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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/28548523/strength-and-viscosity-effects-on-perturbed-shock-front-stability-in-metals
#2
S Opie, E Loomis, P Peralta, T Shimada, R P Johnson
Computational modeling and experimental measurements on metal samples subject to a laser-driven, ablative Richtmyer-Meshkov instability showed differences between viscosity and strength effects. In particular, numerical and analytical solutions, coupled with measurements of fed-through perturbations, generated by perturbed shock fronts onto initially flat surfaces, show promise as a validation method for models of deviatoric response in the postshocked material. Analysis shows that measurements of shock perturbation amplitudes at low sample thickness-to-wavelength ratios are not enough to differentiate between strength and viscosity effects, but that surface displacement data of the fed-through perturbations appears to resolve the ambiguity...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28545715/apol1-genetic-variants-are-not-associated-with-longitudinal-blood-pressure-in-young-black-adults
#3
Teresa K Chen, Michelle M Estrella, Eric Vittinghoff, Feng Lin, Orlando M Gutierrez, Holly Kramer, Cora E Lewis, Jeffrey B Kopp, Norrina B Allen, Cheryl A Winkler, Kirsten B Bibbins-Domingo, Carmen A Peralta
Whether APOL1 polymorphisms contribute to the excess risk of hypertension among blacks is unknown. To assess this we evaluated whether self-reported race and, in blacks, APOL1 risk variants (high-risk [2 risk alleles] versus low-risk [0-1 risk allele]) were associated with longitudinal blood pressure. Blood pressure trajectories were determined using linear mixed-effects (slope) and latent class models (5 distinct groups) during 25 years of follow-up in the Coronary Artery Risk Development in Young Adults Study...
May 23, 2017: Kidney International
https://www.readbyqxmd.com/read/28543053/sofosbuvir-and-ribavirin-in-adolescents-12-to-17-years-old-with-hepatitis-c-virus-genotype-2-or-3-infection
#4
Stefan Wirth, Philip Rosenthal, Regino P Gonzalez-Peralta, Maureen M Jonas, William F Balistreri, Lin Chuan-Hao, Winita Hardikar, Kathryn Kersey, Benedetta Massetto, Bittoo Kanwar, Diana M Brainard, Jiang Shao, Evguenia Svarovskaia, Brian Kirby, Ronen Arnon, Karen F Murray, Kathleen B Schwarz
BACKGROUND & AIMS: Children with chronic hepatitis C virus (HCV) infection have limited treatment options. We evaluated the all-oral combination of sofosbuvir and ribavirin in adolescents aged 12-17 with HCV genotype 2 or 3. METHODS: Fifty-two patients received sofosbuvir 400mg once daily and weight-based ribavirin twice daily for 12 (genotype 2) or 24 (genotype 3) weeks. The pharmacokinetics of sofosbuvir and its metabolite GS-331007 were evaluated by intensive plasma sampling at day 7 in the first 10 patients enrolled, and by sparse sampling in all patients throughout treatment...
May 22, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28538111/cardiovascular-and-metabolic-effects-of-angptl3-antisense-oligonucleotides
#5
Mark J Graham, Richard G Lee, Teresa A Brandt, Li-Jung Tai, Wuxia Fu, Raechel Peralta, Rosie Yu, Eunju Hurh, Erika Paz, Bradley W McEvoy, Brenda F Baker, Nguyen C Pham, Andres Digenio, Steven G Hughes, Richard S Geary, Joseph L Witztum, Rosanne M Crooke, Sotirios Tsimikas
Background Epidemiologic and genomewide association studies have linked loss-of-function variants in ANGPTL3, encoding angiopoietin-like 3, with low levels of plasma lipoproteins. Methods We evaluated antisense oligonucleotides (ASOs) targeting Angptl3 messenger RNA (mRNA) for effects on plasma lipid levels, triglyceride clearance, liver triglyceride content, insulin sensitivity, and atherosclerosis in mice. Subsequently, 44 human participants (with triglyceride levels of either 90 to 150 mg per deciliter [1...
