The Impact of America\u27s Choice on Writing Performance in Georgia: First-Year Results

During the first year of implementation, the emphasis of the America\u27s Choice school reform design is an intensive focus on building students\u27 writing skills. Writers workshop, the primary instructional emphasis of America\u27s Choice during this year, is the component of the design for which teachers first receive in-depth training. In keeping with the emphasis of America\u27s Choice, this year-one external evaluation study of the impact of America\u27s Choice on student performance in Georgia focuses on student writing performance. The study examines changes in student writing performance from 2001 to 2002, the initial year of implementation of America\u27s Choice in 109 Georgia elementary schools and 50 Georgia middle schools. Because state writing assessments were administered to students in fifth and eighth grades, our analyses are restricted to these grade levels

Those Who Can, Do and They Teach Too: Faculty Clinical Productivity and Teaching

Objective: Academic emergency physicians (EPs) often feel that the demands of clinical productivity, income generation, and patient satisfaction conflict with educational objectives. The objective of this study was to explore whether the quality of faculty bedside teaching of residents correlated with high clinical productivity, measured by relative value units (RVUs). We also explored the strategies of high-performing faculty for optimal RVU generation and teaching performance.Methods: We performed a mixed method study using quantitative and qualitative methods to analyze the relationship between RVUs, patient satisfaction, and teaching performance. We examined the relationship between teaching performance ratings, patient satisfaction, and RVUs per hour using correlations. Following this initial analysis, we conducted semi-structured interviews with the eight faculty members who have the highest clinical (RVU) and educational productivity ratings to learn more about their strategies for success. Our Institutional Review Board approved this study.Results: We correlated resident evaluations of faculty with RVUs billed per hour. We conducted semi-structured interviews of faculty who led in both RVU productivity and resident evaluations. From these interviews, several themes emerged. When asked about how they excel in billing, most said that they pay attention to dictating a thorough chart on every patient and try to “stay busy” throughout their entire shift. When asked how they excel at resident education, most leading faculty said that they try to find a “teaching moment” and find small “clinical pearls” to pass along. Nevertheless, all eight leading faculty members believe that as the emphasis on billing productivity increases, resident and student education will suffer.Conclusion: Contrary to the opinion of some physicians, faculty can excel at both clinical productivity and resident education. This study found that highly efficient clinical productivity correlated with excellent resident teaching. This high level of performance did not appear to be at the expense of other important measures such as patient satisfaction or student teaching. [West J Emerg Med. 2011;12(2):254-257.

Resident-Led Physical Wellness Initiative Linked to Less Burnout for Emergency Physicians during COVID-19 Pandemic

Introduction: The COVID-19 pandemic has taken a significant toll on societal, physical, and psychological health. Emergency physicians (EPs) are susceptible to burnout under ordinary circumstances and may be particularly vulnerable during the pandemic. To reduce pandemic-related burnout, we implemented a residency-led physical wellness initiative and evaluated the effect on burnout among EPs. Methods: In the spring of 2020, we invited all resident and attending EPs in our department to participate in a four-week physical wellness initiative as part of a prospective study. After completing or opting out of this wellness initiative, EPs responded to an online survey comprised of five sections: demographics, participation, opinion on wellness initiative, opinion on the impact of COVID-19, and the Maslach Burnout Index (MBI-HSS). We stratified respondents by initiative participation, described the characteristics of each group, and then compared the perceived impact of COVID-19 and the MBI-HSS results between the two groups. Results: Out of 110 eligible participants, 57 EPs completed the survey (51.8%). Thirty-five respondents completed the wellness initiative. Few (37.1%) documented their progress, though most worked with accountability partners (85.7%). Most enrollees enjoyed participation (Likert Score 3.2-5, CI 2.9-3.5) and would participate again (3.3, CI 3.0-3.6). The reported effect of the COVID-19 pandemic on mental wellbeing was lower for participants, although this was not significant (2.1, CI 1.5-2.1 vs 2.4, CI 2.0-2.7, p=0.312). On the MBI-HSS, participants had a lower emotional exhaustion score (1.4, 95% CI 0.9-1.8) than non-participants (2.2, 95%CI 1.8-2.6, p=0.005). Conclusion: Participation in a residency-led, physical wellness initiative was linked to lower emotional exhaustion for EPs during the COVID-19 pandemic

