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https://www.readbyqxmd.com/read/28549340/a-critical-assessment-of-the-in-vitro-measurement-of-cortical-bone-stiffness-with-ultrasound
#1
L Peralta, X Cai, P Laugier, Q Grimal
Elasticity assessment based on bulk wave velocity (BWV) measurements is the most popular technique to characterize the anisotropic stiffness tensor in cortical bone. Typically, a cuboid bone specimen is cut with its sides along the different anatomical directions. Then, the velocity of shear and longitudinal waves propagating along different directions are assessed, from which stiffness coefficients are calculated. Despite the importance of obtaining accurate elasticity values for bone research, there is no generally accepted protocol to measure BWV and the precision of the technique has been seldom investigated...
May 19, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28549295/structural-characterization-of-astaxanthin-aggregates-as-revealed-by-analysis-and-simulation-of-optical-spectra
#2
Liping Lu, Taoping Hu, Zhigang Xu
Carotenoids can self-assemble in hydrated polar solvents to form J- or H-type aggregates, inducing dramatic changes in photophysical properties. Here, we measured absorption and emission spectra of astaxanthin in ethanol-water solution using ultraviolet-visible and fluorescence spectrometers. Two types of aggregates were distinguished in mixed solution at different water contents by absorption spectra. After addition of water, all probed samples immediately formed H-aggregates with maximum blue shift of 31nm...
May 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28549262/passive-sampling-of-wastewater-as-a-tool-for-the-long-term-monitoring-of-community-exposure-illicit-and-prescription-drug-trends-as-a-proof-of-concept
#3
J A Baz-Lomba, Christopher Harman, Malcolm Reid, Kevin V Thomas
A passive sampling device, the Polar Organic Chemical Integrative Sampler (POCIS), was calibrated in-situ over a 4-week period in Oslo (Norway) for 10 illicit drugs and pharmaceuticals with the goal of developing an approach for monitoring long-term wastewater drug loads. The calibrations were performed in triplicate using three different overlapping calibration sets under changing environmental conditions that allowed the uncertainty of the sampling rates to be evaluated. All 10 compounds exhibited linear uptake kinetics and provided sampling rates of between 0...
May 20, 2017: Water Research
https://www.readbyqxmd.com/read/28549243/australian-football-players-experiencing-groin-pain-exhibit-reduced-subscale-scores-of-activities-of-daily-living-and-sport-and-recreation-on-the-hagos-questionnaire-a-case-control-study
#4
Michael K Drew, Gregory Lovell, Thorvaldur S Palsson, Pauline E Chiarelli, Peter G Osmotherly
OBJECTIVES: To report normative responses to the HAGOS questionnaire for Australian football players and to determine whether any of the HAGOS questionnaire sub scales can differentiate players with and without groin pain. DESIGN: Case-control. SETTING: Clinical setting. PARTICIPANTS: Professional (n = 66) and semi-professional (n = 9) Australian football (AF) players with current groin pain (n = 16) and controls (n = 57) without current groin pain...
April 20, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28549215/nanowire-mesh-templated-growth-of-out-of-plane-three-dimensional-fuzzy-graphene
#5
Raghav Garg, Sahil Kumar Rastogi, Michael Lamparski, Sergio de la Barrera, Gordon T Pace, Noel T Nuhfer, Benjamin Matthew Hunt, Vincent Meunier, Tzahi Cohen-Karni
Graphene, a honeycomb sp(2) hybridized carbon lattice, is a promising building block for hybrid-nanomaterials due to its electrical, mechanical, and optical properties. Graphene can be readily obtained through mechanical exfoliation, solution-based deposition of reduced graphene oxide (rGO), and chemical vapor deposition (CVD). The resulting graphene films' topology is two-dimensional (2D) surface. Recently a three-dimensional (3D) graphene topology has been demonstrated by various approaches. However, the resulting graphene films are lying flat on the surface hence still exposing a 2D surface topology...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28549173/incidental-mosquitocidal-effect-of-an-ivermectin-mass-drug-administration-on-anopheles-farauti-conducted-for-scabies-control-in-the-solomon-islands
#6
Christian Kositz, Jeptah Talina, Jason Diau, Rowena Asugeni, Cheryl Whitehorn, David Mabey, Carlos Chaccour, Michael Marks
Background: The Solomon Islands is targeting elimination of malaria by 2030. The dominant vector is the predominantly exophagic, exophilic Anopheles farauti sensu strictu. This biting behaviour limits the efficacy of conventional vector control tools and highlights the need for new strategies. When administered to humans ivermectin has been shown to have a mosquitocidal effect. Mass drug administration (MDA) with ivermectin is an emerging strategy in the control of scabies. In this study we explored any incidental effect of ivermectin MDA conducted for scabies control on mosquitoes...
