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Background: The Doctor of Nursing Practice (DNP) degree prepares nurses for engagement in practice scholarship to improve health outcomes at multiple system levels. Organizational leaders' and employers' perceptions and expectations of DNP-prepared nurses require further study. Objective: To explore the perception of organizational leaders regarding expectations and engagement of DNP-prepared nurses in practice scholarship activities. Methods: Guided by the Actualized DNP Model, a cross-sectional design was used to survey organizational leaders (N = 87) regarding DNP-prepared nurses' engagement in practice scholarship. Results: Findings indicate that 92% (n = 80) of participants believed practice scholarship should be an expectation of DNP-prepared nurses serving in a variety of roles. Of the 77 respondents to the scholarship engagement questions, 97.4% (n = 75) reported that DNP-prepared nurses engaged in one or more practice scholarship activities over the past year. Conclusions: Aligning DNP practice scholarship competencies, as outlined in the American Association of Colleges of Nursing 2021 Essentials, with organizational needs, expectations, and provision of sufficient time to support these scholarship activities is needed. Implications for Nursing: Opportunities exist for DNP-prepared nurses to articulate and demonstrate their value by conducting practice scholarship through innovative advanced nursing roles to realize organizational goals. Organizational support is necessary for practice scholarship activities to transform DNP education. [ABSTRACT FROM AUTHOR]

Models of planetary core formation beginning with melting of Fe,Ni metal and troilite are not readily applicable to oxidized and sulfur‐rich chondrites containing only trace quantities of metal. Cores formed in these bodies must be dominated by sulfides. Siderophile trace elements used to model metallic core formation could be used to model oxidized, sulfide‐dominated core formation and identify related meteorites if their trace element systematics can be quantified. Insufficient information exists regarding the behavior of these core‐forming elements among sulfides during metamorphism prior to anatexis. Major, minor, and trace element concentrations of sulfides are reported in this study for petrologic type 3–6 R chondrite materials. Sulfide‐dominated core‐forming components in such oxidized chondrites (ƒO2 ≥ iron‐wüstite) follow metamorphic evolutionary pathways that are distinct from reduced, metal‐bearing counterparts. Most siderophile trace elements partition into pentlandite at approximately 10× chondritic abundances, but Pt, W, Mo, Ga, and Ge are depleted by 1–2 orders of magnitude relative to siderophile elements with similar volatilities. The distribution of siderophile elements is further altered during hydrothermal alteration as pyrrhotite oxidizes to form magnetite. Oxidized, sulfide‐dominated core formation differs from metallic core formation models both physically and geochemically. Incongruent melting of pentlandite at 865°C generates melts capable of migrating along solid silicate grains, which can segregate to form a Ni,S‐rich core at lower temperatures compared to reduced differentiated parent bodies and with distinct siderophile interelement proportions. [ABSTRACT FROM AUTHOR]

Background: Competency attainment is foremost in the ethos of this project that provides a practical guide to implementing entrustable professional activities (EPAs) as one approach to competency acquisition in the clinical education component of a health care program. EPAs are units of work that provide evidence of required competencies for the clinical education component of a program of study for educators, preceptors, and students. Problem: The American Association of Colleges of Nursing has raised the importance of competency-based education and need for a practical approach to assess clinical competency challenges (eg, EPAs) in nursing education. Approach: The implementation of EPAs in the clinical component of advanced nursing education is detailed as an example in this article. Prioritizing a systematic approach, the Knowledge to Action framework, was chosen to guide the process. Conclusion: Nursing must act now to put in place a robust competency acquisition and validation system. [ABSTRACT FROM AUTHOR]

