Linking soil microbial community structure to potential carbon mineralization: A continental scale assessment of reduced tillage

Potential carbon mineralization (Cmin) is a commonly used indicator of soil health, with greater Cmin values interpreted as healthier soil. While Cmin values are typically greater in agricultural soils managed with minimal physical disturbance, the mechanisms driving the increases remain poorly understood. This study assessed bacterial and archaeal community structure and potential microbial drivers of Cmin in soils maintained under various degrees of physical disturbance. Potential carbon mineralization, 16S rRNA sequences, and soil characterization data were collected as part of the North American Project to Evaluate Soil Health Measurements (NAPESHM). Results showed that type of cropping system, intensity of physical disturbance, and soil pH influenced microbial sensitivity to physical disturbance. Furthermore, 28% of amplicon sequence variants (ASVs), which were important in modeling Cmin, were enriched under soils managed with minimal physical disturbance. Sequences identified as enriched under minimal disturbance and important for modeling Cmin, were linked to organisms which could produce extracellular polymeric substances and contained metabolic strategies suited for tolerating environmental stressors. Understanding how physical disturbance shapes microbial communities across climates and inherent soil properties and drives changes in Cmin provides the context necessary to evaluate management impacts on standardized measures of soil microbial activity

The Winchcombe meteorite, a unique and pristine witness from the outer solar system.

Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is the most accurately recorded carbonaceous chondrite fall. Its pre-atmospheric orbit and cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours after falling, the composition of the Winchcombe meteorite is largely unmodified by the terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, and carbon- and nitrogen-bearing organic matter including soluble protein amino acids. The near-pristine hydrogen isotopic composition of the Winchcombe meteorite is comparable to the terrestrial hydrosphere, providing further evidence that volatile-rich carbonaceous asteroids played an important role in the origin of Earth's water

Time use of advanced practice nurses in hospitals: A cross‐sectional study

Aims To examine the use of time by advanced practice nurses and time use differences according to type of healthcare organization, work experience, and supervisor. Design A cross-sectional, observational study. Methods Non-participant observations were executed in Belgium (October 2015-January 2016). Time use was categorized in domains (patient/family, team, healthcare organization) and roles (clinical expert, educator/coach, change agent/innovator, researcher, leader, collaborator, and ethical decision-making facilitator). Proportional working time in domains and roles was calculated. Chi-squared tests identified differences in time use according to type of healthcare organization, number of years of work experience, and type of hierarchical/functional supervisor. Results Participants mainly devoted time to the patient/family domain (30.78%) and the clinical expert role (34.19%). The role of leader and ethical decision-making facilitator covered, respectively, 4.84% and 0.07% of participants' time. Time distribution in domains and roles differed between participants in university and peripheral hospitals. Conclusion Activities were executed in all domains and roles, except for the ethical decision-making facilitator role. Further research could uncover barriers and facilitators for role execution, especially about leadership and ethical decision-making. Impact Advanced practice nurses, supervisors and policymakers could act to optimize advanced practice nurses' scope of practice

Advancing water resource management in agricultural, rural, and urbanizing watersheds: Why land-grant universities matter

Federally funded university water programs have had limited success in halting the degradation of water resources in agricultural, rural, and urbanizing watersheds for the past five decades. USDA-funded university water programs have advanced our understanding of watershed processes and the development of best management practices (BMPs; e.g., conservation tillage, nutrient management, alternative and innovative septic systems, and riparian buffers) to mitigate environmental risks from anthropogenic activities, in particular from agriculture, to our water resources; yet water degradation persists and has worsened in many watersheds (Howarth et al. 2000; Mueller and Spahr 2006). The National Research Council (2012) stresses the need for sustainable agricultural practices to reduce changes in flow regimes and water quality. In this research editorial, we make four points relative to solving water resource issues: (1) they are complex problems and difficult to solve; (2) some progress has been made on solving these issues; (3) external nonstationary drivers such as land use changes, climate change and variability, and shifts in markets, policies, and regulations warrant constant vigilance to assure that presumed improvements are being attained; and (4) we are poised to make substantial progress on these challenges over the next 10 to 20 years if critical steps are… This is an excerpt from the article and not a full abstract