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https://www.readbyqxmd.com/read/29781773/a-comparison-of-total-inward-leakage-measured-using-sodium-chloride-nacl-and-corn-oil-aerosol-methods-for-air-purifying-respirators
#1
Samy Rengasamy, Ziqing Zhuang, George Niezgoda, Gary Walbert, Robert Lawrence, Brenda Boutin, Judith Hudnall, William P Monaghan, Michael Bergman, Colleen Miller, James Harris, Christopher Coffey
The International Organization for Standardization (ISO) standard 16900-1:2014 specifies the use of sodium chloride (NaCl) and corn oil aerosols, and sulfur hexafluoride gas for measuring total inward leakage (TIL). However, a comparison of TIL between different agents is lacking. The objective of this study was to measure and compare TIL for respirators using corn oil and NaCl aerosols. TIL was measured with 10 subjects donning two models of filtering facepiece respirators (FFRs) including FFP1, N95, P100, and elastomeric half-mask respirators (ERs) in NaCl and corn oil aerosol test chambers, using continuous sampling methods...
May 21, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29780961/myopic-shift-in-a-pseudophakic-eye-with-an-accommodating-iol-following-vitrectomy-with-gas-tamponade
#2
Jonathan Aker, Jessica Dowling, Lawrence Halperin
Purpose: To report the case of a patient with Crystalens, an accommodating posterior-chamber intraocular lens (IOL), who experienced a myopic shift following subsequent vitrectomy with gas tamponade. We propose a hypothesis as to why this myopic shift occurred and analyze its validity based on current literature. Observations: A patient had cataract surgery with implantation of a Crystalens AT-50AO +21D. Preoperative A-scan measured anterior chamber depth (ACD) to be 3...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29774548/release-of-tgf-%C3%AE-1-into-root-canals-with-various-final-irrigants-in-regenerative-endodontics-an-in-vitro-analysis
#3
Y Chae, M Yang, J R Kim
AIM: To investigate the release of growth factors into the root canal space after various final irrigants during regenerative endodontic procedures. The residual cytotoxic effect of final irrigants on stem cells from the apical papilla (SCAP) was also examined. METHODOLOGY: To measure the release of TGF-β1, root segments (8mm long) were irrigated with 1.5% NaOCl followed by 20 mL of final irrigants; Saline, 17% EDTA, 10% citric acid, 10% or 37% phosphoric acid...
May 17, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29774459/possible-role-of-standardized-echography-complementing-ultrasound-biomicroscopy-in-tumors-of-the-anterior-eye-segment-a-study-in-a-series-of-13-patients
#4
B Kuzmanović Elabjer, M Bušić, D Miletić, M Bjeloš, N Vukojević, D Bosnar
PURPOSE: To evaluate the efficacy of standardized A-scan echography (ASE) complementing ultrasound biomicroscopy (UBM) to propose the most efficient method as grounds for the diagnosis, treatment, and follow-up of anterior eye-segment tumors. METHODS: The inclusion criteria were tumors of the ciliary body and peripheral choroidal tumors, whose anterior border could not be visualized with a 10 MHz ultrasound probe. The largest basal dimension and the highest prominence of the tumor were measured with a UBM Lin 50 probe...
May 17, 2018: Journal of Ultrasound
https://www.readbyqxmd.com/read/29773881/evaluation-of-vascular-changes-with-optical-coherence-tomography-angiography-after-ruthenium-106-brachytherapy-of-circumscribed-choroidal-hemangioma
#5
Gilda Cennamo, Claudia Rossi, Maria Angelica Breve, Nunzio Velotti, Antonio Farella, Raffaele Liuzzi, Giovanni Cennamo
PURPOSE: To describe the vascular changes of circumscribed choroidal hemangioma (CCH) after ruthenium-106 brachytherapy using optical coherence tomography angiography (angio-OCT). METHODS: Seven eyes of 7 patients diagnosed with symptomatic CCH who underwent ruthenium-106 plaque radiotherapy were included in the study. Patients underwent complete ophthalmic examination, bulbar echography and angio-OCT. The same protocol was applied 1 year after ruthenium-106 brachytherapy...
