Rare Earth Element Adsorption to Clay Minerals: Mechanistic Insights and Implications for Recovery from Secondary Sources.

The energy transition will have significant mineral demands and there is growing interest in recovering critical metals, including rare earth elements (REE), from secondary sources in aqueous and sedimentary environments. However, the role of clays in REE transport and deposition in these settings remains understudied. This work investigated REE adsorption to the clay minerals illite and kaolinite through pH adsorption experiments and extended X-ray absorption fine structure (EXAFS). Clay type, pH, and ionic strength (IS) affected adsorption, with decreased adsorption under acidic pH and elevated IS. Illite had a higher adsorption capacity than kaolinite; however, >95% adsorption was achieved at pH ∼7.5 regardless of IS or clay. These results were used to develop a surface complexation model with the derived binding constants used to predict REE speciation in the presence of competing sorbents. This demonstrated that clays become increasingly important as pH increases, and EXAFS modeling showed that REE can exist as both inner- and outer-sphere complexes. Together, this indicated that clays can be an important control on the transport and enrichment of REE in sedimentary systems. These findings can be applied to identify settings to target for resource extraction or to predict REE transport and fate as a contaminant.

A sedimentary record of the evolution of the global marine phosphorus cycle.

Phosphorus (P) is typically considered to be the ultimate limiting nutrient for Earth's biosphere on geologic timescales. As P is monoisotopic, its sedimentary enrichment can provide some insights into how the marine P cycle has changed through time. A previous compilation of shale P enrichments argued for a significant change in P cycling during the Ediacaran Period (635-541 Ma). Here, using an updated P compilation-with more than twice the number of samples-we bolster the case that there was a significant transition in P cycling moving from the Precambrian into the Phanerozoic. However, our analysis suggests this state change may have occurred earlier than previously suggested. Specifically in the updated database, there is evidence for a transition ~35 million years before the onset of the Sturtian Snowball Earth glaciation in the Visingsö Group, potentially divorcing the climatic upheavals of the Neoproterozoic from changes in the Earth's P cycle. We attribute the transition in Earth's sedimentary P record to the onset of a more modern-like Earth system state characterized by less reducing marine conditions, higher marine P concentrations, and a greater predominance of eukaryotic organisms encompassing both primary producers and consumers. This view is consistent with organic biomarker evidence for a significant eukaryotic contribution to the preserved sedimentary organic matter in this succession and other contemporaneous Tonian marine sedimentary rocks. However, we stress that, even with an expanded dataset, we are likely far from pinpointing exactly when this transition occurred or whether Earth's history is characterized by a single or multiple transitions in the P cycle.

The impact of COVID-19 on nurse leadership characteristics.

BACKGROUND: Nurse leaders are vital for improving nursing efficiencies and the quality of care that they provide during a crisis and its aftermath. The value of positive leadership characteristics has never been more critical than during the COVID-19 pandemic. Functioning in a crisis mode required nurse leaders to demonstrate the necessary skills for clear communication and solid leadership. Therefore, nursing leadership, especially in emergencies such as the COVID-19 pandemic, needs to be transformative in the sense that leaders are informational, motivating, and able to advance the organization, notwithstanding a global pandemic. Timely leadership research during and after COVID-19 is crucial for filling the literature gap resulting from the unique changes in the nursing profession in the post-pandemic period. OBJECTIVE: This study aimed to investigate leadership characteristics shown by nurse leaders during the COVID-19 pandemic, and investigate nurses' perceptions of nurse leader effectiveness based on leaders' work roles. METHODS: An exploratory, quantitative study was conducted 18 months after the declaration of the COVID-19 pandemic (June-August 2021). The Multifactor Leadership Questionnaire (MLQ 5X) was sent to registered nurses (RNs) in Texas using the State Board's listing of active RNs. In total, 70 practicing RNs participated in the study. Data were analyzed using descriptive statistics and multivariate correlational analysis. RESULTS: Perceived leadership characteristics remained primarily transformational. Nurse directors and executives reported positive leadership characteristics more frequently than did staff and charge nurses. LINKING EVIDENCE TO ACTION: Specific tactics and strategies must be adopted to support nurses and nursing leadership during ongoing healthcare challenges. Close monitoring of leadership characteristics will enable organizations to support and provide educational opportunities for ongoing organizational success.

Timing the evolution of antioxidant enzymes in cyanobacteria.