May 26, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28549125/transfemoral-transapical-and-transcatheter-aortic-valve-implantation-and-surgical-aortic-valve-replacement-a-meta-analysis-of-direct-and-adjusted-indirect-comparisons-of-early-and-mid-term-deaths
#7
Tomo Ando, Hisato Takagi, Cindy L Grines
Clinical outcomes of transfemoral-transcatheter aortic valve implantation (TF-TAVI) versus surgical aortic valve replacement (SAVR) or transapical (TA)-TAVI are limited to a few randomized clinical trials (RCTs). Because previous meta-analyses only included a limited number of adjusted studies or several non-adjusted studies, our goal was to compare and summarize the outcomes of TF-TAVI vs SAVR and TF-TAVI vs TA-TAVI exclusively with the RCT and propensity-matched cohort studies with direct and adjusted indirect comparisons to reach more precise conclusions...
May 26, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28549088/quantitative-association-between-peripapillary-bruch-s-membrane-shape-and-intracranial-pressure
#8
Amulya Gampa, Gautam Vangipuram, Zainab Shirazi, Heather E Moss
Purpose: The purpose of this study was to determine if there is a quantitative relationship between chronic intracranial pressure (ICP) and peripapillary Bruch's membrane (pp-BM) shape and to determine whether change in pp-BM shape can be detected within 1 hour after ICP lowering by lumbar puncture (LP). Methods: In this study, 30° nasal-temporal optical coherence tomography B-scans were obtained within 1 hour before and after LP in 39 eyes from 20 patients (age = 23-86 years, 75% female, ICP [opening pressure] = 10-55 cm H2O)...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28549087/thalamic-alterations-remote-to-infarct-appear-as-focal-iron-accumulation-and-impact-clinical-outcome
#9
Grégory Kuchcinski, Fanny Munsch, Renaud Lopes, Antoine Bigourdan, Jason Su, Sharmila Sagnier, Pauline Renou, Jean-Pierre Pruvo, Brian K Rutt, Vincent Dousset, Igor Sibon, Thomas Tourdias
Thalamic alterations have been observed in infarcts initially sparing the thalamus but interrupting thalamo-cortical or cortico-thalamic projections. We aimed at extending this knowledge by demonstrating with in vivo imaging sensitive to iron accumulation, one marker of neurodegeneration, that (i) secondary thalamic alterations are focally located in specific thalamic nuclei depending on the initial infarct location; and (ii) such secondary alterations can contribute independently to the long-term outcome. To tackle this issue, 172 patients with an infarct initially sparing the thalamus were prospectively evaluated clinically and with magnetic resonance imaging to quantify iron through R2* map at 24-72 h and at 1-year follow-up...
May 25, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28549082/pharmacokinetics-and-pharmacodynamics-of-propofol-changes-in-patients-with-frontal-brain-tumours
#10
M M Sahinovic, D J Eleveld, T Miyabe-Nishiwaki, M M R F Struys, A R Absalom
Background: Models of propofol pharmacokinetics and pharmacodynamics developed in patients without brain pathology are widely used for target-controlled infusion (TCI) during brain tumour excision operations. The goal of this study was to determine if the presence of a frontal brain tumour influences propofol pharmacokinetics and pharmacodynamics and existing PK-PD model performance. Methods: Twenty patients with a frontal brain tumour and 20 control patients received a propofol infusion to achieve an induction-emergence-induction anaesthetic sequence...
