Regulation of nitrogen uptake and assimilation: Effects of nitrogen source, root-zone pH, and aerial CO2 concentration on growth and productivity of soybeans

An important feature of controlled-environment crop production systems such as those to be used for life support of crews during space exploration is the efficient utilization of nitrogen supplies. Making decisions about the best sources of these supplies requires research into the relationship between nitrogen source and the physiological processes which regulate vegetative and reproductive plant growth. Work done in four areas within this research objective is reported: (1) experiments on the effects of root-zone pH on preferential utilization of NO3(-) versus NH4(+) nitrogen; (2) investigation of processes at the whole-plant level that regulate nitrogen uptake; (3) studies of the effects of atmospheric CO2 and NO3(-) supply on the growth of soybeans; and (4) examination of the role of NO3(-) uptake in enhancement of root respiration

Nitrogen uptake and utilization by intact plants

The results of experiments support the proposed conceptual model that relates nitrogen uptake activity by plants as a balanced interdependence between the carbon-supplying function of the shoot and the nitrogen-supplying function of the roots. The data are being used to modify a dynamic simulation of plant growth, which presently describes carbon flows through the plant, to describe nitrogen uptake and assimilation within the plant system. Although several models have been proposed to predict nitrogen uptake and partitioning, they emphasize root characteristics affecting nutrient uptake and relay on empirical methods to describe the relationship between nitrogen and carbon flows within the plant. Researchers, on the other hand, propose to continue to attempt a mechanistic solution in which the effects of environment on nitrogen (as well as carbon) assimilation are incorporated through their direct effects on photosynthesis, respiration, and aging processes

Book Review: State Supreme Courts in State and Nation. by G. Alan Tarr and Mary Cornelia Aldis Porter.

Book review: State Supreme Courts in State and Nation. By G. Alan Tarr and Mary Cornelia Aldis Porter. New Haven, Conn.: Yale University Press. 1988. Pp. 288. Reviewed by: Michael C. Tolley

Exact Wave Solutions to 6D Gauged Chiral Supergravity

We describe a broad class of time-dependent exact wave solutions to 6D gauged chiral supergravity with two compact dimensions. These 6D solutions are nontrivial warped generalizations of 4D pp-waves and Kundt class solutions and describe how a broad class of previously-static compactifications from 6D to 4D (sourced by two 3-branes) respond to waves moving along one of the uncompactified directions. Because our methods are generally applicable to any higher dimensional supergravity they are likely to be of use for finding the supergravity limit of time-dependent solutions in string theory. The 6D solutions are interesting in their own right, describing 6D shock waves induced by high energy particles on the branes, and as descriptions of the near-brane limit of the transient wavefront arising from a local bubble-nucleation event on one of the branes, such as might occur if a tension-changing phase transition were to occur.Comment: 22 pages, 1 figure. Minor clarifications added. Accepted in JHE

On Black Holes in Massive Gravity

In massive gravity the so-far-found black hole solutions on Minkowski space happen to convert horizons into a certain type of singularities. Here we explore whether these singularities can be avoided if space-time is not asymptotically Minkowskian. We find an exact analytic black hole (BH) solution which evades the above problem by a transition at large scales to self-induced de Sitter (dS) space-time, with the curvature scale set by the graviton mass. This solution is similar to the ones discovered by Koyama, Niz and Tasinato, and by Nieuwenhuizen, but differs in detail. The solution demonstrates that in massive GR, in the Schwarzschild coordinate system, a BH metric has to be accompanied by the St\"uckelberg fields with nontrivial backgrounds to prevent the horizons to convert into the singularities. We also find an analogous solution for a Reissner-Nordstr\"om BH on dS space. A limitation of our approach, is that we find the solutions only for specific values of the two free parameters of the theory, for which both the vector and scalar fluctuations loose their kinetic terms, however, we hope our solutions represent a broader class with better behaved perturbations.Comment: 17 LateX page

Reframing Occupational Stress to Mitigate Burnout: A Trauma-Informed Care and Constructive Living Approach to Foster Lifelong Resiliency and Self-Directed Life Management within Academic Libraries

This editorial chapter addresses the problem of burnout in academic libraries by introducing a fusion of principles from trauma-informed care (TIC) and Constructive Living (CL) to offer unique, easy-to-incorporate plans of action to identify and mitigate symptoms of burnout. These two action-based philosophies, which may be new to most readers, provide strategies for considering, practicing, and adopting perspectives and behaviors that may give those suffering from burnout new ways of thinking about their professional and personal lives. We identify accessible opportunities to connect mind and body in self-care to neutralize negative self-talk, regain perspective and balance, and foster lifelong resiliency at a pace wholly determined by the individual and without formal training or expense

Digital literacy education for UK undergraduate pharmacy students: A mixed-methods study

\ua9 2024 The Author(s). Objectives: Digital literacy is increasingly crucial in pharmacy practice, and relevant education and training are required to prepare the future workforce. This study aims to explore the current and planned inclusion of digital literacy education in the undergraduate curricula of UK pharmacy schools. Methods: A mixed-methods approach was conducted with two phases. The first involved a content analysis of published curricula from all 30 UK pharmacy schools. The second phase included a survey based on the Health Education England Digital Capabilities Framework, distributed to academic staff across all pharmacy schools. Key findings: Data from 14 pharmacy schools\u27 curricula were included in the analysis, with 10 reporting digital literacy education. Key themes identified from the analysed documents included understanding of health informatics, applied informatics, information technology skills, and the emerging digital health technology. Nineteen respondents from 16 schools participated in the survey; digital literacy inclusion was reported by 18 participants. There was variable alignment of digital literacy competencies with the Health Education England framework. Digital literacy was mainly integrated into existing teaching sessions, predominantly through self-learning (n = 12). Electronic Health Records and remote counselling were the main focus areas within the curricula. Challenges in implementing digital literacy include a lack of expertise (n = 13), and time constraints (n = 10). Conclusions: The trend towards embedding digital literacy in UK pharmacy curricula is clear, but disparities suggest the need for a more unified strategy. Recommendations include establishing a specific digital literacy framework aligned with professional needs, improving accessibility and transparency in curricula documents, and investing in faculty development

Fur Trappers in the Northwest Territories: An Econometric Analysis of the Factors Influencing Participation

Commercial fur trapping, once the primary economic activity of the aboriginal inhabitants of the Northwest Territories, now accounts for only a small fraction of the income received by native people. Many adult native males do continue to engage in commercial trapping, nevertheless, though with varying degrees of commitment. A review of the recent literature reveals a wide variety of suggested motivations for this continuing involvement. Through the use of econometric techniques we are able to analyze the motivations of two distinct sub-groups of trappers. One group, accounting for about 15% of those who trap, has a substantial commitment to the activity and is motivated primarily by the income-earning potential of fur sales. The second group, which includes approximately 85% of the participants, consists of those whose participation is best explained by the lack of alternative employment opportunities.