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https://www.readbyqxmd.com/read/27910987/on-the-formation-of-nitrogen-substituted-polycyclic-aromatic-hydrocarbons-npahs-in-circumstellar-and-interstellar-environments
#1
REVIEW
Dorian S N Parker, Ralf I Kaiser
The chemical evolution of extraterrestrial environments leads to the formation of polycyclic aromatic hydrocarbons (PAHs) via gas phase radical mediated aromatization reactions. We review that these de facto barrierless reactions are capable of forming prebiotic molecules such as nitrogen substituted PAHs (NPAHs), which represent the missing link between nitrogen bearing acyclic molecules and prebiotic nucleobases along with vitamins found in meteorites. Crucial routes leading to the incorporation of nitrogen atoms into the aromatic ring have been exposed...
December 2, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27910703/co-calibration-of-two-self-reported-measures-of-adherence-to-antiretroviral-therapy
#2
Robin M Nance, J A Chris Delaney, Carol E Golin, Wendee M Wechsberg, Chinazo Cunningham, Frederick Altice, Katerina Christopoulos, Kevin Knight, Vu Quan, Michael S Gordon, Sandra Springer, Jeremy Young, Paul K Crane, Kenneth H Mayer, Michael J Mugavero, Carlos Del Rio, Richard A Kronmal, Heidi M Crane
Adherence to antiretroviral therapy (ART) is an important determinant of clinical success assessed in many HIV studies. Harmonizing adherence data from studies that use different measures is difficult without a co-calibration equation to convert between validated instruments. Our purpose was to co-calibrate two commonly used adherence measures: the AIDS Clinical Trials Group (ACTG) questionnaire and the Visual Analog Scale (VAS). We used robust linear regression to develop a co-calibration equation in a clinical care cohort...
December 2, 2016: AIDS Care
https://www.readbyqxmd.com/read/27910641/real-time-energy-measurement-of-high-repetition-rate-ultrashort-laser-pulses-using-pulse-integration-and-fpga-processing
#3
Qi-Jie Tang, Dong-Xu Yang, Jian Wang, Yi Feng, Hong-Fei Zhang, Teng-Yun Chen
Real-time energy measurement using pulse integration method for high repetition rate ultrashort laser pulses based on FPGA (Field-Programmable Gate Array) and high-speed pipeline ADC (Analog-to-Digital Convertor) is introduced in this paper. There are two parts contained in this method: pulse integration and real-time data processing. The pulse integration circuit will convert the pulse to the step type signals which are linear to the laser pulse energy. Through the real-time data processing part, the amplitude of the step signals will be obtained by ADC sampling and conducting calculation in real time in FPGA...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910453/calibration-of-a-two-color-soft-x-ray-diagnostic-for-electron-temperature-measurement
#4
L M Reusch, D J Den Hartog, P Franz, J Goetz, M B McGarry, H D Stephens
The two-color soft x-ray (SXR) tomography diagnostic on the Madison Symmetric Torus is capable of making electron temperature measurements via the double-filter technique; however, there has been a 15% systematic discrepancy between the SXR double-filter (SXRDF) temperature and Thomson scattering (TS) temperature. Here we discuss calibration of the Be filters used in the SXRDF measurement using empirical measurements of the transmission function versus energy at the BESSY II electron storage ring, electron microprobe analysis of filter contaminants, and measurement of the effective density...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910404/using-a-priori-knowledge-for-developing-bolometric-tomography-in-toroidal-devices
#5
Ryuichi Sano, Byron J Peterson, Kiyofumi Mukai, Masaru Teranishi, Naofumi Iwama, Masahiro Kobayashi
In tomographic imaging of magnetically confined toroidal plasmas, a countermeasure against missing observation has been studied in terms of the adoption of prior information based on modelled plasma profiles. The Tikhonov regularization for image reconstruction is extended by the use of the Euclidean distance. A procedure of model fitting is designed in order to adaptively generate the reference image. The new method is tested on a typical example of ill-conditioned tomography, that is, the three-dimensional imaging-bolometer tomography in the large helical device...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910217/disentangling-estimands-and-the-intention-to-treat-principle
#6
Ann-Kristin Leuchs, Andreas Brandt, Jörg Zinserling, Norbert Benda
Randomized controlled trials (RCTs) aim at providing reliable estimates of treatment benefit. Missing data and nonadherence to treatment are distinct problems that can substantially impede this task. In practice, the fact that the handling of missing data due to nonadherence affects the question that is addressed is often ignored. Estimands allow precisely predefining the question of interest. Estimands are definitions of that which is being estimated with regard to population, endpoint, and handling of postrandomization events (eg, nonadherence)...
