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https://www.readbyqxmd.com/read/29691746/fixed-bed-operation-for-manganese-removal-from-water-using-chitosan-bentonite-mno-composite-beads
#1
Anthony M Muliwa, Taile Y Leswifi, Arjun Maity, Aoyi Ochieng, Maurice S Onyango
In the present study, a new composite adsorbent, chitosan/bentonite/manganese oxide (CBMnO) beads, cross-linked with tetraethyl-ortho-silicate (TEOS) was applied in a fixed-bed column for the removal of Mn (II) from water. The adsorbent was characterised by scanning electron microscopy (SEM), Fourier transform infra-red (FT-IR), N2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS) techniques, and moreover the point of zero charge (pHpzc ) was determined. The extend of Mn (II) breakthrough behaviour was investigated by varying bed mass, flow rate and influent concentration, and by using real environmental water samples...
April 24, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29691742/effects-of-mining-activities-on-evolution-of-water-chemistry-in-coal-bearing-aquifers-in-karst-region-of-midwestern-guizhou-china-evidences-from-%C3%AE-13-c-of-dissolved-inorganic-carbon-and-%C3%AE-34-s-of-sulfate
#2
Qingguang Li, Pan Wu, Xuefang Zha, Xuexian Li, Linna Wu, Shangyi Gu
The generation of acid mine drainage (AMD) may accelerate watershed erosion and promote the migration of heavy metals, then threaten local ecosystems such as aquatic life and even human health. Previous studies have focused primarily on influence of AMD in surface environment. In order to reveal the acidizing processes in karst high-sulfur coalfield in Southwest China, this study, by contrast, focused on the hydrogeochemical evolution process and acidification mechanism of mine water in Zhijin coalfield, western Guizhou Province...
April 24, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29687636/seasonal-changes-in-the-vertical-distribution-of-two-types-of-multicellular-magnetotactic-prokaryotes-in-the-sediment-of-lake-yuehu-china
#3
Jia Liu, Wenyan Zhang, Haijian Du, Xiaoyun Leng, Jin-Hua Li, Hongmiao Pan, Jianhong Xu, Long-Fei Wu, Tian Xiao
There are two genetically distinct morphological types of multicellular magnetotactic prokaryotes (MMPs) in the intertidal zone of Lake Yuehu (China): ellipsoidal MMPs (eMMPs) and spherical MMPs (sMMPs). We studied the vertical distribution of both types of MMPs in the sediment at Lake Yuehu during one year. Both types of MMPs were observed at sediment depths ranging from 1 to 34 cm, depending on the seasons. The eMMPs distributed at depths of 2-34 cm during spring, 1-11 cm during summer, 2-21 cm during autumn, and 9-32 cm during winter...
April 24, 2018: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29685600/formulation-of-sludge-incineration-residue-based-geopolymer-and-stabilization-performance-on-potential-toxic-elements
#4
Shichang Sun, Junhao Lin, Lin Fang, Rui Ma, Zhu Ding, Xianghua Zhang, Xuxin Zhao, Yilin Liu
Using sludge incineration residue (SIR) to prepare SIR-based geopolymer can realize the minimization and reclamation of urban sludge as well as the stabilization of potential toxic elements. This work has researched the critical factors that influence the formulation of SIR-based geopolymer and the stabilization performance on potential toxic elements. Results showed that the addition amount of SIR had significant influence on the compressive strength of geopolymer, while the modules of sodium silicate and the sodium silicate/metakaolin ratio had little influence thereon...
April 20, 2018: Waste Management
https://www.readbyqxmd.com/read/29684883/cadmium-stabilization-via-silicates-formation-efficiency-reaction-routes-and-leaching-behavior-of-products
#5
Minhua Su, Jinfeng Tang, Changzhong Liao, Lingjun Kong, Tangfu Xiao, Kaimin Shih, Gang Song, Diyun Chen, Hongguo Zhang
Stabilizing cadmium by incorporating it into crystalline products is an effective approach to detoxify cadmium-containing wastes. In this study, two Si-rich matrices in amorphous and crystalline forms (i.e., silica fume and α-quartz, respectively) were employed to incorporate Cd. The processing parameters, namely the type of Si-rich matrix, Cd/Si molar ratio (Г) and sintering temperature, were thoroughly investigated using quantitative X-ray diffraction technique. Cd incorporation was more energetically favored when silica fume was used rather than when α-quartz was used because of the lower Gibbs free energy of formation for silica fume...
