Towards an evolutionary understanding of questing behaviour in the tick Ixodes ricinus

The tick Ixodes ricinus finds its hosts by climbing vegetation and adopting a sit-and-wait tactic. This “questing” behaviour is known to be temperature-dependent, such that questing increases with temperature up to a point where the vapor pressure deficit (drying effect) forces ticks down to rehydrate in the soil or mat layer. Little if any attention has been paid to understanding the questing of ticks from an evolutionary perspective. Here we ask whether populations from colder climatic conditions respond differently in terms of the threshold temperature for questing and the rate of response to a fixed temperature. We find significant variation between populations in the temperature sensitivity of questing, with populations from cooler climates starting questing at lower temperatures than populations from warmer temperatures. Cool climate populations also quest sooner when the temperature is held constant. These patterns are consistent with local adaptation to temperature either through direct selection or acclimation and challenge the use of fixed thresholds for questing in modeling the spread of tick populations. Our results also show how both time and temperature play a role in questing, but we are unable to explain the relationship in terms of degree-time used to model Arthropod development. We find that questing in response to temperature fits well with a quantitative genetic model of the conditional strategy, which reveals how selection on questing may operate and hence may be of value in understanding the evolutionary ecology of questing

Health Care Workers’ Perspectives of the Influences of Disrespectful Maternity Care in Rural Kenya

While disrespectful treatment of pregnant women attending health care facilities occurs globally, it is more prevalent in low-resource countries. In Kenya, a large body of research studied disrespectful maternity care (DMC) from the perspective of the service users. This paper examines the perspective of health care workers (HCWs) on factors that influence DMC experienced by pregnant women at health care facilities in rural Kisii and Kilifi counties in Kenya. We conducted 24 in-depth interviews with health care workers (HCWs) in these two sites. Data were analyzed deductively and inductively using NVIVO 12. Findings from HCWs reflective narratives identified four areas connected to the delivery of disrespectful care, including poor infrastructure, understaffing, service users’ sociocultural beliefs, and health care workers’ attitudes toward marginalized women. Investments are needed to address health system influences on DMC, including poor health infrastructure and understaffing. Additionally, it is important to reduce cultural barriers through training on HCWs’ interpersonal communication skills. Further, strategies are needed to affect positive behavior changes among HCWs directed at addressing the stigma and discrimination of pregnant women due to socioeconomic standing. To develop evidence-informed strategies to address DMC, a holistic understanding of the factors associated with pregnant women’s poor experiences of facility-based maternity care is needed. This may best be achieved through an intersectional approach to address DMC by identifying systemic, cultural, and socioeconomic inequities, as well as the structural and policy features that contribute and determine peoples’ behaviors and choice

Investigating special guardianship : experiences, challenges and outcomes

Special guardianship is overwhelmingly used for children, predominantly young children, living with relatives or family friends (mostly grandparents or aunts and uncles). Its location within kinship care is the most marked difference with adoption. In excess of 13,000 special guardianship orders were made within the study period. Almost two-thirds of children were reported to have been at risk of abuse or neglect (63.5 per cent)

The masses, radii and luminosities of the components of U Geminorum

We present a phase-resolved spectroscopic study of the secondary star in the cataclysmic variable U Gem. We use our data to measure the radial velocity semi-amplitude, systemic velocity and rotational velocity of the secondary star. Combining this with literature data allows us to determine masses and radii for both the secondary star and white dwarf which are independent of any assumptions about their structure. We use these to compare their properties with those of field stars and find that both components follow field mass-radius relationships. The secondary star has the mass, radius, luminosity and photometric temperature of an M2 star, but a spectroscopic temperature of M4. The latter may well be due to a high metallicity. There is a troubling inconsistency between the radius of the white dwarf inferred from its gravitational redshift and inclination and that inferred from its temperature, flux, and astrometric distance. We find that there are two fundamental limits to the accuracy of the parameters we can derive. First the radial velocity curve of the secondary star deviates from a sinusoid, in part because of its asphericity (which can be modelled) and in part because the line flux is not evenly distributed over its surface. Second we cannot be certain which spectral type is the best match for the lines of the secondary star, and the derived rotational velocity is a function of the spectral type of the template star used.Comment: 12 pages, 10 figures. Accepted for MNRA