The ancestors of cyanobacteria generated Earth's first biogenic molecular oxygen, but how they dealt with oxidative stress remains unconstrained. Here we investigate when superoxide dismutase enzymes (SODs) capable of removing superoxide free radicals evolved and estimate when Cyanobacteria originated. Our Bayesian molecular clocks, calibrated with microfossils, predict that stem Cyanobacteria arose 3300-3600 million years ago. Shortly afterwards, we find phylogenetic evidence that ancestral cyanobacteria used SODs with copper and zinc cofactors (CuZnSOD) during the Archaean. By the Paleoproterozoic, they became genetically capable of using iron, nickel, and manganese as cofactors (FeSOD, NiSOD, and MnSOD respectively). The evolution of NiSOD is particularly intriguing because it corresponds with cyanobacteria's invasion of the open ocean. Our analyses of metalloenzymes dealing with reactive oxygen species (ROS) now demonstrate that marine geochemical records alone may not predict patterns of metal usage by phototrophs from freshwater and terrestrial habitats.

Nurse manager communication and outcomes for nursing: An integrative review.

AIM: To evaluate literature on the importance of good communication between managers and nurses, and its influence on nurses and patient care. BACKGROUND: In the nursing scenario, concepts such as engagement and job satisfaction are tied to manager communication and influence the care provided (Kunie et al., 2017). It is crucial to recognize the importance of manager communication on the nurses and patient care. The evaluation was guided by this question: in the review of post-2014 quantitative studies, is there evidence that nurse managers with high communication competence have better patient/staff outcomes than those with lower competencies? EVALUATION: We evaluated current research through an evidence review on the day-to-day influence of nurse manager communication. We conducted our search using common health databases. Since the American Organization for Nurse Leadership developed nurse manager competencies in 2014, we only included articles published after that year. Further inclusion criteria included primary, quantitative and peer-reviewed research. KEY ISSUES: Thirty articles remained after the application of inclusion/exclusion criteria with five themes emerging: patient safety and quality, job satisfaction, leadership styles, innovative practice and general management skills. CONCLUSION: Research associates positive patient and staff outcomes with a leader who exhibits communication competences. IMPLICATIONS FOR NURSING MANAGEMENT: Assessment of current competence levels in communication in nurse managers is needed. Education for improving communication skills is also needed.

Microbial processes during deposition and diagenesis of Banded Iron Formations.

Banded Iron Formations (BIFs) are marine chemical sediments consisting of alternating iron (Fe)-rich and silica (Si)-rich bands which were deposited throughout much of the Precambrian era. BIFs represent important proxies for the geochemical composition of Precambrian seawater and provide evidence for early microbial life. Iron present in BIFs was likely precipitated in the form of Fe3+ (Fe(III)) minerals, such as ferrihydrite (Fe(OH)3), either through the metabolic activity of anoxygenic photoautotrophic Fe2+ (Fe(II))-oxidizing bacteria (photoferrotrophs), by microaerophilic bacteria, or by the oxidation of dissolved Fe(II) by O2 produced by early cyanobacteria. However, in addition to oxidized Fe-bearing minerals such as hematite (FeIII 2O3), (partially) reduced minerals such as magnetite (FeIIFeIII 2O4) and siderite (FeIICO3) are found in BIFs as well. The presence of reduced Fe in BIFs has been suggested to reflect the reduction of primary Fe(III) minerals by dissimilatory Fe(III)-reducing bacteria, or by metamorphic (high pressure and temperature) reactions occurring in presence of buried organic matter. Here, we present the current understanding of the role of Fe-metabolizing bacteria in the deposition of BIFs, as well as competing hypotheses that favor an abiotic model for BIF deposition. We also discuss the potential abiotic and microbial reduction of Fe(III) in BIFs after deposition. Further, we review the availability of essential nutrients (e.g. P and Ni) and their implications on early Earth biogeochemistry. Overall, the combined results of various ancient seawater analogue experiments aimed at assessing microbial iron cycling pathways, coupled with the analysis of the BIF rock record, point towards a strong biotic influence during BIF genesis.

Weathering, alteration and reconstructing Earth's oxygenation.