The Psyche mission's Oxidation-Reduction Working Group is focused on understanding, determining, and applying the redox state of (16) Psyche to understand the origin of a metal-rich world. The oxidation-reduction state of an asteroid, along with its temperature, parent body size, and composition, is a key parameter in determining the history of an asteroid. Determining the redox state from spacecraft data is most easily done by examining potential metal-oxide buffer pairs. The occurrence of Ni, Fe, C, Cr, P and Si, in that order, in the metal or sulfide phase of an asteroidal body indicates increasingly reduced conditions. Key observations by the Imager and Gamma-Ray and Neutron Spectrometer (GRNS) of Psyche can bracket the redox state using metal-oxide buffers. The presence of Fe,Ni metal can be confirmed by the ratios of Fe/O or Fe/Si and the concentration of Ni variability in metal across the asteroid can be determined by GRNS. The FeO concentration of silicates is complementary to the Ni concentration of metal and can be constrained using filters on the Imager. The presence of FeO in silicates from ground-based observations is one of the few measurements we already have of redox state, although available data permit a wide range of silicate compositions and mineralogies. The presence of C, P or Si concentrated in the metallic, Fe-rich portion of the asteroid, as measured by GRNS, or Ca-sulfide, determined by imaging, would indicate increasingly reducing conditions. Linkage to known types of meteorites, whether metal-rich chondrites, stony-irons or irons, expands the mineralogical, chemical and isotopic data not available from remote observations alone. Redox also controls both silicate and metal mineralogy, influencing differentiation, solidification, and subsolidus cooling, including the relative abundance of sulfur in the core and possible magnetic signatures. The redox state of Psyche, if a fully-differentiated metallic core, might constrain the location and timing of both the formation of Psyche and any oxidation it might have experienced. [ABSTRACT FROM AUTHOR]

Background: Nearly 15 years after the introduction of the doctor of nursing practice (DNP) degree, stakeholders anticipate practice scholarship outcomes from graduates. Purpose: To examine the frequency of engagement in practice scholarship, the relationship between the knowledge gained in DNP programs and the frequency of engagement in practice scholarship and the relationship between engagement in practice scholarship, work role, and years since graduation with a DNP degree, as reported by practicing nurses. Methodology: This cross-sectional study recruited 306 practicing DNP graduates via a national organization and employed an electronic survey. Descriptive and inferential statistics, correlational analysis, and a one-way analysis of variance were conducted on demographics and outcome variables for 269 completed surveys. Results: The practice scholarship activity reported most frequently was evaluation of current clinical evidence and least frequently was dissemination of policy papers. Reported knowledge gained from DNP programs and frequency of engagement in practice scholarship indicate a weak positive correlation. There was a significant difference in the direct care work role and practice scholarship engagement compared with other roles, and between those practicing greater than 10 years and those with less experience. Conclusions: Results highlight the underutilization of knowledge gained in DNP programs and engagement in practice scholarship. The study emphasizes the complexity of realizing practice scholarship outcomes of DNP-prepared nurses to influence patients, populations, systems, and policy as well as the advancement of the nursing profession. Implications: This is a call to action for DNP graduates, academia, practice, and the nursing profession to support and value practice scholarship. [ABSTRACT FROM AUTHOR]

Background: The American Association of Colleges of Nursing introduced the Doctor of Nursing Practice (DNP) degree in 2004. To date, few publications examine the competencies and impact of nurses with practice doctorates. Purpose: The purpose of this study was to examine reasons for seeking a DNP degree, assess knowledge and competencies acquired from DNP programs, and to inform stakeholders about the skills acquired by nurses with practice doctorates. Methods: A cross-sectional design was used to administer a self-report survey to a convenience sample of DNP-prepared nurses in practice, recruited from a national membership organization. The electronic survey was designed using constructs developed from the literature, national organization position statements, and standards of doctoral nursing education. Results: A total of 306 participants responded to the survey, 270 were used after data review. The majority of respondents did not seek a DNP degree because it was required for a job, to gain additional supervised practice, or to receive additional training with a specialty population. The majority strongly agreed that they gained competency in translating and synthesizing research evidence into practice, designing and implementing quality improvement, and identifying, measuring, and evaluating outcomes. Conclusions: Primary reasons for seeking a DNP degree were seeking knowledge, skills, competencies, confidence, and job opportunities. Implications for practice: Doctor of Nursing Practice–prepared nurses hold unique, advanced knowledge, competencies and skills to affect health care across multiple settings. Study results suggest that highly skilled DNP-prepared nurses are equipped to lead quality improvement, engage in practice scholarship, and improve clinical outcomes. [ABSTRACT FROM AUTHOR]

