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https://www.readbyqxmd.com/read/29775904/biosynthesis-of-chiral-epichlorohydrin-using-an-immobilized-halohydrin-dehalogenase-in-aqueous-and-non-aqueous-phase
#1
Xiao-Jian Zhang, Ping-Xiu Shi, Han-Zhong Deng, Xin-Xin Wang, Zhi-Qiang Liu, Yu-Guo Zheng
Asymmetric synthesis of chiral epichlorohydrin (ECH) from 1,3-dichloro-2-propanol (1,3-DCP) using halohydrin dehalogenase (HHDH) is of great value due to the 100% theoretical yield and high enantioselectivity. In this study, HheC (P175S/W249P) was immobilized on an A502Ps resin and used for the preparation of (S)-ECH. In aqueous system, the immobilized HheC catalyzed the biosynthesis of (S)-ECH with 83.78% yield and 92.53% enantiomeric excess (ee) at 1,3-DCP concentration of 20 mM. The non-aqueous system was further developed using water saturated ethyl acetate as solvent and reaction phase...
May 8, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29775883/hydrolysis-and-recycling-of-urea-formaldehyde-resin-residues
#2
Ming Liu, Yan Wang, Yiqiang Wu, Hui Wan
Urea formaldehyde (UF) resin residues generate many poisonous chemicals during traditional disposal technologies for organic hazardous wastes. In this study, hydrothermal hydrolysis was developed to decompose, remove, and recycle cured UF resin. Under 140 °C and 2 h of hydrothermal process, 20 mL of either 2 M HCl or 30 w.t. % of formaldehyde solutions can decompose as much as 1.7 g of cured UF resin. In addition, from the attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR), gas chromatography-mass spectroscopy (GCMS), X-ray diffraction (XRD), and 1 H nuclear magnetic resonance (NMR) analyses, it confirmed that the hydrothermal hydrolysis could hydrolyze cured UF resin...
May 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775637/modified-resin-infiltration-of-non-micro-and-cavitated-proximal-caries-lesions-in-vitro
#3
H Askar, F Schwendicke, J Lausch, H Meyer-Lueckel, S Paris
OBJECTIVE: Infiltrant resin (IR) is currently indicated for non-cavitated caries lesions. However, modifying the technique might expand its indication spectrum to micro-cavitated lesions. The present study aimed to evaluate the penetration/filling ability of a newly developed micro-filled infiltrant resin (MFIR) in non-, micro- and cavitated natural caries lesions. MATERIALS AND METHODS: Proximal lesions in 120 extracted human teeth with ICDAS-2 (n = 30), 3 (n = 45) and 5 (n = 45) lesions were etched with 15% hydrochloric acid gel for 2 min and allocated to one of the following treatments; IR: lesions (ICDAS-2, 3 and 5; each n = 15) were treated with commercial infiltrant resin for 3 min...
May 15, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29775481/widespread-anatoxin-a-detection-in-benthic-cyanobacterial-mats-throughout-a-river-network
#4
Keith Bouma-Gregson, Raphael M Kudela, Mary E Power
Benthic algae fuel summer food webs in many sunlit rivers, and are hotspots for primary and secondary production and biogeochemical cycling. Concerningly, riverine benthic algal assemblages can become dominated by toxic cyanobacteria, threatening water quality and public health. In the Eel River in Northern California, over a dozen dog deaths have been attributed to cyanotoxin poisonings since 2000. During the summers of 2013-2015, we documented spatial and temporal patterns of cyanotoxin concentrations in the watershed, showing widespread distribution of anatoxin-a in benthic cyanobacterial mats...
2018: PloS One
https://www.readbyqxmd.com/read/29775208/biodegradation-of-asphaltene-and-petroleum-compounds-by-a-highly-potent-daedaleopsis-sp
#5
Elaheh Pourfakhraei, Jalil Badraghi, Fatemeh Mamashli, Mahboobeh Nazari, Ali Akbar Saboury
Petroleum, as the major energy source, is indispensable from our lives. Presence of compounds resistant to degradation can pose risks for human health and environment. Basidiomycetes have been considered as powerful candidates in biodegradation of petroleum compounds via secreting ligninolytic enzymes. In this study a wood-decaying fungus was isolated by significant degradation ability that was identified as Daedaleopsis sp. by morphological and molecular identification methods. According to GC/MS studies, incubation of heavy crude oil with Daedaleopsis sp...
