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https://www.readbyqxmd.com/read/29774348/a-new-series-of-co-ni-zn-and-cd-metal-organic-architectures-driven-by-an-unsymmetrical-biphenyl-tricarboxylic-acid-hydrothermal-assembly-structural-features-and-properties
#1
Jin-Zhong Gu, Yan Cai, Zi-Yue Qian, Min Wen, Zi-Fa Shi, Dong-Yu Lv, Alexander M Kirillov
This study reports the hydrothermal synthesis of a novel series of twelve coordination compounds, namely, {[Cd(μ-Hnbtc)(H2O)4]·H2O}n (1), [Zn2(μ-Hnbtc)2(phen)2]·2H2O (2), [Zn(Hnbtc)(phen)2(H2O)]·4.5H2O (3), [Ni(Hnbtc)(phen)2(H2O)]·6H2O (4), [Zn2(μ-Hnbtc)2(2,2'-bipy)2]·2H2O (5), [Cd3(μ5-nbtc)(μ6-nbtc)(2,2'-bipy)2(H2O)]n (6), {[Zn3(μ3-nbtc)2(phen)3(H2O)2]·4H2O} (7), [Co(H2O)6][Co2(nbtc)2(μ-4,4'-bipy)(4,4'-bipy)2(H2O)6]·8H2O (8), {[Ni3(μ4-nbtc)2(μ-4,4'-bipy)2.5(μ-H2O)(H2O)3]·4H2O}n (9), {[Cd2(μ4-nbtc)(μ-OH)(2,2'-bipy)2]·H2O}n (10), [Cd2(μ4-nbtc)(μ-OH)(phen)2(H2O)]n (11), and {[Zn2(μ5-nbtc)(μ3-OH)(μ-4,4'-bipy)]·4,4'-bipy·H2O}n (12), which are derived from 3'-nitro-biphenyl-2,4,4'-tricarboxylic acid (H3nbtc) as a virtually unexplored building block...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29772415/highly-efficient-polymer-supported-monodisperse-ruthenium-nickel-nanocomposites-for-dehydrocoupling-of-dimethylamine-borane
#2
Betul Sen, Esra Kuyuldar, Buse Demirkan, Tugba Onal Okyay, Aysun Şavk, Fatih Sen
In the present study, highly effective and reusable monodisperse ruthenium-nickel (Ru-Ni) nanomaterials supported on poly(N-vinyl-2-pyrrolidone) (Ru-Ni@PVP) were synthesized (3.51 ± 0.38 nm) by a facile sodium-hydroxide-assisted reduction method; Ru and Ni reduction in PVP solution was accomplished. The prepared nanocomposites were characterized by TEM, HRTEM, XRD, and XPS and performed as a catalyst for dehydrocoupling of dimethylamine-borane (DMAB). It was found that Ru-Ni nanomaterials are one of the most active catalysts at low concentrations and temperature for dehydrocoupling of DMAB...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29771538/synthesis-of-transparent-aqueous-zro2-nanodispersion-without-modification-for-high-refractive-index-nanocomposite-film
#3
Yi Xia, Cong Zhang, Jiexin Wang, Dan Wang, Xiaofei Zeng, Jian-Feng Chen
The controllable synthesis of metal oxide nanoparticles is of fundamental and technological interest. In this article, highly transparent aqueous nanodispersion of ZrO2 with controllable crystalline phase, high concentration and long-term stability was facilely prepared without any modification via the reaction of inexpensive inorganic zirconium salt and sodium hydroxide in water under an acid surrounding, combined with hydrothermal treatment. The as-prepared transparent nanodispersion had an average particle size of 7 nm, a high stability of 18 months and a high solid content of 35 wt...
May 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29764286/environmental-evaluation-of-flocculation-efficiency-in-the-separation-of-the-microalgal-biomass-of-scenedesmus-sp-cultivated-in-full-scale-photobioreactors
#4
Marisa D Scherer, Fernando J C Magalhães Filho, Amanda C Oliveira, Nelson F H Selesu, Cássia M L Ugaya, André B Mariano, José V C Vargas
In this paper the environmental evaluation of the separation process of the microalgal biomass Scenedesmus sp. from full-scale photobioreactors was carried out at the Research and Development Nucleus for Sustainable Energy (NPDEAS), with different flocculants (iron sulfate - FeCl3 , sodium hydroxide - NaOH, calcium hydroxide - Ca(OH)2 and aluminum sulphate Al2 (SO4 )3 , by means of the life cycle assessment (LCA) methodology, using the SimaPro 7.3 software. Furthermore, the flocculation efficiency by means of optical density (OD) was also evaluated...