December 2, 2016: Pharmaceutical Statistics
https://www.readbyqxmd.com/read/27909801/increasing-the-sensitivity-of-mri-for-the-detection-of-multiple-sclerosis-lesions-by-long-axial-coverage-of-the-spinal-cord-a-prospective-study-in-119-patients
#7
Michael O Breckwoldt, Johann Gradl, Stefan Hähnel, Thomas Hielscher, Brigitte Wildemann, Ricarda Diem, Michael Platten, Wolfgang Wick, Sabine Heiland, Martin Bendszus
Diagnostic imaging criteria of multiple sclerosis (MS) include the spatial and temporal dissemination of cerebral and/or spinal cord lesions. Magnetic resonance imaging (MRI) is the method of choice for initial diagnosis and follow-up disease monitoring. Current guidelines for spinal MRI recommend sagittal imaging of the spinal cord and lesion confirmation on axial planes if lesions are detected. Sagittal imaging is, however, hampered by technical (e.g. partial volume effects, motion artifacts) and anatomical (e...
December 1, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27909463/synthetic-nanoparticles-for-delivery-of-radioisotopes-and-radiosensitizers-in-cancer-therapy
#8
REVIEW
Jun Zhao, Min Zhou, Chun Li
Radiotherapy has been, and will continue to be, a critical modality to treat cancer. Since the discovery of radiation-induced cytotoxicity in the late 19th century, both external and internal radiation sources have provided tremendous benefits to extend the life of cancer patients. Despite the dramatic improvement of radiation techniques, however, one challenge persists to limit the anti-tumor efficacy of radiotherapy, which is to maximize the deposited dose in tumor while sparing the rest of the healthy vital organs...
2016: Cancer Nanotechnology
https://www.readbyqxmd.com/read/27909379/-it-is-an-eye-opener-that-there-is-a-relationship-between-rehabilitation-and-hiv-perspectives-of-physiotherapists-and-occupational-therapists-in-kenya-and-zambia-on-the-role-of-rehabilitation-with-adults-and-children-living-with-hiv
#9
Stephanie Nixon, Cathy Cameron, Margaret Mweshi, Esther Munalula Nkandu, Carlius Okidi, Stephen Tattle, Tammy Yates
Purpose: To present the perspectives of rehabilitation providers-physiotherapists and occupational therapists-in Kenya and Zambia on the role of rehabilitation in the care of adults and children living with HIV. Methods: This qualitative, interpretivist study was part of a broader project to adapt a Canadian e-module on HIV-related disability for rehabilitation providers in Sub-Saharan Africa (SSA). Focus groups, demographic questionnaires, and knowledge-attitude-belief surveys were conducted with rehabilitation providers in Kenya and Zambia...
2016: Physiotherapy Canada. Physiothérapie Canada
https://www.readbyqxmd.com/read/27909221/factors-related-to-diffuse-large-b-cell-lymphoma-relative-survival-in-a-population-based-study-in-france-is-there-a-role-of-socio-economic-status
#10
Sandra Le Guyader-Peyrou, Sebastien Orazio, Olivier Dejardin, Marc Maynadie, Xavier Troussard, Alain Monnereau
Due to addition of anti-CD20 to anthracycline-based chemotherapy, survival of diffuse large B-cell lymphoma increased during the last decade. Although these trends are encouraging, there are still persistent differences in survival within and between US and European countries suggesting the role of non-biological factors. Our aim was to investigate the influence of such factors on relative survival of diffuse large B-cell lymphoma patients. We conducted a retrospective multicenter registry-based study in France, between 2002 and 2008, on 1165 incident cases of diffuse large B-cell lymphoma Relative survival analyses were performed and data missing were controlled with multiple imputation method...
