Leaf energy balance modelling as a tool to infer habitat preference in the early angiosperms

Despite more than a century of research, some key aspects of habitat preference and ecology of the earliest angiosperms remain poorly constrained. Proposed growth ecology has varied from opportunistic weedy species growing in full sun to slow-growing species limited to the shaded understorey of gymnosperm forests. Evidence suggests that the earliest angiosperms possessed low transpiration rates: gas exchange rates for extant basal angiosperms are low, as are the reconstructed gas exchange rates for the oldest known angiosperm leaf fossils. Leaves with low transpirational capacity are vulnerable to overheating in full sun, favouring the hypothesis that early angiosperms were limited to the shaded understorey. Here, modelled leaf temperatures are used to examine the thermal tolerance of some of the earliest angiosperms. Our results indicate that small leaf size could have mitigated the low transpirational cooling capacity of many early angiosperms, enabling many species to survive in full sun. We propose that during the earliest phases of the angiosperm leaf record, angiosperms may not have been limited to the understorey, and that some species were able to compete with ferns and gymnosperms in both shaded and sunny habitats, especially in the absence of competition from more rapidly growing and transpiring advanced lineages of angiosperms

Entropies of weakly adsorbed molecules beyond the harmonic approximation

Adsorption processes and reaction kinetics are described by the free energy. While the enthalpy contribution to the free energy can be evaluated with reasonable accuracy thanks to the developments of density functional theory (DFT), methods to accurately describe the entropy contributions are in many cases missing. One important example is adsorption in zeolites where some adsorbates are physisorbed, which is a state where the common harmonic approximation, as well as more sophisticated methods, can not accurately describe the entropy. Zeolites are crystalline microporous materials and have many applications, for example as catalysts. An important catalytic reaction over a zeolite material is selective catalytic reduction of NOx with ammonia as reducing agent (NH3-SCR). In this thesis, the entropy of species related to the NH3-SCR reaction is explored using two different methods, namely Complete Potential Energy Sampling (CPES) and Thermodynamic Integration (TI). Both methods rely on potential energy surfaces that are obtained with DFT calculations. In CPES, the full multidimensional potential energy surface is sampled by, for example, metadynamics. In TI, the starting point is the harmonic reference system to which calculates anharmonic corrections to the free energy are evaluated. Successful implementation of each method was demonstrated by reproducing results from previous works. When applicable, entropies were compared to experimental data, where only CPES showed to be in good agreement. However, free energy is the primary result of TI and our results are in good agreement with experimental data for the free energy and it is uncertain whether the entropy extraction, underlying method, or simulation setup is the culprit of TI. The results presented in the thesis increase the general understanding of entropies of weakly adsorbed molecules and, in particular, the understanding of entropy changes along the NH3-SCR reaction

RESILIENT AF: UNDERSTANDING THE LIVED EXPERIENCES OF WOMEN OF COLOR PSYCHOLOGISTS IN FORENSIC MENTAL HEALTH SETTINGS

This study explored the lived experiences of women of color psychologists who identify as ethnic-racial minorities. This qualitative study used interpretative phenomenological analysis (IPA) to understand the narrative experience of the participants from their perspective. A total of four participants took part in this study. All participants identified as cisgender women psychologists currently working in a forensic mental health setting and identified as an ethnic-racial minority. In the lived experiences of the participants, three themes, and several subthemes, emerged: challenges, self-preservation, and strengths / resilience. The results showed that women of color psychologists working within forensic mental health settings face continuous adverse challenges, such as cultural prejudice, lack of representation, and vicarious trauma. Further, this study explored the shared and nuanced self-preservation strategies of women of color psychologists to mitigate the negative consequences of vicarious trauma and pervasive discrimination, to preserve their overall health and sense of self. The findings of this study additionally demonstrated the resilience and strengths of women of color psychologists, and their ability to leverage their own adverse challenges to inform their clinical work. These interactions demonstrated the critical role of highlighting women of color psychologists’ strengths and resilience, as it pertains to the prevention of burnout and preserving overall well-being, navigating adverse experiences, and deepening their clinical work to be more culturally responsive and relational

Foodways in transition: food plants, diet and local perceptions of change in a Costa Rican Ngäbe community

