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https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#1
A L Rufus, Padma S Kumar, K Jeena, S Velmurugan
Gadolinium as gadolinium nitrate is used as neutron poison in the moderator system for regulating and controlling the power generation of Pressurized Heavy Water Reactors (PHWR) and proposed to be used in Advanced Heavy Water Reactors (AHWR) owing to its high neutron absorption cross section. Removal of the added gadolinium nitrate (Gd(3+) and NO3(-)) from the system after its intended use is done using ion exchange resins. In the present investigation, attempts have been made to optimize the ion exchange process for generation of low radioactive waste and maximize utilization of the ion exchange resins by employing different types of resins and different modes of operation...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822249/en-masse-pyrolysis-of-flexible-printed-circuit-board-wastes-quantitatively-yielding-environmental-resources
#2
Jang Won Kim, Albert S Lee, Seunggun Yu, Jeong Whan Han
This paper reports the recycling of flexible printed circuit board (FPCB) waste through carbonization of polyimide by dual pyrolysis processes. The organic matter was recovered as pyrolyzed oil at low temperatures, while valuable metals and polyimide-derived carbon were effectively recovered through secondary high temperature pyrolysis. The major component of organics extracted from FPCB waste comprised of epoxy resins were identified as pyrolysis oils containing bisphenol-A. The valuable metals (Cu, Ni, Ag, Sn, Au, Pd) in waste FPCB were recovered as granular shape and quantitatively analyzed via ICP-OES...
August 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822184/-analyzing-crude-processed-root-of-polygonum-multiflorum-from-different-habitats-by-uplc-fingerprint-and-mode-identification-methods
#3
Rong Xiao, Yan Lin, Si-Min Lei, Ying Zhang, Jie Huang, Bo-Hou Xia, Chun Li, Duan-Fang Liao, Ping Wu, Li-Mei Lin
To establish a content determination method for 2,3,5,4'-tetrahydroxy stilbene-2-O-β-D-glucoside (TSG) of the crude/processed root of Polygonum multiflorum from different habitats in China and set up the fingerprint by using UPLC. Various samples were pretreated by macro-porous resin. Then UPLC analysis was performed on Waters ACQUITY UPLC@BEH C18 chromatographic column (2.1 mm×50 mm, 1.7 μm) at (25±5) ℃. A binary gradient elution system was composed of acetonitrile (phase A) and 0.5% acetic acid solution (phase B)...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822138/light-microscopy-transmission-electron-microscopy-and-immunohistochemistry-protocols-for-studying-photorespiration
#4
Roxana Khoshravesh, Vanessa Lundsgaard-Nielsen, Stefanie Sultmanis, Tammy L Sage
High-resolution images obtained from plant tissues processed for light microscopy, transmission electron microscopy, and immunohistochemistry have provided crucial links between plant subcellular structure and physiology during photorespiration as well as the impact of photorespiration on plant evolution and development. This chapter presents established protocols to guide researchers in the preparation of plant tissues for high-resolution imaging with a light and transmission electron microscope and detection of proteins using immunohistochemistry...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28821849/the-preparation-and-application-of-a-graphene-based-hybrid-flame-retardant-containing-a-long-chain-phosphaphenanthrene
#5
Wenhua Chen, Yuansen Liu, Pengju Liu, Changan Xu, Yuan Liu, Qi Wang
A novel hybrid flame retardant combining graphene oxide (GO) with long-chain phosphaphenanthrene was fabricated via surface grafting reaction. Taking advantageous of the double barrier effects, including the physical shield contributed by graphene nanoplates during the initial stage and the chemical char contributed by phosphaphenanthrene during the later stage, greatly decreased the release rate of decomposed volatiles from the resin, as well as minimized the release of oxygen and combustion heat. Hence, such hybrid flame retardant can overcome the shortcomings of early acid catalyzed degradation effects caused by conventional flame retardants containing phosphorus...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821153/combination-of-microsized-mineral-particles-and-rosin-as-a-basis-for-converting-cellulosic-fibers-into-sticky-superhydrophobic-paper
#6
Xiaoyan Yu, Peiwen Bian, Yang Xue, Xueren Qian, Haipeng Yu, Wenshuai Chen, Xiaohai Hu, Peng Wang, Dong Wu, Qinghui Duan, Limei Li, Jing Shen, Yonghao Ni
