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https://www.readbyqxmd.com/read/29036935/laser-powder-cladding-of-ti-6al-4v-%C3%AE-%C3%AE-alloy
#1
Samar Reda Al-Sayed Ali, Abdel Hamid Ahmed Hussein, Adel Abdel Menam Saleh Nofal, Salah Elden Ibrahim Hasseb Elnaby, Haytham Abdelrafea Elgazzar, Hassan Abdel Sabour
Laser cladding process was performed on a commercial Ti-6Al-4V (α + β) titanium alloy by means of tungsten carbide-nickel based alloy powder blend. Nd:YAG laser with a 2.2-KW continuous wave was used with coaxial jet nozzle coupled with a standard powder feeding system. Four-track deposition of a blended powder consisting of 60 wt % tungsten carbide (WC) and 40 wt % NiCrBSi was successfully made on the alloy. The high content of the hard WC particles is intended to enhance the abrasion resistance of the titanium alloy...
October 15, 2017: Materials
https://www.readbyqxmd.com/read/29036921/transformation-of-cuo-nanoparticles-in-the-aquatic-environment-influence-of-ph-electrolytes-and-natural-organic-matter
#2
Cheng Peng, Chensi Shen, Siyuan Zheng, Weiling Yang, Hang Hu, Jianshe Liu, Jiyan Shi
Many studies have shown the effect of solution chemistry on the environmental behavior of metal-based nanoparticles (NPs), except CuO NPs. Here, we investigated the agglomeration, sedimentation, dissolution, and speciation of CuO NPs by varying pH, ionic strength, ionic valence, and natural organic matter (NOM). The results showed that as the pH moved away from 6, the size of CuO agglomerates decreased, along with the enhanced NP suspension stabilization, due to the increase of electrostatic repulsive force...
October 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29036898/highly-sensitive-and-selective-hydrogen-gas-sensor-using-the-mesoporous-sno%C3%A2-modified-layers
#3
Niuzi Xue, Qinyi Zhang, Shunping Zhang, Pan Zong, Feng Yang
It is important to improve the sensitivities and selectivities of metal oxide semiconductor (MOS) gas sensors when they are used to monitor the state of hydrogen in aerospace industry and electronic field. In this paper, the ordered mesoporous SnO₂ (m-SnO₂) powders were prepared by sol-gel method, and the morphology and structure were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). The gas sensors were fabricated using m-SnO₂ as the modified layers on the surface of commercial SnO₂ (c-SnO₂) by screen printing technology, and tested for gas sensing towards ethanol, benzene and hydrogen with operating temperatures ranging from 200 °C to 400 °C...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036879/enhancement-of-digital-radiography-image-quality-using-a-convolutional-neural-network
#4
Yuewen Sun, Litao Li, Peng Cong, Zhentao Wang, Xiaojing Guo
Digital radiography system is widely used for noninvasive security check and medical imaging examination. However, the system has a limitation of lower image quality in spatial resolution and signal to noise ratio. In this study, we explored whether the image quality acquired by the digital radiography system can be improved with a modified convolutional neural network to generate high-resolution images with reduced noise from the original low-quality images. The experiment evaluated on a test dataset, which contains 5 X-ray images, showed that the proposed method outperformed the traditional methods (i...
October 10, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29036735/facile-synthesis-and-characterization-of-l-aspartic-acid-coated-iron-oxide-magnetic-nanoparticles-ionps-for-biomedical-applications
#5
Marziyeh Salehiabar, Hamed Nosrati, Soodabeh Davaran, Hossein Danafar, Hamidreza Kheiri Manjili
Natural L-aspartic acid coated iron oxide magnetic nanoparticles (Asp@IONPs) were prepared by a one pot, in-situ and green co-precipitation method in an aqueous medium. Functionalized iron oxide magnetic nanoparticles (IONPs) were characterized by Vibrating Sample Magnetometer (VSM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) techniques. Cellular toxicity of IONPs was also investigated on HEK-293 cell lines...
