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https://www.readbyqxmd.com/read/29342315/oxidation-of-methylalumoxane-oligomers
#1
Harmen Zijlstra, Scott Collins, Jason Scott McIndoe
The anions formed from methylalumoxane (MAO) and suitable donors (e.g. octamethyltrisiloxane) are amenable to mass spectrometric (MS) analysis. Their composition as deduced from this data allows direct insight into the chemical transformations of their neutral precursors. One such process is oxidation, which is well-known to be facile for MAO without any clear idea of what actually occurs at a molecular level. Addition of O2 to MAO results in immediate gelation, but MS analysis reveals no corresponding change to the composition of the principal oligomeric anions...
January 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29342302/determination-of-the-appropriate-physical-density-of-internal-metallic-ports-in-temporary-tissue-expanders-for-the-treatment-planning-of-post-mastectomy-radiation-therapy
#2
Norifumi Mizuno, Haruna Takahashi, Jiro Kawamori, Naoki Nakamura, Mami Ogita, Shogo Hatanaka, Ryouhei Yamauchi, Masatsugu Hariu, Kenji Sekiguchi
Some patients undergoing breast reconstruction require post-mastectomy radiation therapy, but the metallic ports used in temporary tissue expanders attenuate the X-rays. In this study, we evaluated by the film method, the attenuation of 4 MV and 6 MV X-rays after passing through a metallic port, with the aim of identifying a useful method for determining the appropriate density to use in the radiation treatment planning system (RTPS), taking into account the distance between the metallic port and the targets...
January 12, 2018: Journal of Radiation Research
https://www.readbyqxmd.com/read/29342226/don-t-judge-a-book-by-its-cover-examiner-expectancy-effects-predict-neuropsychological-performance-for-individuals-judged-as-chronic-cannabis-users
#3
Louise M Sodos, Rayna B Hirst, Jessica Watson, Dylan Vaughn
Objective: The experimenter expectancy effect confound remains largely unexplored in neuropsychological research and has never been investigated among cannabis users. This study investigated whether examiner expectancies of cannabis user status affected examinees' neuropsychological performance. Method: Participants included 41 cannabis users and 20 non-users. Before testing, examiners who were blind to participant user status privately rated whether they believed the examinee was a cannabis user or non-user...
January 12, 2018: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/29342146/a-theory-of-how-active-behavior-stabilises-neural-activity-neural-gain-modulation-by-closed-loop-environmental-feedback
#4
Christopher L Buckley, Taro Toyoizumi
During active behaviours like running, swimming, whisking or sniffing, motor actions shape sensory input and sensory percepts guide future motor commands. Ongoing cycles of sensory and motor processing constitute a closed-loop feedback system which is central to motor control and, it has been argued, for perceptual processes. This closed-loop feedback is mediated by brainwide neural circuits but how the presence of feedback signals impacts on the dynamics and function of neurons is not well understood. Here we present a simple theory suggesting that closed-loop feedback between the brain/body/environment can modulate neural gain and, consequently, change endogenous neural fluctuations and responses to sensory input...
January 17, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29342080/comparisons-of-different-models-on-dynamic-recrystallization-of-plate-during-asymmetrical-shear-rolling
#5
Tao Zhang, Lei Li, Shi-Hong Lu, Hai Gong, Yun-Xin Wu
Asymmetrical shear rolling with velocity asymmetry and geometry asymmetry is beneficial to enlarge deformation and refine grain size at the center of the thick plate compared to conventional symmetrical rolling. Dynamic recrystallization (DRX) plays a vital role in grain refinement during hot deformation. Finite element models (FEM) coupled with microstructure evolution models and cellular automata models (CA) are established to study the microstructure evolution of plate during asymmetrical shear rolling. The results show that a larger DRX fraction and a smaller average grain size can be obtained at the lower layer of the plate...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29342043/the-american-otological-society-at-its-sesquicentennial-insights-into-the-society-s-formative-years
#6
Robert K Jackler, Jennifer C Alyono, Albert C Mudry
OBJECTIVE: To elucidate the sequence of events which led to the formation of the American Otological Society (AOS) in 1868 and to examine the lives and contributions of the nine founding members of the Society. METHODS: Study of primary historical documents, biographical material, and previous histories of the AOS. RESULTS: Earlier treatments of the history of the AOS minimally covered the events and personalities from the Society's formative period...