December 1, 2016: Haematologica
https://www.readbyqxmd.com/read/27909127/costs-quality-of-life-and-cost-effectiveness-of-arthroscopic-and-open-repair-for-rotator-cuff-tears-an-economic-evaluation-alongside-the-ukuff-trial
#11
J Murphy, A Gray, C Cooper, D Cooper, C Ramsay, A Carr
AIMS: A trial-based comparison of the use of resources, costs and quality of life outcomes of arthroscopic and open surgical management for rotator cuff tears in the United Kingdom NHS was performed using data from the United Kingdom Rotator Cuff Study (UKUFF) randomised controlled trial. PATIENTS AND METHODS: Using data from 273 patients, healthcare-related use of resources, costs and quality-adjusted life years (QALYs) were estimated at 12 months and 24 months after surgery on an intention-to-treat basis with adjustment for covariates...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27908555/dental-pathology-of-the-hoary-marmot-marmota-caligata-groundhog-marmota-monax-and-alaska-marmot-marmota-broweri
#12
J N Winer, B Arzi, D M Leale, P H Kass, F J M Verstraete
Museum specimens (maxillae and mandibles) of the three marmot species occurring in Alaska (Marmota caligata [n = 108 specimens], Marmota monax [n = 30] and Marmota broweri [n = 24]) were examined macroscopically according to predefined criteria. There were 71 specimens (43.8%) from female animals, 69 (42.6%) from male animals and 22 (13.6%) from animals of unknown sex. The ages of animals ranged from neonatal to adult, with 121 young adults (74.4%) and 41 adults (25.3%) included, and 168 excluded from study due to neonatal/juvenile age or incompleteness of specimens (missing part of the dentition)...
November 28, 2016: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/27908536/the-sensitivity-and-negative-predictive-value-of-a-pediatric-cervical-spine-clearance-algorithm-that-minimizes-computerized-tomography
#13
Mary Arbuthnot, David P Mooney
BACKGROUND: It is crucial to identify cervical spine injuries while minimizing ionizing radiation. This study analyzes the sensitivity and negative predictive value of a pediatric cervical spine clearance algorithm. METHODS: We performed a retrospective review of all children <21years old who were admitted following blunt trauma and underwent cervical spine clearance utilizing our institution's cervical spine clearance algorithm over a 10-year period. Age, gender, International Classification of Diseases 9th Edition diagnosis codes, presence or absence of cervical collar on arrival, Injury Severity Score, and type of cervical spine imaging obtained were extracted from the trauma registry and electronic medical record...
October 27, 2016: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/27908435/antimicrobial-stewardship-programs-that-target-only-high-cost-broad-spectrum-antimicrobials-miss-opportunities-to-reduce-clostridium-difficile-infections
#14
Christine Bui, Elizabeth Zhu, Monica A Donnelley, Machelle D Wilson, Margaret Morita, Stuart H Cohen, Jennifer Brown
Antimicrobial stewardship programs are promoted as a strategy to reduce Clostridium difficile infections. We implemented an antimicrobial stewardship program comprised of formulary restriction plus prospective audit with feedback for high-cost and broad-spectrum antimicrobials. Subsequently, we reviewed all heath care facility-onset, health care facility-associated C difficile infections. We found that most of these infections were associated with the antecedent receipt of nonaudited, and often unnecessary, antimicrobials...