Secondary minerals occurring at the faces of fractures, the only reliable visual evidence of the presence of hydraulically conductive fractures in clayey unlithified aquitards, have been characterized for two uncontaminated field sites, Dalmeny, Saskatchewan, and Laidlaw, Ontario. Preliminary identification of secondary minerals and their variations with depth was made using a Munsell™ Color Chart. Subsequent microscopic analyses (petrography, electron microprobe analysis, scanning electron microscopy, and X-ray diffraction) were used to identify iron-oxide mineralogy. Iron oxides were identified as goethite, ferrihydrite, and hematite at Dalmeny, where they occur to depths of 10 to 15 m, and goethite and ferrihydrite at Laidlaw, observed to depths of 7 m. In both cases, the identification of ferrihydrite was tentative due to the problems of small sample size and peak overlap in X-ray diffraction. The iron oxides do not form coatings on the surfaces of the fractures as had been previously thought; rather they form cements linking the matrix grains. Thus there is potential for decreased permeability and increased surface reactivity parallel to and inward from the fracture faces. The pattern of iron-oxide distribution suggests that the youngest deposits, and those with the greatest surface reactivity and potential for contaminant retardation, are found at greatest depths in the fractures. Manganese oxides form in isolated clusters in larger pores and indentations, although the exact manganese minerals could not be firmly identified., Catherine A. Corrigan (1,2), Heather E. Jamieson (1), and Victoria H. Remenda (1,3) Introduction Much of the current research on clay-rich, unlithifled aquitards has been on their increased permeability due [...]

We report on the geochemical analyses of glassy spherules from sediments at three Transantarctic Mountain locations and the discovery of Australasian microtektites at two of these sites. Australasian microtektites are present at Mt. Raymond (RY) in the Grosvenor Mountains and Meteorite Moraine (MM) at Walcott Névé, in the Beardmore Glacier region of Antarctica. The microtektites were identified based on their pale yellow appearance, the high concentrations of silica (SiO2 = 60 ± 7 wt%) and alumina (Al2O3 = 23 ± 4 wt%), and a K2O/Na2O > 1, which are all characteristics of microtektites and distinct from spherules of meteoritic origin. Additionally, trace element patterns for these microtektites match the upper continental crust compositions with enrichments in refractory elements and depletions in volatile elements, most likely as a result of melting and vaporization of source material. The presence of Australasian microtektites in RY sediment confirms the recent Australasian strewn field extension to Antarctica and the presence of highly volatile depleted microtektites. In addition to microtektites, thousands of chondritic spherules and a few unique differentiated cosmic spherules were identified in RY, MM, and Jacobs Nunatak sediments. Two unique spherules were calculated to have Fe/Mn ratios similar to micrometeorites assumed to be derived from Vesta (Fe/Mn 33.2 ± 0.5 atom%) and two other unique spherules are extremely rich in refractory components (Al2O3 ~ 30% and TiO2 = ~2%). The three sites examined are evidently successful cosmic dust and impact debris collectors, and thus are useful traps for recording and examining the nature of influx events. [ABSTRACT FROM AUTHOR]

Aim: To describe the practice doctorate scholarly approach to assess advanced nursing practice in Ireland to address healthcare and nursing policy initiatives. Background: A global team from Ireland and the United States collaborated with stakeholders, using a practice doctorate approach to identify geographic healthcare needs, the current state of the education and the evolving roles of advanced nursing practice. In Ireland, current policy initiatives call for expanding the capacity for advanced nurse practitioners to meet healthcare needs in community settings. Sources of Evidence: Further assessment data were required from stakeholders to inform graduate nursing education to prepare advanced practice nurses to fulfil increasingly complex healthcare needs. The practice doctorate approach included review of literature, current policy and assessment with interviews, dialogue and the development of working relationships with policymakers, academics and practitioners. Discussion: The current state and future vision of graduate nursing education are evolving. A force field analysis identified promoting and restraining factors to the desired state of development of the primary care advanced practice role. Relationship building with stakeholders and sharing of expertise was key to engage academia and policymakers to address identified restraining forces. Short‐term outcomes included development of collaborative relationships between practice, academia and policymakers, curricular development for the primary care nurse practitioner and intentionally shared dissemination to promote community graduate nursing education. Implications for Nursing Practice: This innovative practice scholarship approach was used to assess and promote advanced nursing practice impact and promote the nursing profession globally. Implications for Policy: Successful collaboration between two global partners was achieved to promote policy objectives for both nursing and health care, with the ultimate goal of improving health outcomes and population health. [ABSTRACT FROM AUTHOR]