Deciphering the role-if any-that free oxygen levels played in controlling the timing and tempo of the radiation of complex life is one of the most fundamental questions in Earth and life sciences. Accurately reconstructing Earth's redox history is an essential part of tackling this question. Over the past few decades, there has been a proliferation of research employing geochemical redox proxies in an effort to tell the story of Earth's oxygenation. However, many of these studies, even those considering the same geochemical proxy systems, have led to conflicting interpretations of the timing and intensity of oxygenation events. There are two potential explanations for conflicting redox reconstructions: (i) that free oxygen levels were incredibly dynamic in both time and space or (ii) that collectively, as a community-including the authors of this article-we have frequently studied rocks affected by secondary weathering and alteration (particularly secondary oxidation) while neglecting to address the impact of this alteration on the generated data. There are now multiple case studies that have documented previously overlooked secondary alteration, resolving some of the conflicting constrains regarding redox evolution. Here, an analysis of a large shale geochemistry database reveals significant differences in cerium (Ce) anomalies, a common palaeoredox proxy, between outcrop and drill core samples. This inconsistency provides support for the idea that geochemical data from altered samples are frequently published in the peer-reviewed literature. As individuals and a geochemical community, most of us have been slow to appreciate how pervasive the problem is but there are examples of other communities that have faced and met the challenges raised by such quality control crises. Further evidence of the high potential for alteration of deep-time geochemical samples, and recognition of the manner in which this may lead to spurious results and palaeoenvironmental interpretations, indicate that sample archiving, in publicly accessible collections needs to become a prerequisite for publication of new palaeoredox data. Finally, the geochemical community need to think about ways to implement additional quality control measures to increase the fidelity of palaeoredox proxy work.

Don't Be a Serial Citer. Synthesize!

This article describes an interactive teaching-learning strategy titled "Don't Be a Serial Citer. Synthesize!" The strategy is used during an onsite, face-to-face orientation to help new graduate nursing students overcome the tendency to be "serial citers." Although the primary purpose is to develop students' beginning skills at performing synthesis writing, there are important secondary outcomes attached to the experience, including the opportunity for students to be involved in a positive experience during group work and getting to know their classmates. This activity takes approximately two hours to complete.

Stress and Health in Nursing Students: The Nurse Engagement and Wellness Study.

BACKGROUND: Evidence suggests that behavioral, social, and environmental factors may modify the effects of life stress on health and performance of new nurses as they transition to hospitals. OBJECTIVES: The aim of this study was to describe the methods of a project designed to investigate the role of social, behavioral, and environmental factors in modifying the adverse effects of stress on new nurses and to discuss demographic, health, and life stress characteristics of the cohort at baseline. METHODS: A prospective cohort design was used to conduct a comprehensive assessment of health endpoints, life stress, behaviors, personal traits, social factors, indicators of engagement and performance, and environmental exposures in nursing students. Adjusted odds ratios and analyses of covariance were used to examine associations between these factors at baseline. RESULTS: Health indicators in the cohort were comparable or better than in the broader United States population, and lifetime stress exposure was lower than among students from other majors. Exposure to more lifetime stressors was associated with greater risk for various health conditions, including hypertension, diabetes, and depression. Conversely, better social, environmental, behavioral, and personal profiles were associated with protective effects for the same health conditions. DISCUSSION: These data comprehensively summarize the lives of predominately Hispanic nursing students and highlight risk and resilience factors associated with their health and well-being. The findings are timely, as the nursing field diversifies in preparation to care for a diverse and aging population. Comprehensively assessing stress-health relationships among student nurses ought to inform the policies, practices, and curricula of nursing schools to better prepare nurses to thrive in the often-strenuous healthcare environment.

The Relationship of Childhood Adversity on Burnout and Depression Among BSN Students.

BACKGROUND: Research evidence strongly suggests that Adverse Childhood Experiences (ACEs) predispose individuals to development of an increased sensitivity to stress and negative physical and mental health outcomes in adulthood. PURPOSE: To determine if there was a relationship between the number of ACEs reported by first semester BSN students and their reported level of Burnout and Depression. METHODS: 211 students enrolled in the first semester of upper division courses of their BSN program completed self-report questionnaires which measured the number of ACEs, the level of Depression and the level of Burnout. RESULTS: The number of reported ACEs by participants had a significant relationship on the levels of burnout and severity of depressive symptoms. Female students with a higher number of ACEs were more likely to report higher levels of Burnout A (Emotional Exhaustion) and Burnout B (Depersonalization), and higher depression severity scores compared to males. CONCLUSION: Nursing programs should educate faculty concerning the frequency and range of adverse experiences that students may have had prior to admission to the nursing program, and the possible relationship with Burnout and Depression. Faculty can provide early information on counseling and support services.

Earth's youngest banded iron formation implies ferruginous conditions in the Early Cambrian ocean.