October 16, 2017: Drug Research
https://www.readbyqxmd.com/read/29036608/insights-into-rna-polymerase-catalysis-and-adaptive-evolution-gained-from-mutational-analysis-of-a-locus-conferring-rifampicin-resistance
#6
Olga Yurieva, Vadim Nikiforov, Vadim Nikiforov, Michael O'Donnell, Arkady Mustaev
S531 of Escherichia coli RNA polymerase (RNAP) β subunit is a part of RNA binding domain in transcription complex. While highly conserved, S531 is not involved in interactions within the transcription complex as suggested by X-ray analysis. To understand the basis for S531 conservation we performed systematic mutagenesis of this residue. We find that the most of the mutations significantly decreased initiation-to-elongation transition by RNAP. Surprisingly, some changes enhanced the production of full-size transcripts by suppressing abortive loss of short RNAs...
September 25, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29036234/-radiolucent-and-opaque-lesions-on-a-panoramic-radiograph-a%C3%A2-cyst-or-not
#7
S A Zijderveld, J P A van den Bergh
In the context of pain diagnostics, several lesions, partially radiolucent and partially opaque, were identified by chance in the mandible and maxilla. On the basis of the characteristic x-ray image, it was assumed to be cemento-osseous dysplasia. At an early stage, this cannot easily be distinguished from apical periodontitis. An incorrect diagnosis could lead to needless endodontic treatment.
October 2017: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29036200/the-effect-of-the-pathological-v72i-d109n-and-t190m-missense-mutations-on-the-molecular-structure-of-%C3%AE-dystroglycan
#8
Sonia Covaceuszach, Manuela Bozzi, Maria Giulia Bigotti, Francesca Sciandra, Petr V Konarev, Andrea Brancaccio, Alberto Cassetta
Dystroglycan (DG) is a highly glycosylated protein complex that links the cytoskeleton with the extracellular matrix, mediating fundamental physiological functions such as mechanical stability of tissues, matrix organization and cell polarity. A crucial role in the glycosylation of the DG α subunit is played by its own N-terminal region that is required by the glycosyltransferase LARGE. Alteration in this O-glycosylation deeply impairs the high affinity binding to other extracellular matrix proteins such as laminins...
2017: PloS One
https://www.readbyqxmd.com/read/29036054/automated-angular-and-translational-tomographic-alignment-and-application-to-phase-contrast-imaging
#9
T Ramos, J S Jørgensen, J W Andreasen
X-ray computerized tomography (CT) is a 3D imaging technique that makes use of x-ray illumination and image reconstruction techniques to reproduce the internal cross-sections of a sample. Tomographic projection data usually require an initial relative alignment or knowledge of the exact object position and orientation with respect to the detector. As tomographic imaging reaches increasingly better resolution, thermal drifts, mechanical instabilities, and equipment limitations are becoming the main dominant factors contributing to sample positioning uncertainties that will further introduce reconstruction artifacts and limit the attained resolution in the final tomographic reconstruction...
October 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29036000/unilateral-submandibular-gland-atrophy-and-sialolithiasis-diagnosed-on-99mtc-mibi-spect-ct-in-a-patient-with-primary-hyperparathyroidism
#10
Puskar Pattanayak, Prasanna Santhanam, Mehrbod Som Javadi, Lilja B Solnes, Steven P Rowe
A variety of sequelae of elevated calcium levels are encountered in patients with underlying primary hyperparathyroidism, including stone formation such as calculi in the urinary tract and sialoliths in the salivary glands and ducts. We present a case of a 54-year-old woman with fatigue, myalgia, and poor concentration who was found to have hypercalcemia (corrected calcium, 11.2 mg/dL) and elevated parathyroid hormone level (112 pg/mL), laboratory values consistent with primary hyperparathyroidism. She underwent evaluation with a Tc-MIBI parathyroid SPECT scan that included x-ray CT acquisitions for anatomical localization and attenuation correction...
October 13, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29035845/radiation-reduction-in-the-pediatric-catheterization-laboratory-using-a-novel-imaging-system
#11
Stephen Manu, Patcharapong Suntharos, Gerard J Boyle, Lu Wang, Lourdes R Prieto
OBJECTIVES: Radiation dose was compared between two modern imaging systems with different x-ray tube technology (Megalix vs Gigalix) and detector type (amorphous vs crystalline silicon) at the same institution. BACKGROUND: Further reduction in radiation dose than currently reported may be achievable with advances in x-ray tube and detector technology. METHODS: Radiation dose (air kerma, dose-area product [DAP]) was retrospectively compared for post-transplant pediatric patients undergoing right heart catheterization/biopsy (fluoroscopy only) or "annual" catheterization with coronary angiography in one of two imaging systems between January 2014 and December 2016...