The Hamburg meteorite fell on January 16, 2018, near Hamburg, Michigan, after a fireball event widely observed in the U.S. Midwest and in Ontario, Canada. Several fragments fell onto frozen surfaces of lakes and, thanks to weather radar data, were recovered days after the fall. The studied rock fragments show no or little signs of terrestrial weathering. Here, we present the initial results from an international consortium study to describe the fall, characterize the meteorite, and probe the collision history of Hamburg. About 1 kg of recovered meteorites was initially reported. Petrology, mineral chemistry, trace element and organic chemistry, and O and Cr isotopic compositions are characteristic of H4 chondrites. Cosmic ray exposure ages based on cosmogenic 3He, 21Ne, and 38Ar are ~12 Ma, and roughly agree with each other. Noble gas data as well as the cosmogenic 10Be concentration point to a small 40–60 cm diameter meteoroid. An 40Ar‐39Ar age of 4532 ± 24 Ma indicates no major impact event occurring later in its evolutionary history, consistent with data of other H4 chondrites. Microanalyses of phosphates with LA‐ICPMS give an average Pb‐Pb age of 4549 ± 36 Ma. This is in good agreement with the average SIMS Pb‐Pb phosphate age of 4535.3 ± 9.5 Ma and U‐Pb Concordia age of 4535 ± 10 Ma. The weighted average age of 4541.6 ± 9.5 Ma reflects the metamorphic phosphate crystallization age after parent body formation in the early solar system. [ABSTRACT FROM AUTHOR]

Petrogenetic relationships among members of the brachinite family were established by analyzing major and trace element concentrations of minerals for 9 representative specimens: Al Huwaysah 010, Eagles Nest, Northwest Africa (NWA) 4882, NWA 5363, NWA 7297, NWA 7299, NWA 11756, Ramlat as Sahmah (RaS) 309, and Reid 013. The brachinite family, which includes brachinites and ungrouped achondrites with compositional and isotopic similarities to brachinites, comprises FeO‐rich, olivine‐dominated achondrites whose compositional and mineralogic variability is correlated with oxidation state. Most classical brachinites are derived from precursors that were more oxidized and sulfur‐rich than those of ungrouped "brachinite‐like" achondrites. This is manifest in the distinct Fe‐Ni‐S systems among brachinite family precursors, which were sulfide‐dominated for the most oxidized brachinites and metal‐dominated for the least oxidized brachinite‐like achondrites. Consequently, highly siderophile element behavior was controlled through melting and removal of their dominant host phase in the precursor, which was likely pentlandite in sulfide‐dominated systems and kamacite/taenite in metal‐dominated systems. Anomalous Ir/Os and Pt/Os ratios of oxidized brachinites may be attributed to selective complexing during melting of As‐rich pentlandite, consistent with our observations of impact‐melted sulfides in R chondrite NWA 11304, although further experimental work is needed to model this process. The apparent redox trend among the brachinite family is consistent with silicate FeO content and Fe/Mn ratios, which may be used as a proxy for determining the relative oxidation state of brachinite family members. Based on our analyses, we make several recommendations for reclassification of samples into a continuum of oxidized to reduced endmembers for the brachinite family. Along with a common range of Δ17O, this evidence is consistent with either formation on a common heterogeneous parent body, or at least from the same nebular reservoir, with variable O and S fugacities, resulting in mineralogically distinct igneous products for oxidized and reduced endmembers. Sulfur‐bearing, oxidized differentiation may extend to other bodies that formed at or beyond the snow line in the early solar system, and should be considered when interpreting observational data for asteroids in upcoming missions. [ABSTRACT FROM AUTHOR]

We investigated the metal‐rich chondrite Sierra Gorda (SG) 009, a member of the new G chondrite grouplet (also including NWA 5492, GRO 95551). G chondrites contain 23% metal, very reduced silicates, and rare oxidized mineral phases (Mg‐chromite, FeO‐rich pyroxene). G chondrites are not related to CH‐CB chondrites, based on bulk O, C, and N isotopic compositions, mineralogy, and geochemistry. G chondrites have no fine‐grained matrix or matrix lumps enclosing hydrated material typical for CH‐CB chondrites. G chondrites' average metal compositions are similar to H chondrites. Siderophile and lithophile geochemistry indicates sulfidization and fractionation of the SG 009 metal and silicates, unlike NWA 5492 and GRO 95551. The G chondrites have average O isotopic compositions Δ17O>0‰ ranging between bulk enstatite (E) and ordinary (O) chondrites. An Al‐rich chondrule from SG 009 has Δ17O>0‰ indicating some heterogeneity in oxygen isotopic composition of G chondrite components. SG 009's bulk carbon and nitrogen isotopic compositions correspond to E and O chondrites. Neon isotopic composition reflects a mixture of cosmogenic and solar components, and cosmic ray exposure age of SG 009 is typical for O, E, and R chondrites. G chondrites are closely related to O, E, and R chondrites and may represent a unique metal‐rich parent asteroid containing primitive and fractionated material from the inner solar system. Oxidizing and reducing conditions during SG 009 formation may be connected with a chemical microenvironment and possibly could indicate that G chondrites may have formed by a planetesimal collision resulting in the lack of matrix. [ABSTRACT FROM AUTHOR]