April 20, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29684775/a-facile-sol-gel-synthesis-of-low-fusing-titanium-opaque-porcelain-using-borate-silicate-system-and-its-bioactivity
#6
Beijing Xue, Wenhao Wang, Litong Guo, Xuanru Ren, Xueyu Tao, Yinghuai Qiang
The titanium opaque porcelain was synthesized through sol-gel using borate-silicate system. The porcelain was characterized by DSC-TG, X-ray diffraction, N2 adsorption-desorption isotherms and scanning electron microscope tests. The results of DSC showed that the nitrates could be decomposed completely when the bioglass xerogel precursor was heat-treated at 760 ℃. The XRD results showed that the Na2 Ca3 Si6 O16 was the major phase of the opaque porcelain. The synthesized opaque porcelain powders had an average particle size of about 5-25 µm with nanopores of around 50-70 nm on the surface...
April 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29683245/cu-b2-so4-4-and-cu-b-so4-2-hso4-two-silicate-analogue-borosulfates-differing-in-their-dimensionality-a-comparative-study-of-stability-and-acidity
#7
Jörn Bruns, Maren Podewitz, Klaus R Liedl, Oliver Janka, Rainer Pöttgen, Hubert Huppertz
Borosulfates are an ever-expanding class of compounds and the extent of their properties is still elusive. In this contribution, the first two copper borosulfates Cu[B2(SO4)4] and Cu[B(SO4)2(HSO4)] are presented, which are structurally related but show different dimensionalities in their substructure: While Cu[B2(SO4)4] reveals an anionic chain, (_∞^1)[B〖(〖SO〗_4)〗_(4⁄2) ]^- , with both, a twisted and a unique chair conformation of the B(SO4)2B subunits, Cu[B(SO4)2(HSO4)] reveals [B2(SO4)4(HSO4)2]4--anions showing exclusively a twisted conformation...
April 23, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29682752/mineral-density-in-carious-dentine-after-treatment-with-calcium-silicates-and-polyacrylic-acid-based-cements
#8
P M Pires, T P Santos, A Fonseca-Gonçalves, M M Pithon, R T Lopes, A A Neves
AIM: To test the hypothesis that polyacrylic acid-based and calcium silicate materials are able to increase mineral density of artificially demineralized dentine produced by a microcosm model for caries formation. METHODOLOGY: Forty-five dentine cavities were prepared in 9 sound human third molars (5 in each tooth). Specimens received a bacterial inoculum and were incubated in BHI plus 5% of sucrose for 96h to allow biofilm formation. After that, the specimens were scanned in a high energy micro-CT (baseline stack) and then, each cavity was filled with different cements: zinc polycarboxylate (Poly Zinc™ , Prevest DenPro, Jammu, India), conventional glass ionomer (Ketac Molar, 3M ESPE, Seefeld, Germany) and two calcium silicate based materials (MTA, Angelus, Londrina, Brazil and Biodentine™ , Septodont, Saint Maur des Fosses, France) while the central cavity was filled with utility wax (negative control)...
April 22, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29681480/outcome-of-endodontic-surgery-a-meta-analysis-of-the-literature-part-3-comparison-of-endodontic-microsurgical-techniques-with-2-different-root-end-filling-materials
#9
REVIEW
Meetu R Kohli, Homayon Berenji, Frank C Setzer, Su-Min Lee, Bekir Karabucak
INTRODUCTION: The aim of the present study was to investigate the influence of root-end preparation and filling material on endodontic surgery outcome. A systematic review and meta-analysis was conducted to determine the outcome of resin-based endodontic surgery (RES, the use of high-magnification preparation of a shallow and concave root-end cavity and bonded resin-based root-end filling material) versus endodontic microsurgery (EMS, the use of high-magnification ultrasonic root-end preparation and root-end filling with SuperEBA [Keystone Industries, Gibbstown, NJ], IRM [Dentsply Sirona, York, PA], mineral trioxide aggregate [MTA], or other calcium silicate cements)...