The Theory of the Interleaving Distance on Multidimensional Persistence Modules

In 2009, Chazal et al. introduced $\epsilon$-interleavings of persistence modules. $\epsilon$-interleavings induce a pseudometric $d_I$ on (isomorphism classes of) persistence modules, the interleaving distance. The definitions of $\epsilon$-interleavings and $d_I$ generalize readily to multidimensional persistence modules. In this paper, we develop the theory of multidimensional interleavings, with a view towards applications to topological data analysis. We present four main results. First, we show that on 1-D persistence modules, $d_I$ is equal to the bottleneck distance $d_B$. This result, which first appeared in an earlier preprint of this paper, has since appeared in several other places, and is now known as the isometry theorem. Second, we present a characterization of the $\epsilon$-interleaving relation on multidimensional persistence modules. This expresses transparently the sense in which two $\epsilon$-interleaved modules are algebraically similar. Third, using this characterization, we show that when we define our persistence modules over a prime field, $d_I$ satisfies a universality property. This universality result is the central result of the paper. It says that $d_I$ satisfies a stability property generalizing one which $d_B$ is known to satisfy, and that in addition, if $d$ is any other pseudometric on multidimensional persistence modules satisfying the same stability property, then $d\leq d_I$. We also show that a variant of this universality result holds for $d_B$, over arbitrary fields. Finally, we show that $d_I$ restricts to a metric on isomorphism classes of finitely presented multidimensional persistence modules.Comment: Major revision; exposition improved throughout. To appear in Foundations of Computational Mathematics. 36 page

The persistence landscape and some of its properties

Persistence landscapes map persistence diagrams into a function space, which may often be taken to be a Banach space or even a Hilbert space. In the latter case, it is a feature map and there is an associated kernel. The main advantage of this summary is that it allows one to apply tools from statistics and machine learning. Furthermore, the mapping from persistence diagrams to persistence landscapes is stable and invertible. We introduce a weighted version of the persistence landscape and define a one-parameter family of Poisson-weighted persistence landscape kernels that may be useful for learning. We also demonstrate some additional properties of the persistence landscape. First, the persistence landscape may be viewed as a tropical rational function. Second, in many cases it is possible to exactly reconstruct all of the component persistence diagrams from an average persistence landscape. It follows that the persistence landscape kernel is characteristic for certain generic empirical measures. Finally, the persistence landscape distance may be arbitrarily small compared to the interleaving distance.Comment: 18 pages, to appear in the Proceedings of the 2018 Abel Symposiu

A Genomic Pathway Approach to a Complex Disease: Axon Guidance and Parkinson Disease

While major inroads have been made in identifying the genetic causes of rare Mendelian disorders, little progress has been made in the discovery of common gene variations that predispose to complex diseases. The single gene variants that have been shown to associate reproducibly with complex diseases typically have small effect sizes or attributable risks. However, the joint actions of common gene variants within pathways may play a major role in predisposing to complex diseases (the paradigm of complex genetics). The goal of this study was to determine whether polymorphism in a candidate pathway (axon guidance) predisposed to a complex disease (Parkinson disease [PD]). We mined a whole-genome association dataset and identified single nucleotide polymorphisms (SNPs) that were within axon-guidance pathway genes. We then constructed models of axon-guidance pathway SNPs that predicted three outcomes: PD susceptibility (odds ratio = 90.8, p = 4.64 × 10−38), survival free of PD (hazards ratio = 19.0, p = 5.43 × 10−48), and PD age at onset (R2 = 0.68, p = 1.68 × 10−51). By contrast, models constructed from thousands of random selections of genomic SNPs predicted the three PD outcomes poorly. Mining of a second whole-genome association dataset and mining of an expression profiling dataset also supported a role for many axon-guidance pathway genes in PD. These findings could have important implications regarding the pathogenesis of PD. This genomic pathway approach may also offer insights into other complex diseases such as Alzheimer disease, diabetes mellitus, nicotine and alcohol dependence, and several cancers