It has been proposed that anoxic and iron-rich (ferruginous) marine conditions were common through most of Earth history. This view represents a major shift in our understanding of the evolution of marine chemistry. However, thus far, evidence for ferruginous conditions comes predominantly from Fe-speciation data. Given debate over these records, new evidence for Fe-rich marine conditions is a requisite if we are to shift our view regarding evolution of the marine redox landscape. Here we present strong evidence for ferruginous conditions by describing a suite of Fe-rich chemical sedimentary rocks-banded iron formation (BIF)--deposited during the Early Cambrian in western China. Specifically, we provide new U-Pb geochronological data that confirm a depositional age of ca. 527 Ma for this unit, as well as rare earth element (REE) data are consistent with anoxic deposition. Similar to many Algoma-type Precambrian iron formations, these Early Cambrian sediments precipitated in a back-arc rift basin setting, where hydrothermally sourced iron drove the deposition of a BIF-like protolith, the youngest ever reported of regional extent without direct links to volcanogenic massive sulphide (VMS) deposits. Their presence indicates that marine environments were still characterized by chemical- and redox-stratification, thus supporting the view that-despite a dearth of modern marine analogues-ferruginous conditions continued to locally be a feature of early Phanerozoic seawater.

Evolution of the global phosphorus cycle.

The macronutrient phosphorus is thought to limit primary productivity in the oceans on geological timescales. Although there has been a sustained effort to reconstruct the dynamics of the phosphorus cycle over the past 3.5 billion years, it remains uncertain whether phosphorus limitation persisted throughout Earth's history and therefore whether the phosphorus cycle has consistently modulated biospheric productivity and ocean-atmosphere oxygen levels over time. Here we present a compilation of phosphorus abundances in marine sedimentary rocks spanning the past 3.5 billion years. We find evidence for relatively low authigenic phosphorus burial in shallow marine environments until about 800 to 700 million years ago. Our interpretation of the database leads us to propose that limited marginal phosphorus burial before that time was linked to phosphorus biolimitation, resulting in elemental stoichiometries in primary producers that diverged strongly from the Redfield ratio (the atomic ratio of carbon, nitrogen and phosphorus found in phytoplankton). We place our phosphorus record in a quantitative biogeochemical model framework and find that a combination of enhanced phosphorus scavenging in anoxic, iron-rich oceans and a nutrient-based bistability in atmospheric oxygen levels could have resulted in a stable low-oxygen world. The combination of these factors may explain the protracted oxygenation of Earth's surface over the last 3.5 billion years of Earth history. However, our analysis also suggests that a fundamental shift in the phosphorus cycle may have occurred during the late Proterozoic eon (between 800 and 635 million years ago), coincident with a previously inferred shift in marine redox states, severe perturbations to Earth's climate system, and the emergence of animals.

The tipping point: intimate partner violence among hispanic women of mexican origin / El punto de inflexión: violencia de pareja entre las mujeres hispanas de origen mexicano

Intimate partner violence (IPV) is an international public health problem. In the United States, IPV appears to be more prevalent among Hispanic women when compared to non-Hispanic women. Despite the body of research that focused on IPV among Hispanic women, no study could be located that describes how Hispanic women experiencing IPV decide to leave a relationship in which IPV is occurring. AIMS: the purpose of this study is to use qualitative methods to explore how Hispanic women of Mexican origin who have experienced IPV decided to leave the relationship in which IPV occurred. METHODS: fifty-nine women of Mexican origin were recruited from a low-income housing authority complex in El Paso, TX to participate in audiotaped focus groups. Data from the focus groups were transcribed and analyzed using grounded theory (GT) methodology. Data were collected until saturation was achieved. RESULTS: participants were able to describe a process whereby they decided to leave a relationship in which IPV was occurring. The process included the categories of the shadow of violence, Vulnerability, Normalizing violence, the Tipping point, Lucidity, and Escaping the shadow of violence. CONCLUSIONS: the results of the study provided some important clinical implications for nurses providing care to Hispanic women experiencing IPV, or Hispanic women at risk for IPV. Results of this study provide directions for future research focused on the unique experiences of Hispanic women of Mexican origin in the context of IPV.