May 18, 2018: Eye
https://www.readbyqxmd.com/read/29772663/electrochemical-and-electronic-charge-transport-properties-of-ni-doped-limn%C3%A2-o%C3%A2-spinel-obtained-from-polyol-mediated-synthesis
#6
Shuo Yang, Dirk Oliver Schmidt, Abhishek Khetan, Felix Schrader, Simon Jakobi, Melanie Homberger, Michael Noyong, Anja Paulus, Hans Kungl, Rüdiger-Albert Eichel, Heinz Pitsch, Ulrich Simon
LiNi0.5 Mn1.5 O₄ (LNMO) spinel has been extensively investigated as one of the most promising high-voltage cathode candidates for lithium-ion batteries. The electrochemical performance of LNMO, especially its rate performance, seems to be governed by its crystallographic structure, which is strongly influenced by the preparation methods. Conventionally, LNMO materials are prepared via solid-state reactions, which typically lead to microscaled particles with only limited control over the particle size and morphology...
May 16, 2018: Materials
https://www.readbyqxmd.com/read/29770687/spatial-associations-and-chemical-composition-of-organic-carbon-sequestered-in-fe-ca-and-organic-carbon-ternary-systems
#7
Tyler Sowers, Dinesh Adhikari, Jian Wang, Yu Yang, Donald L Sparks
Organo-mineral associations of organic carbon (OC) with iron (Fe) oxides play a major role in environmental OC sequestration, a process crucial to mitigating climate change. Calcium has been found to have high co-association with OC in soils containing high Fe content, increase OC sorption extent to poorly-crystalline Fe oxides, and has long been suspected to form bridging complexes with Fe and OC. Due to the growing realization that Ca may be an important component of C cycling, we launched a scanning transmission X-ray microscopy (STXM) investigation, paired with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, in order to spatially resolve Fe, Ca, and OC relationships and probe the effect of Ca on sorbed OC speciation...
May 17, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29768730/biofilm-in-voice-prosthesis-a-prospective-cohort-study-and-laboratory-tests-using-sonication-and-sem-analysis
#8
Jacopo Galli, Lea Calo', Duino Meucci, Monica Giuliani, Daniela Lucidi, Gaetano Paludetti, Riccardo Torelli, Maurizio Sanguinetti, Claudio Parrilla
OBJECTIVE: The objective of the study was to compare the biofilm growing pattern and its morphological extent on silicone and a teflon-like material using a sonication process and a Scanning Electron Microscope (SEM). DESIGN: A prospective cohort study and a laboratory study. SETTING: Otolaryngology -Head and Neck surgery Department and the Microbiology Institute. PARTICIPANTS: The participants included fifteen laryngectomized patients with phonatory prostheses, which were removed due to device failure, and two different kinds of phonatory prostheses from the laboratory (Provox 2 and ActiValve) that were artificially colonized by Candida albicans...
May 16, 2018: Clinical Otolaryngology
https://www.readbyqxmd.com/read/29767632/reply-to-comment-on-invasive-and-noninvasive-means-of-measuring-intracranial-pressure-a-review
#9
Xuan Zhang, Joshua E Medow, Bermans J Iskandar, Fa Wang, Mehdi Shokoueinejad, Joyce Koueik, John G Webster
In their comments, Drs. De Bernardo and Rosa stated that our paper was missing several references
 related to optic nerve sheath diameter ONSD assessments. Specifically, they state that we neglected to
 mention that ultrasound has been used since the 1970s, that we did not emphasize the role of
 Standardized A scans, and they reference some of their publications in which they emphasize the
 importance of these scans in diagnosing optic nerve lesions and benign intracranial hypertension...
May 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29767244/propranolol-induces-hemangioma-endothelial-cell-apoptosis-via-a-p53%C3%A2-bax-mediated-pathway
#10
Tian-Hua Yao, Parekejiang Pataer, Krishna Prasad Regmi, Xi-Wen Gu, Quan-Yan Li, Jing-Ting Du, Su-Meng Ge, Jun-Bo Tu
The use of propranolol for the treatment of infantile hemangioma (IH) has been widely investigated in recent years. However, the underlying therapeutic mechanism of propranolol for the treatment of IH remains poorly understood. The aim of the present study was to investigate the expression of proteins regulated by cellular tumor antigen p53 (p53) in associated apoptosis pathways in IH endothelial cells (HemECs) treated with propranolol. Furthermore, the present study aimed to investigate the exact apoptotic pathway underlying the therapeutic effect of propranolol against IH...