December 1, 2016: American Journal of Infection Control
https://www.readbyqxmd.com/read/27908413/trace-element-and-cytokine-concentrations-in-patients-with-fibrodysplasia-ossificans-progressiva-fop-a-case-control-study
#15
Laura Hildebrand, Timo Gaber, Peter Kühnen, Rolf Morhart, Heinz Unterbörsch, Lutz Schomburg, Petra Seemann
Fibrodysplasia Ossificans Progressiva (FOP) is a rare inherited disease characterized by progressive heterotopic ossification. Disease onset, severity and symptoms vary between FOP patients, as does the frequency and activity of so-called flare-ups, during which tendons, ligaments, muscle and soft tissue are replaced by bone. Traumata, infections or other stressors are known inducers of flare-ups, and the hormone Activin A may be involved in disease activity; however, reliable biomarkers for FOP activity are missing, and the basal trace element and inflammatory state of patients are unknown...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27908353/the-risk-continuum-of-atherosclerosis-and%C3%A2-its-implications-for-defining-chd-by%C3%A2-coronary-angiography
#16
REVIEW
Armin Arbab-Zadeh, Valentin Fuster
Patients undergoing coronary angiography for suspected coronary heart disease who are found to have coronary atherosclerotic disease with <50% diameter stenosis may carry a risk of adverse cardiac events similar to that in patients with single-vessel obstructive disease. Yet clinical practice guidelines offer no direction for managing symptomatic patients with nonobstructive coronary atherosclerosis because current diagnostic criteria for coronary heart disease are not met. Accordingly, secondary preventive measures are not endorsed, and their role is not defined in this setting...
December 6, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27908233/procedure-for-purification-of-recombinant-premsk1p-from-e-coli-determines-its-properties-as-a-factor-of-trna-import-into-yeast-mitochondria
#17
E V Smirnova, I V Chicherin, M V Baleva, N S Entelis, I A Tarassov, P A Kamenski
Mitochondrial genomes of many eukaryotic organisms do not code for the full tRNA set necessary for organellar translation. Missing tRNA species are imported from the cytosol. In particular, one out of two cytosolic lysine tRNAs of the yeast Saccharomyces cerevisiae is partially internalized by mitochondria. The key protein factor of this process is the precursor of mitochondrial lysyl-tRNA synthetase, preMsk1p. In this work, we show that recombinant preMsk1p purified from E. coli in native conditions, when used in an in vitro tRNA import system, demonstrates some properties different from those shown by the renatured protein purified from E...
October 2016: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/27908214/pregnancy-and-tumor-outcomes-in-infertile-women-with-macroprolactinoma-on-cabergoline-therapy
#18
Ashu Rastogi, Sanjay K Bhadada, Anil Bhansali
Hyperprolactinemia and prolactinomas cause infertility in significant number of women. But, pregnancy may lead to post-partum remission of hyperprolactinemia. The data on pregnancy and tumor outcome in women with macroprolactinoma conceiving on Cabergoline (CAB) therapy is increasing but still less than with Bromocriptine. We studied the incidence of fetal malformations, hyperprolactinemia and tumor course after gestation in infertile women harboring macroprolactinoma, who conceived on CAB therapy during the year 2005-2015...
December 2, 2016: Gynecological Endocrinology
https://www.readbyqxmd.com/read/27908181/defining-and-assessing-an-anisotropic-delineation-margin-for-modern-radiotherapy
#19
L R Bell, E M Pogson, P E Metcalfe, L C Holloway
PURPOSE: Uncertainty in target volume delineation for modern radiotherapy impacts dosimetry and patient outcomes. Delineation uncertainty is generally overlooked in practice as a source of error, potentially since historically, other uncertainties have been the main focus. This work defined and assessed an anisotropic delineation margin in both polar and spherical coordinate systems in order to account for the spatially varying nature of this uncertainty using a whole breast radiotherapy cohort as a proof of concept...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908178/a-probability-based-multi-cycle-sorting-method-for-4d-mri-a-simulation-study
#20
Xiao Liang, Fang-Fang Yin, Yilin Liu, Jing Cai
PURPOSE: To develop a novel probability-based sorting method capable of generating multiple breathing cycles of 4D-MRI images and to evaluate performance of this new method by comparing with conventional phase-based methods in terms of image quality and tumor motion measurement. METHODS: Based on previous findings that breathing motion probability density function (PDF) of a single breathing cycle is dramatically different from true stabilized PDF that resulted from many breathing cycles, it is expected that a probability-based sorting method capable of generating multiple breathing cycles of 4D images may capture breathing variation information missing from conventional single-cycle sorting methods...
December 2016: Medical Physics
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