Background Indigenous populations are undergoing rapid ethnobiological, nutritional and socioeconomic transitions while being increasingly integrated into modernizing societies. To better understand the dynamics of these transitions, this article aims to characterize the cultural domain of food plants and analyze its relation with current day diets, and the local perceptions of changes given amongst the Ngäbe people of Southern Conte-Burica, Costa Rica, as production of food plants by its residents is hypothesized to be drastically in recession with an decreased local production in the area and new conservation and development paradigms being implemented. Methods Extensive freelisting, interviews and workshops were used to collect the data from 72 participants on their knowledge of food plants, their current dietary practices and their perceptions of change in local foodways, while cultural domain analysis, descriptive statistical analyses and development of fundamental explanatory themes were employed to analyze the data. Results Results show a food plants domain composed of 140 species, of which 85 % grow in the area, with a medium level of cultural consensus, and some age-based variation. Although many plants still grow in the area, in many key species a decrease on local production–even abandonment–was found, with much reduced cultivation areas. Yet, the domain appears to be largely theoretical, with little evidence of use; and the diet today is predominantly dependent on foods bought from the store (more than 50 % of basic ingredients), many of which were not salient or not even recognized as ‘food plants’ in freelists exercises. While changes in the importance of food plants were largely deemed a result of changes in cultural preferences for store bought processed food stuffs and changing values associated with farming and being food self-sufficient, Ngäbe were also aware of how changing household livelihood activities, and the subsequent loss of knowledge and use of food plants, were in fact being driven by changes in social and political policies, despite increases in forest cover and biodiversity. Conclusions Ngäbe foodways are changing in different and somewhat disconnected ways: knowledge of food plants is varied, reflecting most relevant changes in dietary practices such as lower cultivation areas and greater dependence on food from stores by all families. We attribute dietary shifts to socioeconomic and political changes in recent decades, in particular to a reduction of local production of food, new economic structures and agents related to the State and globalization

Emotional blunting in patients with depression. Part IV: differences between patient and physician perceptions

Background Emotional blunting is common in patients with depression. An online survey was undertaken to assess the experience of emotional blunting, and its impact on functioning and quality of life, in the acute and remission phases of depression from the perspective of patients and healthcare providers (HCPs). This paper presents data on the level of concordance between patient and HCP perspectives. Methods This was a cross-sectional, observational study. Patient respondents were adults with a diagnosis of depression, who were currently using a prescribed antidepressant, and who reported emotional blunting during the past 6 weeks. HCPs completed the survey for the last two eligible patients they had seen, one in each phase of depression. Assessments included the Oxford Depression Questionnaire (ODQ) 'antidepressant as cause' domain and the Functioning Assessment Short Test (FAST). Results Mean ODQ 'antidepressant as cause' domain scores were significantly higher in the patient-reported cohort (n = 752) than in the HCP-assessed cohort (n = 766) in both the acute (18.0 vs 12.5, respectively; p < 0.01) and remission phases (17.6 vs 12.6; p < 0.01). Overall, 45% of patients believed that their antidepressant medication was negatively affecting their emotions and 39% were considering stopping or had stopped their antidepressant because of perceived emotion-related side effects. In the HCP-assessed cohort, the antidepressant was considered responsible for emotional blunting in 30% of patients and only 18% of patients were believed to be considering stopping their medication due to emotional blunting. Patients reported a greater impact of emotional blunting on activities of daily living than HCPs. Mean FAST score was significantly higher in each phase of depression in the patient-reported cohort than in the HCP-assessed cohort (acute phase, 47.0 vs 39.1; remission phase, 33.5 vs 19.4; both p < 0.01). Conclusions Compared with previous studies, our results suggest that HCPs may underestimate the prevalence of emotional blunting in patients with depression. HCPs also appear to underestimate the severity and impact of emotional blunting on patient functioning and treatment adherence compared with patients' own perspectives. Differences between patient and HCP perspectives were most pronounced during the acute phase of the disease

Taxonomic surrogacy in biodiversity assessments, and the meaning of Linnaean ranks

Copyright © 2006 The Natural History MuseumThe majority of biodiversity assessments use species as the base unit. Recently, a series of studies have suggested replacing numbers of species with higher ranked taxa (genera, families, etc.); a method known as taxonomic surrogacy that has an important potential to save time and resources in assesments of biological diversity. We examine the relationships between taxa and ranks, and suggest that species/higher taxon exchanges are founded on misconceptions about the properties of Linnaean classification. Rank allocations in current classifications constitute a heterogeneous mixture of various historical and contemporary views. Even if all taxa were monophyletic, those referred to the same rank would simply denote separate clades without further equivalence. We conclude that they are no more comparable than any other, non-nested taxa, such as, for example, the genus Rattus and the phylum Arthropoda, and that taxonomic surrogacy lacks justification. These problems are also illustrated with data of polychaetous annelid worms from a broad-scale study of benthic biodiversity and species distributions in the Irish Sea. A recent consensus phylogeny for polychaetes is used to provide three different family-level classifications of polychaetes. We use families as a surrogate for species, and present Shannon–Wiener diversity indices for the different sites and the three different classifications, showing how the diversity measures rely on subjective rank allocations.Y. Bertrand, F. Pleijel and G. W. Rous