May 18, 2018: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/29775058/multiple-click-selective-trna-synthetases-expand-mammalian-cell-specific-proteomics
#6
Andrew C Yang, Haley du Bois, Niclas Olsson, David Gate, Benoit Lehallier, Daniela Berdnik, Kyle D Brewer, Carolyn R Bertozzi, Joshua E Elias, Tony Wyss-Coray
Bio-orthogonal tools enable cell-type-specific proteomics, a prerequisite to understanding biological processes in multicellular organisms. Here we report two engineered aminoacyl-tRNA synthetases for mammalian bio-orthogonal labeling: a tyrosyl ( ScTyrY34G ) and a phenylalanyl ( MmPheT412G ) tRNA synthetase that incorporate azide-bearing noncanonical amino acids specifically into the nascent proteomes of host cells. Azide-labeled proteins are chemoselectively tagged via azide-alkyne cycloadditions with fluorophores for imaging or affinity resins for mass spectrometric characterization...
May 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29774768/the-effects-of-boswellia-serrata-gum-resin-on-the-blood-glucose-and-lipid-profile-of-diabetic-patients-a-double-blind-randomized-placebo-controlled-clinical-trial
#7
Saeed Mehrzadi, Bahreh Tavakolifar, Hasan Fallah Huseini, Seyed Hamdollah Mosavat, Mojtaba Heydari
Regarding preclinical evidence for antidiabetic effects of Boswellia serrata, we evaluated antihyperglycemic and lipid-lowering effects of Boswellia serrata gum resin in type 2 diabetic patients. Fifty-six diabetic patients were randomly allocated to 2 groups to receive 250 mg of the Boswellia serrata gum resin or placebo twice daily for 8 weeks in addition to their routine antidiabetic treatments. Although there was a considerable reduction after the intervention in the field of fasting blood sugar, glycosylated hemoglobin, and triglyceride in the Boswellia serrata gum resin group, no significant difference was observed in all outcome measures between the 2 groups at the end of the study...
January 2018: Journal of evidence-based integrative medicine
https://www.readbyqxmd.com/read/29773340/acid-monomer-analysis-in-waterborne-polymer-systems-by-targeted-labeling-of-carboxylic-acid-functionality-followed-by-pyrolysis-gas-chromatography
#8
T Brooijmans, R Okhuijsen, I Oerlemans, P J Schoenmakers, R Peters
Pyrolysis - gas chromatography - (PyGC) is a common method to analyse the composition of natural and synthetic resins. The analysis of acid functionality in, for example, waterborne polyacrylates and polyurethanes polymers has proven to be difficult due to solubility issues, inter- and intramolecular interaction effects, lack of detectability in chromatographic analysis, and lack of thermal stability. Conventional analytical techniques, such as PyGC, cannot be used for the direct detection and identification of acidic monomers, due to thermal rearrangements that take place during pyrolysis...
May 14, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29773237/application-of-a-resin-handle-for-preparation-of-lamina-for-osteo-odontokeratoprosthesis
#9
A Enomoto, K Matsunaga, M Fukuda, Y Shimomura, S Hamada
No abstract text is available yet for this article.
