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https://www.readbyqxmd.com/read/27911908/uptake-of-community-based-peer-administered-hiv-point-of-care-testing-findings-from-the-proud-study
#1
Lisa Lazarus, Sheetal Patel, Ashley Shaw, Sean Leblanc, Christine Lalonde, Manisha Hladio, Kira Mandryk, Cynthia Horvath, William Petrcich, Claire Kendall, Mark W Tyndall
OBJECTIVES: HIV prevalence among people who inject drugs (PWID) in Ottawa is estimated at about 10%. The successful integration of peers into outreach efforts and wider access to HIV point-of-care testing (POCT) create opportunities to explore the role of peers in providing HIV testing. The PROUD study, in partnership with Ottawa Public Health (OPH), sought to develop a model for community-based peer-administered HIV POCT. METHODS: PROUD draws on community-based participatory research methods to better understand the HIV risk environment of people who use drugs in Ottawa...
2016: PloS One
https://www.readbyqxmd.com/read/27911378/iridium-oxide-reduced-graphene-oxide-nanohybrid-thin-film-modified-screen-printed-electrodes-as-disposable-electrochemical-paper-microfluidic-ph-sensors
#2
Jiang Yang, Tae-Joon Kwak, Xiaodong Zhang, Robert McClain, Woo-Jin Chang, Sundaram Gunasekaran
A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use integrated paper microfluidic electrochemical pH sensor for resource-limited settings. Taking advantages from both pH meters and strips, the pH sensing platform is composed of hydrophobic barrier-patterned paper micropad (µPAD) using polydimethylsiloxane (PDMS), screen-printed electrode (SPE) modified with IrO2-graphene films and molded acrylonitrile butadiene styrene (ABS) plastic holder...
November 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910889/direct-imaging-of-defect-formation-in-strained-organic-flexible-electronics-by-scanning-kelvin-probe-microscopy
#3
Tobias Cramer, Lorenzo Travaglini, Stefano Lai, Luca Patruno, Stefano de Miranda, Annalisa Bonfiglio, Piero Cosseddu, Beatrice Fraboni
The development of new materials and devices for flexible electronics depends crucially on the understanding of how strain affects electronic material properties at the nano-scale. Scanning Kelvin-Probe Microscopy (SKPM) is a unique technique for nanoelectronic investigations as it combines non-invasive measurement of surface topography and surface electrical potential. Here we show that SKPM in non-contact mode is feasible on deformed flexible samples and allows to identify strain induced electronic defects...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27907827/similarity-assessment-of-acoustic-emission-signals-and-its-application-in-source-localization
#4
Shiwan Chen, Chunhe Yang, Guibin Wang, Wei Liu
In conventional AE source localization acoustic emission (AE) signals are applied directly to localize the source without any waveform identification or quality evaluation, which always leads to large errors in source localization. To improve the reliability and accuracy of acoustic emission source localization, an identification procedure is developed to assess the similarity of AE signals to select signals with high quality to localize the AE source. Magnitude square coherence (MSC), wavelet coherence and dynamic timing warping (DTW) are successively applied for similarity assessment...
November 14, 2016: Ultrasonics
https://www.readbyqxmd.com/read/27906168/immunofluorescent-antibody-staining-of-intact-drosophila-larvae
#5
Laurina Manning, Chris Q Doe
Antibody staining is a vital technique for studying the development of many model organisms, including Drosophila. Reliable protocols have long been available for antibody staining of Drosophila whole-mount embryos and dissected larvae. By contrast, methods for staining whole larvae have rarely been reported, are unreliable, and fail to work on large third-instar larvae. This has become a major limitation to understanding the role of multitissue interactions such as neural circuit formation and cell metastasis...
January 2017: Nature Protocols
https://www.readbyqxmd.com/read/27905673/single-versus-multiple-visits-for-endodontic-treatment-of-permanent-teeth
#6
REVIEW
Maddalena Manfredi, Lara Figini, Massimo Gagliani, Giovanni Lodi
BACKGROUND: Root canal treatment (RoCT), or endodontic treatment, is a common procedure in dentistry. The main indications for RoCT are irreversible pulpitis and necrosis of the dental pulp caused by carious processes, tooth cracks or chips, or dental trauma. Successful RoCT is characterised by an absence of symptoms (i.e. pain) and clinical signs (i.e. swelling and sinus tract) in teeth without radiographic evidence of periodontal involvement (i.e. normal periodontal ligament). The success of RoCT depends on a number of variables related to the preoperative condition of the tooth, as well as the endodontic procedures...
