Interactions between arbuscular mycorrhizal fungi and intraspecific competition affect size and size inequality of Plantago lanceolata L.

Intraspecific competition causes decreases in plant size and increases in size inequality. Arbuscular mycorrhizas usually increase the size and inequality of non-competing plants, but mycorrhizal effects often disappear when plants begin competing. We hypothesized that mycorrhizal effects on size inequality would be determined by the experimental conditions, and conducted simultaneous field and glasshouse experiments to investigate how AM fungi and intraspecific competition determine size inequality in Plantago lanceolata. 2 As predicted, plant size was reduced when plants were competing, in both field and controlled conditions. However, size inequality was unexpectedly reduced by competition. Plants may have competed in a symmetric fashion, probably for nutrients, rather than the more common situation, in which plant competition is strongly asymmetric. 3 Mycorrhizas had no effect on plant size or size inequality in competing plants in either field or controlled conditions, possibly because competition for nutrients was intense and negated any benefit the fungi could provide. 4 The effects of mycorrhizas on non-competing plants were also unexpected. In field-grown plants, AM fungi increased plant size, but decreased size inequality: mycorrhizal plants were more even in size, with few very small individuals. In glasshouse conditions, mycorrhizal colonization was extremely high, and was generally antagonistic, causing a reduction in plant size. Here, however, mycorrhizas caused an increase in size inequality, supporting our original hypothesis. This was because most plants were heavily colonized and small, but a few had low levels of colonization and grew relatively large. 5 This study has important implications for understanding the forces that structure plant communities. AM fungi can have a variety of effects on size inequality and thus potentially important influences on long-term plant population dynamics, by affecting the genetic contribution of individuals to the next generation. However, these effects differ, depending on whether plants are competing or not, the degree of mycorrhizal colonization and the responsiveness of the plant to different colonization densities

Highly-parallelized simulation of a pixelated LArTPC on a GPU

The rapid development of general-purpose computing on graphics processing units (GPGPU) is allowing the implementation of highly-parallelized Monte Carlo simulation chains for particle physics experiments. This technique is particularly suitable for the simulation of a pixelated charge readout for time projection chambers, given the large number of channels that this technology employs. Here we present the first implementation of a full microphysical simulator of a liquid argon time projection chamber (LArTPC) equipped with light readout and pixelated charge readout, developed for the DUNE Near Detector. The software is implemented with an end-to-end set of GPU-optimized algorithms. The algorithms have been written in Python and translated into CUDA kernels using Numba, a just-in-time compiler for a subset of Python and NumPy instructions. The GPU implementation achieves a speed up of four orders of magnitude compared with the equivalent CPU version. The simulation of the current induced on 10^3 pixels takes around 1 ms on the GPU, compared with approximately 10 s on the CPU. The results of the simulation are compared against data from a pixel-readout LArTPC prototype

Design and outcomes of a nurse practitioner preceptor development program

ABSTRACT: Nurse practitioners (NPs) are educated to provide high-quality patient- and family-centered care to underserved, culturally diverse, medically complex populations. Nurse practitioner faculty plan curricular activities that challenge NP students to critically assess individuals and populations with the goal of preparing NP students to be "practice-ready" upon graduation. Nurse practitioner clinical training occurs in practice settings with NP preceptors, with specific areas of clinical expertise. However, there is a lack of NP clinical preceptors educationally prepared to clinically teach and evaluate NP students. This article presents the design, implementation, evaluation, and outcomes from a 3-year grant funded by the United States Human Resources and Administration Services that featured a web-based Primary Care Nurse Practitioner Preceptor Development Program. Ninety percent of NPs who precepted NP students completed all web-based learning modules. Preceptors with educational preparation via online modules to guide NP student learning in clinical settings are a critical resource for faculty to prepare NP students to be practice-ready upon graduation. This web-based learning platform for online NP preceptor education may be a successful approach for expanding and improving the NP preceptor pool nationwide

Design and outcomes of a nurse practitioner preceptor development program

ABSTRACT: Nurse practitioners (NPs) are educated to provide high-quality patient- and family-centered care to underserved, culturally diverse, medically complex populations. Nurse practitioner faculty plan curricular activities that challenge NP students to critically assess individuals and populations with the goal of preparing NP students to be "practice-ready" upon graduation. Nurse practitioner clinical training occurs in practice settings with NP preceptors, with specific areas of clinical expertise. However, there is a lack of NP clinical preceptors educationally prepared to clinically teach and evaluate NP students. This article presents the design, implementation, evaluation, and outcomes from a 3-year grant funded by the United States Human Resources and Administration Services that featured a web-based Primary Care Nurse Practitioner Preceptor Development Program. Ninety percent of NPs who precepted NP students completed all web-based learning modules. Preceptors with educational preparation via online modules to guide NP student learning in clinical settings are a critical resource for faculty to prepare NP students to be practice-ready upon graduation. This web-based learning platform for online NP preceptor education may be a successful approach for expanding and improving the NP preceptor pool nationwide