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https://www.readbyqxmd.com/read/29350629/conductive-films-of-silver-nanoparticles-as-novel-susceptors-for-induction-welding-of-thermoplastic-composites
#1
Rouhollah Dermanaki Farahani, Mathieu Janier, Martine Dubé
In the present work, a conductive film of silver nanoparticles (nAg) as a novel heating element type, called susceptor was developed and tested for induction welding of carbon fiber/polyphenylene sulfide (CF/PPS) thermoplastic composites, i.e., unidirectional pre-impregnated16 plies of CF/PPS compression-molded in a quasi-isotropic stacking sequence. The nAg were synthesized, dispersed in deionized (DI) water and casted onto a pure PPS film, resulting in a conductive film upon the evaporation of DI water and thermal post-annealing...
January 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29349910/accuracy-of-a-new-elastomeric-impression-material-for-complete-arch-dental-implant-impressions
#2
Mirza R Baig, Muaiyed M Buzayan, Norsiah Yunus
AIM: The aim of the present study was to assess the accuracy of multi-unit dental implant casts obtained from two elastomeric impression materials, vinyl polyether silicone (VPES) and polyether (PE), and to test the effect of splinting of impression copings on the accuracy of implant casts. METHODS: Forty direct impressions of a mandibular reference model fitted with six dental implants and multibase abutments were made using VPES and PE, and implant casts were poured (N = 20)...
January 18, 2018: Journal of Investigative and Clinical Dentistry
https://www.readbyqxmd.com/read/29349626/a-two-stage-system-coupling-hydrolytic-acidification-with-algal-microcosms-for-treatment-of-wastewater-from-the-manufacture-of-acrylonitrile-butadiene-styrene-abs-resin
#3
Shuhao Huo, Feifei Zhu, Bin Zou, Ling Xu, Fengjie Cui, Wenhua You
OBJECTIVES: To demonstrate the effectiveness of a novel two-stage system coupling hydrolytic acidification with algal microcosms for the treatment of acrylonitrile butadiene styrene (ABS) resin-manufacturing wastewater. RESULTS: After hydrolytic acidification, the BOD5/COD ratio increased from 0.22 to 0.56, showing improved biodegradability of the wastewater. Coupled with hydrolytic acidification, the algal microcosms showed excellent capability of in-depth removal of COD, NH3-N and phosphorus with removal rates 83, 100, and 89%, respectively, and aromatic pollutants, including benzene, were almost completely removed...
January 18, 2018: Biotechnology Letters
https://www.readbyqxmd.com/read/29348105/report-preparation-of-levodopa-carbidopa-compound-drug-resins
#4
Hongfei Liu, Hui Ding, Dandan Zhang, - Fengsi, Changshan Sun
The main objective of this study was to prepare the levodopa/carbidopa compound drug resins and investigate affecting factors such as drug concentration, temperature, particle size. The drug resins were made by bath method and the effects of above factors during the process of preparation was studied. Studies on the stabilities of drugs and drug resins were carried out by HPLC. The Results showed that the preparation of drug resins was influenced by drug concentration, resin particle size, reaction temperature and solvent concentration...
January 2018: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29345707/synthesis-and-characterization-of-a-photocleavable-collagen-like-peptide
#5
Alfredo Ornelas, Kaitlyn N Williams, Kevin A Hatch, Aurelio Paez, Angela C Aguilar, Cameron C Ellis, Nishat Tasnim, Supriyo Ray, Carl W Dirk, Thomas Boland, Binata Joddar, Chunqiang Li, Katja Michael
A 34-amino acid long collagen-like peptide rich in proline, hydroxyproline, and glycine, and with four photoreactive N-acyl-7-nitroindoline units incorporated into the peptide backbone was synthesized by on-resin fragment condensation. Its circular dichroism supports a stable triple helix structure. The built-in photochemical function enables the decomposition of the peptide into small peptide fragments by illumination with UV light of 350 nm in aqueous solution. Illumination of a thin film of the peptide, or a thin film of a photoreactive amino acid model compound containing a 5-bromo-7-nitroindoline moiety, with femtosecond laser light at 710 nm allows for the creation of well-resolved micropatterns...