May 15, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29762024/alkaline-hydrolysis-of-methyl-decanoate-in-surfactant-based-systems
#5
Marcel Schmidt, Johannes Deckwerth, Reinhard Schomaecker, Michael Schwarze
Surfactant modified reaction systems are one approach to perform organic reactions with water as the solvent involving hydrophobic reactants. Herein, the alkaline hydrolysis of the long chain methyl decanoate in cationic and nonionic surfactant modified systems is reported. The physicochemical behavior of the reaction mixture and the performance of the alkaline hydrolysis were systematically investigated. In water as the solvent, the reaction is slow, but at elevated temperatures, the alkaline hydrolysis of methyl decanoate is accelerated because the reaction product sodium decanoate acts as an ionic surfactant, leading to an increased solubility of methyl decanoate in the aqueous phase...
May 15, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29740770/characteristics-and-batch-experiments-of-acid-and-alkali-modified-corncob-biomass-for-nitrate-removal-from-aqueous-solution
#6
Xiaolan Hu, Yingwen Xue, Li Long, Kejing Zhang
In this study, modified biochar was adopted as an adsorbent for the nitrate removal in aqueous solutions. Raw material was impregnated in sulfuric acid (H2 SO4 , 1 mol/L) and sodium hydroxide (NaOH, 2 mol/L) separately and then prepared at 600 °C. After treated with acid, the BET specific surface area was much higher than that of unmodified and alkali-modified biochars. The low adsorption capacity and specific surface area of alkali-modified biochar may be due to the precipitate on the surface according to the results of XRD...
May 9, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29737370/method-development-and-validation-for-total-haloxyfop-analysis-in-infant-formulas-and-related-ingredient-matrices-using-liquid-chromatography-tandem-mass-spectrometry
#7
Urairat Koesukwiwat, Lukas Vaclavik, Katerina Mastovska
According to the European Commission directive 2006/141/EC, haloxyfop residue levels should not exceed 0.003 mg/kg in ready-to-feed infant formula, and the residue definition includes sum of haloxyfop, its esters, salts, and conjugates expressed as haloxyfop. A simple method for total haloxyfop analysis in infant formula and related ingredient matrices was developed and validated using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The sample preparation consisted of an alkaline hydrolysis with methanolic sodium hydroxide to release haloxyfop (parent acid) from its bound forms prior to the extraction with acetonitrile...
May 8, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29735085/evaluating-the-effects-of-the-adulterants-in-milk-using-direct-infusion-high-resolution-mass-spectrometry
#8
Tatiane Melina Guerreiro, Diogo Noin de Oliveira, Carlos Fernando Odir Rodrigues Melo, Estela de Oliveira Lima, Marta da Silva Ribeiro, Rodrigo Ramos Catharino
Milk is an extremely complex food, capable of providing essential nutrients as well as being an important source of energy, and high-quality proteins and fats. Due to advances in technology, and to meet the increasing demand, production costs have increased, turning milk into a target of adulterations. Routine methods usually applied to certify the quality of the milk are restricted to microbiological tests, and assays that attest the nutritional composition within the expected values. However, potentially harmful byproducts generated by adulterating substances in general are not detected through these methodologies...
June 2018: Food Research International
https://www.readbyqxmd.com/read/29733306/a-fast-silver-staining-protocol-enabling-simple-and-efficient-detection-of-ssr-markers-using-a-non-denaturing-polyacrylamide-gel
#9
Ling Huang, Xiaohui Deng, Ronghua Li, Yanshi Xia, Guihua Bai, Kadambot H M Siddique, Peiguo Guo
Simple Sequence Repeat (SSR) is one of the most effective markers used in plant and animal genetic research and molecular breeding programs. Silver staining is a widely used method for the detection of SSR markers in a polyacrylamide gel. However, conventional protocols for silver staining are technically demanding and time-consuming. Like many other biological laboratory techniques, silver staining protocols have been steadily optimized to improve detection efficiency. Here, we report a simplified silver staining method that significantly reduces reagent costs and enhances the detection resolution and picture clarity...