December 1, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27898863/rapid-communication-expression-of-an-endogenous-retroviral-element-during-early-gestation-in-beef-heifers
#7
K J McLean, M S Crouse, M R Crosswhite, D N Black, C R Dahlen, P P Borowicz, L P Reynolds, A K Ward, B W Neville, J S Caton
Endogenous retroviral gene elements have been implicated in development and formation of the feto-maternal interface. A variant of the syncytin endogenous retroviral envelope gene family, , was recently found in ruminants. We hypothesized that mRNA would be differentially expressed in utero-placental tissues and would fluctuate during key time points of early gestation in beef heifers. Commercial Angus crossbred heifers ( = 46; ∼15 mo of age; BW = 362.3 ± 34.7kg) housed in 6-animal pens were fed daily with native grass hay and supplemented with cracked corn to gain 0...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898442/epidemiology-of-pathologic-myopia-in-asia-and-worldwide
#8
Yee-Ling Wong, Seang-Mei Saw
The myopia epidemic in Asia is evident because the prevalence of high myopia among young adults is higher among Asian (6.8%-21.6%) compared with non-Asian populations (2.0%-2.3%). High myopia is linked to pathologic myopia (PM), which may cause irreversible visual impairment (VI). This review will highlight updates on the prevalence of PM and the associated VI from PM. The prevalence of PM among the middle-aged and elderly (0.9%-3.1%) is higher than the prevalence among children and adolescents (<0.2%). The PM lesions detected among older adults include advanced lesions, such as posterior staphyloma, chorioretinal atrophy, lacquer cracks, and Fuchs spot (in descending frequency of occurrence)...
November 2016: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/27897977/design-and-fabrication-of-micro-hemispheric-shell-resonator-with-annular-electrodes
#9
Renxin Wang, Bing Bai, Hengzhen Feng, Ziming Ren, Huiliang Cao, Chenyang Xue, Binzhen Zhang, Jun Liu
Electrostatic driving and capacitive detection is widely used in micro hemispheric shell resonators (HSR). The capacitor gap distance is a dominant factor for the initial capacitance, and affects the driving voltage and sensitivity. In order to decrease the equivalent gap distance, a micro HSR with annular electrodes fabricated by a glassblowing method was developed. Central and annular cavities are defined, and then the inside gas drives glass softening and deformation at 770 °C. While the same force is applied, the deformation of the hemispherical shell is about 200 times that of the annular electrodes, illustrating that the deformation of the electrodes will not affect the measurement accuracy...
November 25, 2016: Sensors
https://www.readbyqxmd.com/read/27897210/fabrication-of-ws2-gan-p-n-junction-by-wafer-scale-ws2-thin-film-transfer
#10
Yang Yu, Patrick W K Fong, Shifeng Wang, Charles Surya
High quality wafer-scale free-standing WS2 grown by van der Waals rheotaxy (vdWR) using Ni as a texture promoting layer is reported. The microstructure of vdWR grown WS2 was significantly modified from mixture of crystallites with their c-axes both parallel to (type I) and perpendicular to (type II) the substrate to large type II crystallites. Wafer-scale transfer of vdWR grown WS2 onto different substrates by an etching-free technique was demonstrated for the first time that utilized the hydrophobic property of WS2 and hydrophilic property of sapphire...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896808/the-effects-of-cracks-on-the-quantification-of-the-cancellous-bone-fabric-tensor-in-fossil-and-archaeological-specimens-a-simulation-study
#11
Peter J Bishop, Christofer J Clemente, Scott A Hocknull, Rod S Barrett, David G Lloyd
Cancellous bone is very sensitive to its prevailing mechanical environment, and study of its architecture has previously aided interpretations of locomotor biomechanics in extinct animals or archaeological populations. However, quantification of architectural features may be compromised by poor preservation in fossil and archaeological specimens, such as post mortem cracking or fracturing. In this study, the effects of post mortem cracks on the quantification of cancellous bone fabric were investigated through the simulation of cracks in otherwise undamaged modern bone samples...
November 29, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/27894051/the-influence-of-sr-on-the-microstructure-degradation-and-stress-corrosion-cracking-of-the-mg-alloys-zk40xsr
#12
Lianxi Chen, Yuanhong Bin, Wenqi Zou, Xiaojian Wang, Wei Li
In the present work, new magnesium (Mg) alloys (Mg-4Zn-0.6Zr-xSr, x=0, 0.4, 0.8, 1.2, 1.6wt%; ZK40xSr) were prepared and studied as potential biodegradable materials. The influence of strontium (Sr) addition on the properties of the new Mg alloys was investigated, which included microstructure, corrosion degradation, and the stress corrosion cracking (SCC) susceptibility. The average grain size of the ZK40Sr was approximately 100µm, which was significantly smaller than that of ZK40 alloy without Sr (402.3±40...
November 18, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27892564/zirconia-based-dental-ceramics-structure-mechanical-properties-biocompatibility-and-applications
#13
Chandkiram Gautam, Jarin Joyner, Amarendra Gautam, Jitendra Rao, Robert Vajtai
Zirconia (ZrO2) based dental ceramics have been considered to be advantageous materials with adequate mechanical properties for the manufacturing of medical devices. Due to its very high compression strength of 2000 MPa, ZrO2 can resist differing mechanical environments. During the crack propagation on the application of stress on the surface of ZrO2, a crystalline modification diminishes the propagation of cracks. In addition, zirconia's biocompatibility has been studied in vivo, leading to the observation of no adverse response upon the insertion of ZrO2 samples into the bone or muscle...
