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https://www.readbyqxmd.com/read/28107468/micro-x-ray-computed-tomography-mass-loss-assessment-of-different-uhmwpe-a-hip-joint-simulator-study-on-standard-vs-cross-linked-polyethylene
#1
Saverio Affatato, Filippo Zanini, Simone Carmignato
More than 60.000 hip arthroplasty are performed every year in Italy. Although Ultra-High-Molecular-Weight-Polyethylene remains the most used material as acetabular cup, wear of this material induces over time in vivo a foreign-body response and consequently osteolysis, pain, and the need of implant revision. Furthermore, oxidative wear of the polyethylene provoke several and severe failures. To solve these problems, highly cross-linked polyethylene and Vitamin-E-stabilized polyethylene were introduced in the last years...
2017: PloS One
https://www.readbyqxmd.com/read/28106788/comparison-of-gastric-versus-gastrointestinal-pbet-extractions-for-estimating-oral-bioaccessibility-of-metals-in-house-dust
#2
Kristina Boros, Danielle Fortin, Innocent Jayawardene, Marc Chénier, Christine Levesque, Pat E Rasmussen
Oral bioaccessibility estimates for six metals which are prevalent as contaminants in Canada (zinc, lead, cadmium, copper, nickel, and chromium) are investigated for house dust using the simple gastric phase versus the two-phase physiologically-based extraction technique (PBET). The purpose is to determine whether a complete gastrointestinal (GI) assay yields a more conservative (i.e., higher) estimate of metal bioaccessibility in house dust than the gastric phase alone (G-alone). The study samples include household vacuum dust collected from 33 homes in Montreal, Canada, plus four certified reference materials (NIST 2583, NIST 2584, NIST 2710 and NIST 2710a)...
January 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28106265/effects-of-self-carbon-dioxide-generation-material-for-active-packaging-on-ph-water-holding-capacity-meat-color-lipid-oxidation-and-microbial-growth-in-beef-during-cold-storage
#3
Seung Jae Lee, Seung Yun Lee, Gap Don Kim, Geun Bae Kim, Sang Keun Jin, Sun Jin Hur
BACKGROUND: Active packaging refers to the mixing of additive agents into packagingmaterials with the purpose of hold or extending food product quality and shelf life. The purpose of this study was to develop an easy and cheap active packaging in beef. Beef loin samples were divided into 3 packaging groups (C: ziplock bag-packaging, T1: vacuum-packaging, T2: active-packaging) and stored at 4 °C for 21 days. RESULTS: The water-holding capacity was significantly (p < 0...
January 20, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28105903/criteria-to-define-a-more-relevant-reference-sample-of-titanium-dioxide-in-the-context-of-food-a-multiscale-approach
#4
William Dudefoi, Hélène Terrisse, Mireille Richard-Plouet, Eric Gautron, Florin Popa, Bernard Humbert, Marie-Hélène Ropers
Titanium dioxide (TiO2) is a transition metal oxide widely used as a white pigment in various applications, including food. Due to the classification of TiO2 nanoparticles as potentially harmful for humans by inhalation (IARC, 2006), the presence of nanoparticles in food products needed to be confirmed by a set of independent studies. Seven samples of food grade titanium dioxide (E171) were extensively characterised for their size distribution, crystallinity, and surface properties by the currently recommended methods...
January 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28105805/towards-3d-chemical-imaging-of-ternary-cu-sn-pb-alloys-using-femtosecond-laser-ablation-ionization-mass-spectrometry
#5
Valentine Grimaudo, Pavel Moreno-Garcia, Andreas Riedo, Stefan Meyer, Marek Tulej, Maike Brigitte Neuland, Miklós Mohos, Christoph Gütz, Siegfried R R Waldvogel, Peter Wurz, Peter Broekmann
Femtosecond Laser Ablation/Ionization Mass Spectrometry (LIMS) has been applied to probe the spatial element composition of three ternary Cu-Sn-Pb model bronze alloys (lead bronzes: CuSn10Pb10, CuSn7Pb15 and CuSn5Pb20), which were recently identified as high performance cathode materials in the context of electro-organic synthesis (dehalogenation, deoxygenation) of pharmaceutically relevant building blocks. The quantitative and spatially resolved element analysis of such cathode materials will help understanding the observed profound differences in their electrochemical reactivity and stability...
