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Yang Wang, Xueping Kong, Wei Xu, Fengrui Jiang, Bao Li, Lixin Wu
A series of triol ligand [CH3 C(CH2 OH)3 ] covalently decorated polyoxometalates (POMs), which could be ascribed to the primary complexes with structural formulas {M2 [Mo2 O4 (CH3 C(CH2 O)3 )2 ]3 }2- (M = Cu2+ , Co2+ , Ni2+ , Zn2+ ), have been synthesized in organic solvents. Single-crystal X-ray structural analysis reveals that the synthesized polyanionic clusters are comprised of three {Mo2 } units and two divalent transition-metal ions connecting to each other in an alternating style, where all {Mo2 } blocks were covalently decorated by two triol ligands in the trans conformation...
March 19, 2018: Inorganic Chemistry
Xiao-Fang Wan, Bao-Lian Liu, Teng Yu, Ning Yan, Xin-Sheng Chai, You-Ming Li, Guang-Xue Chen
This work reports on a simple method for the determination of lysine content by an in situ sample pretreatment and headspace gas chromatographic measurement (HS-GC) technique, based on carbon dioxide (CO2 ) formation from the pretreatment reaction (between lysine and ninhydrin solution) in a closed vial. It was observed that complete lysine conversion to CO2 could be achieved within 60 min at 60 °C in a phosphate buffer medium (pH = 4.0), with a minimum molar ratio of ninhydrin/lysine of 16. The results showed that the method had a good precision (RSD < 5...
March 19, 2018: Analytical and Bioanalytical Chemistry
Jörg Dörrstein, Ronja Scholz, Dominik Schwarz, Doris Schieder, Volker Sieber, Frank Walther, Cordt Zollfrank
This article presents experimental data of organosolv lignin from Poacea grass and structural changes after compounding and injection molding as presented in the research article "Effects of high-lignin-loading on thermal, mechanical, and morphological properties of bioplastic composites" [1]. It supplements the article with morphological (SEM), spectroscopic (31 P NMR, FT-IR) and chromatographic (GPC, EA) data of the starting lignin as well as molar mass characteristics (mass average molar mass (Mw ) and Polydispersity (D)) of the extracted lignin...
April 2018: Data in Brief
Alkananda Chand, Bhagyashree Ronghe, Girish Byakod, Alok Ashok Lathi, Sangeeta Muglikar
Background: For dental implant planning in maxillary posterior region, it is essential to know their relationship with maxillary sinus. Maxillary posterior teeth affected by chronic periodontitis usually have a poor prognosis, ultimately leading to tooth loss. Following tooth loss, significant bone resorption occurs resulting in compromised remaining bone support for dental implant placement. Aim: The study aims to determine the relationship between inferior wall of maxillary sinus and the root apices of maxillary posterior teeth...
November 2017: Journal of Indian Society of Periodontology
Ye Jianwen, Hu Dingkai, Che Xuemei, Jiang Xiaoran, Li Teng, Chen Jinchun, Zhang Haoqian, Chen Guo-Qiang
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] is one of the most promising biomaterials expected to be used in a wide range of scenarios. However, its large-scale production is still hindered by the high cost. Here we report the engineering of Halomonas bluephagenesis as a low-cost platform for non-sterile and continuous fermentative production of P(3HB-co-4HB) from glucose. Two interrelated 4-hydroxybutyrate (4HB) biosynthesis pathways were constructed to guarantee 4HB monomer supply for P(3HB-co-4HB) synthesis by working in concert with 3-hydroxybutyrate (3HB) pathway...
March 15, 2018: Metabolic Engineering
Jennifer M K Wakefield, Richard B Gillis, Gary G Adams, Caitlin M A McQueen, Stephen E Harding
The heterogeneity and molecular weight of a chitosan of low molecular weight (molar mass) and low degree of acetylation (0.1) for potential use as a consolidant for decayed archaeological wood were examined by sedimentation velocity and sedimentation equilibrium in the analytical ultracentrifuge before and after depolymerisation. Sedimentation velocity before depolymerisation revealed a uniform distribution of sedimentation coefficient with little concentration dependence. SEDFIT-MSTAR analysis revealed a weight average molecular weight Mw of (14...
March 17, 2018: European Biophysics Journal: EBJ
Bin Zhang, Bo Meng, Edward Viloria, Adrien Naveau, Bernhard Ganss, Andrew H Jheon
The aim of this study was to evaluate the role of epithelial signal transducer and activator of transcription 3 (STAT3) in mouse incisor amelogenesis. Since Stat3 is expressed in the epithelial component of developing and adult mouse teeth, we generated and analyzed Krt14Cre/+;Stat3fl/fl mutant mice in which Stat3 was inactivated in epithelia including ameloblast progenitors and ameloblasts, the cells responsible for enamel formation. Histological analysis showed little enamel matrix in mutant incisors compared to controls...