Qarabawi's Camel Charm was acquired from Abdullah Qarabawi of the Ababda tribe of eastern Egypt. The charm consists of a chain with four links and an ~6.5 cm diameter flattened disk with the Arabic inscription "Allahu Akbar," which translates as "God is Greatest." Belief in the evil eye is prevalent among the Ababda, even to the modern day, and as men identify camels and the cultural objects and activities related to them as one of their most important possessions, charms and amulets are often used to ward off its influence. Nondestructive analyses of the disk and metallographic examination of the distal link reveal a deformed medium octahedral pattern, confirming the meteoritic origin of the Camel Charm. Major, minor, and trace element compositions are consistent with classification as a IIIAB iron. Combined heating to modest temperatures (~600 °C) and cold working were used in the manufacture of the Camel Charm. Although compositionally similar to the Wabar IIIAB irons, chemical differences, the significant distance between Wabar and eastern Egypt, and the lack of established trade routes suggest that the Camel Charm source material was a meteorite unknown as an unworked specimen. This meteorite has been given the name Wadi El Gamal, the name of a National Park in the Ababda homelands. [ABSTRACT FROM AUTHOR]

Enstatite meteorites, both aubrites and enstatite chondrites, formed under exceptionally reducing conditions, similar to the planet Mercury. Despite being reduced, the MESSENGER mission showed that the surface of Mercury is more enriched in volatiles (e.g., S, Na, K, Cl) than previously thought. To better understand the mineral hosts of these volatiles and how they formed, this work examines the chemistry and petrographic settings of a rare, K‐bearing sulfide called djerfisherite within enstatite chondrites and aubrites. The petrographic settings of djerfisherite within aubrites suggest this critical host of Cl formed after both the crystallization of troilite and exsolution of daubréelite. Djerfisherite is commonly observed as a rim on other sulfides and in contact with metal. We present an alteration model for djerfisherite formation in aubrite meteorites, whereby troilite and Fe‐Ni metal are altered through anhydrous, alkali‐ and Cl‐rich fluid metasomatism on the aubrite parent body to produce secondary djerfisherite. Moreover, we observe a loss of volatiles in djerfisherite within impact melted regions of the Miller Range 07139 EH3 chondrite and the Bishopville aubrite and explore the potential for impact devolatilization changes to sulfide chemistry on other reduced bodies in the Solar System. Vapor or fluid phase interactions are likely important in the formation of volatile‐rich phases in reduced systems. While most Na and K on the mercurian surface is expected to be hosted in feldspar, djerfisherite is likely a minor, but critical, reservoir for K, Na, and Cl. Djerfisherite present on reduced bodies, such as Mercury, may represent sulfides formed via late‐stage, primary metasomatism. [ABSTRACT FROM AUTHOR]

Mason would later recount his first sighting of an Allende stone in the window of the local newspaper office, with one look sufficient to convince him of the remarkable nature of the meteorite. Gene Jarosewich spearheaded preparation of the Allende Meteorite Reference Sample (Jarosewich et al. 1987) by powdering ~4 kg of Allende and preparing more than 700 splits. A 15 kg stone fell within 4 m of a house in Pueblito de Allende, Mexico, the village which would lend its name to one of the most significant meteorite falls of all time. [Extracted from the article]

The Institute of Medicine and the American Association of Colleges of Nursing advise that professional nursing education include development of a high level of cultural competency . A 10-day learning experience to Ireland for nursing students at the University of Detroit Mercy, an independent Catholic university, sponsored by the Sisters of Mercy and the Society of Jesus (Jesuit Fathers), helped them develop a philosophy of Mercy care and build cultural competence. Learning focused on the life of Catherine McAuley, Irish culture, spirituality, social justice, relective thinking, and a value-centered professional education. [ABSTRACT FROM AUTHOR]

