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https://www.readbyqxmd.com/read/28930430/novel-strategies-for-the-production-of-fuels-lubricants-and-chemicals-from-biomass
#1
Sankaranarayanapillai Shylesh, Amit A Gokhale, Christopher R Ho, Alexis T Bell
Growing concern with the environmental impact of CO2 emissions produced by combustion of fuels derived from fossil-based carbon resources has stimulated the search for renewable sources of carbon. Much of this focus has been on the development of methods for producing transportation fuels, the major source of CO2 emissions today, and to a lesser extent on the production of lubricants and chemicals. First-generation biofuels such as bioethanol, produced by the fermentation of sugar cane- or corn-based sugars, and biodiesel, produced by the transesterification reaction of triglycerides with alcohols to form a mixture of long-chain fatty esters, can be blended with traditional fuels in limited amounts and also arise in food versus fuel debates...
September 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28929419/high-resolution-mr-imaging-for-dental-impressions-a-feasibility-study
#2
Julian Boldt, Kurt Rottner, Marc Schmitter, Andreas Hopfgartner, Peter Jakob, Ernst-Jürgen Richter, Olga Tymofiyeva
OBJECTIVES: Magnetic resonance imaging is an emerging technology in dental medicine. While low-resolution MRI has especially provided means to examine the temporomandibular joint due to its anatomic inaccessibility, it was the goal of this study to assess whether high-resolution MRI is capable of delivering a dataset sufficiently precise enough to serve as digital impression of human teeth. MATERIALS AND METHODS: An informed and consenting patient in need of dental restoration with fixed partial dentures was chosen as subject...
September 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28929263/melt-extrusion-of-high-dose-co-amorphous-drug-drug-combinations
#3
Lærke Arnfast, Md Kamruzzaman, Korbinian Löbmann, Johanna Aho, Stefania Baldursdottir, Thomas Rades, Jukka Rantanen
PURPOSE: Many future drug products will be based on innovative manufacturing solutions, which will increase the need for a thorough understanding of the interplay between drug material properties and processability. In this study, hot melt extrusion of a drug-drug mixture with minimal amount of polymeric excipient was investigated. METHODS: Using indomethacin-cimetidine as a model drug-drug system, processability of physical mixtures with and without 5% (w/w) of polyethylene oxide (PEO) were studied using Differential Scanning Calorimetry (DSC) and Small Amplitude Oscillatory Shear (SAOS) rheometry...
September 19, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28929117/histological-evidence-of-the-osseointegration-of-fractured-direct-metal-laser-sintering-implants-retrieved-after-5-years-of-function
#4
Francesco Mangano, Carlo Mangano, Adriano Piattelli, Giovanna Iezzi
BACKGROUND: Direct metal laser sintering (DMLS) is an additive manufacturing technique that allows the fabrication of dental implants layer by layer through the laser fusion of titanium microparticles. The surface of DMLS implants is characterized by a high open porosity with interconnected pores of different sizes; therefore, it has the potential to enhance and accelerate bone healing. To date, however, there are no histologic/histomorphometric studies in the literature evaluating the interface between bone and DMLS implants in the long-term...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28928477/a-generic-method-to-synthesise-graphitic-carbon-coated-nanoparticles-in-large-scale-and-their-derivative-polymer-nanocomposites
#5
Nannan Wang, Zhuxian Yang, Fang Xu, Kunyapat Thummavichai, Hongmei Chen, Yongde Xia, Yanqiu Zhu
A versatile Rotary Chemical Vapour Deposition (RCVD) technique for the in-situ synthesis of large scale carbon-coated non-magnetic metal oxide nanoparticles (NPs) is presented, and a controllable coating thickness varying between 1-5 nm has been achieved. The technique has significantly up-scaled the traditional chemical vapour deposition (CVD) production for NPs from mg level to 10 s of grams per batch, with the potential for continuous manufacturing. The resulting smooth and uniform C-coatings sheathing the inner core metal oxide NPs are made of well-crystallised graphitic layers, as confirmed by electron microscopy imaging, electron dispersive spectrum elemental line scan, X-ray powder diffractions and Raman spectroscopy...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927954/systematic-three-dimensional-analysis-of-wafer-based-maxillary-repositioning-procedures-in-orthognathic-surgery
#6
Timo Dreiseidler, Max-Philipp Lentzen, Matthias Zirk, Ali-Farid Safi, Joachim E Zoeller, Matthias Kreppel
PURPOSE: Little is known about the three-dimensional (3D) transfer accuracy in maxillary repositioning procedures based on conventionally manufactured dental-mounted wafers. The purpose of the present study was a systematic 3D analysis for wafer-based maxillary positioning in orthognathic surgery. MATERIALS AND METHODS: A total of 92 patients underwent Le Fort I in addition to mandibular bilateral sagittal split osteotomies (BSSO). Alignment of the pre- and postsurgical CBCT data sets allowed measuring maxillary position changes in axial, sagittal and transversal directions...