May 26, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28549073/repeated-measurements-of-blood-pressure-and-cholesterol-improves-cardiovascular-disease-risk-prediction-an-individual-participant-data-meta-analysis
#11
Ellie Paige, Jessica Barrett, Lisa Pennells, Michael Sweeting, Peter Willeit, Emanuele Di Angelantonio, Vilmundur Gudnason, Børge G Nordestgaard, Bruce M Psaty, Uri Goldbourt, Lyle G Best, Gerd Assmann, Jukka T Salonen, Paul J Nietert, Wm Monique Verschuren, Eric J Brunner, Richard A Kronmal, Veikko Salomaa, Stephan Jl Bakker, Gilles R Dagenais, Shinichi Sato, Jan-Håkan Jansson, Johann Willeit, Altan Onat, Agustin Gómez de la Cámara, Ronan Roussel, Henry Völzke, Rachel Dankner, Robert W Tipping, Tom W Meade, Chiara Donfrancesco, Lewis H Kuller, Annette Peters, John Gallacher, Daan Kromhout, Hiroyasu Iso, Matthew Knuiman, Edoardo Casiglia, Maryam Kavousi, Luigi Palmieri, Johan Sundström, Barry R Davis, Inger Njølstad, David Couper, John Danesh, Simon G Thompson, Angela Wood
The added value of incorporating information from repeated measurements of blood pressure and cholesterol for cardiovascular disease (CVD) risk prediction has not been rigorously assessed. We used data from the Emerging Risk Factors Collaboration on 191,445 adults (38 cohorts from across 17 countries with data from 1962-2014) with > 1 million measurements of systolic blood pressure, total cholesterol and high-density lipoprotein cholesterol; over a median 12 years of follow-up, 21,170 CVD events occurred...
May 26, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28549064/chemomechanical-regulation-of-myosin-ic-cross-bridges-deducing-the-elastic-properties-of-an-ensemble-from-single-molecule-mechanisms
#12
Florian Berger, A J Hudspeth
Myosin Ic is thought to be the principal constituent of the motor that adjusts mechanical responsiveness during adaptation to prolonged stimuli by hair cells, the sensory receptors of the inner ear. In this context myosin molecules operate neither as filaments, as occurs in muscles, nor as single or few molecules, as characterizes intracellular transport. Instead, myosin Ic molecules occur in a complex cluster in which they may exhibit cooperative properties. To better understand the motor's remarkable function, we introduce a theoretical description of myosin Ic's chemomechanical cycle based on experimental data from recent single-molecule studies...
May 26, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28549046/associations-of-physical-fitness-and-body-composition-characteristics-with-simulated-military-task-performance
#13
K Pihlainen, M Santtila, K Häkkinen, H Kyröläinen
The purpose of the present study was to evaluate the associations of physical fitness and body composition characteristics with anaerobic endurance performance, tested in the combat load using the occupationally relevant military simulation test (MST). Eighty-one male soldiers, deployed to a crisis management operation in the Middle East, volunteered for the study and participated in a test battery consisting measurements of muscle strength, body composition characteristics, endurance capacity, and MST.A Spearman correlational analysis revealed that the strongest variable, correlated with MST time, was the countermovement jump performed with the combat load (CMJ2) (rs = -0...
May 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28549016/liberal-bilateral-internal-thoracic-artery-use-in-people-with-diabetes-neutralizes-the-negative-impact-of-insulin-requiring-status
#14
Giuseppe Gatti, Bernardo Benussi, Marina Bollini, Gabriella Forti, Angela Poletti, Elisabetta Rauber, Marco Gabrielli, Ariella De Monte, Gianfranco Sinagra, Aniello Pappalardo
AIMS: Bilateral internal thoracic artery (BITA) grafts are underused in insulin-dependent diabetic patients because of increased risk of postoperative complications. The impact of the insulin-requiring status on outcomes after routine BITA grafting was investigated in this retrospective study. METHODS: Skeletonized BITA grafts were used in 3228 (71.6%) of 4508 consecutive patients having multivessel coronary disease who underwent isolated coronary bypass surgery at the authors' institution from January 1999 to August 2015...
May 25, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28549004/efficiency-of-b-mode-ultrasound-and-strain-elastography-in-differentiating-between-benign-and-malignant-cervical-lymph-nodes
#15
Eser Tugut, Cetin Celenk, Asli Tanrivermis Sayit, Tümay Bekci, Hediye Pinar Gunbey, Kerim Arslan
PURPOSE: The purpose of this study was to evaluate the diagnostic accuracy and efficiency of ultrasonography (US), especially when combined with strain elastography (SE), in differentiating between benign and malignant cervical lymph nodes (LNs). METHODS: Forty-one LNs were examined by B-mode US, power Doppler US, and SE. The following imaging features were analyzed: shape, echogenicity, echogenic hilum, calcification, intranodal vascular pattern, elasticity scores (5 categories), and strain ratio...