April 20, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29731448/epigallocatechin-gallate-inhibits-corneal-neovascularization-in-ratalkaline-burn-model
#10
Huiyan Li, Bei Ye, Lili Zhu, Lianqun Wu
To evaluate the effectiveness of epigallocatechin gallate (EGCG) in inhibiting corneal neovascularization in rat alkaline burn model. Corneal neovascularization model was induced by sodium hydroxide alkaline burn injury in SD rats. Rats were randomly divided into two groups and were given intraperitoneal injection with EGCG or PBS per day for up to 14 days respectively. Corneal inflammation and neovascularization area were assessed on days 3, 7, and 14 after cauterization with digital photographs. Vascular endothelial growth factor (VEGF) and pigment epithelium derived factor (PEDF) mRNA levels were measured by reverse transcription-polymerase chain reaction (qRT-PCR)...
May 2018: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29714705/potential-erosive-effect-of-mouthrinses-on-enamel-and-dentin
#11
Alex J Delgado, Anna Paula Dias Ribeiro, Alejandro Quesada, Luis E Rodríguez, Rosa Hernández, Bonita Wynkoop, Deborah A Dilbone
This in vitro study measured the pH values, titratable acidity (TA), and erosive potential of commercially available mouthrinses. A pH analysis of 6 mouthrinses (Listerine Total Care, Listerine Ultraclean, Listerine Original, Crest Pro-Health, Scope Classic, and ACT Total Care) was performed using a calibrated pH meter, and the neutralizable acidity was measured by titrating the mouthwashes against 0.1 M of sodium hydroxide. A gravimetric analysis was performed by submerging human enamel and dentin specimens in 5 mL of each mouthrinse for a total of 2 weeks...
May 2018: General Dentistry
https://www.readbyqxmd.com/read/29700747/towards-saving-freshwater-halophytes-as-unconventional-feedstuffs-in-livestock-feed-a-review
#12
Mohamed E Abd El-Hack, Dalia H Samak, Ahmed E Noreldin, Muhammad Arif, Hilal S Yaqoob, Ayman A Swelum
Water represents 71% of all earth area and about 97% of this water is salty water. So, only 3% of the overall world water quantity is freshwater. Human can benefit only from 1% of this water and the remaining 2% freeze at both poles of earth. Therefore, it is important to preserve the freshwater through increasing the plants consuming salty water. The future prosperity of feed resources in arid and semi-arid countries depends on economic use of alternative resources that have been marginalized for long periods of time, such as halophytic plants, which are one such potential future resource...
April 26, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29695179/extraction-of-the-same-novel-homoglycan-mixture-from-two-different-strains-of-bifidobacterium-animalis-and-three-strains-of-bifidobacterium-breve
#13
M Alhudhud, S Sadiq, H N Ngo, C Hidalgo-Cantabrana, P Ruas-Madiedo, D van Sinderen, P N Humphreys, A P Laws
Three strains of Bifidobacterium breve (JCM 7017, JCM 7019 and JCM 2258) and two strains of Bifidobacterium animalis subsp. lactis (AD011 and A1dOxR) were grown in broth cultures or on plates, and a standard exopolysaccharide extraction method was used in an attempt to recover exocellular polysaccharides. When the extracted materials were analysed by NMR it was clear that mixtures of polysaccharides were being isolated including exopolysaccharides (EPS) cell wall polysaccharides and intracellular polysaccharides...
April 26, 2018: Beneficial Microbes
https://www.readbyqxmd.com/read/29692831/comparison-of-residual-triple-antibiotic-paste-propolis-and-calcium-hydroxide-on-root-canal-walls-in-natural-open-apex-teeth-an-in-vitro-study
#14
Armita Rouhani, Mahbobe Erfanzadeh, Hamid Jafarzadeh, Elham Najafi
Introduction: Endodontic therapy is challenging in open apex teeth. One of these problems is the residue of medicaments on root canal walls. The aim of this study was to evaluate the amount of residual materials on canal walls after the use as medicaments within natural open apex teeth. Methods and Materials: A total of 45 human extracted single-rooted premolars with open apices were selected. After cutting off the crowns, root canals were gently instrumented using #40 files and irrigated with 0...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29690856/human-amniotic-membrane-with-aligned-electrospun-fiber-as-scaffold-for-aligned-tissue-regeneration
#15
Hanis Nazihah Hasmad, Mohd Reusmaazran Yusof, Zainul Rashid Mohd Razi, Ruszymah Binti Haji Idrus, Shiplu Roy Chowdhury
Fabrication of composite scaffolds is one of the strategies proposed to enhance the functionality of tissue engineered scaffolds for improved tissue regeneration. By combining multiple elements together, unique biomimetic scaffolds with desirable physical and mechanical properties can be tailored for tissue-specific applications. Despite having a highly porous structure, the utility of electrospun fibers (EF) as scaffold is usually hampered by their insufficient mechanical strength. In this study, we attempted to produce a mechanically competent scaffold with cell-guiding ability by fabricating aligned PLGA fibers on decellularized human amniotic membrane (HAM), known to possess favorable tensile and wound healing properties...