April 19, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29680722/effect-of-calcium-hydroxide-dressing-on-the-dentinal-tubule-penetration-of-2-different-root-canal-sealers-a-confocal-laser-scanning-microscopic-study
#10
Emel Uzunoglu-Özyürek, Özge Erdoğan, Sevinç Aktemur Türker
INTRODUCTION: The purpose of this study was to evaluate the effect of calcium hydroxide (Ca[OH]2 ) dressing on the dentinal tubule penetration of epoxy resin-based sealer (AH 26; Dentsply Maillefer, Ballaigues, Switzerland) and tricalcium silicate-based sealer (BioRoot RCS; Septodont, Saint Maurdes Fosses, France). METHODS: Fifty-two single-rooted mandibular premolars were used. Four samples were assigned as the positive control. Twenty-four samples received Ca(OH)2 labeled with rhodamine B, whereas the rest did not...
April 18, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29679834/microeukaryotic-biogeography-in-the-typical-subtropical-coastal-waters-with-multiple-environmental-gradients
#11
Huajun Zhang, Xiaolin Huang, Lei Huang, Fangjian Bao, Shangling Xiong, Kai Wang, Demin Zhang
The determinants of microeukaryotic biogeography in coastal waters at a regional scale remain largely unclear. The coastal northern Zhejiang (in the East China Sea) is a typical subtropical marine ecosystem with multiple environmental gradients that has been extensively perturbed by anthropogenic activities. Thus, it is a valuable region to investigate the key drivers that shape microbial biogeography. We investigated microeukaryotic communities in surface waters from 115 stations in this region using 18S ribosomal RNA gene amplicon sequencing...
April 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29677743/mechanical-and-thermal-insulation-properties-of-porous-silica-polyurethane-composites
#12
Chunyuan Liu, Younghwan Kwon
Porous hydroxyl-terminated polybutadiene-based polyurethane (HPU) composites containing various hollow glass microspheres (HGMs) up to 75 vol.% were synthesized by one-step bulk polyaddition-type polymerization. An unfilled (non-porous) HPU sample was also prepared as a reference. The thermal conductivity of the HPU/HGM composites, which are considered as a three-phasic material composed of a bulk HPU matrix, silicate thin layer, and pores, could be predicted perfectly by the Felske model. The thermal properties, such as Tg and thermal stability, of the HPU/HGM composites were affected slightly by the addition of HGMs compared to the unfilled HPU...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677713/incorporation-of-si-and-zr-into-pure-hfo%C3%A2-and-its-effects-on-dielectric-integrity
#13
Hyunki Kim, Pyungho Choi, Nayoung Lee, Soonkon Kim, Kwangjun Koo, Jaehyeong Lee, Byoungdeog Choi
Hafnium-silicate (HfSiO4, (HfO2)x(SiO2)1-x) and hafnium-zirconate (HfZrO4, (HfO2)x(ZrO2)1-x) films were employed as a gate dielectric to enhance the electrical properties of pure HfO2. (HfO2)x(SiO2)1-x and (HfO2)x(ZrO2)1-x films were formed onto p-Si substrates with varying degrees of Hf content x (x = 1, 0.9, 0.7, and 0.5) via solution processing. With regard to (HfO2)x(SiO2)1-x, the leakage current decreased from 1.94 × 10-8 to 4.29 × 10-9 A/cm2 at a gate voltage of VG = -1 V when the HfO2 content was reduced...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677685/on-the-phylogenetic-position-of-the-genus-raphidocystis-haptista-centroplasthelida-with-notes-on-the-dimorphism-in-centrohelid-life-cycle
#14
Vasily V Zlatogursky, Daria Drachko, Vladimir I Klimov, Yegor Shishkin
Centrohelid heliozoan Raphidocystis glabra was reisolated for the first time after initial description and put into a clonal culture. Its correct identification was confirmed by scanning and transmission electron microscopy of scales. The first light microscopy data from the living cells were obtained. Phylogenetic analysis of its position using 18S rDNA sequences was also performed. This species branches inside of the Polyplacocystis clade, being closely related to the strain HLO4. The latter was isolated from the same sample with R...
April 5, 2018: European Journal of Protistology
https://www.readbyqxmd.com/read/29675525/the-effect-of-aluminum-and-platinum-additives-on-hydrogen-adsorption-on-mesoporous-silicates
#15
Gérôme Melaet, Vitalie Stavila, Lennie Klebanoff, Gabor A Somorjai
Recent theoretical predictions indicate that functional groups and additives could have a favorable impact on the hydrogen adsorption characteristics of sorbents; however, no definite evidence has been obtained to date and little is known about the impact of such modifications on the thermodynamics of hydrogen uptake and overall capacity. In this work, we investigate the effect of two types of additives on the cryoadsorption of hydrogen to mesoporous silica. First, Lewis and Brønsted acid sites were evaluated by grafting aluminum to the surface of mesoporous silica (MCF-17) and characterizing the resulting silicate materials' surface area and the concentration of Brønsted and Lewis acid sites created...