Determining the spectroscopic mass ratio in interacting binaries: Application to X-Ray Nova Sco 1994

We present a model for determining the mass ratio in interacting binaries by directly fitting the observed spectrum with synthetic spectra. We make direct use of NextGen model atmospheres intensities which are the most comprehensive and detailed models available for cool stars. We fully take into account the varying temperature and gravity across the secondary star's photosphere, by incorporating the synthetic spectra into the secondary star's Roche geometry. As a result, we determine the exact rotationally broadened spectrum of the secondary star and so eliminate the need for a limb-darkening law, and the uncertainties associated with it. As an example we determine the mass ratio for the well studied soft X-ray transient Nova Sco 1994. In order to obtain a more accurate determination of the mass ratio, which does not depend on assumptions about the rotation profile and limb-darkening coefficients, we use our model to compute the exact rotationally broadened model spectrum, which we compare directly with the observed intermediate resolution spectrum of Nova Sco 1994. We determine the mass ratio of Nova Sco 1994 to be 0.419+/-0.028 (90 percent confidence), which is the most accurate determination of the binary mass ratio in an X-ray binary. This result combined with the binary mass function and inclination angle gives a refined black hole mass of 5.99+\-0.42 Mo (90 percent confidence). We also perform simulations which show that, for an F-type secondary star, the standard rotation profile with zero and continuum value for the line limb-darkening coefficient gives a value for q that brackets the value found using the full geometrical treatment.Comment: 11 pages including 5 figures, accepted by MNRA

Deliver on Your Own: Disrespectful Maternity Care in rural Kenya

Background: Under the Free Maternity Policy (FMP), Kenya has witnessed an increase in health facility deliveries rather than home deliveries with Traditional Birth Attendants (TBA) resulting in improved maternal and neonatal outcomes. Despite these gains, maternal and infant mortality and morbidity rates in Kenya remain unacceptably high indicating that more needs to be done. Aim: Using data from the Access to Quality Care through Extending and Strengthening Health Systems (AQCESS) project’s qualitative gender assessment, this paper examines women’s experience of disrespectful care during pregnancy, labour, and delivery. The goal is to promote an improved understanding of the actual care conditions to inform the development of interventions that can lift the standard of care, increase maternity facility use, and improve health outcomes for both women and newborns. Methodology: We conducted sixteen focus group discussions (FGDs), two each for adolescent females, adult females, adult males, and community health committee members. As well, twenty-four key Informants interviews (KII) were also conducted including religious leaders, and persons from local government representatives, Ministry of Health (MOH), and local women’s organizations. Data were captured through audio recordings and reflective field notes. Research site: Kisii and Kilifi Counties in Kenya. Findings: Findings show nursing and medical care during labour and delivery were at times disrespectful, humiliating, uncompassionate, neglectful, or abusive. In both counties, male health workers were preferred by women giving birth, as they were perceived as more friendly and sensitive. Adolescent females were more likely to report abuse during maternity care while women with disabled children reported being stigmatized. Structural barriers related to transportation and available resources at facilities associated with disrespectful care were identified. Conclusions: A focus on quality and compassionate care as well as more facility resources will lead to increased, successful, and sustainable use of facility care. Interpreting these results within a systems perspective, Kenya needs to implement, enforce, and monitor quality of care guidelines for pregnancy and delivery including respectful maternity care of pregnant women. To ensure these procedures are enforced, measurable benchmarks for maternity care need to be established, and hospitals need to be regularly monitored to ensure these benchmarks are achieved