La violencia de pareja es un problema de salud pública. En los Estados Unidos parece ser más frecuente entre las mujeres hispanas, en comparación con las mujeres no hispanas. A pesar de la cantidad de investigaciones focalizadas en violencia de pareja entre las mujeres hispanas, no se encontró ningún estudio que describa cómo las mujeres hispanas que experimentan violencia de pareja deciden abandonar una relación de este tipo. OBJETIVOS: el objetivo de este estudio es utilizar métodos cualitativos para explorar cómo las mujeres hispanas de origen mexicano que han experimentado violencia de pareja decidieron terminar con la relación de pareja. MÉTODOS: investigación cualitativa, con grupos focales cuyos participantes fueron cincuenta y nueve mujeres de origen mexicano reclutadas en un complejo de viviendas de bajos ingresos en El Paso, TX. Los grupos focales que se grabaron en video. Los datos de los grupos focales fueron transcritos y analizados utilizando la metodología de la teoría fundamentada y se recogieron hasta que se alcanzó la saturación. RESULTADOS: los participantes fueron capaces de describir el proceso por el que decidieron dejar una relación en la que se estaba produciendo violencia de pareja. El proceso incluye las categorías de la sombra de la violencia, la vulnerabilidad, normalización de la violencia, el punto de inflexión, la lucidez, y escapar de la sombra de la violencia. CONCLUSIONES: los resultados del estudio proporcionan algunas implicaciones clínicas importantes para las enfermeras que atienden a las mujeres hispanas que experimentan violencia de pareja, o las mujeres hispanas en riesgo de maltrato. Los resultados de este estudio proporcionan directrices para futuras investigaciones.

The Archean Nickel Famine Revisited.

Iron formations (IF) preserve a history of Precambrian oceanic elemental abundance that can be exploited to examine nutrient limitations on early biological productivity. However, in order for IF to be employed as paleomarine proxies, lumped-process distribution coefficients for the element of interest must be experimentally determined or assumed. This necessitates consideration of bulk ocean chemistry and which authigenic ferric iron minerals controlled the sorption reactions. It also requires an assessment of metal mobilization reactions that might have occurred in the water column during particle descent and during post-depositional burial. Here, we summarize recent developments pertaining to the interpretation and fidelity of the IF record in reconstructions of oceanic trace element evolution. Using an updated compilation, we reexamine and validate temporal trends previously reported for the nickel content in IF (see Konhauser et al., 2009 ). Finally, we reevaluate the consequences of methanogen Ni starvation in the context of evolving views of the Archean ocean-climate system and how the Ni famine may have ultimately facilitated the rise in atmospheric oxygen.

THE EFFECT OF A CULTURALLY TAILORED SUBSTANCE ABUSE PREVENTION INTERVENTION WITH PLAINS INDIAN ADOLESCENTS.

PURPOSE: To examine the effects of incorporating tribal specific cultural beliefs into a tailored substance abuse prevention intervention for at risk rural Oklahoma Native American Indian (NAI) Plains adolescents. RESEARCH DESIGN: The 10 hour Native American Talking Circle Intervention, a school-based, group substance abuse prevention program, was implemented over a 8.5 week period and evaluated using a one group, pretest-posttest design. Measurements were from the Native Self-Reliance Questionnaire and the Substance Problems Scale from Global Appraisal of Individual Needs-Quick (GAIN-Q). FINDINGS: One-tailed, paired sample t-tests demonstrated significant increase in self-reliance, from 86.227 to 92.204 (t (43) = -2.580, p = .007) and a decrease in substance abuse/use, from 2.265 to 1.265 (t (33) = 1.844, p = .007). CONCLUSIONS: The Native Talking Circle Intervention based on tribal-specific values and beliefs was shown to be effective with substance abuse/use at-risk NAI Plains tribal adolescents.

Proterozoic ocean redox and biogeochemical stasis.

The partial pressure of oxygen in Earth's atmosphere has increased dramatically through time, and this increase is thought to have occurred in two rapid steps at both ends of the Proterozoic Eon (∼2.5-0.543 Ga). However, the trajectory and mechanisms of Earth's oxygenation are still poorly constrained, and little is known regarding attendant changes in ocean ventilation and seafloor redox. We have a particularly poor understanding of ocean chemistry during the mid-Proterozoic (∼1.8-0.8 Ga). Given the coupling between redox-sensitive trace element cycles and planktonic productivity, various models for mid-Proterozoic ocean chemistry imply different effects on the biogeochemical cycling of major and trace nutrients, with potential ecological constraints on emerging eukaryotic life. Here, we exploit the differing redox behavior of molybdenum and chromium to provide constraints on seafloor redox evolution by coupling a large database of sedimentary metal enrichments to a mass balance model that includes spatially variant metal burial rates. We find that the metal enrichment record implies a Proterozoic deep ocean characterized by pervasive anoxia relative to the Phanerozoic (at least ∼30-40% of modern seafloor area) but a relatively small extent of euxinic (anoxic and sulfidic) seafloor (less than ∼1-10% of modern seafloor area). Our model suggests that the oceanic Mo reservoir is extremely sensitive to perturbations in the extent of sulfidic seafloor and that the record of Mo and chromium enrichments through time is consistent with the possibility of a Mo-N colimited marine biosphere during many periods of Earth's history.