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https://www.readbyqxmd.com/read/29658019/accurate-theoretical-characterization-of-dioxygen-difluoride-a-problem-resolved
#1
Olfa Ferchichi, Alexander Alijah, Thibaud Cours, Nejm-Eddine Jaidane, Najoua Derbel
Dioxygen difluoride is a tough molecule that has defied accurate theoretical description for many decades. In the present work we have identified the reason for this resistance: the flatness of the OO, and more important OF, stretching potential energy curves, which make it difficult to localise the global minimum. It is not related to the weak multi-reference character. Using high-level CCSD(T)-F12/VTZ-F12 ab initio theory, the global minimum has been properly located and vibrationally averaged bond lengths obtained...
April 16, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29583128/mobility-gap-and-quantum-transport-in-functionalized-graphene-bilayer
#2
Ahmed Missaoui, Jouda Jemaa Khabthani, Nejm-Eddine Jaidane, Didier Mayou, Guy Trambly de Laissardière
In a Bernal graphene bilayer, carbon atoms belong to two inequivalent sublattices A and B, with atoms that are coupled to the other layer by pσ bonds belonging to sublattice A and the other atoms belonging to sublattice B. We analyze the density of states and the conductivity of Bernal graphene bilayers when atoms of sublattice A or B only are randomly functionalized. We find that for a selective functionalization on sublattice B only, a mobility gap of the order of 0.5 eV is formed close to the Dirac energy at concentration of adatoms c ≥ 0...
March 27, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29553422/publication-patterns-on-occupied-palestine-in-four-key-medical-journals-1990-2016-a-descriptive-study
#3
Mads Gilbert
BACKGROUND: The atrocities in Syria have been covered in the four general medical weekly journals in the USA and the UK. Medical journal articles addressing political determinants of public health have rightly described and criticised the international community's failure to enforce humanitarian law while urging global bodies of power to ensure protection of civilians and civilian infrastructure and medical services. Discussions of the political influences on health of people in the occupied Palestinian territory (West Bank and Gaza Strip) seem to be considered politically out-of-bounds by some medical journals...
February 21, 2018: Lancet
https://www.readbyqxmd.com/read/29527075/home-institution-bias-in-the-new-england-journal-of-medicine-a-noninferiority-study-on-citation-rates
#4
Alberto Falk Delgado, Anna Falk Delgado
Recently, in the four top journals of humanities, an institutional bias towards publication of authors from Harvard and Yale was shown. The New England Journal of Medicine (NEJM) is today the highest ranked general medical journal. It is unknown if there exists institutional bias favoring publication of articles originating from Harvard University, since the NEJM is produced by the Massachusetts Medical Society with close connections to the Harvard University. We examined if studies originating from the Harvard University published in the NEJM were noninferior in terms of citation rates compared to articles with an origin outside Harvard University...
2018: Scientometrics
https://www.readbyqxmd.com/read/29477987/declarations-of-conflict-of-interest-are-still-inadequate
#5
Lars H Breimer, Torbjörn K Nilsson, Michael E Breimer
Declaration of conflicts of interest (COI, understood mainly as financial) in medical publications is long established. Most journals refer only to the guidelines of the International Committee of Medical Journal Editors (ICMJE) but not to those of the WAME (World Association of Medical Editors). We surveyed 17 journals and found only one (BJOG), which explicitly mentioned "religious interest" as an example of a possible COI and one other journal included "personal belief" (Journal of Obstetrics and Gynaecology of India) as a COI...
February 7, 2018: Indian Journal of Medical Ethics
https://www.readbyqxmd.com/read/29446715/update-in-women-s-heart-disease-prevention-and-screening
#6
Sarah Tilstra, Melissa A McNeil
The goal in selecting these recent articles was to help identify literature that may change the clinical practice of women's health for internists. Articles were identified by reviewing the high-impact medical and women's health journals, national guidelines, ACP JournalWise, and NEJM Journal Watch. Cardiovascular (CV) disease remains the leading cause of death in women. The emphasis of this review is on identifying opportunities for CV risk reduction to prevent disease and on early identification of women with preexisting atherosclerotic disease to allow for early initiation of medical treatment...