May 14, 2018: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/29772034/three-dimensional-analysis-of-internal-adaptations-of-crowns-cast-from-resin-patterns-fabricated-using-computer-aided-design-computer-assisted-manufacturing-technologies
#10
Yushu Liu, Hongqiang Ye, Yong Wang, Yijao Zhao, Yuchun Sun, Yongsheng Zhou
PURPOSE: To evaluate the internal adaptations of cast crowns made from resin patterns produced using three different computer-aided design/computer-assisted manufacturing technologies. MATERIALS AND METHODS: A full-crown abutment made of zirconia was digitized using an intraoral scanner, and the design of the crown was finished on the digital model. Resin patterns were fabricated using a fused deposition modeling (FDM) 3D printer (LT group), a digital light projection (DLP) 3D printer (EV group), or a five-axis milling machine (ZT group)...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29772033/passivity-of-fit-of-a-novel-prefabricated-implant-supported-mandibular-full-arch-reconstruction-a-comparative-in-vitro-study
#11
Matthias Karl, Roberto Carretta, Kenji W Higuchi
PURPOSE: To quantify the strain development of a new prefabricated implant-supported mandibular full-arch reconstruction. MATERIALS AND METHODS: Five resin models reflecting edentulous mandibles were each restored with three interforaminal implants and prefabricated frameworks with a novel compensation mechanism, cast frameworks, and computer-aided design/computer-assisted manufacturing (CAD/CAM)-fabricated frameworks. Strains were recorded during superstructure fixation...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29771119/engineering-hollow-carbon-architecture-for-high-performance-k-ion-battery-anode
#12
De-Shan Bin, Xi-Jie Lin, Yong-Gang Sun, Yan-Song Xu, Ke Zhang, An-Min Cao, Lijun Wan
K-ion batteries (KIBs) are now drawing increasing research interest as an inexpensive alternative to Li-ion batteries (LIBs). However, due to the large size of K+, stable electrode materials capable of sustaining the repeated K+ in-tercalation/deintercalation cycles are extremely deficient especially if a satisfactory reversible capacity is expected. Herein, we demonstrated that the structural engineering of carbon into a hollow interconnected architecture, a shape similar to the neuron-cell network, promised high conceptual and technological potential for a high-performance KIBs anode...
May 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29770982/characterisation-of-phenolic-compounds-by-uplc-qtof-ms-ms-of-geopropolis-from-the-stingless-bee-melipona-subnitida-janda%C3%A3-ra
#13
Silvana Alves de Souza, Telma Maria Guedes da Silva, Eva Monica Sarmento da Silva, Celso Amorim Camara, Tania Maria Sarmento Silva
INTRODUCTION: Melipona subnitida Ducke (jandaíra) is a stingless bee native to north-eastern Brazil, which produces geopropolis, a mixture of beeswax, plant resins, pollens and earth that is used for sealing beehives. OBJECTIVE: To extend the knowledge on phenolic compounds in fractions obtained by C18-solid phase extraction (SPE) of nine geopropolis samples from Melipona subnitida collected at different times. METHODOLOGY: Chromatographic profiles of nine samples of geopropolis from jandaíra were analysed by ultra-performance liquid chromatography coupled with a diode array detector and quadrupole time-of-flight mass spectrometry (UPLC-DAD-QTOF-MS/MS) and combined with the use of data-independent acquisition (MSE) for the profiling and structural characterisation of the phenolic compounds...
May 17, 2018: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/29770926/effect-of-mouthwashes-on-the-discolouration-of-restorative-materials-commonly-used-in-paediatric-dentistry
#14
N B Ulusoy, V Arikan, A Akbay Oba
AIM: This was to investigate the effects of Klorhex, Tantum Verde, Kloroben, and Listerine on the discolouration of composite resin, compomer, giomer, and resin-modified glass ionomer. METHODS: Fifty disc-shaped specimens from each restorative material (n = 50) were prepared; initial colour values were measured with a spectrophotometer. Forty specimens from each group were placed in the four different types of mouthwashes (n = 10), while the remaining 10 specimens were immersed in distilled water for 2 min, twice a day for a period of 3 weeks...
May 16, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29770877/polishing-effects-and-wear-performance-of-chairside-cad-cam-materials
#15
Mike Matzinger, Sebastian Hahnel, Verena Preis, Martin Rosentritt
OBJECTIVES: To investigate the surface roughness of CAD/CAM materials immediately after milling and after different chairside and labside polishing procedures. A two-body wear test was performed to compare the different wear characteristics of the materials and the corresponding antagonists. MATERIALS AND METHODS: Specimens (n = 12 per series) from different CAD/CAM materials (three composites: Lava Ultimate, Cerasmart, BRILLIANT Crios; one hybrid ceramic: VITA Enamic; three ceramics: Celtra Duo, VITA Suprinity, IPS Emax...