January 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28105473/recent-applications-of-the-combination-of-mesoporous-silica-nanoparticles-with-nucleic-acids-development-of-bioresponsive-devices-carriers-and-sensors
#6
REVIEW
Rafael R Castillo, Alejandro Baeza, María Vallet-Regí
The discovery and control of the biological roles mediated by nucleic acids have turned them into a powerful tool for the development of advanced biotechnological materials. Such is the importance of these gene-keeping biomacromolecules that even nanomaterials have succumbed to the claimed benefits of DNA and RNA. Currently, there could be found in the literature a practically intractable number of examples reporting the use of combination of nanoparticles with nucleic acids, so boundaries are demanded. Following this premise, this review will only cover the most recent and powerful strategies developed to exploit the possibilities of nucleic acids as biotechnological materials when in combination with mesoporous silica nanoparticles...
January 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28105472/macroporous-materials-microfluidic-fabrication-functionalization-and-applications
#7
REVIEW
Bingjie Wang, Pepijn Prinsen, Huizhi Wang, Zhishan Bai, Hualin Wang, Rafael Luque, Jin Xuan
This article provides an up-to-date highly comprehensive overview (594 references) on the state of the art of the synthesis and design of macroporous materials using microfluidics and their applications in different fields.
January 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28104489/changes-and-factors-associated-with-tobacco-counseling-results-from-the-aap-periodic-survey
#8
Robert McMillen, Karen G O'Connor, Judith Groner, Susanne Tanski, Elyse R Park, Jonathan D Klein
INTRODUCTION: The AAP advises pediatricians to counsel parents and patients who use tobacco to quit. This study assesses changes in counseling between 2004 and 2010, and factors associated with counseling in 2010. METHODS: In 2004 and 2010, the Periodic Survey, a national survey of AAP members, inquired about tobacco counseling. Chi-square tests were performed to compare responses by survey year. Bivariate and multivariable analyses examined factors associated with counseling...
January 16, 2017: Academic Pediatrics
https://www.readbyqxmd.com/read/28103921/manually-defining-regions-of-interest-when-quantifying-paravertebral-muscles-fatty-infiltration-from-axial-magnetic-resonance-imaging-a-proposed-method-for-the-lumbar-spine-with-anatomical-cross-reference
#9
Rebecca J Crawford, Jon Cornwall, Rebecca Abbott, James M Elliott
BACKGROUND: There is increasing interest in paravertebral muscle composition as a potential prognostic and diagnostic element in lumbar spine health. As a consequence, it is becoming popular to use magnetic resonance imaging (MRI) to examine muscle volume and fatty infiltration in lumbar paravertebral muscles to assess both age-related change and their clinical relevance in low back pain (LBP). A variety of imaging methods exist for both measuring key variables (fat, muscle) and for defining regions of interest, making pooled comparisons between studies difficult and rendering post-production analysis of MRIs confusing...