January 18, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29343715/effects-of-straw-application-on-nitrate-leaching-in-fields-in-the-yellow-river-irrigation-zone-of-ningxia-china
#6
Shiqi Yang, Yongsheng Wang, Ruliang Liu, Quanxin Li, Zhengli Yang
A five-year field experiment was conducted to investigate the effects of straw application on nitrate leaching loss. Treatments included soil that was not treated (control), soil treated with straw at a low rate (4,500 kg ha-2, T1) and soil treated with straw at a high rate (9,000 kg ha-2, T2). Nitrate-nitrogen leaching in the 10, 20, 30, 60, and 90 cm soil layers was measured using the resin-core method. The results indicated that straw application could reduce soil nitrate leaching losses in the 0-30 cm layer...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343187/mechanical-and-antibacterial-properties-of-benzothiazole-based-dental-resin-materials
#7
Wenbin Zhu, Chonghui Lao, Shuzhen Luo, Fang Liu, Qiting Huang, Jingwei He, Zhengmei Lin
A synthesized benzothiazole containing mono-methacrylate monomer BTTMA was incorporated into Bis-GMA/TEGDMA dental resin system with a series of mass concentration from 5 wt.% to 30 wt.% as an antibacterial agent. The influence of BTTMA on physicochemical properties of dental resin system, such as double bond conversion (DC), volumetric shrinkage (VS), flexural strength (FS) and modulus (FM), water sorption (WS) and solubility (SL) were investigated. Direct contact testing and agar diffusion testing were used to evaluate the antibacterial activity of BTTMA containing dental resin...
January 17, 2018: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29342840/evaluation-of-rapid-early-warning-approaches-to-track-shellfish-toxins-associated-with-dinophysis-and-alexandrium-blooms
#8
Theresa K Hattenrath-Lehmann, Mark W Lusty, Ryan B Wallace, Bennie Haynes, Zhihong Wang, Maggie Broadwater, Jonathan R Deeds, Steve L Morton, William Hastback, Leonora Porter, Karen Chytalo, Christopher J Gobler
Marine biotoxin-contaminated seafood has caused thousands of poisonings worldwide this century. Given these threats, there is an increasing need for improved technologies that can be easily integrated into coastal monitoring programs. This study evaluates approaches for monitoring toxins associated with recurrent toxin-producing Alexandrium and Dinophysis blooms on Long Island, NY, USA, which cause paralytic and diarrhetic shellfish poisoning (PSP and DSP), respectively. Within contrasting locations, the dynamics of pelagic Alexandrium and Dinophysis cell densities, toxins in plankton, and toxins in deployed blue mussels (Mytilus edulis) were compared with passive solid-phase adsorption toxin tracking (SPATT) samplers filled with two types of resin, HP20 and XAD-2...
January 13, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29339203/clinical-performance-of-full-rehabilitations-with-direct-composite-in-severe-tooth-wear-patients-3-5-years-results
#9
B A C Loomans, C M Kreulen, H E C E Huijs-Visser, B A M A Sterenborg, E M Bronkhorst, M C D N J M Huysmans, N J M Opdam
OBJECTIVES: To evaluate the mid-term clinical performance of direct composite restorations placed in patients with pathological tooth wear needing full rehabilitation with an increase of vertical dimension of occlusion. METHODS: In a prospective trial 34 patients (34.0 ± 8.4 years; 25 males, 9 females) were treated with a minimal invasive additive technique using composite restorations. The restorative treatment protocol was to provide all teeth with composite build-up restorations in an increased vertical dimension of occlusion (VDO) using the DSO-technique...