May 14, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29765323/up-down-reader-an-open-source-program-for-efficiently-processing-50-von-frey-thresholds
#11
Rafael Gonzalez-Cano, Bruno Boivin, Daniel Bullock, Laura Cornelissen, Nick Andrews, Michael Costigan
Most pathological pain conditions in patients and rodent pain models result in marked alterations in mechanosensation and the gold standard way to measure this is by use of von Frey fibers. These graded monofilaments are used to gauge the level of stimulus-evoked sensitivity present in the affected dermal region. One of the most popular methods used to determine von Frey thresholds is the up-down testing paradigm introduced by Dixon for patients in 1980 and by Chapman and colleagues for rodents in 1994. Although the up-down method is very accurate, leading to its widespread use, defining the 50% threshold from primary data is complex and requires a relatively time-consuming analysis step...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29763495/early-response-of-fibroblasts-and-epithelial-cells-to-pink-shaded-anodized-dental-implant-abutments-an-in-vitro-study
#12
Federico Mussano, Tullio Genova, Marco Laurenti, Elisa Zicola, Luca Munaron, Paola Rivolo, Pietro Mandracci, Stefano Carossa
PURPOSE: This research aimed to assess whether pink-shaded anodized surfaces could enhance the adhesion of soft tissue cells compared with untreated machined titanium surfaces. MATERIALS AND METHODS: Two types of Ti-Al-V titanium samples were prepared: machined titanium (Ti) and anodized titanium (AnoTi). The microstructure was studied by means of a scanning electron microscope. X-ray photoelectron spectroscopy (XPS) was carried out as well. The wetting properties were investigated by the sessile drop technique with water and diiodomethane...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29760358/a-reliable-grading-system-for-prediction-of-hematoma-expansion-in-intracerebral-hemorrhage-in-the-basal-ganglia
#13
Yongwei Huang, Qiang Zhang, Mingfei Yang
Hematoma expansion (HE) is an independent predictor of poor outcome and secondary neurological deterioration in intracerebral hemorrhage (ICH) and is associated with high morbidity and mortality. Noncontrast computed tomography (NCCT) may identify the sites of active extravasation. Therefore, we have attempted to (1) devise a reliable and easy-to-use prediction score to predict the risk of HE in ICH and (2) validate the accuracy of this grading system and perform an independent analysis of HE predictors. We included patients in whom an intracerebral hemorrhage (ICH) occurred in the basal ganglia between Jan...
2018: Bioscience Trends
https://www.readbyqxmd.com/read/29756947/influence-of-magnetic-ordering-between-cr-adatoms-on-the-yu-shiba-rusinov-states-of-the-%C3%AE-bi_-2-pd-superconductor
#14
Deung-Jang Choi, Carlos García Fernández, Edwin Herrera, Carmen Rubio-Verdú, Miguel M Ugeda, Isabel Guillamón, Hermann Suderow, José Ignacio Pascual, Nicolás Lorente
We show that the magnetic ordering of coupled atomic dimers on a superconductor is revealed by their intragap spectral features. Chromium atoms on the superconductor β-Bi_{2}Pd surface display Yu-Shiba-Rusinov bound states, detected as pairs of intragap excitations in tunneling spectra. By means of atomic manipulation with a scanning tunneling microscope's tip, we form Cr dimers with different arrangements and find that their intragap features appear either shifted or split with respect to single atoms. These spectral variations are associated with the magnetic coupling, ferromagnetic or antiferromagnetic, of the dimer, as confirmed by density functional theory simulations...