January 19, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28103710/radiography-and-abdominal-ct-compared-with-sacroiliac-joint-ct-in-the-diagnosis-of-sacroiliitis
#10
Julian Melchior, Yusef Azraq, Isabelle Chary-Valckenaere, Anne-Christine Rat, Pedro Texeira, Alain Blum, Damien Loeuille
Background The presence of structural sacroiliitis is strong evidence for the diagnosis of spondyloarthritis (SpA). Purpose To assess the performance of abdominal computed tomography (CT) and pelvic plain radiography for the diagnosis of structural sacroiliitis compared with sacroiliac CT (SI joint CT) considered the reference technique in patients with SpA. Material and Methods All SpA patients eligible for biologic treatment were selected from 2005 to 2012. An assessment of sacroiliitis was based on radiography according to the modified New York criteria and on abdominal CT and SI joint CT scans depending on the presence of erosion on at least two consecutive slices...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28103514/pva-matches-human-liver-in-needle-tissue-interaction
#11
Tonke L de Jong, Loes H Pluymen, Dennis J van Gerwen, Gert-Jan Kleinrensink, Jenny Dankelman, John J van den Dobbelsteen
Medical phantoms can be used to study needle-tissue interaction and to train medical residents. The purpose of this research is to study the suitability of polyvinyl alcohol (PVA) as a liver tissue mimicking material in terms of needle-tissue interaction. Insertions into ex-vivo human livers were used for reference. Six PVA samples were created by varying the mass percentage of PVA to water (4m% and 7m%) and the number of freeze-thaw cycles (1, 2 and 3 cycles, 16hours of freezing at -19°C, 8hours of thawing)...
January 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28100602/find-tuberculosis-strain-bank-a-resource-for-researchers-and-developers-working-on-tests-to-detect-mycobacterium-tuberculosis-and-related-drug-resistance
#12
Belay Tessema, Pamela Nabeta, Eloise Valli, Audrey Albertini, Jimena Collantes, Nguyen Huu Lan, Elena Romancenco, Nestani Tukavdze, Claudia M Denkinger, David L Dolinger
BACKGROUND: The spread of multidrug-resistant tuberculosis and extensively drug-resistant TB hampers the global efforts in the fight against tuberculosis. To enhance the development and evaluation of diagnostic tests quickly and efficiently, well characterized strains and samples from drug resistant tuberculosis patients are necessary. In this project, FIND has focused on the collection, characterization and storage of such well-characterized reference materials and to make them available to researchers and developers...
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28099156/quasi-monochromatic-imaging-in-x-ray-ct-via-spectral-deconvolution-using-photon-counting-detectors
#13
Sen Wang, Li Zhang, Dufan Wu, Xiaofei Xu
Photon counting detectors can obtain the spectral information of incident x-ray spectrum while the detected counts may differ from the incident counts due to detector response. If uncorrected or uncompensated, the response will lead to distortion in CT reconstruction. With the intention of reducing the distortion and exploring the potential of photon counting detectors, a novel reconstruction strategy with spectral deconvolution is proposed in this paper which attempts to set itself apart from traditional material decomposition framework...
January 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28098824/fabrication-of-a-miniature-multi-parameter-sensor-chip-for-water-quality-assessment
#14
Bo Zhou, Chao Bian, Jianhua Tong, Shanhong Xia
Water contamination is a main inducement of human diseases. It is an important step to monitor the water quality in the water distribution system. Due to the features of large size, high cost, and complicated structure of traditional water determination sensors and devices, it is difficult to realize real-time water monitoring on a large scale. In this paper, we present a multi-parameter sensor chip, which is miniature, low-cost, and robust, to detect the pH, conductivity, and temperature of water simultaneously...
January 14, 2017: Sensors
https://www.readbyqxmd.com/read/28097682/evaluation-of-perforated-demineralized-dentin-scaffold-on-bone-regeneration-in-critical-size-sheep-iliac-defects
#15
Md Arafat Kabir, Masaru Murata, Toshiyuki Akazawa, Kaoru Kusano, Katsuhisa Yamada, Manabu Ito
OBJECTIVES: Regenerating critical-size bone injury is a major problem that continues to inspire the design of new graft materials. Therefore, tissue engineering has become a novel approach for targeting bone regeneration applications. Human teeth are a rich source of stem cells, matrix, trace metal ions, and growth factors. A vital tooth-derived demineralized dentin matrix is acid-insoluble and composed of cross-linked collagen with growth factors. In this study, we recycled human non-functional tooth into a unique geometric dentin scaffold, entitled perforated root-demineralized dentin matrix (PR-DDM)...