May 24, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28522656/comparison-between-different-measures-of-body-fat-with-kidney-function-decline-and-incident-ckd
#6
Magdalena Madero, Ronit Katz, Rachel Murphy, Anne Newman, Kushang Patel, Joachim Ix, Carmen Peralta, Suzanne Satterfield, Linda Fried, Michael Shlipak, Mark Sarnak
BACKGROUND AND OBJECTIVES: Although anthropometric measures of body fat are associated with development of CKD, they may not be able to distinguish between various forms of fat and therefore may be less accurate than computed tomography (CT) measures. We compared the association of CT and anthropometric measures of obesity with kidney outcomes in the Health Aging and Body Composition Study. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Participants were recruited from March of 1997 through July of 1998...
May 18, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28521939/developmental-and-evolutionary-mechanisms-shaping-butterfly-eyespots
#7
REVIEW
Patrícia Beldade, Carolina M Peralta
Butterfly eyespots are visually compelling models to study the reciprocal interactions between evolutionary and developmental processes that shape phenotypic variation. They are evolutionarily diversified, ecologically relevant, and developmentally tractable, and have made key contributions to linking genotype, development, phenotype and fitness. Advances in the availability of analytical tools (e.g. gene editing and visualization techniques) and resources (e.g. genomic and transcriptomic data) are boosting the detailed dissection of the mechanisms underlying eyespot development and evolution...
February 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28505853/dynamic-stabilization-of-janus-sphere-trans-dimers
#8
Joel N Johnson, Amir Nourhani, Robert Peralta, Christopher McDonald, Benjamin Thiesing, Christopher J Mann, Paul E Lammert, John G Gibbs
We experimentally investigated the self-assembly of chemically active colloidal Janus spheres into dimers. The trans-dimer conformation, in which the two active sites are oriented roughly in opposite directions and the particles are osculated at their equators, becomes dominant as the hydrogen peroxide fuel concentration increases. Our observations suggest high spinning frequency combined with little translational motion is at least partially responsible for the stabilization of the trans-dimer as activity increases...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28502698/effectiveness-of-a-fine-motor-skills-rehabilitation-program-on-upper-limb-disability-manual-dexterity-pinch-strength-range-of-fingers-motion-performance-in-activities-of-daily-living-functional-independency-and-general-self-efficacy-in-hand-osteoarthritis-a
#9
Jose Manuel Pérez-Mármol, Ma Carmen García-Ríos, María Azucena Ortega-Valdivieso, Enrique Elías Cano-Deltell, María Isabel Peralta-Ramírez, Kelly Ickmans, María Encarnación Aguilar-Ferrándiz
STUDY DESIGN: A randomized clinical trial. INTRODUCTION: Rehabilitation treatments for improving fine motor skills (FMS) in hand osteoarthritis (HOA) have not been well explored yet. PURPOSE OF THE STUDY: To assess the effectiveness of a rehabilitation program on upper limb disability, independence of activities of daily living (ADLs), fine motor abilities, functional independency, and general self-efficacy in older adults with HOA. METHODS: About 45 adults (74-86 years) with HOA were assigned to an experimental group for completing an FMS intervention or a control group receiving conventional occupational therapy...
May 11, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28501721/cortical-bone-elasticity-measured-by-resonant-ultrasound-spectroscopy-is-not-altered-by-defatting-and-synchrotron-x-ray-imaging
#10
X Cai, L Peralta, A Giron, L Helfen, C Olivier, F Peyrin, P Laugier, Q Grimal
In the study of mechanical properties of human bone, specimens may be defatted before experiments to prevent contamination and the risk of infections. High energy synchrotron radiation micro-computed tomography (SR-μCT) is a popular technique to study bone microstructure. However, little is known about the effects of defatting or irradiation during SR-μCT imaging on different elastic coefficients including shear and longitudinal moduli in different anatomical directions. In this work, these effects are evaluated on a set of 24 samples using resonant ultrasound spectroscopy (RUS), which allows one to accurately measure the complete set of elastic coefficients of cortical bone non destructively...
May 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28497610/epilepsia-partialis-continua-after-an-anterior-circulation-ischaemic-stroke
#11
C Bentes, A C Franco, A R Peralta, P Viana, H Martins, C Morgado, C Casimiro, C Fonseca, R Geraldes, P Canhão, T Pinho E Melo, T Paiva, J M Ferro
BACKGROUND AND PURPOSE: Although cerebrovascular disorders are the main cause of epilepsia partialis continua (EPC) in adulthood, the frequency of EPC after stroke is unknown. The aim was to prospectively ascertain its frequency 1 year after an ischaemic stroke. METHODS: This was a prospective study of consecutive acute anterior circulation ischaemic stroke patients, previously independent, with an admission National Institutes of Health Stroke Scale score ≥4, an acute ischaemic lesion on imaging and no previous epileptic seizures...