May 25, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28548946/prognostic-role-of-lncrna-tug1-for-cancer-outcome-evidence-from-840-cancer-patients
#16
Jia Liu, Jieru Lin, Yingqi Li, Yunyuan Zhang, Xian Chen
LncRNA TUG1 has been demonstrated to be aberrantly expressed in several types of cancer and maybe serve as a prognostic marker for cancer patients. However, most individual studies have been limited by small sample sizes and controversial results. Therefore, this meta analysis was conducted to analyze available data to delineate the potential clinical application of lncRNA TUG1 on cancer prognosis, lymph node metastasis and tumor progression. Up to February 20, 2017, literature collections were conducted by comprehensive searching electronic databases, including Cochrane Library, PubMed, Embase, BioMed Central, Springer, ScienceDirect, ISI Web of Knowledge, together with three Chinese databases...
May 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28548919/a-novel-method-for-quanitifying-comfort-in-child-passengers-demonstrates-an-association-between-child-restraint-comfort-and-errors-in-use-of-booster-seats
#17
Cameron K Fong, Lynne E Bilston, Gunther Paul, Julie Brown
OBJECTIVE: Misuse of child restraint systems is a widespread and long-standing problem impacting risk of injury and death in car crashes. Discomfort has been suggested as a causative factor for misuse, particularly in errors introduced by children while they use the restraints. However, the relationship between comfort and errors in use has never been studied. In this study we examine the reliability and sensitivity of a newly developed observational method for assessing comfort in children in vehicles...
May 29, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28548858/theoretical-study-of-acetic-acid-association-based-on-hydrogen-bonding-mechanism
#18
Minhua Zhang, Lihang Chen, Huaming Yang, Jing Ma
Combining molecular dynamics (MD) and quantum chemistry (QM) simulation, the association mechanism of acetic acid systems were examined. DFT method was proposed to compare the hydrogen-bonding energy of variable acetic acid dimers, and definitely provided the stable dimers configuration. Geometry parameters of dimers were also obtained by QM calculations, which were taken as the characteristic criteria for further MD analysis. Proportion of different acetic acid dimers in gas phase was obtained by Radial distribution function (RDF) analysis, and cyclic dimer with two O=c-Hoacid hydrogen bonds was demonstrated as the most stable structure...
May 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28548854/curcumin-protects-membranes-through-carpet-or-insertion-model-depending-on-hydration
#19
Richard J Alsop, Alexander Dhaliwal, Maikel C Rheinstadter
Curcumin is the main ingredient of turmeric, a common Indian spice. Curcumin shows a broad spectrum of effects, including anti-Alzheimer's and anti-oxidant properties. An interaction between curcumin and lipid membranes has been speculated as the root-cause, and the molecule is often proposed to `protect' the bilayer. However, the detailed molecular mechanism of this protection is disputed. There is evidence that curcumin either a) lies flat on the bilayer and provides a `carpet' for protection by forming a steric barrier, or b) inserts into the membrane and stiffens tails, thereby protecting against peptide insertion...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28548853/a-series-of-fluorescent-and-colorimetric-chemodosimeters-for-selective-recognition-of-cyanide-based-on-fret-mechanism
#20
Ying-Xi Hua, Yongliang Shao, Ya-Wen Wang, Yu Peng
A series of fluorescence "turn-on" probes (PY, AN, NA, B1 and B2) have been developed and successfully applied to detect cyanide anions based on Michael-addition reaction and FRET mechanism. These probes demonstrated good selectivity, high sensitivity and very fast recognition for CN-. Especially, the fluorescence response of probe NA finished within 3 seconds. Low LODs (down to 63 nM) are also obtained in these probes with remarkable fluorescence enhancement factors. In addition, fluorescence colors of these probes turned to blue, yellow or orange upon sensing CN-...
May 26, 2017: Journal of Organic Chemistry
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