The unique features of cellulosic paper including flexibility, biodegradability, and low cost enables it as a versatile, sustainable biomaterial for promising applications. In the paper industry, microsized mineral particles are widely used in the production of printing/writing paper grades, while rosin derived from trees is the earliest internal sizing agent for paper hydrophobication. On the basis of existing commercial practices associated with the use of mineral particles and rosin in paper production, we present a process concept of converting cellulosic fibers (paper-grade pulp) into "sticky" superhydrophobic paper involving the use of microsized mineral particles and rosin (a tree-derived natural product, mainly a mixture of resin acids, especially abietic acid with chemical formula of C19H29COOH)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821050/clean-approach-to-synthesis-of-graphene-like-cufe2o4-polysaccharide-resin-nanohybrid-bifunctional-compound-for-dye-adsorption-and-bacterial-capturing
#7
Mostafa Hossein Beyki, Sarina Ehteshamzadeh Ganjbakhsh, Sara Minaeian, Farzaneh Shemirani
Focus of this research is on employment of a green route to prepare magnetic CuFe2O4@polysaccharide resin for environmental remediation purpose. The method is including solvent free solid state synthesis of copper ferrite nanoparticles by combustion route using cellulose as fuel. Then polysaccharide resin as well as its magnetic composite was prepared by using glucose, citric acid and copper ferrite as solid raw materials. Characterization study using FESEM and TEM images showed that as synthesized resin possesses graphene like structure as ferrite nanoparticles are dispersed in the matrice of resin...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820489/the-effect-of-hydrogen-bonding-in-enhancing-the-ionic-affinities-of-immobilized-monoprotic-phosphate-ligands
#8
Spiro D Alexandratos, Xiaoping Zhu
Environmental remediation requires ion-selective polymers that operate under a wide range of solution conditions. In one example, removal of trivalent and divalent metal ions from waste streams resulting from mining operations before they enter the environment requires treatment at acidic pH. The monoethyl ester phosphate ligands developed in this report operate from acidic solutions. They have been prepared on polystyrene-bound ethylene glycol, glycerol, and pentaerythritol, and it is found that intra-ligand hydrogen bonding affects their metal ion affinities...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28818618/ctenopharyngodon-idella-p53-mediates-between-nf-%C3%AE%C2%BAb-and-pkr-at-the-transcriptional-level
#9
Qingli Huang, Dingkun Xie, Huiling Mao, Haizhou Wang, Zhen Wu, Keyi Huang, Yiqi Wan, Qun Xu, Chengyu Hu
p53, NF-κB and PKR are well-known to be involved in antiviral response. Although p53 has been reported in fish, its role in the regulation of NF-κB and PKR is not well understood. Here, we cloned and characterized the full length of cDNA sequence of grass carp (Ctenopharyngodon idella) p53 (Cip53) and its promoter sequence. The full length cDNA of Cip53 was 1879 bp with an ORF of 1116 bp encoding a polypeptide of 371 amino acids. Phylogenetic tree analysis revealed that Cip53 shares high homology with Dario rerio p53 (Drp53)...
August 14, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28818329/influence-of-different-packing-methods-on-the-hydrodynamic-stability-of-chromatography-columns
#10
M Dorn, F Eschbach, D Hekmat, D Weuster-Botz
It is well known that packing non-uniformity may cause peak asymmetry and limit the performance of packed-bed chromatographic columns. However, understanding of the reasons leading to packing non-uniformity is still limited. Therefore, the effect of different column packing methods, i.e. dynamic axial compression (DAC), flow packing, and combinations of both on the hydrodynamic packing heterogeneity and stability of packings composed of polymer-based compressible porous resins with a mean diameter of 90μm was investigated experimentally as well as in-silico...
August 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28817736/performance-of-class-i-composite-restorations-when-polished-immediately-or-after-one-day-water-storage
#11
Masao Irie, Yukinori Maruo, Goro Nishigawa
This study investigated the effects on gap formation in Class I restorations (observed by vertical and horizontal forms of inspection) and on the mechanical properties of nine resin composite filling materials when the restorations were subject to finishing immediately after setting or after one-day water storage. Class I restorations with resin composite fillings were polished either immediately (3 min) after setting or after one-day water storage. Interfacial gap formation (observed by vertical inspection) was assessed using 14 gap measurement points along the interface between the restoration and cavity walls and floor (n = 10 per resin composite; total points measured per time point = 140)...