Volatile-rich and typically oxidized carbonaceous chondrites, such as CV and CM chondrites, potentially respond to impacts differently than do other chondritic materials. Understanding impact melting of carbonaceous chondrites has been hampered by the dearth of recognized impact melt samples. In this study we identify five carbonaceous chondrite impact melt clasts in three host meteorites: a CV3 red chondrite, a CV3 oxA chondrite, and a regolithic howardite. The impact melt clasts in these meteorites respectively formed from CV3 red chondrite, CV3 oxA chondrite, and CM chondrite protoliths. We identified these impact melt clasts and interpreted their precursors based on their texture, mineral chemistry, silicate bulk elemental composition, and in the case of the CM chondrite impact melt clast, in situ measurement of oxygen three-isotope signatures in olivine. These impact melts typically contain euhedral–subhedral olivine microphenocrysts, sometimes with relict cores, in glassy groundmasses. Based on petrography and Raman spectroscopy, four of the impact melt clasts exhibit evidence for volatile loss: these melt clasts either contain vesicles or are depleted in H 2 O relative to their precursors. Volatile loss (i.e., H 2 O) may have reduced the redox state of the CM chondrite impact melt clast. The clasts that formed from the more oxidized precursors (CV3 oxA and CM chondrites) exhibit phase and bulk silicate elemental compositions consistent with higher intrinsic oxygen fugacities relative to the clast that formed from a more reduced precursor (CV3 red chondrite). The mineral chemistries and assemblages of the CV and CM chondrite impact melt clasts identified here provide a template for recognizing carbonaceous chondrite impact melts on the surfaces of asteroids. [ABSTRACT FROM AUTHOR]

A method was developed for the extraction and analysis of cow's milk to measure 21 halogenated flame retardants (FRs), including individual isomers plus eight methoxy-polybrominated diphenyl ethers (MeO-PBDEs). Extraction was performed using homogenisation with acetone: hexane with size exclusion chromatography followed by adsorption chromatography clean-up. Analysis was undertaken using gas chromatography high-resolution mass spectrometry. The method was validated in fortified cow's milk with FRs and 2-methoxy-PBDE 68 at three levels (low [12.5-1250 pg g-1], mid [37.5-5000 pg g-1] and high [400-10 000 pg g-1]). Additional methoxy-PBDEs were tested at two fortification levels. Isotope dilution was used to correct for losses during sample preparation and average recoveries ranged from 58% (allyl 2,4,6-tribromophenyl ether [ATE]) to 121% (γ-tetrabromoethylcyclohexane (γ-TBECH)). Limits of detection ranged from 0.055 pg g-1 (6-methoxy-PBDE 47) to 38.9 pg g-1 (decabromodiphenylethane (DBDPE)). Matrix effects were overcome through the use of surrogate and performance standards. A single FR (1-bromomethyl-2,3,4,5,6-pentabromobenzene [PBBB]) and two methoxy-PBDEs were detected in commercially available cow's milk collected from local supermarkets in Ottawa, ON, Canada. Detection frequency was < 25% for these compounds and, where present, concentrations were low. [ABSTRACT FROM AUTHOR]

Nakhlites, clinopyroxenite meteorites from Mars, share common crystallization and ejection ages, suggesting that they might have been ejected from the same place on Mars by the same ejection event (impact) and are different samples of the same thick volcanic flow unit or shallow sill. Mean modal abundances and abundance ranges of pyroxene, olivine, and mesostasis vary widely among different thin-sections of an individual nakhlite. Lithologic heterogeneity is the main factor contributing to the observed modal-abundance variations measured in thin-sections prepared from different fragments of the same stone. Two groups of nakhlites are distinguished from one another by which major constituent varies the least and the abundance of that constituent. The group consisting of Nakhla, Lafayette, Governador Valadares, and the Yamato nakhlite pairing group is characterized by low modal mesostasis and pyroxene-olivine covariance, whereas the group consisting of the Miller Range nakhlite pairing group and Northwest Africa 5790 is characterized by low modal olivine and pyroxene-mesostasis covariance. These two groups sample the slowest-cooled interior portion and the chilled margin, respectively, of the nakhlite emplacement body as presently understood, and appear to be also related to recently proposed nakhlite groups independently established using compositional rather than petrographic observations. Phenocryst modal abundances vary with inferred depth in the nakhlite igneous body in a manner consistent with solidification of the nakhlite stack from dynamically sorted phenocryst-rich magmatic crystal-liquid mush. [ABSTRACT FROM AUTHOR]

Transition into motherhood is generally a joyful life event; for some women, however, it is marked by emotional turmoil. Lack of support can be associated with postpartum depression and can compromise both the mother and infant. A descriptive, cross-sectional study (N = 61) was conducted to explore the relationship between social support and postpartum depression and to determine whether mothers overwhelmed with childcare, or overwhelmed with life in general since becoming a mother, sought professional help. The results revealed that screening for depression alone may not be sufficient, that mothers are willing to contact a professional for help in the postpartum period, and that assessments after birth should include a broader assessment of life’s difficulties rather than focusing on childcare responsibilities alone. [ABSTRACT FROM AUTHOR]