January 16, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29341688/what-randomized-benchmarking-actually-measures
#7
Timothy Proctor, Kenneth Rudinger, Kevin Young, Mohan Sarovar, Robin Blume-Kohout
Randomized benchmarking (RB) is widely used to measure an error rate of a set of quantum gates, by performing random circuits that would do nothing if the gates were perfect. In the limit of no finite-sampling error, the exponential decay rate of the observable survival probabilities, versus circuit length, yields a single error metric r. For Clifford gates with arbitrary small errors described by process matrices, r was believed to reliably correspond to the mean, over all Clifford gates, of the average gate infidelity between the imperfect gates and their ideal counterparts...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341639/enhanced-second-order-nonlinearity-for-thz-generation-by-resonant-interaction-of-exciton-polariton-rabi-oscillations-with-optical-phonons
#8
Katharina Rojan, Yoan Léger, Giovanna Morigi, Maxime Richard, Anna Minguzzi
Semiconductor microcavities in the strong-coupling regime exhibit an energy scale in the terahertz (THz) frequency range, which is fixed by the Rabi splitting between the upper and lower exciton-polariton states. While this range can be tuned by several orders of magnitude using different excitonic media, the transition between both polaritonic states is dipole forbidden. In this work, we show that, in cadmium telluride microcavities, the Rabi-oscillation-driven THz radiation is actually active without the need for any change in the microcavity design...
September 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341237/the-impact-of-diuretic-use-and-abcg2-genotype-on-the-predictive-performance-of-a-published-allopurinol-dosing-tool
#9
Daniel F B Wright, Nicola Dalbeth, Amanda J Phipps-Green, Tony R Merriman, Murray L Barclay, Jill Drake, Paul Tan, Anne Horne, Lisa K Stamp
This research aims to evaluate the predictive performance of a published allopurinol dosing tool. Allopurinol dose predictions were compared to the actual dose required to achieve serum urate (SU) <0.36 mmol L-1 using mean prediction error. The influence of patient factors on dose predictions was explored using multilinear regression. Allopurinol doses were over-predicted by the dosing tool, however, this was minimal in patients without diuretic therapy (MPE 63mg day-1 , 95%CI 40-87) compared to those receiving diuretics (MPE 295mg day-1 , 95%CI 260-330, p<0...
January 17, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29341236/induced-earthquakes-from-long-term-gas-extraction-in-groningen-the-netherlands-statistical-analysis-and-prognosis-for-acceptable-risk-regulation
#10
Charles Vlek
Recently, growing earthquake activity in the northeastern Netherlands has aroused considerable concern among the 600,000 provincial inhabitants. There, at 3 km deep, the rich Groningen gas field extends over 900 km2 and still contains about 600 of the original 2,800 billion cubic meters (bcm). Particularly after 2001, earthquakes have increased in number, magnitude (M, on the logarithmic Richter scale), and damage to numerous buildings. The man-made nature of extraction-induced earthquakes challenges static notions of risk, complicates formal risk assessment, and questions familiar conceptions of acceptable risk...
January 16, 2018: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/29341103/an-overview-of-confounding-part-1-the-concept-and-how-to-address-it
#11
Penelope P Howards
Confounding is an important source of bias, but it is often misunderstood. We consider how confounding occurs and how to address confounding using examples. Study results are confounded when the exposure's effect on the outcome mixes with the effects of other risk and protective factors for the outcome. This problem arises when these factors are present to different degrees among the exposed and unexposed study participants, but not all differences between the groups result in confounding. Thinking about an ideal study where all of the population of interest is exposed in one universe and is unexposed in a parallel universe helps to distinguish confounders from other differences...
January 17, 2018: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/29341101/an-overview-of-confounding-part-2-how-to-identify-it-and-special-situations
#12
Penelope P Howards
Confounding biases study results when the exposure's effect on the outcome mixes with the effects of other risk and protective factors for the outcome that are present differentially by exposure status. However, not all differences between the exposed and unexposed group cause confounding. Thus, sources of confounding must be identified before they can be addressed. Confounding is absent in an ideal study where all of the population of interest is exposed in one universe and is unexposed in a parallel universe...
January 17, 2018: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/29341054/-a-relational-ethical-model-for-the-assessment-of-decision-making-competence-in-psychiatry
#13
A Liégeois
Nowadays, partly due to legislation, decision-making competence is playing an ever-increasing role in psychiatry. So far, however, there are no clear criteria for evaluating the actual competence of the procedure.<br/> AIM: To develop a relational ethical model, including criteria and methodology, which can be used to assess and enhance decision-making competence mainly from a relational and ethical perspective.<br/> METHOD: Combination of a review of the literature and ethical reflection. First of all, a limited study was made of the literature relating to the concept of and criteria for decision-making competence...
2018: Tijdschrift Voor Psychiatrie
https://www.readbyqxmd.com/read/29340967/testing-the-actual-equivalence-of-automatically-generated-items
#14
Debora de Chiusole, Luca Stefanutti, Pasquale Anselmi, Egidio Robusto
If the automatic item generation is used for generating test items, the question of how the equivalence among different instances may be tested is fundamental to assure an accurate assessment. In the present research, the question was dealt by using the knowledge space theory framework. Two different ways of considering the equivalence among instances are proposed: The former is at a deterministic level and it requires that all the instances of an item template must belong to exactly the same knowledge states; the latter adds a probabilistic level to the deterministic one...
