303 research outputs found

    Towards Designing an Integrated Architecture for NEO Characterization, Mitigation, Scientific Evaluation, and Resource Utilization

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    This poster reviews the planning and design for an integrated architecture for characterization, mitigation, scientific evaluation and resource utilization of near earth objects. This includes tracks to observe and characterize the nature of the threat posed by a NEO, and deflect if a significant threat is posed. The observation stack can also be used for a more complete scientific analysis of the NEO

    Aquarium microbiome response to ninety-percent system water change : clues to microbiome management

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    Author Posting. © John Wiley & Sons, 2015. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Zoo Biology 34 (2015): 360-367, doi:10.1002/zoo.21220.The bacterial community composition and structure of water from an established teleost fish system was examined before, during and after a major water change to explore the impact of such a water-change disturbance on the stability of the aquarium water microbiome. The diversity and evenness of the bacterial community significantly increased following the 90% water replacement. While the change in bacterial community structure was significant, it was slight, and was also weakly correlated with changes in physicochemical parameters. Interestingly there was a significant shift in the correlative network relationships between operational taxonomic units from before to after the water replacement. We suggest this shift in network structure is due to the turnover of many taxa during the course of water replacement. These observations will inform future studies into manipulation of the microbiome by changing system environmental parameter values to optimize resident animal health.Sean Gibbons was supported by an EPA STAR Graduate Fellowship.2016-05-2

    The impact of non-equilibrium flow on the structure of turbulence over river dunes

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    This piece of research expands our description of how rivers flow over dunes on a river bed. Most of the scientific communities' research to date has used unnaturally steady conditions to measure how water moves over dunes. Yet these flow conditions are not strictly true to the variety of conditions nature produces, most importantly during floods. This research is the first detailed description of a wide range of flow states over dunes, and changes our present understanding of the structure of flow over dunes in rivers. Consequently, the scientific community will be able to use this new information to better model and simulate how rivers work, how they flood, and how they transport sediment towards the worlds deltas

    Performance of prototypes for the ALICE electromagnetic calorimeter

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    The performance of prototypes for the ALICE electromagnetic sampling calorimeter has been studied in test beam measurements at FNAL and CERN. A 4×44\times4 array of final design modules showed an energy resolution of about 11% /E(GeV)\sqrt{E(\mathrm{GeV})} \oplus 1.7 % with a uniformity of the response to electrons of 1% and a good linearity in the energy range from 10 to 100 GeV. The electromagnetic shower position resolution was found to be described by 1.5 mm \oplus 5.3 mm /E(GeV)\sqrt{E \mathrm{(GeV)}}. For an electron identification efficiency of 90% a hadron rejection factor of >600>600 was obtained.Comment: 10 pages, 10 figure

    Caracterización de la fibrilación auricular y riesgo tromboembólico en pacientes del Hospital León Cuervo Rubio

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    Introduction: among cardiac pathologies, atrial fibrillation is related to a high incidence of thromboembolic diseases. Objective: to clinically and epidemiologically characterize atrial fibrillation and thromboembolic risk in patients attended at the León Cuervo Rubio Hospital in Pinar del Río between 2017 and 2019. Methods: an observational, descriptive, cross-sectional, descriptive study was conducted on patients with atrial fibrillation attended at the León Cuervo Rubio Hospital in Pinar del Río from 2017 to 2019. The study universe consisted of 198 patients diagnosed with atrial arrhythmias in that hospital, the sample was constituted by 68 patients who met the inclusion and exclusion criteria. Results: female sex predominated (58.8%). The most representative age group was 75 to 85 years old (45.5 %). Some type of heart disease associated with atrial fibrillation was present in 69.1% of patients. Persistent atrial fibrillation predominated (35.2%). Palpitations predominated as symptoms of atrial fibrillation (91.1%). Most patients with atrial fibrillation were in the moderate thromboembolic risk category (66.1%). Conclusions: the predominant sex was female, the most affected age group was over 85 years, ischemic heart disease was the most prevalent history, persistent atrial fibrillation was the most frequent, palpitations were the main symptom, and according to the thromboembolic risk category, most patients were at moderate risk.Introducción: dentro de las patologías cardiacas, la fibrilación auricular se relaciona con una alta incidencia de enfermedades tromboembólicas. Objetivo: caracterizar clínica y epidemiológicamente la fibrilación auricular y el riesgo tromboembólico en pacientes atendidos en el Hospital León Cuervo Rubio de Pinar del Río entre 2017 y 2019. Método: se realizó un estudio observacional, descriptivo, de corte transversal a pacientes con fibrilación auricular atendidos en el Hospital León Cuervo Rubio de Pinar del Río de 2017 a 2019. El universo de estudio estuvo conformado por 198 pacientes con diagnóstico de arritmias auriculares en dicho hospital, la muestra quedó constituida por 68 pacientes que cumplieron con los criterios de inclusión y exclusión. Resultados: predominó el sexo femenino (58,8 %). El grupo etario más representativo fue el de 75 a 85 años (45,5 %). El 69,1 % presentaban algún tipo de cardiopatía asociada a la fibrilación auricular. Predominó la fibrilación auricular de tipo persistente (35,2 %). Predominaron las palpitaciones como síntomas de la fibrilación auricular (91,1 %). La mayoría de los pacientes con fibrilación auricular estaban en la categoría de riesgo tromboembólico moderado (66,1 %). Conclusiones: el sexo que predominó fue el femenino, el grupo etáreo más afectado fue el de más de 85 años, la cardiopatía isquémica fue el antecedente de mayor prevalencia, la fibrilación auricular de tipo persistente fue la más frecuente, las palpitaciones constituyeron el síntoma principal y según la categoría de riesgo tromboembólico la mayoría de los pacientes presentaban riesgo moderado

