamaks, there is no net toroidal current to counterbalance this dynamo, and it is unclear if it can be sustained to obtain a similar quasistationary nonlinear state. In the simulation, partial reconnection induced by the overlap of multiple interchange instabilities leads to a core temperature crash. A second case is then considered using experimental reconstructions of intermediate $\beta$ W7-AS discharges, where saturated low-n modes were observed experimentally, with sustained MHD signatures over tens of milliseconds. It is shown that these modes do not saturate in a benign quasistationary way in current simulations even in the presence of background equilibrium $\boldsymbol{E} \times \boldsymbol{B}$ flow shear. This leads to a burst of MHD behaviour, inconsistent with the sustained MHD signatures in the experiment. Nevertheless, the (1, 2) mode is observed at the experimental Spitzer resistivity, and its induced anomalous transport can be overcome using an experimentally relevant heat source, reproducing these aspects of the dynamics. The possible reasons for the discrepancies between experiment and simulation, and the observation of partial reconnection in contrast to flux pumping are discussed, in view of reproducing and designing for operation of stellarators beyond the Mercier stability limit.
Understanding how different symptoms co-occur and are correlated may provide insights into the pathophysiology of disease. The lack of group-to-individual generalizability of co-occurrence of symptoms was recently demonstrated by comparing intra-individual and inter-individual correlations in several psychological studies. Here, we investigate this phenomenon for lower urinary tract symptoms (LUTS).
Methods:
We analyzed data collected in the Symptoms of Lower Urinary Tract Dysfunction Research Network Recall Study. Participants responded to questions about their urinary symptoms for 25 consecutive days. These questions queried urologic symptoms including storage (urinary urgency, frequency, nocturia, and urinary incontinence), voiding (slow/weak stream), and post-micturition (incomplete emptying and post-micturition dribble) symptoms. We calculated Pearson correlation coefficients and cosine similarity measures and compared distributions of intra-individual and inter-individual (cohort) metrics.
Results:
Among 234 participants, distributions of intra-individual measures were 10-fold wider than those of inter-individual correlations. There are pairs of questions with distributions of correlations and cosine similarities containing individuals with extreme positive (>0.8) and extreme negative values (<–0.8). There are groups of participants with strong positive and negative correlations of urinary frequency and nocturia, urinary incontinence and weak flow, as well as strong negative and positive correlations of urinary frequency and dribbling. Information on these extreme groups is averaged out and lost in the inter-individual correlations.
Conclusions:
Lack of group-to-individual generalizability previously shown for psychological symptoms is confirmed for LUTS. Wealth of information on the co-occurrence and co-evolution of LUTS in the intra-individual correlations and cosine similarities corroborates heterogeneity of LUTS and can be useful for deep phenotyping and for identifying personalized treatments of LUTS.
People living with HIV/AIDS (PLWH) often experience co-morbid/co-occurring mental health conditions, e.g., depression, anxiety, and post-traumatic stress disorder (PTSD). In resource-limited settings, where provider shortages are common, task shifting and task sharing (i.e., service delivery by non-professionals) are recommended strategies to promote access to and utilization of mental health and psychosocial support (MHPSS) services among PLWH. We conducted a global scoping review of the literature on MHPSS task shifting and sharing intervention studies for PLWH. Data extracted and summarized included study characteristics, intervention components, whether trauma informed study design, how lay health workers (LHWs) were identified and trained to deliver MHPSS services, and findings related to mental health outcomes. Results indicated that from 2013 through 2022, published intervention research concerning task shifting and sharing approaches was much more prolific in low- and middle-income countries than in high-income countries. MHPSS interventions delivered by a variety of LHWs yielded promising associations on an array of mental health outcomes, including PTSD/trauma and suicidality, though understudied. Underreported details regarding LHW recruitment/selection, compensation, supervision and assessment made it difficult to identify common or best practices. Further research is needed to facilitate the adoption and implementation of MHPSS task shifting and sharing interventions.