May 16, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29770578/effect-of-silicon-doped-calcium-phosphate-bone-grafting-materials-on-bone-regeneration-and-osteogenic-marker-expression-after-implantation-in-the-ovine-scapula
#16
Christine Knabe, Doaa Adel-Khattab, Wolf-Dietrich Hübner, Fabian Peters, Tom Knauf, Barbara Peleska, Dirk Barnewitz, Antje Genzel, Roderik Kusserow, Florian Sterzik, Michael Stiller, Christian Müller-Mai
Compared to the currently clinically available bone grafting materials for alveolar ridge augmentation, there is a great demand for bioactive bone substitutes with higher resorbability, which enhance osteogenesis at the same time. This has prompted the development of a silicon-doped rapidly resorbable calcium alkali orthophosphate (Si-CAOP) and silicon-doped β-tricalcium phosphate (Si-TCP). This study evaluated the effect of these two particulate graft materials as compared to the currently clinically used β-TCP on bone formation and osteogenic marker expression after 2 weeks, 1, 3, 6, 12, and 18 months of implantation in critical size defects in the sheep scapula...
May 16, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29768897/preparation-and-comparative-study-of-microporous-and-mesoporous-carbon-nanofibers-as-supercapacitor-electrodes
#17
Chang Ma, Jie Sheng, Yun Zhao, Ranran Wang, Haixia Zhang, Jingli Shi
Microporous carbon nanofibers (Mi-CNFs) and mesoporous carbon nanofibers (Me-CNFs) with high surface area were prepared by electrospinning resol resin/PVP/TEOS/F127 ethanol solution, followed by curing, carbonization and pickling process. TEOS was responsible for structural stability and producing micropores, while F127 for forming mesopores. Mi-CNFs showed high specific surface area of 1841 m2 g-1, while Me-CNFs possessed both high specific surface area of 1674 m2 g-1 and mesoporosity of 64%. The electrochemical test revealed that Mi-CNFs had higher capacitance (276 F g-1 at 0...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768847/synthesis-of-antioxidative-conductive-copper-inks-with-superior-adhesion
#18
Wei-Yang Ma, Yao-Yi Cheng, Jia-Kun Chen, Kai-Hsuan Chan, Zheng-Jie Lin, Wei-Hao Chou, Wei-Chen Chang
Conductive films have attracted much attention in the printed electronics industry. To date, expensive conductive silver inks have been utilized widely in these conductive films, which ultimately increase the cost. Hence the alternative low-cost copper inks will be of great interest in the future. This paper will present how to synthesize antioxidative conductive copper inks with superior adhesion to FR4 substrates. The antioxidative conductive copper inks were prepared by dispersing the antioxidative copper nanoparticles in diethylene glycol with the bisphenol-F type BEF170 epoxy resin as a binder and the Methyl-5-norbornene-2,3-dicarboxylic anhydride (NMA) as a curing agent, then were coated on FR4 substrates to form the copper films, followed by sintering at 250 °C in nitrogen atmosphere for 20 minutes...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768091/effect-of-830-nm-diode-laser-irradiation-of-root-canal-on-bond-strength-of-metal-and-fiber-post
#19
Claudia Strefezza, Marcello Magri Amaral, José Quinto, Sheila Cynthia Gouw-Soares, Claudia Bianchi Zamataro, Denise Maria Zezell
OBJECTIVE AND BACKGROUND: The correct selections of the cementing agent, the endodontic post material and placement protocol are critical to provide an increased longevity of the teeth that went through endodontic treatment. The irradiation with diode laser before post cementation, can promote an antimicrobial effect. However, there is a lack of information about the effect of 830 nm diode laser on the post bond strength. This study analyzed the effect of dentin root canal irradiation with high-intensity diode laser, at 830 nm, operating in continuous or pulsed mode, on the retention of metal or fiber posts, cemented with self-etching resinous composite (Panavia F) and zinc phosphate cement (ZnPO4 )...
May 16, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29767708/resinosis-inhibits-monochamus-spp-coleoptera-cerambycidae-colonization-of-healthy-shortleaf-pines-in-southeastern-united-states
#20
Matthew W Ethington, Larry D Galligan, Fred M Stephen
The genus Monochamus Dejean (Coleoptera: Cerambycidae) includes large, woodboring, longhorned beetles, which colonize pine trees in North America. Many authors have classified the genus as saprophagous, but one recent study reported successful colonization of standing jack pine trees (Pinus banksiana Lamb.) (Pinales: Pinaceae) following severe wind disturbance in Minnesota. We tested whether two Monochamus species native to the southeastern United States (M. titillator (Fabricius) and M. carolinensis (Olivier)) could successfully colonize healthy shortleaf pines (Pinus echinata Mill...
May 14, 2018: Environmental Entomology
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