Acadian transpression and the exhumation of the sillimanite-bearing Passagassawakeag terrane along the Liberty-Orrington Fault, coastal Maine

New detailed mapping in central coastal Maine shows the existence of a dextral strike-slip myIonitic shear zone, 250-500m thick, separating the sillimanite-grade Passagassawakeag terrane and the chlorite-grade Bucksport Formation of the Fredericton Trough. Foliation within the shear zone is near-vertical, with near-horizontal stretching lineations and pervasive dextral sense-of-shear indicators. Followed eastward, this northeast-striking terrane boundary turns north. A thin unit of alternating layers of quartz and gamet + biotite + magnetite, previously interpreted as the stratigraphic Rider Bluff unit, lies along this north-south striking (eastern) part of the Passagassawakeag-Bucksport boundary. Petrographic analysis demonstrates that the layering in this unit is a tectonic fabric, and the entire unit is interpreted as consisting of mytonites formed along a transpressional thrust, now overturned, along which the Passagassawakeag terrane was exhumed. If this is the case, the Liberty-Orrington shear zone may represent part of an orogen-scale dextral shear zone, continuous with the Penobscot Bay and Norumbega fault zones, through the Acadian orogeny. RÉSUMÉ De nouveaux travaux de cartographie déaillés du centre du littoral du Maine révèlént l'existence d'une zone cisaillée mylonitique à décrochement dextre de 250 à 500 metres d'épaisseur séparant le terrane à sillimanite de Passagassawakeag et la Formation à chlorite de Bucksport de la dépression de Fredericton. La zone cisaillée présente une schistosité presque verticale avec des lineations quasi-horizontales qui s'etirent ct des indicaieurs d'une orientation dextre pénétrante du cisaillement. Vers l’est, la limite de ce terrane orienté vers Ie nord-est toume vers le nord. Une unité mince de strates altemantes de quartz et de grenai + biotite + magnetite, auparavant interprétée comme l’uniteé stratigraphique de Rider Bluff, longe cette partie (orientale) à orientation nord-sud de la ligne de démarcation entrc Passagassawakeag et Bucksport. Une analyse pétrogrmphique révèle que la stratification à I'tntérieur de cette unité est de fabrique tectontque; on interprète I'ensemble de I'unité comme une unité constituée de mylonites s'étani formée Ie long d'un chevauchement transprcssionnel. maintenant renversé, le long duqucl Ic terrane de Passagassawakeag a été exhumé. Si c'est bien le cas la zone de cisaillement de Liberty-Orrington pourrait représenter une partic d'une zone de cisaillement dextre orogénique maintenant une continuité avec les zones faillées de la baie de Penobscot et de Norumbega pendant I'orogenese acadienne. Traduit par la rédactio

Olfactory tissue investment in tropical rainforest ants scales with body size.

Differential tissue allocation in animal sensory systems is common and varies with habitat. Worker ants perform a variety of complex tasks that depend on neural capacity, with chemical cues considered central to ant behavior. The antennal (olfactory) lobes of ant brains are often highly developed relative to other insects; however, arboreal ants that live in environments with higher light levels tend to rely more on visual cues than olfaction compared to terrestrial ants. The extent to which habitat-driven behavior affects neural investment in tropical rainforest ants is unknown. Here, I focused on three common tropical ant species (Pseudomyrmex boopis, P. oculatus, and P. gracilis) that nest and forage in different habitats from the ground to the canopy within neotropical rainforests. I tested the hypothesis that relative investment in olfactory neural structures varies interspecifically with habitat association. I predicted that: (1) Canopy-dwelling species have a lower density of sensilla on their antennae and fewer glomeruli associated with olfaction; (2) Canopy-dwelling species have a lower antennal lobe to glomeruli volume ratio; and (3) Antennal sensilla density is correlated with the number of glomeruli among individuals within species. The results did not support these predictions, with the canopy species P. oculatus having the greatest sensilla density relative to its body size and a higher average number of glomeruli. There were no differences in antennal lobe to glomeruli volume ratios among species. Despite a small sample size (n = 5) preliminary results suggest there is a positive relationship between the number of sensilla and the number of glomeruli in these ants. The findings of this study suggest that allometry is critical in determining the relative number of sensilla and glomeruli and that size differences do not restrict investment in necessary olfactory structures across the three species

The geology of the Liberty-Orrington-Passagassawakeag/Fredericton Trough terrane boundary in the Bucksport-Orland area, coastal Maine