2017: PloS One
https://www.readbyqxmd.com/read/28816189/effect-of-different-dentifrices-on-the-surface-roughness-of-acrylic-resins-an-in-vitro-study
#12
Nitin Gautam, Aditi Sharma, Unjum Bashir, Sisir Rapolu, Nallamilli Mamatha, Siripurapu Sravani
AIM: This study was undertaken to study the effect of three most commonly used dentifrices for denture cleaning and to find out any positive association between number of strokes by toothbrush and surface roughness of acrylic resin. MATERIALS AND METHODS: About 40 acrylic rectangular blocks with high finish were polished until surface roughness was calculated as 0 pirn. The materials tested were distilled water as a control group, Patanjali Dant Kanti, Colgate Total Cream, and Cleansodent as dentifrices...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28816187/comparison-of-film-thickness-of-two-commercial-brands-of-glass-lonomer-cement-and-one-dual-cured-composite-an-in-vitro-study
#13
Rajat R Khajuria, Rishav Singh, Pranamee Barua, Nausheen Hajira, Naveen Gupta, Rohit R Thakkar
AIM: The present study is undertaken to examine the film thickness of three most commonly used luting cements and to determine their usage as a luting agent. MATERIALS AND METHODS: This study was carried out strictly according to the guidelines of American Dental Association (ADS) specification no. 8. Two glass slabs of 5 cm in length and 2 cm in width were used. One glass slab was kept over the other glass slab and the space between the two glass slabs was measured using metallurgical microscope at the power of 10*...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28816183/impact-of-polishing-systems-on-the-surface-roughness-and-microhardness-of-nanocomposites
#14
Yasser Alfawaz
AIM: The aim of this article is to evaluate the influence of finishing and polishing techniques on the surface roughness and microhardness of two composite resins with two different types of polishing systems. MATERIALS AND METHODS: A total of 30 disk-shaped specimens of nanocomposite Filtek™ Z350 and Ceram-X® were prepared. They were divided into three groups. The control group (n = 10) received no finishing and polishing. The remaining specimens were divided into two groups, and they received polishing and finishing either with PoGo or Sof-Lex system...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815249/-effect-of-hemostatic-agent-on-bonding-strength-of-deciduous-tooth-dentin
#15
Qiu-Hua Pan, Da-Wei Huang, Qing-Tai Wang
PUPPOSE: To investigate the effect of hemostatic agent on bonding strength of deciduous tooth dentin. METHODS: Forty deciduous molars were used to make dentin grinding model and randomly divided into observation group and control group, 20 teeth in each group. Teeth in the observation group were covered with hemostatic agent for 30s, and then washed, followed by processing; while teeth in the control group were subjected to bonding directly. Micro tensile bond strength and micro leakage were measured and compared in the two groups...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814859/inhibitory-effect-of-zirconium-oxide-nanoparticles-on-candida-albicans-adhesion-to-repaired-polymethyl-methacrylate-denture-bases-and-interim-removable-prostheses-a-new-approach-for-denture-stomatitis-prevention
#16
Mohammed M Gad, Ahmad M Al-Thobity, Suliman Y Shahin, Badar T Alsaqer, Aiman A Ali
BACKGROUND: Despite drawbacks, cold-cured acrylic resin is still the most common material used in denture repair. Zirconia nanoparticles were among the reinforcements added to increase the strength of the resin. The effect on Candida due to the addition of zirconia nanoparticles to the resin has not been investigated. PURPOSE: The aim of this study was to evaluate the effect of zirconia nanoparticles added to cold-cured acrylic resin on Candida albicans adhesion...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28813594/facile-purification-of-milligram-to-gram-quantities-of-condensed-tannins-according-to-mean-degree-of-polymerization-and-flavan-3-ol-subunit-composition
#17
Ron Herbert Brown, Irene Mueller-Harvey, Wayne E Zeller, Laurie Reinhardt, Elisabetta Stringano, An Gea, Chris Drake, Honorata M Ropiak, Christos Fryganas, Aina Ramsay, Emily E Hardcastle
Unambiguous investigation of condensed tannin (CT) structure-activity relationships in biological systems requires well-characterized, high-purity CTs. Sephadex LH-20 and Toyopearl HW-50F resins were compared for separating CTs from acetone/water extracts and column fractions analyzed for flavan-3-ol subunits, mean degree of polymerization (mDP) and purity. Toyopearl HW-50F generated fractions with higher mDP values and better separation of procyanidins (PC) and prodelphinidins (PD) but required a pre-purification step, more time for large scale purifications and gave poorer recoveries...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28812169/bond-strength-of-etch-and-rinse-and-self-etch-adhesive-systems-to-enamel-and-dentin-irradiated-with-a-novel-co2-9-3%C3%A2-%C3%AE-m-short-pulsed-laser-for-dental-restorative-procedures
#18
Peter Rechmann, N Bartolome, R Kinsel, R Vaderhobli, B M T Rechmann
The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used...
August 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28811751/bioactive-potential-of-3d-printed-oleo-gum-resin-disks-b-papyrifera-c-myrrha-and-s-benzoin-loading-nanooxides-tio2-p25-cu2o-and-moo3
#19
Diogo José Horst, Sergio Mazurek Tebcherani, Evaldo Toniolo Kubaski, Rogério de Almeida Vieira
This experimental study investigates the bioactive potential of filaments produced via hot melt extrusion (HME) and intended for fused deposition modeling (FDM) 3D printing purposes. The oleo-gum-resins from benzoin, myrrha, and olibanum in pure state and also charged with 10% of metal oxide nanoparticles, TiO2, P25, Cu2O, and MoO3, were characterized by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray microanalysis (EDXMA), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28808944/effect-of-ha330-resin-directed-hemoadsorption-on-a-porcine-acute-respiratory-distress-syndrome-model
#20
Xuefeng Xu, Chune Jia, Sa Luo, Yanming Li, Fei Xiao, Huaping Dai, Chen Wang
BACKGROUND: Blood purification is an emerging approach to dampening the cytokine storm. This study aims to assess the efficacy of HA330 resin-directed hemoadsorption (HA) on endotoxin-induced porcine acute respiratory distress syndrome (ARDS) model. METHODS: Twenty-four Chinese domestic pigs were allocated into saline group receiving intravenous infusion of saline (N = 6) and endotoxin group receiving intravenous infusion of LPS (N = 18). When ALI model was initially diagnosed, six pigs in the LPS and saline group were killed for BALF and histopathological analysis...
August 14, 2017: Annals of Intensive Care
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