January 16, 2018: Behavior Research Methods
https://www.readbyqxmd.com/read/29340848/validation-of-the-korean-munich-chronotype-questionnaire
#15
Sooyeon Suh, Soo Hyun Kim, Hyera Ryu, Su Jung Choi, Eun Yeon Joo
PURPOSE: The Munich Chronotype Questionnaire (MCTQ) assesses actual sleep-wake timing and has advantages compared to prior chronotype questionnaires in that it differentiates sleep-wake patterns between work days and free days and uses corrected mid-sleep time on free days after correcting for accumulated sleep debt over the week to categorize chronotype. The current study, we validated the Korean version of the MCTQ. METHODS: In this study, 310 participants (mean age = 27...
January 16, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29340526/simulating-the-behavior-of-patients-who-leave-a-public-hospital-emergency-department-without-being-seen-by-a-physician-a-cellular-automaton-and-agent-based-framework
#16
Milad Yousefi, Moslem Yousefi, F S Fogliatto, R P M Ferreira, J H Kim
The objective of this study was to develop an agent based modeling (ABM) framework to simulate the behavior of patients who leave a public hospital emergency department (ED) without being seen (LWBS). In doing so, the study complements computer modeling and cellular automata (CA) techniques to simulate the behavior of patients in an ED. After verifying and validating the model by comparing it with data from a real case study, the significance of four preventive policies including increasing number of triage nurses, fast-track treatment, increasing the waiting room capacity and reducing treatment time were investigated by utilizing ordinary least squares regression...
January 11, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29340511/-a-critical-examination-of-public-policies-related-to-indigenous-health-traditional-medicine-and-interculturality-in-mexico-1990-2016
#17
Roberto Campos Navarro, Edith Yesenia Peña Sánchez, Alfredo Paulo Maya
Over the last 26 years, the Mexican government has developed a number of activities and discourses around what has been called "intercultural health," directed especially at indigenous peoples in Mexico (some 62, according to linguistic criteria). In this way, the government has built health care institutions (rural centers, clinics, and hospitals) in states like Puebla, Nayarit, Oaxaca, Chiapas, Queretaro, and Jalisco, proposing the implementation of cultural pertinence indicators (which are minimal and inadequate)...
July 2017: Salud Colectiva
https://www.readbyqxmd.com/read/29340379/enhanced-photocatalytic-efficiency-of-c3n4-bifeo3-heterojunctions-the-synergistic-effects-of-band-alignment-and-ferroelectricity
#18
Xian-Zhu Deng, Chuang Song, Yin-Lin Tong, Guoliang Yuan, Feng Gao, Dan-Qing Liu, Shan-Tao Zhang
As one of the most promising photocatalysts, graphitic carbon nitride (g-C3N4) shows a visible light response and great chemical stability. However, its relatively low photocatalytic efficiency is a major obstacle to actual applications. Here an effective and feasible method to dramatically increase the visible light photocatalytic efficiency by forming C3N4/BiFeO3 ferroelectric heterojunctions is reported, wherein the band alignment and piezo-/ferroelectricity have synergistic positive effects in accelerating the separation of the photogenerated carriers...
January 17, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29340341/credentialing-of-hospitalists-in-ultrasound-guided-bedside-procedures-a-position-statement-of-the-society-of-hospital-medicine
#19
Brian P Lucas, David M Tierney, Trevor P Jensen, Ria Dancel, Joel Cho, Mahmoud El-Barbary, Ricardo Franco-Sadud, Nilam Soni
Ultrasound guidance is used increasingly to perform the following 6 bedside procedures that are core competencies of hospitalists: abdominal paracentesis, arterial catheter placement, arthrocentesis, central venous catheter placement, lumbar puncture, and thoracentesis. Yet most hospitalists have not been certified to perform these procedures, whether using ultrasound guidance or not, by specialty boards or other institutions extramural to their own hospitals. Instead, hospital privileging committees often ask hospitalist group leaders to make ad hoc intramural certification assessments as part of credentialing...
January 18, 2018: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/29340283/european-respiratory-society-international-congress-2017-highlights-from-the-clinical-assembly
#20
Nicolas Kahn, Evgeni Mekov, Laura Fregonese, Vasileios Andrianopoulos, Frits M E Franssen, Aleksandar Grgic, Johan Coolen, Peter I Bonta, Daniela Gompelmann, Jouke T Annema, Paola Faverio, Francesco Bonella, Luke Daines, Hillary Pinnock, Janwillem Kocks, Felix Herth
This article contains highlights and a selection of the scientific advances from the European Respiratory Society's Clinical Assembly (Assembly 1 and its six respective groups) that were presented at the 2017 European Respiratory Society International Congress in Milan, Italy. The most relevant topics from each of the groups will be discussed, covering a wide range of areas including clinical problems, rehabilitation and chronic care, thoracic imaging, interventional pulmonology, diffuse and parenchymal lung diseases, and general practice and primary care...
January 2018: ERJ Open Research
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