May 12, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28494639/photocatalytic-degradation-of-polyvinylpyrrolidone-in-aqueous-solution-using-tio2-h2o2-uv-system
#12
Jaqueline Suave, Humberto Jorge José, Regina de Fatima Peralta Muniz Moreira
The photocatalytic degradation of high molecular weight polyvinylpyrrolidone (PVP), a water-soluble polymer, using a TiO2/H2O2/UV system was studied in an annular photoreactor using a mercury vapour lamp (125 W) as the radiation source. The effect of the initial hydrogen peroxide concentration and the operating conditions, such as initial concentration of PVP, photocatalyst dosage and initial pH, on the reaction rate were also evaluated. It was observed that the efficiency of the TiO2/H2O2/UV system was 33% higher than a system without H2O2, reaching total organic carbon removals of above 80% in 6 h of reaction, depending on the experimental conditions...
May 12, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28488096/improving-risk-assessment-for-post-surgical-low-cardiac-output-syndrome-in-patients-without-severely-reduced-ejection-fraction-undergoing-open-aortic-valve-replacement-the-role-of-global-longitudinal-strain-and-right-ventricular-free-wall-strain
#13
K Balderas-Muñoz, H Rodríguez-Zanella, J F Fritche-Salazar, N Ávila-Vanzzini, L E Juárez Orozco, J A Arias-Godínez, O Calvillo-Argüelles, S Rivera-Peralta, J C Sauza-Sosa, M E Ruiz-Esparza, E Bucio-Reta, A Rómero, N Espinola-Zavaleta, B Domínguez-Mendez, M Gaxiola-Macias, M A Martínez-Ríos
Low cardiac output syndrome (LCOS) after surgical aortic valve replacement (SAVR) is related to increased mortality and treatment related costs. We aimed to evaluate whether echocardiography-derived left ventricular global longitudinal strain (LV-GLS) relates to the occurrence of postoperative LCOS in patients undergoing SAVR. We prospectively enrolled 75 patients with symptomatic severe aortic stenosis, left ventricular ejection fraction (LVEF) >40%, NYHA Class <IV, without other significant valve disease...
May 9, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28486201/novel-spectrofluorimetric-method-for-boldine-alkaloid-determination-in-herbal-drugs-and-phytopharmaceuticals
#14
Cecilia M Peralta, Cecilia Henestrosa, Raúl A Gil, Liliana P Fernández, Gimena Acosta
A new green on-line method for Boldine determination (BOL) in herbal drugs and phytopharmaceuticals, using its native fluorescence in acid media (λex=282nm; λem=373nm) has been developed. The presented methodology involves for the first time, a flow injection (FI) strategy using a mini-column of multiwalled carbon nanotubes as retention agent coupled with molecular fluorescence. Different parameters influence as sample pH and flow rate, eluent flow rate and composition; on BOL sensitivity and elution time was investigated by multifactorial techniques...
April 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28475896/the-rna-exosome-syncs-iav-rnapii-transcription-to-promote-viral-ribogenesis-and-infectivity
#15
Alexander Rialdi, Judd Hultquist, David Jimenez-Morales, Zuleyma Peralta, Laura Campisi, Romain Fenouil, Natasha Moshkina, Zhen Zhen Wang, Brice Laffleur, Robyn M Kaake, Michael J McGregor, Kelsey Haas, Evangelos Pefanis, Randy A Albrecht, Lars Pache, Sumit Chanda, Joanna Jen, Jordi Ochando, Minji Byun, Uttiya Basu, Adolfo García-Sastre, Nevan Krogan, Harm van Bakel, Ivan Marazzi
The nuclear RNA exosome is an essential multi-subunit complex that controls RNA homeostasis. Congenital mutations in RNA exosome genes are associated with neurodegenerative diseases. Little is known about the role of the RNA exosome in the cellular response to pathogens. Here, using NGS and human and mouse genetics, we show that influenza A virus (IAV) ribogenesis and growth are suppressed by impaired RNA exosome activity. Mechanistically, the nuclear RNA exosome coordinates the initial steps of viral transcription with RNAPII at host promoters...