The Liberty-Orrington fault separates two tectonic terranes of widely different lithologies and metamorphic grades within the Coastal Lithotectonic Belt of Maine. While the juxtaposition of the sillimanite-bearing Passagassawakeag gneiss and the chlorite grade Bucksport Formation (turbidites) requires a fault between them, field evidence for, and an understanding of, the nature of the fault has hitherto been lacking. Although the Liberty-Orrington fault has previously been interpreted as a thrust, strike-slip, and/or normal fault, the most recent debate has been centered around two models of Acadian amalgamation involving thrusting of the Passagassawakeag terrane from the southeast vs. thrusting from beneath central Maine (from the northwest) (Osberg et al., 1998; Stewart et al., 1995). My detailed mapping shows the existence of a 250-500m wide mylonitic shear zone separating the gneiss and the turbidites in the southern portion of the study area. Foliation within the shear zone is predominately near-vertical, with near-horizontal stretching lineations and pervasive dextral (present orientation) sense-of-shear indicators. The mylonites are deformed by open Acadian folds on both map and outcrop scales, and are cut by Devonian (371 Ma) granite. Followed eastward, this northeast-striking Passagassawakeag-Bucksport terrane boundary turns north, as do highly-strained rocks and local foliation. A thin unit of alternating layers of quartz and garnet+biotite+magnetite, previously interpreted as a stratigraphic unit showing possible original bedding (Rider Bluff unit), lies along the north-south striking part of the Passagassawakeag-Bucksport boundary. Thin sections demonstrate that the layering in this unit is a tectonic fabric. The field data suggest that the Liberty-Orrington fault is a major dextral strike-slip shear zone, with the eastern boundary as a transpressional thrust; if this is the case, the Liberty-Orrington shear zone may represent a continuum of orogen-scale dextral shear (with the Penobscot Bay and Norumbega fault zones) through the Acadian. This tectonic model is more likely than that of a folded shear zone generated by a thrust, as the sense-of-shear in the unfolded mylonites would require large-scale thrusting parallel to the orogen: This study necessitates a re-evaluation of the role of transpression in the exhumation of high-grade rocks in coastal Maine during the Acadian orogeny

Modeling the near-UV band of GK stars, Paper II: NLTE models

We present a grid of atmospheric models and synthetic spectral energy distributions (SEDs) for late-type dwarfs and giants of solar and 1/3 solar metallicity with many opacity sources computed in self-consistent Non-Local Thermodynamic Equilibrium (NLTE), and compare them to the LTE grid of Short & Hauschildt (2010) (Paper I). We describe, for the first time, how the NLTE treatment affects the thermal equilibrium of the atmospheric structure (T(tau) relation) and the SED as a finely sampled function of Teff, log g, and [A/H] among solar metallicity and mildly metal poor red giants. We compare the computed SEDs to the library of observed spectrophotometry described in Paper I across the entire visible band, and in the blue and red regions of the spectrum separately. We find that for the giants of both metallicities, the NLTE models yield best fit Teff values that are ~30 to 90 K lower than those provided by LTE models, while providing greater consistency between \log g values, and, for Arcturus, Teff values, fitted separately to the blue and red spectral regions. There is marginal evidence that NLTE models give more consistent best fit Teff values between the red and blue bands for earlier spectral classes among the solar metallicity GK giants than they do for the later classes, but no model fits the blue band spectrum well for any class. For the two dwarf spectral classes that we are able to study, the effect of NLTE on derived parameters is less significant.Comment: Submitted to The Astrophysical Journal. Observed spectrophotometric library, and grids of NLTE and LTE) synthetic spectra for GK stars available at http://www.ap.smu.ca/~ishort/PHOENI

Exploring the Impact of Service Learning in Haiti on the Cultural Competence of OTD Students

As society trends towards increased cultural diversity, the need for cultural competence in the field of occupational therapy (OT) becomes more acute. Immersion in another culture within the curriculum offers the student an opportunity to put their knowledge into practice and recognize the need to competently interact with members of another culture. This study explored the impact of a service learning trip to Haiti, providing seating and mobility services, on all four factors of cultural intelligence (CQ; i.e., metacognitive CQ, cognitive CQ, motivational CQ, behavioral CQ) for occupational therapy doctoral (OTD) students. Using the cultural intelligence scale (CQS), a one-group pretest-posttest design with a paired-samples t-test (α \u3c 0.05) rejected the null hypotheses to support service learning as a pedagogy which enhanced the four factors of CQ for the sample. With increased emphasis on producing culturally sensitive OTD professionals, service learning projects in a cross-cultural setting as a pedagogy extend beyond skill development (e.g., wheelchair fittings) to building coping strategies for interacting with clients (metacognitive CQ), enhancing knowledge of culture (cognitive CQ), persisting to overcome any cultural barriers (motivational CQ), and building the behavioral repertoire (behavioral CQ) of occupational therapists. Contrasting the results from this study with research into the efficacy of short-term study tours, service learning positively impacts behavioral CQ, whereas short-term study tours do not have the same impact. This article details the service learning project and provides recommendations for future research

Cross-Cultural Service Learning as Pedagogy for Character Development in Occupational Therapy Doctoral Students

Occupational therapists must demonstrate a broad spectrum of knowledge, clinical reasoning skills, and professionalism to be effective practitioners. Development of ethical practice must begin with the educational process to shape character traits as building blocks of moral reasoning. This article puts forth a cross-cultural service learning curricular module as lived experience for development of character traits in occupational therapy students. This mixed methods study investigated lived experience in the form of cross-cultural service learning as a pedagogy for development of character traits, as measured by the CIVIC, necessary to navigate professional ethical standards. Findings suggest a cross-cultural lived experience for occupational therapy doctoral students providing seating and mobility services in Guatemala significantly impacted character traits associated with professional ethical standards. Similar lived experience embedded in an occupational therapy curriculum may contribute to character development to guide ethical practice for the next generation of occupational therapists

Combating Nursing Burnout: A Quality Improvement Project

Nursing burnout costs the health care industry roughly 14 billion dollars a year. The COVID-19 pandemic has drastically increased burnout rates. Many nurses feel overworked and underappreciated; this has caused a negative impact as it is influencing the rates of burnout among hospital staffing globally. Over half a million registered nurses have already left their profession nationwide due to stress and workload (Bruyneel, Smith, Tack, & Pirson, 2021). Burnout has diminished staff, depleted resources, and decreased quality of care.https://scholarworks.moreheadstate.edu/celebration_posters_2022/1044/thumbnail.jp