Identifying and mapping olivine on asteroid 4 Vesta are important components to understanding differentiation on that body, which is one of the objectives of the Dawn mission. Harzburgitic diogenites are the main olivine-bearing lithology in the howardite-eucrite-diogenite ( HED) meteorites, a group of samples thought to originate from Vesta. Here, we examine all the Antarctic harzburgites and estimate that, on scales resolvable by Dawn, olivine abundances in putative harzburgite exposures on the surface of Vesta are likely at best in the 10-30% range, but probably lower due to impact mixing. We examine the visible/near-infrared spectra of two harzburgitic diogenites representative of the 10-30% olivine range and demonstrate that they are spectrally indistinguishable from orthopyroxenitic diogenites, the dominant diogenitic lithology in the HED group. This suggests that the visible/near-infrared spectrometer onboard Dawn ( VIR) will be unable to resolve harzburgites from orthopyroxenites on the surface of Vesta, which may explain the current lack of identification of harzburgitic diogenite on Vesta. [ABSTRACT FROM AUTHOR]

A variety of dairy and soy-based dairy replacement products (n = 246) purchased from Canadian retail outlets were analysed for baseline levels of melamine (MEL) using a sensitive LC-MS/MS method (method quantification limit = 4 µg/kg). MEL was infrequently detected; only 14% of the items analysed contained quantifiable levels of MEL. The concentrations observed, aside from one recalled sample of candy, ranged from 0.00435 to 0.276 mg/kg, and were at least 10 times lower than the 2.5 mg/kg interim standard for melamine in products containing milk and milk-derived ingredients established by Health Canada. The consumption of foods containing these low levels of MEL does not constitute a health risk for consumers. [ABSTRACT FROM AUTHOR]

A variety of egg-containing, soy-based, fish, shrimp and vegetable products sold in Canada were analysed for melamine (MEL) using a sensitive solid-phase extraction LC-MS/MS analytical method. MEL was detected above the method quantification limit of 0.004 mg/kg in 98 of the 378 samples analysed. Concentrations in the various food product groups ranged 0.00507-0.247 mg/kg (egg-containing items), 0.00408-0.0479 mg/kg (soy-based meat substitutes), 0.00409-1.10 mg/kg (fish and shrimp products), and 0.00464-0.688 mg/kg (vegetable products). MEL was detected less frequently in egg- and soy-containing products. The presence of MEL in most of the Canadian Total Diet Study shrimp composites collected after 2001 suggested the residues in shrimp were caused by a relatively recent exposure to MEL. All concentrations of MEL reported were lower than the 2.5 mg/kg interim standard established for MEL in items containing milk and milk-derived ingredients and the respective maximum residue limits for cyromazine and its metabolite, melamine, in vegetables set by the Canadian Government (2009; http://www.hc-sc.gc.ca/fn-an/securit/chem-chim/melamine/qa-melamine-qr-eng.php#8). The consumption of foods containing these low levels of MEL does not constitute a health risk for consumers. [ABSTRACT FROM AUTHOR]

- We investigate the relationship between the petrology and visible-near infrared spectra of the unbrecciated eucrites and synthetic pyroxene-plagioclase mixtures to determine how spectra obtained by the Dawn mission could distinguish between several models that have been suggested for the petrogenesis of Vesta's crust (e.g., partial melting and magma ocean). Here, we study the spectra of petrologically characterized unbrecciated eucrites to establish spectral observables, which can be used to yield mineral abundances and compositions consistent with petrologic observations. No information about plagioclase could be extracted from the eucrite spectra. In contrast, pyroxene dominates the spectra of the eucrites and absorption band modeling provides a good estimate of the relative proportions of low- and high-Ca pyroxene present. Cr is a compatible element in eucrite pyroxene and is enriched in samples from primitive melts. An absorption at 0.6 μm resulting from Cr3+ in the pyroxene structure can be used to distinguish these primitive eucrites. The spectral differences present among the eucrites may allow Dawn to distinguish between the two main competing models proposed for the petrogenesis of Vesta (magma ocean and partial melting). These models predict different crustal structures and scales of heterogeneity, which can be observed spectrally. The formation of eucrite Allan Hills (ALH) A81001, which is primitive (Cr-rich) and relatively unmetamorphosed, is hard to explain in the magma ocean model. It could only have been formed as a quench crust. If the magma ocean model is correct, then ALHA81001-like material should be abundant on the surface of Vesta and the Vestoids. [ABSTRACT FROM AUTHOR]