    Trends in publications regarding evidence-practice gaps: A literature review

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    <p>Abstract</p> <p>Background</p> <p>Well-designed trials of strategies to improve adherence to clinical practice guidelines are needed to close persistent evidence-practice gaps. We studied how the number of these trials is changing with time, and to what extent physicians are participating in such trials.</p> <p>Methods</p> <p>This is a literature-based study of trends in evidence-practice gap publications over 10 years and participation of clinicians in intervention trials to narrow evidence-practice gaps. We chose nine evidence-based guidelines and identified relevant publications in the PubMed database from January 1998 to December 2007. We coded these publications by study type (intervention versus non-intervention studies). We further subdivided intervention studies into those for clinicians and those for patients. Data were analyzed to determine if observed trends were statistically significant.</p> <p>Results</p> <p>We identified 1,151 publications that discussed evidence-practice gaps in nine topic areas. There were 169 intervention studies that were designed to improve adherence to well-established clinical guidelines, averaging 1.9 studies per year per topic area. Twenty-eight publications (34%; 95% CI: 24% - 45%) reported interventions intended for clinicians or health systems that met Effective Practice and Organization of Care (EPOC) criteria for adequate design. The median consent rate of physicians asked to participate in these well-designed studies was 60% (95% CI, 25% to 69%).</p> <p>Conclusions</p> <p>We evaluated research publications for nine evidence-practice gaps, and identified small numbers of well-designed intervention trials and low rates of physician participation in these trials.</p

    Laser-directed hierarchical assembly of liquid crystal defects and control of optical phase singularities

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    Topological defect lines are ubiquitous and important in a wide variety of fascinating phenomena and theories in many fields ranging from materials science to early-universe cosmology, and to engineering of laser beams. However, they are typically hard to control in a reliable manner. Here we describe facile erasable “optical drawing” of self-assembled defect clusters in liquid crystals. These quadrupolar defect clusters, stabilized by the medium's chirality and the tendency to form twisted configurations, are shaped into arbitrary two-dimensional patterns, including reconfigurable phase gratings capable of generating and controlling optical phase singularities in laser beams. Our findings bridge the studies of defects in condensed matter physics and optics and may enable applications in data storage, singular optics, displays, electro-optic devices, diffraction gratings, as well as in both optically- and electrically-addressed pixel-free spatial light modulators

    Morphological and Physiological Responses to Drought Stress of European Provenances of Scots Pine

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    Increased frequency and intensity of drought episodes as a consequence of current and predicted climatic changes require an understanding of the intra-specific variability in structural and physiological characteristics of forest trees. Adaptive plasticity and genotypic variability are considered two of the main processes by which trees can either be selected or can acclimate to changing conditions. We tested for the relative importance of genotypic variability, phenotypic plasticity and their interaction by comparing the growth and physiological performance of 15 provenances of Scots pine (Pinus sylvestris L.), under two contrasting irrigation regimes. Selected provenances representing the distribution range of the species in Anatolia, Turkey, were contrasted with seed sources spanning the range from Spain to the UK, in Europe. We found a strong latitudinal differentiation among the 15 provenances for survival after drought, largely the result of the higher mortality of some western and central European provenances. Differentiation in diameter and height growth was also clear with the worst provenance coming from Western Europe (UK). Among the Turkish provenances, the more extreme southern high-elevation populations showed greater survival and lower growth rates overall. Differences in growth and survival were related to differences in photosynthetic pigment and nutrient contents and in the photosynthetic efficiency of photosystem II. Plasticity was strongest for growth characters and pigment contents.WoSScopu

    Neuroanatomical Study of the A11 Diencephalospinal Pathway in the Non-Human Primate

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    BACKGROUND: The A11 diencephalospinal pathway is crucial for sensorimotor integration and pain control at the spinal cord level. When disrupted, it is thought to be involved in numerous painful conditions such as restless legs syndrome and migraine. Its anatomical organization, however, remains largely unknown in the non-human primate (NHP). We therefore characterized the anatomy of this pathway in the NHP. METHODS AND FINDINGS: In situ hybridization of spinal dopamine receptors showed that D1 receptor mRNA is absent while D2 and D5 receptor mRNAs are mainly expressed in the dorsal horn and D3 receptor mRNA in both the dorsal and ventral horns. Unilateral injections of the retrograde tracer Fluoro-Gold (FG) into the cervical spinal enlargement labeled A11 hypothalamic neurons quasi-exclusively among dopamine areas. Detailed immunohistochemical analysis suggested that these FG-labeled A11 neurons are tyrosine hydroxylase-positive but dopa-decarboxylase and dopamine transporter-negative, suggestive of a L-DOPAergic nucleus. Stereological cell count of A11 neurons revealed that this group is composed by 4002±501 neurons per side. A 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) intoxication with subsequent development of a parkinsonian syndrome produced a 50% neuronal cell loss in the A11 group. CONCLUSION: The diencephalic A11 area could be the major source of L-DOPA in the NHP spinal cord, where it may play a role in the modulation of sensorimotor integration through D2 and D3 receptors either directly or indirectly via dopamine formation in spinal dopa-decarboxylase-positives cells
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