High-Contrast 3.8 Micron Imaging Of The Brown Dwarf/Planet-Mass Companion to GJ 758

We present L' band (3.8 $\mu m$) MMT/Clio high-contrast imaging data for the nearby star GJ 758, which was recently reported by Thalmann et al. (2009) to have one -- possibly two-- faint comoving companions (GJ 758B and ``C", respectively). GJ 758B is detected in two distinct datasets. Additionally, we report a \textit{possible} detection of the object identified by Thalmann et al as ``GJ 758C" in our more sensitive dataset, though it is likely a residual speckle. However, if it is the same object as that reported by Thalmann et al. it cannot be a companion in a bound orbit. GJ 758B has a H-L' color redder than nearly all known L--T8 dwarfs. Based on comparisons with the COND evolutionary models, GJ 758B has T$_{e}$ $\sim$ 560 K$^{^{+150 K}_{-90K}}$ and a mass ranging from $\sim$ 10--20 M$_{J}$ if it is $\sim$ 1 Gyr old to $\sim$ 25--40 M$_{J}$ if it is 8.7 Gyr old. GJ 758B is likely in a highly eccentric orbit, e $\sim$ 0.73$^{^{+0.12}_{-0.21}}$, with a semimajor axis of $\sim$ 44 AU$^{^{+32 AU}_{-14 AU}}$. Though GJ 758B is sometimes discussed within the context of exoplanet direct imaging, its mass is likely greater than the deuterium-burning limit and its formation may resemble that of binary stars rather than that of jovian-mass planets.Comment: 14 pages, 3 figures. Accepted for publication in The Astrophysical Journal Letter

Rural transformations, rural futures : introduction to theme section

Open Access via the T&F Agreement Acknowledgements The co-editors of the theme section wish to thank all those who contributed work to this collection of papers, many of whom contributed as peer reviewers, providing supportive and constructive feedback. We also record our thanks to the Scottish Geographical Journal’s editor in chief, Chris Philo, for his support for this project and meticulous editorial oversight of all contributions to the theme sectionPeer reviewe

Institutional Complexity and Individual Responses: Delineating the Boundaries of Partial Autonomy

Research highlights how coexisting institutional logics can sometimes offer opportunities for agency to enterprising actors in organizational fields. But macro- and micro-level studies using this framework diverge in their approach to understanding the consequences of institutional complexity for actor autonomy, and correspondingly in the opportunities they identify for agents to resist, reinterpret or make judicious use of institutional prescriptions. This paper seeks to bridge this gap, through a longitudinal, comparative case study of the trajectories of four ostensibly similar change initiatives in the same complex organizational field. It studies the influence of three dominant institutional logics (professional, market and corporate) in these divergent trajectories, elucidating the role of mediating influences, operating below the level of the field but above that of the actor, that worked to constrain or facilitate agency. The consequence for actors was a divergent realization of the relationship between the three logics, with very different consequences for their ability to advance their interests. Our findings offer an improved understanding of when and how institutional complexity facilitates autonomy, and suggests mediating influences at the level of the organization and the relationship it instantiates between carriers of logics, neglected by macro- and micro-level studies, that merit further attention

Uncovering attributes of an internal Islands Diaspora : Connections and Aspirations to Return

This research was conducted as part of a PhD research project funded by Macaulay Development TrustPeer reviewe

Gow’s Typology of Scotland’s Islands : Technical notes

Publisher PD

Thermal Performance through Heat Retention in Integrated Collector-Storage Solar Water Heaters: A Review

Solar thermal systems are a long-standing technology that is receiving increased attention, in terms of research and development, due to ambitious climate change targets and the need for renewable energy solutions. Integrated collector-storage solar water heaters (ICSSWHs) are a potential contributing solution and numerous studies have focussed on the optimisation of their thermal performance and efficiency. A major drawback of these systems is the heavy heat losses experienced during non-collection periods. To combat this, various heat retention strategies have been proposed and evaluated, including baffles plates, additional insulation, multiple glazing layers, selective coatings, and phase change materials. This paper aims to bring together these studies through a systematic review of the existing literature surrounding the performance of ICSSWH systems, focusing on heat retention. This review provides a comprehensive and up-to-date point of reference on relevant research and developments for researchers in this field

Dysregulation of glucocorticoid metabolism in murine obesity: comparable effects of leptin resistance and deficiency

In obese humans, metabolism of glucocorticoids by 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) and A-ring reduction (by 5α- and 5β-reductases) is dysregulated in a tissue specific manner. These changes have been recapitulated in leptin resistant obese Zucker rats but were not observed in high-fat fed Wistar rats. Recent data from mouse models suggest that such discrepancies may reflect differences in leptin signalling. We therefore compared glucocorticoid metabolism in murine models of leptin deficiency and resistance. Male ob/ob and db/db mice and their respective littermate controls (n=10–12/group) were studied at the age of 12 weeks. Enzyme activities and mRNA expression were quantified in snap-frozen tissues. The patterns of altered pathways of steroid metabolism in obesity were similar in ob/ob and db/db mice. In liver, 5β-reductase activity and mRNA were increased and 11β-HSD1 decreased in obese mice, whereas 5α-reductase 1 (5αR1) mRNA was not altered. In visceral adipose depots, 5β-reductase was not expressed, 11β-HSD1 activity was increased and 5αR1 mRNA was not altered in obesity. By contrast, in subcutaneous adipose tissue 11β-HSD1 and 5αR1 mRNA were decreased. Systematic differences were not found between ob/ob and db/db murine models of obesity, suggesting that variations in leptin signalling through the short splice variant of the Ob receptor do not contribute to dysregulation of glucocorticoid metabolism

Singing for Health in Morecambe: 2019

The International Centre for Community Music (ICCM) was invited to respond to an existing brief that sought to understand how two new singing groups were developing. This was part of a pilot project established to connect with older people experiencing isolation, and, young people who were connected with the Children and Adolescent Mental Health Service (CAMHS). These singing groups were set up in partnership with a local GP practice and a local CAHMS team to explore possible arts partnerships as a way to challenge health inequalities relating to mental health experiences in Morecambe

Health Inequities and Moral Distress Among Community Health Nurses During the COVID-19 Pandemic

     The core values of community health nursing practice are rooted in the social determinants of health, health equity and social justice.  Throughout the COVID-19 pandemic, community health nurses (CHNs) witnessed first-hand the impact on individuals in situations of marginalization. This research inquiry explored how health inequities among client populations contributed to experiences of MD among CHNs in Canada during the pandemic.      A total of 245 CHNs from across Canada participated in an online survey. Participants reported that during the pandemic individuals living in situations of marginalization were disproportionately impacted. CHNs were unable to provide the necessary health promotion interventions and experienced high levels of moral distress. The negative impact of the pandemic on individuals living in situations of marginalization illuminated the intersecting social and structural inequities that drive negative health outcomes and emphasized the need to adopt an equity focus for current and future pandemic planning, response, and recovery.