October 15, 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/29035841/verification-of-an-improved-hip-joint-center-prediction-method
#12
Emily J Miller, Kenton R Kaufman
In motion analysis, the hip joint center (HJC) is used to define the proximal location of the thigh segment and is also the point about which hip moments are calculated. The HJC cannot be palpated; its location must be calculated. Functional methods have been proposed but are difficult to perform by some clinical populations. Therefore, regression methods are utilized, but yield large errors in estimating the HJC location. These prediction methods typically utilize the anterior and posterior superior iliac spines, where excessive adipose tissue makes correctly locating difficult...
October 10, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29035811/moving-towards-fast-characterization-of-polymorphic-drugs-by-solid-state-nmr-spectroscopy
#13
Rosalynn Quiñones, Robbie J Iuliucci, Grayce Behnke, Ryanne Brown, Deben Shoup, Taylor M Riedel, Christine Plavchak, Brooke E Lininger, Jonathan M Spehar
Solid-state nuclear magnetic resonance (SS-NMR) spectroscopy has become a common technique to study polymorphism in pharmaceutical solids at high-resolution. However, high-throughput application of high resolution SS-NMR spectroscopy is severely limited by the long (1)H spin-lattice relaxation (T1) that is common to solid phase compounds. Here, we demonstrate the use of paramagnetic relaxation reagents such as chromium (III) acetylacetonate (Cr(acac)3) and nickel (II) acetylacetonate (Ni(acac)2) for fast data acquisition by significantly reducing the T1 value for carbamazepine Forms I, II, III, and dihydrate, cimetidine Forms A and B, nabumetone Form I, and acetaminophen Form I polymorphs...
October 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29035808/nh2-coordinately-immobilized-tris-8-quinolinolato-iron-onto-the-silica-coated-magnetite-nanoparticle-fe3o4-sio2-feq3-as-a-selective-fenton-like-catalyst-for-clean-oxidation-of-sulfides
#14
Sadegh Rostamnia, Behnam Gholipour, Xiao Liu, Yuan Wang, Hamidreza Arandiyan
A green, robust and eco-friendly procedure for the oxidation of aromatic organic sulfides to sulfones using H2O2 catalyzed by NH2-coordinately immobilized tris(8-quinolinolato)iron onto the silica coated magnetite (Fe3SiO6) has been developed. Physicochemical properties of the resulting nanoparticles were investigated by means of techniques including X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, vibrating sample magnetometer, atomic adsorption spectroscopy and FT-IR spectroscopy...
October 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29035752/regulation-of-oxidative-stress-and-mineral-nutrient-status-by-selenium-in-arsenic-treated-crop-plant-oryza-sativa
#15
R Singh, A K Upadhyay, D P Singh
The present study was conducted to examine the impact of selenium (Se) on mineral nutrient status and oxidative stress in crop plant Oryza sativa treated with arsenic (As). Scanning electron microscopy (SEM) coupled with Energy dispersive x-ray spectroscopy (EDS) study revealed the morphological deformities in leaf veins along with granular deposition on the leaf surface. The EDS analysis exhibited loss of elements (S, Si, Cl, K, Ca, Fe and Cu) in As(III) treatment in rice roots as compared to untreated root...
October 12, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29035747/studies-on-the-adsorption-and-desorption-of-mitoxantrone-to-lauric-acid-albumin-coated-iron-oxide-nanoparticles
#16
Jan Zaloga, Artem Feoktystov, Vasil M Garamus, Weronika Karawacka, Alexander Ioffe, Thomas Brückel, Rainer Tietze, Christoph Alexiou, Stefan Lyer
A rational use of superparamagnetic iron oxide nanoparticles (SPIONs) in drug delivery, diagnostics, and other biomedical applications requires deep understanding of the molecular drug adsorption/desorption mechanisms for proper design of new pharmaceutical formulations. The adsorption and desorption of the cytostatic Mitoxantrone (MTO) to lauric acid-albumin hybrid coated particles SPIONs (SEON(LA-HSA)) was studied by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), surface titration, release experiments and small-angle neutron and X-ray scattering...