April 25, 2018: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/29689513/facile-and-green-synthesis-of-fluorescent-carbon-dots-with-tunable-emission-for-sensors-and-cells-imaging
#16
Haipeng Diao, Tingting Li, Rong Zhang, Yu Kang, Wen Liu, Yanhua Cui, Shuangyan Wei, Ning Wang, Lihong Li, Haojiang Wang, Weifen Niu, Tijian Sun
Most carbon dots (CDs) conventional fabrication approaches produce single colored fluorescent materials, different methods are required to synthesize distinct carbon dots for specific optical applications. Herein, using one-pot hydrothermal treatment of Syringa obtata Lindl, a facile, low-cost and green assay is achieved in the controllable synthesis of blue and green fluorescent carbon dots. The fluorescent emission of CDs can be well-tuned by adding sodium hydroxide in the precursor solution. Blue fluorescent CDs are applied to Fe3+ sensing with a low detection limit of 0...
April 17, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29680660/evaluation-of-a-self-regulated-in-vitro-hypoxic-system-by-using-chemical-reactions
#17
Ning Han, Zhaotao Wang, Guoqi Wang, Jun Yu, Chen Chen, Huiyong Huang, Ruxiang Xu
In this study, we established an in vitro hypoxic system driven by a self-regulated chemical reaction that proved effective for cell culture. The hypoxic device was modified from a 1.5 L polypropylene preservation box normally employed for food storage. Pyrogallic acid, sodium hydroxide, and sodium carbonate were dissolved in water and injected into the box. Sodium dihydrogen phosphate solution was injected into the box after 15 min. We measured the concentrations of oxygen and carbon dioxide in the box to determine viability of the hypoxic system...
April 19, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29680496/investigation-of-gel-formation-and-volatilization-of-acetate-acid-in-magnesium-acetate-droplets-by-the-optical-tweezers
#18
Xi-Juan Lv, Yang Wang, Chen Cai, Shu-Feng Pang, Jia-Bi Ma, Yun-Hong Zhang
Hygroscopicity and volatility of single magnesium acetate (MgAc2 ) aerosol particles at various relative humidities (RHs) are studied by a single-beam optical tweezers, and refractive indices (RIs) and morphology are characterized by cavity enhanced Raman spectroscopy. Gel formation and volatilization of acetate acid (HAc) in MgAc2 droplets are observed. Due to the formation of amorphous gel structure, water transposition in droplets at RH < 50% is significantly impeded on a time scale of 140,000 s...
April 14, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29674149/sorption-desorption-of-sb-iii-in-different-soils-kinetics-and-effects-of-the-selective-removal-of-hydroxides-organic-matter-and-humic-substances
#19
Jining Li, Hong Hou, Masaaki Hosomi
To examine the Sb(III) retention by three soils with different properties (Ferrosol, Primosol and Isohumosol), kinetic batch experiments were carried out for Sb(III) adsorption-desorption, followed by Sb release using a sequential extraction procedure. In addition, hydroxides, organic matter, and humic substances were selectively removed by washing the soil with oxalate, sodium dithionate-citrate-bicarbonate, H2 O2 , and NaOH. The effects of removing these substances on Sb(III) retention were investigated by comparing the Sb distribution coefficients and desorption rates...
April 13, 2018: Chemosphere
https://www.readbyqxmd.com/read/29670738/retreatment-of-failed-revascularization-revitalization-of-immature-permanent-tooth-a-case-report
#20
Radovan Žižka, Jiří Šedý, Iva Voborná
The aim of this article is to describe the clinical case of the non-surgical retreatment of a failed revascularization/revitalization treatment (RRT). The retreatment was preceded by two sessions including an interim medication with calcium hydroxide and a modified irrigation protocol containing a highly-concentrated sodium hypochlorite and prolonged usage of ethylenediaminetetraacetic acid (EDTA) to reverse unacceptable side effects of hypochlorite. During a 15- month follow-up, the healing of the periapical lesion, increased thickening of root canal walls and maturation of root was apparent...
February 2018: Journal of Clinical and Experimental Dentistry
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