January 17, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28097249/application-of-a-3d-custom-printed-patient-specific-spinal-implant-for-c1-2-arthrodesis
#16
Kevin Phan, Alessandro Sgro, Monish M Maharaj, Paul D'Urso, Ralph J Mobbs
The study aims to describe a three-dimensional printed (3DP) posterior fixation implant used for C1/C2 fusion in a 65-year-old female. Spinal fusion remains a common intervention for a range of spinal pathologies including degenerative disc and facet disease when conservative methods are unsuccessful. However, fusion devices are not always entirely efficacious in providing the desired fixation, and surgeons rely on 'off the shelf' implants which may not provide an anatomical fit to address the particular pathology...
December 2016: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/28095204/democratizing-lgbtq-history-online-digitizing-public-history-in-u-s-homophile-internationalism
#17
Tamara de Szegheo Lang
This article argues that the online archive and exhibit "U.S. Homophile Internationalism" effectively contributes to the democratizing effects that digital archives and online initiatives are having on the practice of history. "U.S. Homophile Internationalism" is an online archive of over 800 digitized articles, letters, advertisements, and other materials from the U.S. homophile press that reference six non-U.S. regions of the world. It also provides visitors with introductory regional essays, annotated bibliographies, and an interactive map feature...
January 17, 2017: Journal of Homosexuality
https://www.readbyqxmd.com/read/28094933/accurate-gas-phase-formation-enthalpies-of-alloys-and-refractories-decomposition-products
#18
Yury Minenkov, Valery V Sliznev, Luigi Cavallo
Accurate gas phase formation enthalpies, ΔHf, of metal oxides and halides are critical for the prediction of the stability of high temperature materials used in the aerospace and nuclear industries. Unfortunately, the experimental ΔHf values of these compounds in the most used databases, such as the NIST-JANAF database, are often reported with large inaccuracy, while some other ΔHf values clearly differ from the value predicted by CCSD(T) methods. To address this point, in this work we systematically predicted the ΔHf values of a series of these compounds having a group 4, 6, or 14 metal...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28094534/in-vitro-assessment-of-skin-irritation-potential-of-surfactant-based-formulations-by-using-a-3-d-skin-reconstructed-tissue-model-and-cytokine-response
#19
Russel M Walters, Lisa Gandolfi, M Catherine Mack, Michael Fevola, Katharine Martin, Mathew T Hamilton, Allison Hilberer, Nicole Barnes, Nathan Wilt, Jennifer R Nash, Hans A Raabe, Gertrude-Emilia Costin
The personal care industry is focused on developing safe, more efficacious, and increasingly milder products, that are routinely undergoing preclinical and clinical testing before becoming available for consumer use on skin. In vitro systems based on skin reconstructed equivalents are now established for the preclinical assessment of product irritation potential and as alternative testing methods to the classic Draize rabbit skin irritation test. We have used the 3-D EpiDerm™ model system to evaluate tissue viability and primary cytokine interleukin-1α release as a way to evaluate the potential dermal irritation of 224 non-ionic, amphoteric and/or anionic surfactant-containing formulations, or individual raw materials...
December 2016: Alternatives to Laboratory Animals: ATLA
https://www.readbyqxmd.com/read/28094038/triaging-hpv-positive-women-with-p16-ki-67-dual-stained-cytology-results-from-a-sub-study-nested-into-the-athena-trial
#20
Thomas C Wright, Catherine M Behrens, James Ranger-Moore, Susanne Rehm, Abha Sharma, Mark H Stoler, Ruediger Ridder
OBJECTIVES: In addition to genotyping for HPV16/18, dual-immunostaining for p16/Ki-67 has shown promise as a triage of HPV-positive women. We assessed the performance of p16/Ki-67 dual-stained cytology for triaging HPV-positive women undergoing primary HPV screening. METHODS: All women ≥25years with valid cervical biopsy and cobas® HPV Test results from the cross-sectional phase of ATHENA who were referred to colposcopy (n=7727) were eligible for enrolment. p16/Ki-67 dual-stained cytology was retrospectively performed on residual cytologic material collected into a second liquid-based cytology vial during the ATHENA enrolment visit...
January 2017: Gynecologic Oncology
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