April 20, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29756511/surface-integrity-of-polyethylene-liners-following-trunnionosis-of-a-dual-modular-neck-total-hip-implant
#15
Ben Gi Spiegelberg, Brent A Lanting, James L Howard, Matthew G Teeter, Douglas Dr Naudie
BACKGROUND: There has been a trend in the evolution of total hip arthroplasty towards increased modularity; with this increase in modularity come some potentially harmful consequences. Modularity at the neck shaft junction has been linked to corrosion, adverse reaction to metal debris and pseudotumour formation. AIM: The aim of this retrieval study is to assess whether the surface integrity of the polyethylene (PE) liner is affected by metal wear debris in a single implant design series of THA revised for trunnionosis...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29754916/accuracy-of-device-landing-zone-calcium-volume-measurement-with-contrast-enhanced-multidetector-computed-tomography
#16
Won-Keun Kim, Matthias Renker, Andreas Rolf, Christoph Liebetrau, Arnaud Van Linden, Mani Arsalan, Mirko Doss, Julian Rieck, Maksymilian P Opolski, Helge Möllmann, Thomas Walther, Christian W Hamm
BACKGROUND: The extent of aortic valve calcification is an important determinant of procedural success in transcatheter aortic valve implantation (TAVI). We sought to validate device landing zone calcium volume (DLZ-CV) measurements on contrast-enhanced multidetector computed tomography (MDCT) with non-contrast-enhanced scans as reference. METHODS: We determined DLZ-CV in 141 patients undergoing transfemoral TAVI. Non-contrast-enhanced images were analyzed using a threshold of 130 HU as reference (DLZ-CV130 )...
July 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29753176/in-situ-mechanical-test-of-dragonfly-wing-veins-and-their-crack-arrest-behavior
#17
Zhihui Zhang, Lan Zhang, Zhenglei Yu, Jingjing Liu, Xiujuan Li, Yunhong Liang
In natural biological systems, many insects in complex environments exhibit exemplary mechanical properties. Dragonfly wings are light and strong enough to withstand wind loading. Their rigid veins play supporting and strengthening roles to enhance resistance to fatigue. To explore the effect of veins on arresting cracking in the wing, the costa, subcosta, radius R1, and two areas of dragonfly hind wings were samples for in situ tensile tests. The fracture process of the samples was observed with a high-speed camera and a scanning electron microscope...
May 5, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29752162/synthesis-and-characterization-of-a-new-methacrylate-monomer-derived-from-the-cashew-nut-shell-liquid-cnsl-and-its-effect-on-dentinal-tubular-occlusion
#18
Madiana Magalhães Moreira, Lucas Renan Rocha da Silva, Talita Arrais Daniel Mendes, Sérgio Lima Santiago, Selma Elaine Mazzetto, Diego Lomonaco, Victor Pinheiro Feitosa
OBJECTIVE: The aim of this study was to synthesize, to characterize and to evaluate the effects on tubular occlusion of new monomer derived from cashew nut shell liquid (CNSL), also studying the effects of acid challenge (AC) on dentin surfaces treated with desensitizers. METHODS: The intermediary cardanol-epoxy (CNE) was synthesized through epoxidation of CNSL, followed by synthesis of cardanol-methacrylate-epoxy (CNME) through methacryloyl chloride esterification...
May 8, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29739202/bias-induced-conformational-switching-of-supramolecular-networks-of-trimesic-acid-at-the-solid-liquid-interface
#19
J Ubink, M Enache, M Stöhr
Using the tip of a scanning tunneling microscope, an electric field-induced reversible phase transition between two planar porous structures ("chickenwire" and "flower") of trimesic acid was accomplished at the nonanoic acid/highly oriented pyrolytic graphite interface. The chickenwire structure was exclusively observed for negative sample bias, while for positive sample bias only the more densely packed flower structure was found. We suggest that the slightly negatively charged carboxyl groups of the trimesic acid molecule are the determining factor for this observation: their adsorption behavior varies with the sample bias and is thus responsible for the switching behavior...
May 7, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29738513/extrinsic-calibration-of-a-laser-galvanometric-setup-and-a-range-camera
#20
Seppe Sels, Boris Bogaerts, Steve Vanlanduit, Rudi Penne
Currently, galvanometric scanning systems (like the one used in a scanning laser Doppler vibrometer) rely on a planar calibration procedure between a two-dimensional (2D) camera and the laser galvanometric scanning system to automatically aim a laser beam at a particular point on an object. In the case of nonplanar or moving objects, this calibration is not sufficiently accurate anymore. In this work, a three-dimensional (3D) calibration procedure that uses a 3D range sensor is proposed. The 3D calibration is valid for all types of objects and retains its accuracy when objects are moved between subsequent measurement campaigns...
May 8, 2018: Sensors
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