March 16, 2018: Cells, Tissues, Organs
Patrick O Asekunowo, Rosenani A Haque, Mohd R Razali, Silas W Avicor, Mustafa F F Wajidi
A series of four benzimidazolium based nitrile-functionalized mononuclear-Ag(I)-N-heterocyclic carbene and binuclear-Ag(I)-N-heterocyclic carbene (Ag(I)-NHC) hexafluorophosphate complexes (5b-8b) were synthesized by reacting the corresponding hexafluorophosphate salts (1b-4b) with Ag2 O in acetonitrile, respectively. These compounds were characterized by1 H NMR,13 C NMR, IR, UV-visible spectroscopic techniques, elemental analyses and molar conductivity. Additionally, 8b was structurally characterized by single crystal X-ray diffraction technique...
March 13, 2018: European Journal of Medicinal Chemistry
Xiujuan Kong, Zihao Wu, Ziran Ren, Kaiheng Guo, Shaodong Hou, Zhechao Hua, Xuchun Li, Jingyun Fang
Degradation of three lipid regulators, i.e., gemfibrozil, bezafibrate and clofibric acid, by a UV/chlorine treatment was systematically investigated. The chlorine oxide radical (ClO• ) played an important role in the degradation of gemfibrozil and bezafibrate with second-order rate constants of 4.2 (±0.3) × 108  M-1  s-1 and 3.6 (±0.1) × 107  M-1  s-1 , respectively, whereas UV photolysis and the hydroxyl radical (HO• ) mainly contributed to the degradation of clofibric acid. The first-order rate constants (k') for the degradation of gemfibrozil and bezafibrate increased linearly with increasing chlorine dosage, primarily due to the linear increase in the ClO• concentration...
March 6, 2018: Water Research
S Daguerre-Martini, M B Vanotti, M Rodriguez-Pastor, A Rosal, R Moral
Gas-permeable membranes coupled with low-rate aeration is useful to recover ammonia (NH4 + ) from livestock effluents. In this study, the role of inorganic carbon (bicarbonate, HCO3 - ) to enhance the N recovery process was evaluated using synthetic effluents with various NH4 + to HCO3 - molar ratios of 0.5, 1.0, 1.5 and 2.0. The study also evaluated the effect of increased organic matter on the NH4 + recovery using humic acids (3000-6000 mg L-1 ), and the N recovery from high-strength swine manure. The release of hydroxide from the HCO3 - with aeration increased the wastewater pH and promoted gaseous ammonia formation and membrane uptake...
March 6, 2018: Water Research
Dandan Yao, Lei Zhang, Jiaojiao Huang, Chenghong Sun, Yu Zhang, Xiaoli Gu, Chong-Zhi Wang, Fei Li, Lina Chen, Chun-Su Yuan
In this work, surface magnetic molecularly imprinted polymers (SMMIPs) were synthesized and used as artificial receptors in the dispersive magnetic solid phase extraction (DMSPE) for capturing potential neuronal nitric oxide synthase-post synaptic density protein-95 (nNOS-PSD-95) uncouplers, which is known as neuroprotection against stroke. Factors that affected selective separation and adsorption of the artificial receptors, such as the amount of template, the types of functional monomer and porogen solvents, and the molar ratio of template/functional monomer/cross-linker were optimized...
March 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
Elsa Garot, Alice Denis, Yves Delbos, David Manton, Mihiri Silva, Patrick Rouas
OBJECTIVES: Molar Incisor Hypomineralisation (MIH) and Hypomineralised Second Primary Molars (HSPM) involve qualitative structural developmental anomalies of tooth enamel affecting the first permanent molars (and often incisors) and the second primary molars, respectively. A putative relationship between HSPM and MIH has been reported in the scientific literature. The aim was to determine whether children with HSPM are more likely to develop MIH. SOURCE: A systematic search using PubMed/Medline, Embase and Cochrane Library electronic databases for publications from 2001 to August 2017 investigating the link between MIH and HSPM was undertaken...
March 14, 2018: Journal of Dentistry
Jing-Jy Cheng, Chi-Hsein Chao, Mei-Kuang Lu
Sulfated polysaccharides (SPSs) were isolated from 0.5 mM potassium-sulfate fed Antrodia cinnamomea. We investigated the chemical properties and bio-activities of the five different fractions (SPS-K1, SPS-K2, SPS-K3, SPS-K4, and SPS-K5) with molecular weights ranging from 0.51 to 523.48 kDa. SPS-K3 was consisted mainly of glucose, galactose and sulfate in a molar ratio of 15:1:30 with Mn value of 6.82 kDa. It showed maximal inhibition of the tumor necrosis factor (TNF-α), interleukin-1beta (IL-1β) and interleukin-6 (IL-6) on bacterial LPS-induced inflammation in RAW264...