August 31, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28927929/mechanical-characterization-of-structurally-porous-biomaterials-built-via-additive-manufacturing-experiments-predictive-models-and-design-maps-for-load-bearing-bone-replacement-implants
#7
D Melancon, Z S Bagheri, R B Johnston, L Liu, M Tanzer, D Pasini
Porous biomaterials can be additively manufactured with micro-architecture tailored to satisfy the stringent mechano-biological requirements imposed by bone replacement implants. In a previous investigation, we introduced structurally porous biomaterials, featuring strength five times stronger than commercially available porous materials, and confirmed their bone ingrowth capability in an in-vivo canine model. While encouraging, the manufactured biomaterials showed geometric mismatches between their internal porous architecture and that of its as-designed counterpart, as well as discrepancies between predicted and tested mechanical properties, issues not fully elucidated...
September 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28927607/synthesis-and-characterization-of-grafting-polystyrene-from-guar-gum-using-atom-transfer-radical-addition
#8
Yang Yang, Fu Chen, Qi Chen, Jie He, Tao Bu, Xuemei He
To broaden the application fields for guar gum, this natural polymer is often grafted to/from the surface to modify its properties. Polystyrene-guar gum (PS-guar gum) is successfully synthesized using atom transfer radical addition based n-BuBr(C4H9Br), Cu(I)Cl and N,N,N',N″,N‴-penthamethyldiethylenetriamine (C9H23N3,PMDETA) as initiator, electronating agent and ligand respectively in an inert atmosphere. The graft copolymer is characterized by FT-IR, (1)H NMR, XRD and scanning electron microscope (SEM)...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28926342/recent-trends-in-the-industrial-use-and-emission-of-known-and-suspected-carcinogens-in-ontario-canada
#9
Catherine E Slavik, Sheila Kalenge, Paul A Demers
BACKGROUND: In 2010, Ontario, Canada's most populous province, implemented its Toxics Reduction Act, Ontario Regulation 455/09 (TRA), which requires four major manufacturing and mineral processing industry groups that already report releases of pollutants federally to the National Pollutant Release Inventory to additionally track, account and report their use and creation. The TRA was modeled after the Massachusetts Toxics Use Reduction Act of 1989, which has been very successful and reported significant reduction in toxic use and carcinogen release...
September 19, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28924730/effects-of-the-preparation-process-on-the-properties-of-amorphous-solid-dispersions
#10
Siyuan Huang, Robert O Williams
The use of amorphous solid dispersions to improve the bioavailability of active ingredients from the BCS II and IV classifications continues to gain interest in the pharmaceutical industry. Over the last decade, methods for generating amorphous solid dispersions have been well established in commercially available products and in the literature. However, the amorphous solid dispersions manufactured by different technologies differ in many aspects, primarily chemical stability, physical stability, and performance, both in vitro and in vivo...