January 12, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29338276/evaluation-of-the-water-sorption-of-luting-cements-in-different-solutions
#10
Alma Gavranović-Glamoč, Muhamed Ajanović, Samra Korać, Selma Zukić, Sanela Strujić-Porović, Alma Kamber-Ćesir, Lejla Kazazić, Emir Berhamović
OBJECTIVE: To evaluate and compare the water sorption of three luting cements in three different solutions: distilled water and artificial saliva with different pH values (7.4 and 3.0). MATERIALS AND METHODS: Resin-modified glass-ionomer cement (GC Fuji Plus) and two resin cements (Multilink Automix and Variolink II) were used. A total of 45 specimens - 15 specimens (15x1 mm) for each cement were prepared according to ISO standard 4049:2009. The water sorptions of the cements were calculated by weighing the specimens before and after immersion and desiccation...
November 2017: Acta Medica Academica
https://www.readbyqxmd.com/read/29338231/a-fluorous-phase-approach-to-%C3%AE-hydroxytropolone-synthesis
#11
Michael P D'Erasmo, Ryan Patrick Murelli
α-Hydroxytropolones (αHTs) are troponoids that demonstrate inhibition against an array of therapeutically significant targets, making them potential drug leads for several human diseases. We have utilized a recently discovered one-pot three-component oxidopyrylium cycloaddition in a solid-supported synthesis of αHTs. Though the procedure is time efficient and generates assay-ready molecules, the system suffers from low yields and an inability to perform reaction modifications on resin-bound intermediates...
January 16, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29338200/solid-phase-synthesis-of-oligopeptides-containing-sterically-hindered-amino-acids-on-non-swellable-resin-using-3-nitro-1-2-4-triazol-1-yl-tris-pyrrolidin-1-yl-phosphonium-hexafluorophosphate-pyntp-as-the-condensing-reagent
#12
Rintaro Iwata Hara, Yuta Mitsuhashi, Keita Saito, Yuske Maeda, Takeshi Wada
Peptides are still difficult to synthesize when they contain sterically hindered amino acids such as α,α-di-substituted amino acids and N-substituted amino acids. In this study, solid-phase syntheses of oligopeptides containing multiple α-aminoisobutyric acid (Aib) residues were performed in high yields by using a non-swellable resin as the solid-support and 3-nitro-1,2,4-triazol-1-yl-tris(pyrrolidin-1-yl)phosphonium hexafluorophosphate (PyNTP) as the condensing reagent.
January 17, 2018: ACS Combinatorial Science
https://www.readbyqxmd.com/read/29336522/continued-root-maturation-despite-persistent-apical-periodontitis-of-immature-permanent-teeth-after-failed-regenerative-endodontic-therapy
#13
Louis M Lin, Sahng G Kim, Gabriela Martin, Bill Kahler
Three immature permanent teeth with pulp necrosis and apical periodontitis were treated with regenerative endodontic therapy (RET), which included root canal disinfection with sodium hypochlorite irrigation, intra-canal medication with calcium hydroxide paste, 17% EDTA rinse, induction of periapical bleeding into the canal, collagen matrix and MTA coronal seal, and composite resin restoration of access cavities. After different periods of follow-up, it was observed that continued root maturation, especially apical closure occurred despite persistent apical periodontitis of immature permanent teeth after failed RET...
January 16, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29335000/molecular-characterization-of-babesia-microti-thioredoxin-bmtrx2-and-its-expression-patterns-induced-by-antiprotozoal-drugs
#14
Jingwei Huang, Kang Xiong, Houshuang Zhang, Yanzhen Zhao, Jie Cao, Haiyan Gong, Yongzhi Zhou, Jinlin Zhou
BACKGROUND: Human babesiosis is an infectious disease that is epidemic in various regions all over the world. The predominant causative pathogen of this disease is the intra-erythrocytic parasite Babesia microti. The thioredoxin system is one of the major weapons that is used in the resistance to the reactive oxygen species (ROS) and reactive nitrogen species (RNS) produced by host immune system. In other intra-erythrocytic apicomplexans like the malaria parasite Plasmodium falciparum, anti-oxidative proteins are promising targets for the development of anti-parasitic drugs...