February 2018: Journal of Women's Health
https://www.readbyqxmd.com/read/29429804/clinical-outcome-of-prostate-cancer-patients-with-germline-dna-repair-mutations-retrospective-analysis-from-an-international-study
#7
Joaquin Mateo, Heather H Cheng, Himisha Beltran, David Dolling, Wen Xu, Colin C Pritchard, Helen Mossop, Pasquale Rescigno, Raquel Perez-Lopez, Verena Sailer, Michael Kolinsky, Ada Balasopoulou, Claudia Bertan, David M Nanus, Scott T Tagawa, Heather Thorne, Bruce Montgomery, Suzanne Carreira, Shahneen Sandhu, Mark A Rubin, Peter S Nelson, Johann S de Bono
BACKGROUND: Germline DNA damage repair gene mutation (gDDRm) is found in >10% of metastatic prostate cancer (mPC). Their prognostic and predictive impact relating to standard therapies is unclear. OBJECTIVE: To determine whether gDDRm status impacts benefit from established therapies in mPC. DESIGN, SETTING, AND PARTICIPANTS: This is a retrospective, international, observational study. Medical records were reviewed for 390 mPC patients with known gDDRm status...
May 2018: European Urology
https://www.readbyqxmd.com/read/29365281/moving-ahead-with-a-new-nejm-org
#8
EDITORIAL
Edward W Campion, Lisa A Scott, John E Muenning, Kathy L Stern, Maro A Gartside, Kirsti M Frazier, Nancy S Burns, Allison J Lawlor, Jacqueline M Prince, Robert J Stuart, Stephen Morrissey, Jeffrey M Drazen
No abstract text is available yet for this article.
February 8, 2018: New England Journal of Medicine
https://www.readbyqxmd.com/read/29306063/many-randomized-clinical-trials-may-not-be-justified-a-cross-sectional-analysis-of-the-ethics-and-science-of-randomized-clinical-trials
#9
Julie De Meulemeester, Mark Fedyk, Lucas Jurkovic, Michael Reaume, Dar Dowlatshahi, Grant Stotts, Michel Shamy
OBJECTIVE: We have proposed that three scientific criteria are important for the ethical justification of randomized clinical trials (RCTs): (1) they should be designed around a clear hypothesis; (2) uncertainty should exist around that hypothesis; (3) that uncertainty should be as established through a systematic review. We hypothesized that the majority of a sample of recently published RCTs would not explicitly incorporate these criteria, therefore rendering them potentially unjustified on scientific grounds...
May 2018: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/29298254/introducing-jbjs-clinical-classroom-on-nejm-knowledge
#10
Marc F Swiontkowski
No abstract text is available yet for this article.
January 3, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29236909/sudden-unexpected-death-in-parkinson-s-disease-sudpar-a-review-of-publications-since-the-decade-of-the-brain
#11
EDITORIAL
Fulvio A Scorza, Andrea C do Carmo, Ana C Fiorini, Mariana B Nejm, Carla A Scorza, Josef Finsterer, Henrique B Ferraz
No abstract text is available yet for this article.
November 2017: Clinics
https://www.readbyqxmd.com/read/29228640/comparison-of-primary-endpoints-between-publications-registries-and-protocols-of-phase-iii-cancer-clinical-trials
#12
Fei Liang, Xinmei Guo, Sheng Zhang, Hongxi Xue, Qiang Chen, Xichun Hu
Background: Decisions by leading journals to require trial registration and to make protocols of phase III randomized clinical trials (RCTs) publicly accessible were landmark events in clinical trial reporting. Materials and Methods: We identified phase III cancer RCTs published between 2013 and 2015 in New England Journal of Medicine ( NEJM ), The Lancet, The lancet Oncology, JAMA and Journal of Clinical Oncology (JCO). Results: We identified 345 reports of phase III RCTs of which 217 (62...
November 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/29149153/analysis-of-reporting-bias-in-vertebral-augmentation
#13
Douglas P Beall, Sean M Tutton, Kieran Murphy, Wayne Olan, Christopher Warner, Jack B Test
Osteoporotic vertebral compression fractures (OVCFs) are a significant cause of morbidity and mortality in the United States and worldwide, with estimates of 750,000 to 1.5 million occurring annually. As the elderly population continues to increase, the incidence of OVCFs will continue to rise, as will the morbidity and mortality associated with this condition. Vertebral augmentation (VA) was almost universally accepted as the appropriate treatment modality prior to 2 sham trials published in 2009 by the New England Journal of Medicine (NEJM)...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29133334/national-citation-patterns-of-nejm-the-lancet-jama-and-the-bmj-in-the-lay-press-a-quantitative-content-analysis
#14
Gonzalo Casino, Roser Rius, Erik Cobo
OBJECTIVES: To analyse the total number of newspaper articles citing the four leading general medical journals and to describe national citation patterns. DESIGN: Quantitative content analysis. SETTING/SAMPLE: Full text of 22 general newspapers in 14 countries over the period 2008-2015, collected from LexisNexis. The 14 countries have been categorised into four regions: the USA, the UK, Western World (European countries other than the UK, and Australia, New Zealand and Canada) and Rest of the World (other countries)...