April 20, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29674824/effect-of-acid-etching-on-the-micro-shear-bond-strength-of-resin-composite-calcium-silicate-interface-evaluated-over-different-time-intervals-of-bond-aging
#16
Neha Sultana, Ruchika Roongta Nawal, Sarika Chaudhry, Malavika Sivakumar, Sangeeta Talwar
Introduction: With the introduction of calcium silicate materials, pulp capping procedure has been simplified due to their therapeutic pulp capping capabilities and ability to be used as a provisional bulk restorative material simultaneously. The quality of the adhesive bond between these cements and composite is of clinical significance with regard to the longevity of the final laminate restoration. Thus, this study aims to compare the in vitro microtensile bond strengths of resin composite to different calcium silicate cements versus glass ionomer cement (GIC)...
March 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29674292/the-influence-of-mineral-particles-on-fibroblast-behaviour-a-comparative-study
#17
Diosangeles Soto Veliz, Jens C Luoto, Ilari Pulli, Martti Toivakka
Minerals are versatile tools utilised to modify and control the physical-chemical and functional properties of substrates. Those properties include ones directing cell fate; thus, minerals can potentially provide a direct and inexpensive method to manipulate cell behaviour. This paper shows how different minerals influence human dermal fibroblast behaviour depending on their properties. Different calcium carbonates, calcium sulphates, silica, silicates, and titanium dioxide were characterised using TEM, ATR-FTIR, and zeta potential measurements...
April 10, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29672846/structure-based-optics-of-centric-diatom-frustules-modulation-of-the-in-vivo-light-field-for-efficient-diatom-photosynthesis
#18
Johannes W Goessling, Yanyan Su, Paulo Cartaxana, Christian Maibohm, Lars F Rickelt, Erik C L Trampe, Sandra L Walby, Daniel Wangpraseurt, Xia Wu, Marianne Ellegaard, Michael Kühl
The optical properties of diatom silicate frustules inspire photonics and nanotechnology research. Whether light interaction with the nano-structure of the frustule also affects diatom photosynthesis has remained unclear due to lack of information on frustule optical properties under more natural conditions. Here we demonstrate that the optical properties of the frustule valves in water affect light harvesting and photosynthesis in live cells of centric diatoms (Coscinodiscus granii). Microscale cellular mapping of photosynthesis around localized spot illumination demonstrated optical coupling of chloroplasts to the valve wall...
April 19, 2018: New Phytologist
https://www.readbyqxmd.com/read/29671800/preparation-of-water-suspensions-of-nanocalcite-for-cultural-heritage-applications
#19
Maria-Beatrice Coltelli, Dario Paolucci, Valter Castelvetro, Sabrina Bianchi, Elisabeth Mascha, Luca Panariello, Cecilia Pesce, Johannes Weber, Andrea Lazzeri
The consolidation of degraded carbonate stone used in ancient monuments is an important topic for European cultural heritage conservation. The products most frequently used as consolidants are based on tetraalkoxy- or alkylalkoxy-silanes (in particular tetraethyl-orthosilicate, TEOS), resulting in the formation of relatively stable amorphous silica or alkylated (hydrophobic) silica inside the stone pores. However, silica is not chemically compatible with carbonate stones; in this respect, nanocalcite may be a suitable alternative...
April 19, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29663326/contributions-of-depth-filter-components-to-protein-adsorption-in-protein-bioprocessing
#20
Ohnmar Khanal, Nripen Singh, Steven J Traylor, Xuankuo Xu, Sanchayita Ghose, Zheng Jian Li, Abraham M Lenhoff
Depth filtration is widely used in downstream bioprocessing to remove particulate contaminants via depth straining and is therefore applied to harvest clarification and other processing steps. However, depth filtration also removes proteins via adsorption, which can contribute variously to impurity clearance and to reduction in product yield. The adsorption may occur on the different components of the depth filter, i.e., filter aid, binder and cellulose filter. We measured adsorption of several model proteins and therapeutic proteins onto filter aids, cellulose and commercial depth filters at pH 5-8 and ionic strengths < 50 mM and correlated the adsorption data to bulk measured properties such as surface area, morphology, surface charge density and composition...
April 16, 2018: Biotechnology and Bioengineering
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