January 15, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29334734/a-method-for-selective-depletion-of-zn-ii-ions-from-complex-biological-media-and-evaluation-of-cellular-consequences-of-zn-ii-deficiency
#15
Christopher E R Richardson, Lisa S Cunden, Vincent L Butty, Elizabeth M Nolan, Stephen J Lippard, Matthew D Shoulders
We describe the preparation, evaluation, and application of an S100A12 protein-conjugated solid support, hereafter the "A12-resin," that can remove 99% of Zn(II) from complex biological solutions without significantly perturbing the concentrations of other metal ions. The A12-resin can be applied to selectively deplete Zn(II) from diverse tissue culture media and from other biological fluids, including human serum. To further demonstrate the utility of this approach, we investigated metabolic, transcriptomic, and metallomic responses of HEK293 cells cultured in medium depleted of Zn(II) using S100A12...
January 16, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29334663/acute-toxicity-screening-of-different-extractions-components-and-constituents-of-polygonum-multiflorum-thunb-on-zebrafish-danio-rerio-embryos-in-vivo
#16
Jian-Bo Yang, Wan-Fang Li, Yue Liu, Qi Wang, Xian-Long Cheng, Feng Wei, Ai-Guo Wang, Hong-Tao Jin, Shuang-Cheng Ma
Polygonum multiflorum Thunb. has been used widely in East Asia in treatment of diseases associated with aging. However, there are many reports referred to the toxicity of P. multiflorum, especially for liver adverse reactions. The toxicity of it is caused by over dosage or by the herb itself remains unclear. The aim of this study was to study the toxicity of different extractions, components and constituents of P. multiflorum, which were assessed in zebrafish embryos. Firstly, the difference of extracting solvent to the toxicity of P...
January 12, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29334400/oolong-tea-and-lr-white-resin-a-new-method-of-plant-sample-preparation-for-transmission-electron-microscopy
#17
Xiaohua He, Fuzhen Guo, Bin Liu
Simplifying sample processing, shortening the sample preparation time, and adjusting procedures to suitable for new health and safety regulations, these issues are the current challenges which electron microscopic examinations need to face. In order to resolve these problems, new plant tissue sample processing protocols for transmission electron microscopy should be developed. In the present study, we chose the LR-White resin-assisted processing protocol for the ultrastructural observation of different types of plant tissues...
January 15, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29334137/calcium-phosphate-precipitation-in-experimental-gaps-between-fluoride-containing-fast-setting-calcium-silicate-cement-and-dentin
#18
Bahram Ranjkesh, Ming Ding, Michel Dalstra, Jens R Nyengaard, Jacques Chevallier, Flemming Isidor, Henrik Løvschall
A novel fast-setting calcium silicate cement containing fluoride (novel-CSC) has been developed for applications in tooth crowns. The aim of this study was to assess the ability of the novel-CSC to close the experimental gaps at the dentin-cement interface. The novel-CSC was tested against Vitrebond and GC Fuji II LC. Experimental gaps of 50 or 300 μm width were created between the materials and dentin. Specimens with the 300-μm-wide gap were immersed in phosphate-buffered saline and the closed gap area was measured during 96 h...
January 15, 2018: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29333771/-effect-of-hydrofluoric-acid-concentration-on-the-surface-morphology-and-bonding-effectiveness-of-lithium-disilicate-glass-ceramics-to-resin-composites
#19
Qian Hailan, Ren Lingyan, Nie Rongrong, Meng Xiangfeng
OBJECTIVE: This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics. METHODS: After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333754/a-guide-to-analysis-and-reconstruction-of-serial-block-face-scanning-electron-microscopy-data
#20
E Cocks, M Taggart, F C Rind, K White
Serial block face scanning electron microscopy (SBF-SEM) is a relatively new technique that allows the acquisition of serially sectioned, imaged and digitally aligned ultrastructural data. There is a wealth of information that can be obtained from the resulting image stacks but this presents a new challenge for researchers - how to computationally analyse and make best use of the large datasets produced. One approach is to reconstruct structures and features of interest in 3D. However, the software programmes can appear overwhelming, time-consuming and not intuitive for those new to image analysis...
January 15, 2018: Journal of Microscopy
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