'Education, education, education' : legal, moral and clinical

This article brings together Professor Donald Nicolson's intellectual interest in professional legal ethics and his long-standing involvement with law clinics both as an advisor at the University of Cape Town and Director of the University of Bristol Law Clinic and the University of Strathclyde Law Clinic. In this article he looks at how legal education may help start this process of character development, arguing that the best means is through student involvement in voluntary law clinics. And here he builds upon his recent article which argues for voluntary, community service oriented law clinics over those which emphasise the education of students

Neither Replication nor Simulation Supports a Role for the Axon Guidance Pathway in the Genetics of Parkinson's Disease

Susceptibility to sporadic Parkinson's disease (PD) is thought to be influenced by both genetic and environmental factors and their interaction with each other. Statistical models including multiple variants in axon guidance pathway genes have recently been purported to be capable of predicting PD risk, survival free of the disease and age at disease onset; however the specific models have not undergone independent validation. Here we tested the best proposed risk panel of 23 single nucleotide polymorphisms (SNPs) in two PD sample sets, with a total of 525 cases and 518 controls. By single marker analysis, only one marker was significantly associated with PD risk in one of our sample sets (rs6692804: P = 0.03). Multi-marker analysis using the reported model found a mild association in one sample set (two sided P = 0.049, odds ratio for each score change = 1.07) but no significance in the other (two sided P = 0.98, odds ratio = 1), a stark contrast to the reported strong association with PD risk (P = 4.64×10−38, odds ratio as high as 90.8). Following a procedure similar to that used to build the reported model, simulated multi-marker models containing SNPs from randomly chosen genes in a genome wide PD dataset produced P-values that were highly significant and indistinguishable from similar models where disease status was permuted (3.13×10−23 to 4.90×10−64), demonstrating the potential for overfitting in the model building process. Together, these results challenge the robustness of the reported panel of genetic markers to predict PD risk in particular and a role of the axon guidance pathway in PD genetics in general

Frequency and topography of cerebral microbleeds in dementia with Lewy bodies compared to Alzheimer's disease

AbstractAimTo determine the frequency and topographic distribution of cerebral microbleeds (CMBs) in dementia with Lewy bodies (DLB) in comparison to CMBs in Alzheimer disease dementia (AD).MethodsConsecutive probable DLB (n = 23) patients who underwent 3-T T2* weighted gradient-recalled-echo MRI, and age and gender matched probable Alzheimer's disease patients (n = 46) were compared for the frequency and location of CMBs.ResultsThe frequency of one or more CMBs was similar among patients with DLB (30%) and AD (24%). Highest densities of CMBs were found in the occipital lobes of patients with both DLB and AD. Patients with AD had greater densities of CMBs in the parietal, temporal lobes and infratentorial regions compared to DLB (p < 0.05).ConclusionCMBs are as common in patients with DLB as in patients with AD, with highest densities observed in the occipital lobes, suggesting common pathophysiologic mechanisms underlying CMBs in both diseases

Pre-neoplastic alterations define CLL DNA methylome and persist through disease progression and therapy

Most human cancers converge to a deregulated methylome with reduced global levels and elevated methylation at select CpG islands. To investigate the emergence and dynamics of the cancer methylome, we characterized genome-wide DNA methylation in preneoplastic monoclonal B-cell lymphocytosis (MBL) and chronic lymphocytic leukemia (CLL), including serial samples collected across disease course. We detected the aberrant tumor-associated methylation landscape at CLL diagnosis and found no significant differentially methylated regions in the high-count MBL-to-CLL transition. Patient methylomes showed remarkable stability with natural disease and posttherapy progression. Single CLL cells were consistently aberrantly methylated, indicating a homogeneous transition to the altered epigenetic state and a distinct expression profile together with MBL cells compared with normal B cells. Our longitudinal analysis reveals the cancer methylome to emerge early, which may provide a platform for subsequent genetically driven growth dynamics, and, together with its persistent presence, suggests a central role in disease onset. SigNifiCANCe: DNA methylation data from a large cohort of patients with MBL and CLL show that epigenetic transformation emerges early and persists throughout disease stages with limited subsequent changes. Our results indicate an early role for this aberrant landscape in the normal-to-preneoplastic transition that may reflect a pan-cancer mechanism