September 18, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28924491/sstr4-childhood-adversity-self-efficacy-and-suicide-risk-in-alcoholics
#11
Dominika Berent, Gerard Emilien, Michał Podgórski, Ewa Kusideł, Dominika Kulczycka-Wojdala, Bożena Szymańska, Marian Macander, Zofia Pawłowska
BACKGROUND: Patients with alcohol dependence (AD) are known to develop poor social skills, to report a higher number of adverse childhood experiences (ACEs) and to attempt suicide more frequently than the general population. The background for the association between ACEs and a higher risk of suicide still remains understudied. SSTR4 rs2567608 is a functional polymorphism of the gene for somatostatin receptor subtype 4, predominantly found in the CA1 hippocampus area and involved in memory formation...
2017: Translational Neuroscience
https://www.readbyqxmd.com/read/28923243/sensitivity-and-specificity-of-two-different-automated-external-defibrillators
#12
Johan Israelsson, Burkard von Wangenheim, Kristofer Årestedt, Birgitta Semark, Kristina Schildmeijer, Jörg Carlsson
AIM: The aim was to investigate the clinical performance of two different types of automated external defibrillators (AEDs). METHODS: Three investigators reviewed 2938 rhythm analyses performed by AEDs in 240 consecutive patients (median age 72, q1-q3=62-83) who had suffered cardiac arrest between January 2011 and March 2015. Two different AEDs were used (AED A n=105, AED B n=135) in-hospital (n=91) and out-of-hospital (n=149). RESULTS: Among 194 shockable rhythms, 17 (8...
September 15, 2017: Resuscitation
https://www.readbyqxmd.com/read/28922664/patchy-particles-made-by-colloidal-fusion
#13
Zhe Gong, Theodore Hueckel, Gi-Ra Yi, Stefano Sacanna
Patches on the surfaces of colloidal particles provide directional information that enables the self-assembly of the particles into higher-order structures. Although computational tools can make quantitative predictions and can generate design rules that link the patch motif of a particle to its internal microstructure and to the emergent properties of the self-assembled materials, the experimental realization of model systems of particles with surface patches (or 'patchy' particles) remains a challenge. Synthetic patchy colloidal particles are often poor geometric approximations of the digital building blocks used in simulations and can only rarely be manufactured in sufficiently high yields to be routinely used as experimental model systems...
September 18, 2017: Nature
https://www.readbyqxmd.com/read/28922640/a-novel-spectroscopic-analysis-to-detect-photochemical-reaction-of-the-bronchodilator-doxofylline-and-its-estimation-in-pharmaceutical-formulation
#14
P Sasi Rekha, S Gunasekaran
Photostability studies of drugs and drug products are an integral part of the product development process in the pharmaceutical industry. These studies are carried out to ensure quality, efficacy and safety of the formulated products during manufacture, storage and use. In this investigation, a novel spectroscopic approach has been adopted by employing the FTIR-ATR and UV/Visible techniques to detect the photochemical reactions of the drug Doxofylline, chemically designated as 7-(1, 3 dioxolane-2-yl methyl) theophylline, in its raw (pure) form...