March 14, 2018: International Journal of Biological Macromolecules
Jianfang Lv, Hongying Yang, Zhenan Jin, Minglei Zhao
In this study, a novel process was developed for extracting lead from the hazardous waste cathode ray tube (CRT) funnel glass and simultaneously producing glass-ceramics. CRT funnel glass was mixed with coal fly ash and subjected to carbon thermal reduction with the addition of CaO. The homogeneous glass melt and reduced metallic lead were quenched in water. Glass-ceramics were produced from the parent glass through an appropriate heat treatment. The optimum carbon loading amount (calculated as the molar ratio of C/PbO), CaO/SiO2 ratio, smelting temperature and holding time for lead recovery were 1...
March 14, 2018: Waste Management
Martin Vorster, Peet J van der Vyver, Farzana Paleker
INTRODUCTION: The aim of this study was to compare the glide path preparation times of stainless steel hand files, PathFiles (Dentsply Sirona, Ballaigues, Switzerland), and the WaveOne Gold Glider (Dentsply Sirona). The preparation times for final root canal shaping with the Primary WaveOne Gold instrument in extracted human molar teeth with and without prior glide path preparation were also recorded and compared. METHODS: Mesiobuccal canals of 60 extracted human mandibular molars (curvature angles between 25° and 35° and radii <10 mm) were selected and randomly divided into 4 groups with 15 canals each...
March 14, 2018: Journal of Endodontics
Salahaddin Zahedi, Maryam Mostafavi, Neda Lotfirikan
INTRODUCTION: The present study aimed to anatomically assess mandibular posterior teeth using cone-beam computed tomographic (CBCT) imaging for endodontic surgery. METHODS: A total of 170 CBCT scans were evaluated for anatomic variations of mandibular posterior teeth. All the scans were obtained using a Planmeca Promax CBCT unit (Planmeca, Helsinki, Finland) with exposure settings of 90 kVp, 12 mA, 12 seconds, and 0.3-mm resolution. All CBCT images were reconstructed by Romexis Viewer 3...
March 14, 2018: Journal of Endodontics
Sonntana Seang, Prasit Pavasant, Chalida N Limjeerajarus
INTRODUCTION: Angiogenesis is a key determinant in dental pulp regeneration. Iloprost is a synthetic prostacyclin that promotes angiogenesis. A three-dimensional culture that mimics the in vivo condition has been used in tissue engineering. This study investigated the effect of iloprost on promoting dental pulp angiogenesis by using the tooth slice organ culture system. METHODS: Tooth slices with intact pulp tissue were cut from molars extracted from 12 patients...
March 14, 2018: Journal of Endodontics
Priscilla Coutinho Romualdo, Marília P Lucisano, Francisco Wanderley G Paula-Silva, Graziela B Leoni, Manoel D Sousa-Neto, Raquel Assed B Silva, Lea Assed B Silva, Paulo Nelson-Filho
INTRODUCTION: The aim of this study was to evaluate the gene expression of proinflammatory cytokines, matrix metalloproteinases (MMPs), and cathepsin K in apical periodontitis (AP) and the volume of lesions in ovariectomized and sham-operated rats. METHODS: Twenty 12-week-old female Wistar rats were subjected to ovariectomy (OVX) or sham surgery. After 9 weeks, access cavities were prepared in the maxillary and mandibular first molars, pulp tissue was removed, and canals were exposed to the oral environment during 21 days for the induction of AP...
March 14, 2018: Journal of Endodontics
Shijie Li, Shiwei Hu, Wei Jiang, Yanping Liu, Yingtang Zhou, Yu Liu, Liuye Mo
A huge challenge in the field of pollutant removal is the scarcity of visible-light-driven (VLD) photocatalysts that are efficient, stable, easily recyclable and capable of mineralizing organic pollutants. In this regard, a novel hierarchical architecture of Bi2 MoO6 nanosheets onto NiTiO3 nanofibers for tetracycline hydrochloride (TC) removal was rationally designed and fabricated via a facile approach. In this heterojunction system, highly homogeneous-distributed Bi2 MoO6 nanosheets were anchored on electrospun NiTiO3 nanofibers, endowing the heterojunction with compact interfacial contact...
March 13, 2018: Journal of Colloid and Interface Science
José María Martínez-González, María Martín-Ares, Natalia Martínez-Rodríguez, Cristina Barona-Dorado, Javier Sanz-Alonso, Jorge Cortés-Bretón-Brinkmann, Javier Ata-Ali
OBJECTIVE: The present split-mouth prospective study involves an immunohistochemical evaluation of peri-implant soft tissue healing after the osseointegration period, comparing submerged and transmucosal approaches using two-piece implant systems. The null hypothesis was that both surgical procedures elicit a similar immune response of the peri-implant soft tissues. DESIGN: Thirty-one healthy patients were included in this study, in which two implants were placed in the right and left maxillary pre-molar regions...
March 12, 2018: Archives of Oral Biology
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