November 12, 2017: BMJ Open
https://www.readbyqxmd.com/read/29058806/an-epidemic-of-multiple-sclerosis-and-falling-infection-rates-reflecting-on-comparisons-made-and-the-rising-multiple-sclerosis-incidence-in-bach-s-2002-new-england-journal-of-medicine-figure
#15
H Tremlett, R Lucas
BACKGROUND AND PURPOSE: We set out to revisit and comment on the evidence surrounding a popular figure published in the New England Journal of Medicine (2002), which suggests that the incidence of immune-mediated diseases, including multiple sclerosis (MS), is increased by reduced exposure to infections. METHODS: Commentary. RESULTS: We found that, to date (May 2017), this influential article has been cited >2000 times. However, on close investigation of the figure, we noticed some problems...
January 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28993088/hip-and-knee-arthroplasty-orthopedic-literature-in-medical-journals-is-it-negatively-biased
#16
Ronald E Delanois, Chukwuweike U Gwam, Nicolas S Piuzzi, Morad Chughtai, Arthur L Malkani, Peter M Bonutti, Michael A Mont
BACKGROUND: Healthcare policy is often determined by well-designed studies most often published in high-impact medical journals. However, concern about the presence of publication bias against lower-extremity arthroplasty-related studies has called into question some of the validity of certain reports. There are only a few studies investigating the presence of the bias in high-impact medical journals against lower-extremity arthroplasty intervention, particularly in the Journal of American Medical Association (JAMA), New England Journal of Medicine (NEJM), and the Lancet...
February 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28956605/rotational-excitation-of-the-cp-%C3%AE-2-%C3%AE-open-shell-molecule-due-to-collision-with-he-1-s
#17
Cheikh T Bop, N A Boye Faye, K Hammami, N Jaïdane
Phosphorus bearing molecules have been discovered in the circumstellar and interstellar media. Modeling their abundance accurately requires computations of rate coefficients induced by collision with He and H2 (i.e., the most abundant gaseous components). These calculations may be carried out by first determining highly accurate potential energy surface (PES) and cross sections. In this paper, we present the first PES of the CP(X2 Σ+ )-He(1 S) van der Waals collisional complex. The ab initio interaction potential was performed using the explicitly correlated restricted coupled cluster approach with simple, double, and perturbative triple excitation (RCCSD(T)-F12) in connection with the augmented-correlation consistent-polarized valence triple-ζ Gaussian basis set (aug-cc-pVTZ)...
October 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28762422/the-gas-phase-structure-of-dimethyl-peroxide
#18
Olfa Ferchichi, Najoua Derbel, Nejm-Eddine Jaidane, Thibaud Cours, Alexander Alijah
There has been a disagreement amongst experimentalists and between experimentalists and theoreticians as to the gas-phase structure of dimethyl peroxide. We have investigated this problem with high-level CCSD(T)-F12 and MRCI procedures. There can be no doubt anymore that, at the minimum of the potential energy surface, the COOC fragment has a trans-structure. The dynamical structure of the molecule can, however, be different and be explained by the very slow torsional motion. We have analysed the dynamical structure using numerical wavefunctions of the torsional motion and a fully optimized potential curve of MP2/aug-cc-pVTZ quality...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28749016/trends-in-study-design-and-the-statistical-methods-employed-in-a-leading-general-medicine-journal
#19
M Gosho, Y Sato, K Nagashima, S Takahashi
WHAT IS KNOWN AND OBJECTIVE: Study design and statistical methods have become core components of medical research, and the methodology has become more multifaceted and complicated over time. The study of the comprehensive details and current trends of study design and statistical methods is required to support the future implementation of well-planned clinical studies providing information about evidence-based medicine. Our purpose was to illustrate study design and statistical methods employed in recent medical literature...
February 2018: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/28746658/relationship-between-periodontal-disease-and-cardiovascular-risk-factors-among-young-and-middle-aged-brazilians-cross-sectional-study
#20
Alessandra Carvalho Goulart, Favius Armani, Astrid Marie Arap, Thais Nejm, Juliana Barros Andrade, Henry Bittar Bufarah, Danielli Haddad Syllos Dezen
CONTEXT AND OBJECTIVE: It has been suggested in the literature that periodontal disease (PD) is associated with cardiovascular risk. The objective of this study was to appraise the relationship between periodontal disease (gingivitis and periodontitis) and traditional cardiovascular risk factors (obesity, hypertension, dyslipidemia, diabetes and metabolic syndrome) among young and middle-aged adults attended at a health promotion and check-up center in the city of São Paulo, Brazil. DESIGN AND SETTING: Cross-sectional study at the Health Promotion and Check-up Center of Hospital Sírio-Libanês, São Paulo, Brazil...
May 2017: São Paulo Medical Journal, Revista Paulista de Medicina
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