Posttraumatic stress disorder (PTSD) has been associated with advanced epigenetic age cross-sectionally, but the association between these variables over time is unclear. This study conducted meta-analyses to test whether new-onset PTSD diagnosis and changes in PTSD symptom severity over time were associated with changes in two metrics of epigenetic aging over two time points.
Methods
We conducted meta-analyses of the association between change in PTSD diagnosis and symptom severity and change in epigenetic age acceleration/deceleration (age-adjusted DNA methylation age residuals as per the Horvath and GrimAge metrics) using data from 7 military and civilian cohorts participating in the Psychiatric Genomics Consortium PTSD Epigenetics Workgroup (total N = 1,367).
Results
Meta-analysis revealed that the interaction between Time 1 (T1) Horvath age residuals and new-onset PTSD over time was significantly associated with Horvath age residuals at T2 (meta β = 0.16, meta p = 0.02, p-adj = 0.03). The interaction between T1 Horvath age residuals and changes in PTSD symptom severity over time was significantly related to Horvath age residuals at T2 (meta β = 0.24, meta p = 0.05). No associations were observed for GrimAge residuals.
Conclusions
Results indicated that individuals who developed new-onset PTSD or showed increased PTSD symptom severity over time evidenced greater epigenetic age acceleration at follow-up than would be expected based on baseline age acceleration. This suggests that PTSD may accelerate biological aging over time and highlights the need for intervention studies to determine if PTSD treatment has a beneficial effect on the aging methylome.
People with severe mental illness (SMI) have a higher risk of premature mortality than the general population.
Aims
To investigate whether the life expectancy gap for people with SMI is widening, by determining time trends in excess life-years lost.
Method
This population-based study included people with SMI (schizophrenia, bipolar disorder and major depression) alive on 1 January 2000. We ascertained SMI from psychiatric hospital admission records (1981–2019), and deaths via linkage to the national death register (2000–2019). We used the Life Years Lost (LYL) method to estimate LYL by SMI and sex, compared LYL to the Scottish population and assessed trends over 18 3-year rolling periods.
Results
We included 28 797 people with schizophrenia, 16 657 with bipolar disorder and 72 504 with major depression. Between 2000 and 2019, life expectancy increased in the Scottish population but the gap widened for people with schizophrenia. For 2000–2002, men and women with schizophrenia lost an excess 9.4 (95% CI 8.5–10.3) and 8.2 (95% CI 7.4–9.0) life-years, respectively, compared with the general population. In 2017–2019, this increased to 11.8 (95% CI 10.9–12.7) and 11.1 (95% CI 10.0–12.1). The life expectancy gap was lower for bipolar disorder and depression and unchanged over time.
Conclusions
The life expectancy gap in people with SMI persisted or widened from 2000 to 2019. Addressing this entrenched disparity requires equitable social, economic and health policies, healthcare re-structure and improved resourcing, and investment in interventions for primary and secondary prevention of SMI and associated comorbidities.
History of prior mental disorder, particularly post-traumatic stress disorder (PTSD), increases risk for PTSD following subsequent trauma exposure. However, limited research has examined differences associated with specific prior mental disorders among people with PTSD.
Aims
The current study examined whether different prior mental disorders were associated with meaningful differences among individuals presenting to a specialist service for severe earthquake-related distress following the Canterbury earthquakes (N = 177).
Method
Two sets of comparisons were made: between participants with no history of prior disorder and participants with history of any prior disorder; and between participants with history of prior PTSD and those with history of other prior disorders. Comparisons were made in relation to sociodemographic factors, earthquake exposure, peri-traumatic distress, life events and current psychological functioning.
Results
Participants with any prior mental disorder had more current disorders than those with no prior disorder. Among participants with history of any prior disorder, those with prior PTSD reported more life events in the past 5 years than those with other prior disorders.