To estimate the incidence of traumatic brain injury (TBI) in survivors 18 years old and above in Ireland. To describe the trajectory of rehabilitation/community services for survivors of moderate to severe TBI. To document the experiences of informal caregivers who provide support to TBI survivors in the Republic of Ireland. Data were collected retrospectively and prospectively using a mixed-method, observational cohort study design. Interviews were carried out primarily in respondents' homes (pre Covid-19) or via phone, to assist participants to complete questionnaires. Three cohorts were involved in the study; all were aged 18 years and above, had the capacity to give informed consent and resided in Ireland. Cohort 1 - participants sustained a moderate to severe TBI in the past 3 to 12 months; cohort 2 - participants sustained a TBI over 12 months ago; cohort 3 - non-professional caregivers or family members who provide support to individuals with moderate to severe TBI. There were no interventions. Epidemiological patterns using existing routine data (Major Trauma Audit, Hospital In-Patient Inquiry data, etc.) and calculate the societal burden of TBI from morbidity and mortality data using the Global Burden of Disease framework. Describe the trajectory of care/rehabilitation of TBI survivors and document the experiences of informal carer/support persons. It is expected that we will have epidemiological data, findings on rehabilitation services and caregivers' experiences ready to report for the conference. There is a paucity of TBI Research in Ireland. This national epidemiology and rehabilitation study will inform resource allocation for the redevelopment of neuro-rehabilitation services for brain injured survivors and inform us of carer/support persons' experiences. There are no conflicts of interest for any of the authors listed on the abstract. [ABSTRACT FROM AUTHOR]

Orbital observations of Bennu revealed a surface covered in boulders that are most similar among meteorites in our collections to aqueously altered carbonaceous chondrites, and initial analyses of the returned Bennu sample have begun to reveal insights into Bennu's origins. We identified a suite of paired CM2 chondrite meteorites that have a finely layered texture and bear a striking similarity, although at a different scale, to rugged, layered boulders on Bennu. We investigated the nature and potential origin of this layered texture by performing a petrofabric analysis on samples MET 00431, 00434, and 00435. We developed a micro‐geospatial mapping framework that is more commonly used for landscape‐scale investigations. Our results reveal a pervasive fracture network that exhibits a similar orientation to flattened particles dominated by tochilinite–cronstedtite intergrowths (TCI). We propose that their petrofabrics originated from a low‐energy impact on the parent body that occurred after the main period of aqueous alteration halted. The impactdeformed TCI (which formed during earlier aqueous alteration) and generated the fractures. We propose that the sample from Bennu may contain particles with similar layered textures to these meteorites which, if present, would likewise indicate the dominant role of impacts and aqueous alteration on Bennu's parent body. [ABSTRACT FROM AUTHOR]

As part of the pan-Canadian Maternal-Infant Research on Environmental Chemicals (MIREC) study, human milk samples were collected between 2008 and 2011, and analyzed for mirex, an organochlorine insecticide and flame retardant, in addition to dechlorane plus (syn - and anti -DDC-CO), the flame retardant replacement for mirex. Mirex was analyzed separately, using a method for the analysis of existing organochlorine insecticides, while the presence of DDC-CO isomers was determined using a method developed for the detection of emerging flame retardants. Mirex was detected in all samples analyzed (n = 298), while syn - and anti -DDC-CO were present in 61.0% and 79.5% of the samples, respectively (n = 541). Mirex concentrations have declined in human milk since the 1990s. Since this is the first pan-Canadian dataset reporting DDC-CO concentrations in human milk, no temporal comparisons can be made. Maternal age was correlated with concentrations of both compounds although parity did not impact concentrations of either analyte. Given the presence of this relatively recently identified flame retardant (DDC-CO) in human milk from women across Canada, studies to identify dominant sources of this compound are critical. Despite low concentrations of environmental chemicals in human milk from Canadian women, Health Canada supports breastfeeding of infants because of the important health benefits to both the mothers and their infants. [Display omitted] • First national study of dechlorane plus in Canadian human milk. • Higher detection frequency for anti -dechlorane plus than syn -dechlorane plus. • Mirex was detected in 100% of the samples analyzed, a decrease in levels observed. • Higher concentrations of mirex were observed than syn - and anti -dechlorane plus. • Age was correlated with both mirex and ΣDDC-CO concentrations, but parity was not. [ABSTRACT FROM AUTHOR]