November 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27890969/behavior-of-post-installed-anchors-tested-by-stepwise-increasing-cyclic-load-protocols
#14
Philipp Mahrenholtz, Rolf Eligehausen, Tara C Hutchinson, Matthew S Hoehler
Cyclic loads are a characteristic feature of actions acting on structures and anchorages during earthquakes. For this reason, seismic qualification of post-installed concrete anchors according to the internationally recognized American Concrete Institute (ACI) standard ACI 355 is based on cyclic load tests. The protocols for these tests, however, have limited scientific basis. Therefore, in the present paper newly-developed test protocols with stepwise-increasing load amplitudes are utilized to more realistically evaluate anchor seismic performance...
September 2016: ACI Struct J
https://www.readbyqxmd.com/read/27890420/blow-winds-and-crack-your-cheeks
#15
EDITORIAL
P Mackie, F Sim
No abstract text is available yet for this article.
November 24, 2016: Public Health
https://www.readbyqxmd.com/read/27888728/estimating-total-lipid-content-of-camelina-sativa-via-pyrolysis-assisted-in-situ-transesterification-with-dimethyl-carbonate
#16
Jong-Min Jung, Jechan Lee, Jeong-Ik Oh, Hyung-Wook Kim, Eilhann E Kwon
Direct derivatization of C. sativa seed into FAMEs without lipid extraction was conducted for the quantification of lipid analysis via in-situ thermal methylation with dimethyl carbonate as an acyl acceptor on silica (SiO2). The introduced method had an extraordinarily high tolerance against impurities such as pyrolytic products and moisture. To ensure the technical completeness of in-situ methylation, thermal cracking of FAMEs transformed from C. sativa seed was also explored. Thermal cracking of unsaturated FAMEs such as C18:1, C18:2, C18:3 and C20:1 occurred at temperatures higher than 365°C due to their thermal instability...
November 16, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27888361/morphological-and-structural-characterization-of-the-attachment-system-in-aerial-roots-of-syngonium-podophyllum
#17
Xiaojun Yang, Wenli Deng
The attachment of aerial roots of Syngonium podophyllum involves a multi-step process adjusted by multi-scale structures. Helical-crack root hairs are first found in the attachment system, representing specialized structures for surface anchorage. The morphological variability of attachment organs reflects diverse climbing strategies. One such anchoring mode in clinging-climbers involves the time-dependent interaction between roots and the support: By naturally occurring adhesive roots with root hairs, the plant can ascend on supports of any shape and size...
November 25, 2016: Planta
https://www.readbyqxmd.com/read/27882902/observation-of-the-flexoelectricity-of-a-srtio3-single-crystal-by-x-ray-absorption-and-emission-spectroscopies
#18
C Lu, N Nakajima, H Maruyama
Flexoelectricity, defined as the spontaneous electric polarization in a dielectric material induced by a strain gradient, is investigated from the microscopic viewpoint by x-ray spectroscopy. A single crystal SrTiO3 sample was used as a test system in order to reveal the appearance of the electric dipole moment by simple bending of the crystal. The spectral change characteristic of ferroelectric transition in SrTiO3 was not observed in the Ti K-edge absorption spectra. Instead, the gradual decrease (increase) of the post-edge feature (pre-edge structure) by bending was qualitatively explained using theoretical calculations that assumed the presence of oxygen vacancies and a slight crystal distortion...
November 24, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27879649/probabilistic-model-updating-for-sizing-of-hole-edge-crack-using-fiber-bragg-grating-sensors-and-the-high-order-extended-finite-element-method
#19
Jingjing He, Jinsong Yang, Yongxiang Wang, Haim Waisman, Weifang Zhang
This paper presents a novel framework for probabilistic crack size quantification using fiber Bragg grating (FBG) sensors. The key idea is to use a high-order extended finite element method (XFEM) together with a transfer (T)-matrix method to analyze the reflection intensity spectra of FBG sensors, for various crack sizes. Compared with the standard FEM, the XFEM offers two superior capabilities: (i) a more accurate representation of fields in the vicinity of the crack tip singularity and (ii) alleviation of the need for costly re-meshing as the crack size changes...
November 21, 2016: Sensors
https://www.readbyqxmd.com/read/27879496/death-due-to-pulmonary-alveolar-proteinosis
#20
Emran Altaf, Erik K Mitchel, Chris Berry, Altaf Hossain
Presented are 2 cases of death from pulmonary alveolar proteinosis (PAP). Within the past 2 years, there have been 2 cases of rare nonneoplastic lung disease that consists of the filling of the alveoli of the lung by a periodic acid-Schiff stain-positive lipoproteinaceous material. This condition bears a certain resemblance to interstitial lung disease and/or Pneumocystitis jirovecci infection of the lungs. The presented cases were clinically diagnosed as interstitial lung disease. In the first case presented, the decedent was admitted to hospital with diagnosis of pneumonia but died in hospital despite observation and treatment...
November 23, 2016: American Journal of Forensic Medicine and Pathology
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