Conclusions
Findings suggest a history of any prior mental disorder contributes to increased clinical complexity, but not increased PTSD severity, among people with PTSD seeking treatment. Although post-disaster screening efforts should include those with prior mental disorders, it should also be recognised that those with no prior disorders are also at risk of developing equally severe PTSD.
Evidence-based insertion and maintenance bundles are effective in reducing the incidence of central line-associated bloodstream infections (CLABSI) in intensive care unit (ICU) settings. We studied the adoption and compliance of CLABSI prevention bundle programs and CLABSI rates in ICUs in a large network of acute care hospitals across Canada.
Archaeological sites in Northwest Africa are rich in human fossils and artefacts providing proxies for behavioural and evolutionary studies. However, these records are difficult to underpin on a precise chronology, which can prevent robust assessments of the drivers of cultural/behavioural transitions. Past investigations have revealed that numerous volcanic ash (tephra) layers are interbedded within the Palaeolithic sequences and likely originate from large volcanic eruptions in the North Atlantic (e.g. the Azores, Canary Islands, Cape Verde). Critically, these ash layers offer a unique opportunity to provide new relative and absolute dating constraints (via tephrochronology) to synchronise key archaeological and palaeoenvironmental records in this region. Here, we provide an overview of the known eruptive histories of the potential source volcanoes capable of widespread ashfall in the region during the last ~300,000 years, and discuss the diagnostic glass compositions essential for robust tephra correlations. To investigate the eruption source parameters and weather patterns required for ash dispersal towards NW Africa, we simulate plausible ashfall distributions using the Ash3D model. This work constitutes the first step in developing a more robust tephrostratigraphic framework for distal ash layers in NW Africa and highlights how tephrochronology may be used to reliably synchronise and date key climatic and cultural transitions during the Palaeolithic.
In this article, we describe and explain patterns of variation in acceptance of amn’t in varieties of Scots, drawing upon data from the Scots Syntax Atlas. Partly in line with findings from Bresnan (2001), we show that amn’t is much more widely accepted in inversion environments (amn’t I?) than in declaratives (I amn’t), but nevertheless, amn’t in declaratives is still accepted in certain regions of Scotland. We combine the productivity-based explanation of the amn’t gap in Yang (2016, 2017) with new insights into the syntax of Scots negation from Thoms et al. (2023) to provide a predictive account of the attested variation.
A perennial problem for sociolinguists interested in morphosyntactic variation is that such forms are often low frequency, making quantitative analysis difficult or impossible. However, sociolinguists have been generally reluctant to adopt methodologies from syntax, such as acceptability data gleaned from speaker intuition, due to the belief that these judgments are not necessarily reliable. In this article we present data from the Scots Syntax Atlas, which employs sociolinguistic methodologies in spoken data alongside the results of acceptability judgments. We target three morphosyntactic variables and compare and contrast these across the two data types in order to assess the reliability of the judgment data at community level. The results show that reliability is variable-dependent. For some variables, there is clear correlation; with others, it appears that, as Labov (1996) phrased it, ‘intuitions fail’. We discuss how factors such as salience, social stigma and local identity combine to govern the reliability of judgment data.
To compare receipt of acute cardiac care in people with versus without severe mental illness (SMI) and investigate the impact of the COVID-19 pandemic on any differences in care. We hypothesised that, compared with those without SMI, patients with an SMI are less likely to receive guideline recommended acute cardiac care and that disparities worsened as a result of the pandemic.
Methods
We conducted a cohort study using data from the CVD-COVID-UK resource, which links electronic health data from multiple sources. Our cohort included 95,125 adults with a non-ST-elevation MI (NSTEMI) recorded in the Myocardial Infarction National Audit Programme (MINAP) dataset between 1 November 2019 and 31 March 2022. We defined SMI as schizophrenia, schizoaffective disorders or bipolar disorder (BD), ascertained through recorded diagnosis in primary care or hospital admission records. We examined receipt of cardiac care standards for NSTEMI, including: admission to a cardiac ward; angiogram eligibility; receipt of angiogram (in those eligible); angiogram within 72 hours; secondary prevention medication prescribing at discharge, and arrangement of post-discharge cardiac rehabilitation. We used logistic regression to obtain odds ratios (ORs) for the association between SMI and receipt of each care indicator, adjusting for age, sex and time period. We tested for an interaction between SMI and time period in order to determine if any disparities had changed since the start of the COVID-19 pandemic.