September 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28920439/multi-material-3d-printing-of-graphene-based-electrodes-for-electrochemical-energy-storage-using-thermo-responsive-inks
#15
Victoria García Rocha, Esther Garcia-Tunon, Cristina Botas, Foivos Markoulidis, Ezra Feilden, Eleonora D'Elia, Na Ni, Milo Sebastian Peter Shaffer, Eduardo Saiz
The current lifestyles, increasing population and limited resources result in energy research being at the forefront of worldwide grand challenges, increasing the demand for sustainable and more efficient energy devices. In this context, Additive Manufacturing brings the possibility of making electrodes and electrical energy storage (EES) devices in any desired 3D shape and dimensions, while preserving the multifunctional properties of the active materials in terms of surface area and conductivity. This paves the way to optimized and more efficient designs for energy devices...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28919925/in-vitro-evaluation-of-polylactic-acid-pla-manufactured-by-fused-deposition-modeling
#16
Matthias C Wurm, Tobias Möst, Bastian Bergauer, Dominik Rietzel, Friedrich Wilhelm Neukam, Sandra C Cifuentes, Cornelius von Wilmowsky
BACKGROUND: With additive manufacturing (AM) individual and biocompatible implants can be generated by using suitable materials. The aim of this study was to investigate the biological effects of polylactic acid (PLA) manufactured by Fused Deposition Modeling (FDM) on osteoblasts in vitro according to European Norm / International Organization for Standardization 10,993-5. METHOD: Human osteoblasts (hFOB 1.19) were seeded onto PLA samples produced by FDM and investigated for cell viability by fluorescence staining after 24 h...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28919333/status-of-the-effectiveness-of-contact-lens-disinfectants-in-malaysia-against-keratitis-causing-pathogens
#17
Farhat Abjani, Naveed Ahmed Khan, Suk Yul Jung, Ruqaiyyah Siddiqui
The aim of this study was (i) to assess the antimicrobial effects of contact lens disinfecting solutions marketed in Malaysia against common bacterial eye pathogens and as well as eye parasite, Acanthamoeba castellanii, and (ii) to determine whether targeting cyst wall would improve the efficacy of contact lens disinfectants. Using ISO 14729 Stand-Alone Test for disinfecting solutions, bactericidal and amoebicidal assays of six different contact lens solutions including Oxysept(®), AO SEPT PLUS, OPTI-FREE(®) pure moist(®), Renu(®) fresh™, FreshKon(®) CLEAR and COMPLETE RevitaLens™ were performed using Manufacturers Minimum recommended disinfection time (MRDT)...
September 14, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28918325/a-novel-lc-ms-ms-method-for-the-quantitative-measurement-of-the-acetate-content-in-pharmaceutical-peptides
#18
Rani J Qasem, Ibrahim K Farh, Mohammed A Al Essa
Most pharmaceutical peptides are supplied as acetate salts and the relative amount of acetate to peptide in the final product is one quality criterion required by regulatory agencies to approve the product for clinical use. The objective of the present study was to develop a validated LC-MS/MS method that allows the quantitative determination of the acetate content in pharmaceutical peptide preparations and simultaneous monitoring and collection of qualitative and quantitative information on the peptide during manufacture and in the final product...
September 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28916562/impact-of-coil-price-knowledge-by-the-operator-on-the-cost-of-aneurysm-coiling-a-single-center-study
#19
Stephanos Finitsis, Robert Fahed, Ian Gaulin, Daniel Roy, Alain Weill
BACKGROUND: Endovascular treatment of aneurysms with coils is among the most frequent treatments in interventional neuroradiology, and represents an important expense. Each manufacturer has created several types of coils, with prices varying among brands and coil types. The objective of this study was to assess the impact of cost awareness of the exact price of each coil by the operating physician on the total cost of aneurysm coiling. MATERIALS AND METHODS: This was a comparative study conducted over 1 year in a single tertiary care center...
September 15, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28916301/enhancing-monoterpene-alcohols-in-sweet-potato-shochu-using-the-diglycoside-specific-%C3%AE-primeverosidase
#20
Yuichiro Sato, Jinshun Han, Hisashi Fukuda, Shigeaki Mikami
Monoterpene alcohols (MTAs) are characteristic flavour-imparting compounds in sweet potato shochu (Japanese distilled spirit) that are liberated following hydrolysis by specific enzymes during fermentation. In the present study, we evaluated the effect of an exogenously added diglycoside-specific β-glycosidase (β-primeverosidase) on aroma formation during shochu brewing using various sweet potato species to address whether MTAs are predominantly present as diglycosidic precursors in raw materials. The results showed that the amount of MTAs produced from enzyme-treated mash was dramatically increased by 2- to 9-fold compared with untreated controls, and the increase varied with sweet potato species...
September 12, 2017: Journal of Bioscience and Bioengineering
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