May 4, 2017: Cell
https://www.readbyqxmd.com/read/28474391/soil-microbial-community-composition-in-tallgrass-prairie-restorations-converge-with-remnants-across-a-27-year-chronosequence
#16
Nicholas A Barber, Karley M Chantos-Davidson, Rene Amel Peralta, Jared P Sherwood, Wesley D Swingley
Restoration and management of natural ecosystems is a critical strategy in mitigating global biodiversity loss. This is exemplified in the American Midwest by efforts aimed at reclaiming historical grasslands lost to high-yield agriculture. While restorations traditionally take the form of plant reintroduction and management, advances in microbial analyses suggest that soil communities could be indicators of restoration success. However, current understanding of key microbial taxa and functional activities in both natural and restored ecosystems is limited...
May 4, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28456327/impact-of-vitiligo-on-quality-of-life
#17
M A Morales-Sánchez, M Vargas-Salinas, M L Peralta-Pedrero, M G Olguín-García, F Jurado-Santa Cruz
INTRODUCTION AND OBJECTIVE: Vitiligo is a chronic autoimmune skin disease caused by the destruction of melanocytes. Although quality of life (QOL) in vitiligo has been studied in different countries, it has not yet been investigated in Mexico. The aim of this study was to assess the QOL of Mexican patients with vitiligo. MATERIAL AND METHOD: We conducted a cross-sectional study at the research unit of Centro Dermatológico Dr. Ladislao de la Pascua in Mexico City...
April 26, 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/28453583/-validation-of-the-successful-aging-inventory-in-chilean-older-people
#18
Lorena Gallardo-Peralta, Alejandro Cuadra-Peralta, Ximena Cámara-Rojo, Betty Gaspar-Delpino, Renato Sánchez-Lillo
BACKGROUND: There is a paucity of adequate and validated instruments for the measurement of successful aging for geriatric researchers in Chile. AIM: To validate the “Successful Aging Inventory” (SAI) in Chilean older people. MATERIAL AND METHODS: SAI was answered by 777 older people aged 70 ± 7 years (63% women) living in urban and rural areas, including the highlands of a Northern desert region of Chile. RESULTS: A Cronbach alfa of 0...
February 2017: Revista Médica de Chile
https://www.readbyqxmd.com/read/28448940/modulation-of-cuo-nanoparticles-toxicity-to-green-pea-pisum-sativum-fabaceae-by-the-phytohormone-indole-3-acetic-acid
#19
Loren Ochoa, Illya A Medina-Velo, Ana C Barrios, Nestor J Bonilla-Bird, Jose A Hernandez-Viezcas, Jose R Peralta-Videa, Jorge L Gardea-Torresdey
The response of plants to copper oxide nanoparticles (nano-CuO) in presence of exogenous phytohormones is unknown. In this study, green pea (Pisum sativum) plants were cultivated to full maturity in soil amended with nano-CuO (10-100nm, 74.3% Cu), bulk-CuO (bCuO, 100-10,000nm, 79.7% Cu), and CuCl2 at 50 and 100mg/kg and indole-3-acetic acid (IAA) at 10 and 100μM. Results showed that IAA at 10 and 100μM, averaged over all Cu treatments, reduced the number of plants by ~23% and ~34%, respectively. IAA at 10μM, nano-CuO at 50mg/kg, b-CuO at 50mg/kg, and CuCl2 at 100mg/kg reduced pod biomass by about 50%...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28446537/post-hoc-analyses-of-randomized-clinical-trial-for-the-effect-of-clopidogrel-added-to-aspirin-on-kidney-function
#20
Jesse C Ikeme, Pablo E Pergola, Rebecca Scherzer, Michael G Shlipak, Oscar R Benavente, Carmen A Peralta
BACKGROUND AND OBJECTIVES: Despite the high burden of CKD, few specific therapies are available that can halt disease progression. In animal models, clopidogrel has emerged as a potential therapy to preserve kidney function. The effect of clopidogrel on kidney function in humans has not been established. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: The Secondary Prevention of Small Subcortical Strokes Study randomized participants with prior lacunar stroke to treatment with aspirin or aspirin plus clopidogrel...
April 26, 2017: Clinical Journal of the American Society of Nephrology: CJASN
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