Results
Within our cohort, 620 patients (0.6%) had schizophrenia and 575 (0.6%) had BD. Compared with people without SMI and after adjusting for age, sex and period, patients with an SMI were less likely to receive each of the cardiac care standards. For example, compared with those without SMI, those with SMI were less likely to: be admitted to a cardiac ward (schizophrenia: OR 0.72, 95% CI 0.61–0.85; BD: 0.74, 95% CI 0.63–0.88); be eligible for an angiogram (schizophrenia: 0.37, 95% CI 0.29–0.47; BD: 0.52, 95% CI 0.40–0.68); receive an angiogram (schizophrenia: 0.22, 95% CI 0.18–0.28; BD: 0.51, 95% CI 0.39–0.66); and receive an angiogram within 72 hours (schizophrenia: 0.71, 95% CI 0.56–0.90); BD: 0.80, 95% CI 0.64–1.00). We generally found no evidence that disparities had changed since the start of the COVID-19 pandemic.
Conclusion
We identified marked SMI disparities in receipt of acute cardiac care among people treated in hospital for a NSTEMI. Further research should seek to identify reasons for, and inform interventions to, address these disparities.
To understand the challenges and barriers experienced by health-care professionals (HCPs) in providing acute cardiac care to patients with severe mental illness (SMI) (schizophrenia, bipolar disorder or severe depression) admitted to hospital following a myocardial infarction (MI).
Methods
Semi-structured 1:1 videocall interviews with 12 HCPs in two central-Scotland Health Boards involved in delivering pre-/hospital acute care for a MI (paramedics, cardiology/A&E nurses, cardiology/A&E doctors). Interviewee recruitment was via clinical and research networks and newsletters e.g. the Scottish Ambulance Service, the Royal College of Nursing and Royal College of Physicians and through professional connections. Interviews were audio-recorded, transcribed verbatim and analysed thematically drawing on Braun & Clarke and using NVivo software.
Results
HCPs identified a number of challenges/barriers to providing optimal post-MI acute cardiac care to patients with a SMI across 3 key themes: patient-related; practitioner-related and system/environment-related. Core patient-related challenges/barriers included: diminished patient history capacities especially relating to chronology; the time-consuming nature of effective HCP-patient communication and engagement; medication and intervention concordance concerns and challenging patient behaviour including physical and verbal aggression or severe distress.
Practitioner-related challenges/barriers were: fears of appropriately managing patient behaviour; stigma towards patients with a SMI (putatively arising from knowledge deficits or generational/age-related effects); staff burnout due to length of service and pressures from extreme workloads.
Systemic issues included insufficient staffing precluding the additional time required for effective communication and the distressing nature of hospital environments for patients with a SMI. Side rooms were not routinely available even though these were identified as improving the environment for some patients. A core systemic finding, cited by all interviewees, was the lack of adequate training provision on caring for patients with a SMI. Additional system-level findings were degrees of challenges accessing input from the hospital psychiatric team especially outwith standard hours and problems obtaining rarer psychiatric medications potentially impacting patients’ mental health stability.
Positive findings included that HCPs are generally enthusiastic about providing high quality care to this patient group and to seek help with this. Some HCPs indicated that caring for mentally stable patients with a SMI does not differ from the general population.
Conclusion
Although HCPs aspired to providing optimal acute cardiac care for this patient group, patient-level, professional and systemic barriers often make this challenging. A key area for improvement is enhancing staff training in caring for patients with SMI, ideally delivered in-person.