Istanbul University

About: Istanbul University is a education organization based out in Istanbul, Turkey. It is known for research contribution in the topics: Population & Medicine. The organization has 19050 authors who have published 38464 publications receiving 727640 citations. The organization is also known as: İstanbul Üniversitesi & University of Istanbul.

The Dense Matter Equation of State from Neutron Star Radius and Mass Measurements

Abstract: We present a comprehensive study of spectroscopic radius measurements of twelve neutron stars obtained during thermonuclear bursts or in quiescence. We incorporate, for the first time, a large number of systematic uncertainties in the measurement of the apparent angular sizes, Eddington fluxes, and distances, in the composition of the interstellar medium, and in the flux calibration of X-ray detectors. We also take into account the results of recent theoretical calculations of rotational effects on neutron star radii, of atmospheric effects on surface spectra, and of relativistic corrections to the Eddington critical flux. We employ Bayesian statistical frameworks to obtain neutron star radii from the spectroscopic measurements as well as to infer the equation of state from the radius measurements. Combining these with the results of experiments in the vicinity of nuclear saturation density and the observations of ∼ 2 M⊙ neutron stars, we place strong and quantitative constraints on the properties of the equation of state between ≈ 2 − 8 times the nuclear saturation density. We find that around M = 1.5 M⊙, the preferred equation of state predicts a radius of 10.8 +0.5 −0.4 km. When interpreting the pressure constraints in the context of high density equations of state based on interacting nucleons, our results suggest a weaker contribution of the three-body interaction potential than previously considered. Subject headings: dense matter — equation of state — stars:neutron — X-rays:stars — X-rays:bursts — X-rays:binaries

Guideline for the Management of Fever and Neutropenia in Children With Cancer and/or Undergoing Hematopoietic Stem-Cell Transplantation

Abstract: Purpose To develop an evidence-based guideline for the empiric management of pediatric fever and neutropenia (FN). Methods The International Pediatric Fever and Neutropenia Guideline Panel is a multidisciplinary and multinational group composed of experts in pediatric oncology and infectious disease as well as a patient advocate. The Panel was convened for the purpose of creating this guideline. We followed previously validated procedures for creating evidence-based guidelines. Working groups focused on initial presentation, ongoing management, and empiric antifungal therapy. Each working group developed key clinical questions, conducted systematic reviews of the published literature, and compiled evidence summaries. The Grades of Recommendation Assessment, Development, and Evaluation approach was used to generate summaries, and evidence was classified as high, moderate, low, or very low based on methodologic considerations. Results Recommendations were made related to initial presentation (risk stratification, initial evaluation, and treatment), ongoing management (modification and cessation of empiric antibiotics), and empiric antifungal treatment (risk stratification, evaluation, and treatment) of pediatric FN. For each recommendation, the strength of the recommendation and level of evidence are presented. Conclusion This guideline represents an evidence-based approach to FN specific to children with cancer. Although some recommendations are similar to adult-based guidelines, there are key distinctions in multiple areas. Implementation will require adaptation to the local context.