September 28, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29035738/thrombin-activatable-fluorescent-peptide-incorporated-gold-nanoparticles-for-dual-optical-computed-tomography-thrombus-imaging
#17
Sung-Pil Kwon, Sangmin Jeon, Sung-Hoon Lee, Hong Yeol Yoon, Ju Hee Ryu, Dayil Choi, Jeong-Yeon Kim, Jiwon Kim, Jae Hyung Park, Dong-Eog Kim, Ick Chan Kwon, Kwangmeyung Kim, Cheol-Hee Ahn
Thrombosis is an important pathophysiologic phenomenon in various cardiovascular diseases, which can lead to oxygen deprivation and infarction of tissues by generation of a thrombus. Thus, direct thrombus imaging can provide beneficial in diagnosis and therapy of thrombosis. Herein, we developed thrombin-activatable fluorescent peptide (TAP) incorporated silica-coated gold nanoparticles (TAP-SiO2@AuNPs) for direct imaging of thrombus by dual near-infrared fluorescence (NIRF) and micro-computed tomography (micro-CT) imaging, wherein TAP molecules were used as targeted thrombin-activatable peptide probes for thrombin-specific NIRF imaging...
October 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/29035723/raloxifene-reduces-the-risk-of-local-alveolar-bone-destruction-in-a-mouse-model-of-periodontitis-combined-with-systemic-postmenopausal-osteoporosis
#18
Ryota Ichimaru, Tsukasa Tominari, Shosei Yoshinouchi, Chiho Matsumoto, Kenta Watanabe, Michiko Hirata, Yukihiro Numabe, Gillian Murphy, Hideaki Nagase, Chisato Miyaura, Masaki Inada
OBJECTIVE: Periodontitis is characterized by local inflammation leading to tooth loss and severe destruction of alveolar bone. Raloxifene is a selective estrogen receptor modulator (SERM) that halts estrogen deficiency-induced systemic bone loss in postmenopausal osteoporosis without the side effects of cancer in breast and uterus. In this study, we examined the effects of raloxifene on alveolar bone mass in a mouse model with estrogen deficiency-induced periodontitis. METHODS: Periodontitis was induced by the injection of lipopolysaccharide (LPS) into the lower gingiva in ovariectomized (OVX) mice, and the alveolar bone and femur bone mineral density (BMD) were analyzed by dual-energy X-ray absorptiometry...
September 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29035601/skinfold-prediction-equations-fail-to-provide-an-accurate-estimate-of-body-composition-in-elite-rugby-union-athletes-of-caucasian-and-polynesian-ethnicity
#19
Adam Zemski, Elizabeth Broad, Gary Slater
Body composition in elite rugby union athletes is routinely assessed using surface anthropometry, which can be utilised to provide estimates of absolute body composition using regression equations. This study aims to assess the ability of available skinfold equations to estimate body composition in elite rugby union athletes, who have unique physique traits and divergent ethnicity. The development of sport-specific and ethnicity-sensitive equations was also pursued. Forty-three male international Australian rugby union athletes of Caucasian and Polynesian descent underwent surface anthropometry and dual-energy X-ray absorptiometry (DEXA) assessment...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035581/gene-expression-as-a-dosimeter-in-irradiated-drosophila-melanogaster
#20
Samana Shrestha, Adam Vanasse, Leon N Cooper, Michael P Antosh
Biological indicators would be of use in radiation dosimetry in situations where an exposed person is not wearing a dosimeter, or when physical dosimeters are insufficient to estimate the risk caused by the radiation exposure. In this work, we investigate the use of gene expression as a dosimeter. Gene expression analysis was done on 15,222 genes of Drosophila melanogaster (fruit flies) at days 2, 10, and 20 postirradiation, with X-ray exposures of 10, 1000, 5000, 10,000, and 20,000 roentgens. Several genes were identified, which could serve as a biodosimeter in an irradiated D...
October 16, 2017: Journal of Computational Biology: a Journal of Computational Molecular Cell Biology
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