A Disk-Wind Model for the Near-Infrared Excess Emission in Protostars

Protostellar systems, ranging from low-luminosity T Tauri and Herbig Ae stars to high-luminosity Herbig Be stars, exhibit a near-infrared (NIR) excess in their spectra that is dominated by a bump in the monochromatic luminosity with a peak near 3 microns. The bump can be approximated by a thermal emission component of temperature 1500 K that is of the order of the sublimation temperature of interstellar dust grains. In the currently popular "puffed up rim" scenario, the bump represents stellar radiation that propagates through the optically thin inner region of the surrounding accretion disk and is absorbed and reemitted by the dust that resides just beyond the dust sublimation radius, Rsub. However, this model cannot account for the strongest bumps measured in these sources, and it predicts a large secondary bounce in the interferometric visibility curve that is not observed. In this paper we present an alternative interpretation, which attributes the bump to reemission of stellar radiation by dust that is uplifted from the disk by a centrifugally driven wind. Winds of this type are a leading candidate for the origin of the strong outflows associated with protostars, and there is observational evidence for disk winds originating on scales ~Rsub. Using a newly constructed Monte Carlo radiative transfer code, we show that this model can account for the NIR excess emission even in bright Herbig Ae stars such as AB Auriga and MWC 275, and that it successfully reproduces the basic features of the visibilities measured in these protostars. We argue that a robust dusty outflow in these sources could be self-limiting to a relatively narrow launching region between Rsub and 2Rsub. Finally, we suggest that our model could also naturally account for the NIR and scattered-light variability exhibited by a source like MWC 275, which may be triggered by the uplifting of dust clouds from the disk.Comment: 19 pages, 8 figures. Updated submitted version to refereed and accepted one (accepted 8/29/2012 for publication in The Astrophysical Journal

Optical spectroscopy and Doppler tomography of Cygnus X-2

We present phase resolved optical spectroscopy and Doppler tomography of V1341 Cygni, the optical counterpart to the neutron star low mass X-ray binary Cygnus X-2. We derive a radial velocity curve for the secondary star, finding a projected radial velocity semi-amplitude of K2 = 79 +/- 3 km/s, leading to a mass function of 0.51 +/- 0.06 Msun, ~30% lower than the previous estimate. We tentatively attribute the lower value of K2 (compared to that obtained by other authors) to variations in the X-ray irradiation of the secondary star at different epochs of observations. The limited phase coverage and/or longer timebase of previous observations may also contribute to the difference in K2. Our value for the mass function implies a primary mass of 1.5 +/- 0.3 Msun, somewhat lower than previous dynamical estimates, but consistent with the value found by analysis of type-I X-ray bursts from this system. Our Doppler tomography of the broad He II 4686 line reveals that most of the emission from this line is produced on the irradiated face of the donor star, with little emission from the accretion disc. In contrast, the Doppler tomogram of the N III 4640.64 Bowen blend line shows bright emission from near the gas stream/accretion disc impact region, with fainter emission from the gas stream and secondary star. This is the first LMXB for which the Bowen blend is dominated by emission from the gas stream/accretion disc impact region, without comparable emission from the secondary star. This has implications for the interpretation of Bowen blend Doppler tomograms of other LMXBs for which the ephemeris may not be accurately known.Comment: 11 pages, 10 figures, 4 tables; Accepted for publication in MNRA

A framework for conceptualising early intervention for eating disorders

OBJECTIVE: This paper outlines the evidence base for early intervention for eating disorders; provides a global overview of how early intervention for eating disorders is provided in different regions and settings; and proposes policy, service, clinician and research recommendations to progress early intervention for eating disorders. METHOD AND RESULTS: Currently, access to eating disorder treatment often takes many years or does not occur at all. This is despite neurobiological, clinical and socioeconomic evidence showing that early intervention may improve outcomes and facilitate full sustained recovery from an eating disorder. There is also considerable variation worldwide in how eating disorder care is provided, with marked inequalities in treatment provision. Despite these barriers, there are existing evidence-based approaches to early intervention for eating disorders and progress is being made in scaling these. CONCLUSIONS: We propose action steps for the field that will transform eating disorder service provision and facilitate early detection, treatment and recovery for everyone affected by eating disorders, regardless of age, socioeconomic status and personal characteristics