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https://www.readbyqxmd.com/read/28632318/-the-easier-the-better-preparation-of-efficient-photocatalysts-metastable-poly-heptazine-imide-salts
#1
Zupeng Chen, Aleksandr Savateev, Sergey Pronkin, Vasiliki Papaefthimiou, Christian Wolff, Marc Georg Willinger, Elena Willinger, Dieter Neher, Markus Antonietti, Dariya Dontsova
Cost-efficient, visible-light-driven hydrogen production from water is an attractive potential source of clean, sustainable fuel. Here, it is shown that thermal solid state reactions of traditional carbon nitride precursors (cyanamide, melamine) with NaCl, KCl, or CsCl are a cheap and straightforward way to prepare poly(heptazine imide) alkali metal salts, whose thermodynamic stability decreases upon the increase of the metal atom size. The chemical structure of the prepared salts is confirmed by the results of X-ray photoelectron and infrared spectroscopies, powder X-ray diffraction and electron microscopy studies, and, in the case of sodium poly(heptazine imide), additionally by atomic pair distribution function analysis and 2D powder X-ray diffraction pattern simulations...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631930/fluorescent-and-electrochemical-supramolecular-coordination-polymer-hydrogels-formed-from-ion-tuned-self-assembly-of-small-bis-terpyridine-monomer
#2
Xudong Yu, Zengyao Wang, Yajuan Li, Lijun Geng, Jujie Ren, Guoliang Feng
Herein, ditopic ligand DTA comprised of terpyridine and acetylene segments with only one aromatic π-conjugated building block was designed and synthesized. Driven by metal-ligand coordination interactions, we presented that the use of metal salts can direct the self-assembly of DTA in the generation of fluorescent and electrochemical polymers that entrapped water to form ambidextrous hydrogels. These were characterized by several approaches including fluorescent titrations, UV-vis, circular dichroism, and X-ray diffraction spectra as well as scanning electron microscopy and transmission electron microscopy experiments...
June 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28631806/increasing-oil-concentration-affects-consumer-perception-and-physical-properties-of-mayonnaise-type-spreads-containing-kcl
#3
Damir Dennis Torrico, Witoon Prinyawiwatkul
Reducing sodium intakes remains a global challenge for the food industry. KCl is a potential salt substitute but imparts bitterness when used at high concentrations. Little is known about how oil concentrations (OC) affect consumers' perception of saltiness and bitterness in emulsion products such as mayonnaise containing KCl. We evaluated consumers' perception and physical properties of mayonnaise-type spreads at various oil and tastant (NaCl or KCl) concentrations. Consumers (N = 306) evaluated saltiness, bitterness, overall taste liking (OTL) and purchase intent (PI)...
June 20, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28631388/the-efficacy-of-commercial-tooth-storage-media-for-maintaining-the-viability-of-human-periodontal-ligament-fibroblasts
#4
W Lee, S Stover, M Rasoulianboroujeni, K Sherman, F Fahimipour, E Dashtimoghadam, C Zito, H Jazayeri, L Tayebi
AIM: To evaluate Save-A-Tooth (SAT), EMT Toothsaver (EMT), and Hank's Balanced Salt Solution (HBSS) for their influence on the viability and proliferative capacity of human periodontal ligament fibroblast (HPDLF). METHODOLOGY: Primary HPDLFs were seeded on 96-well cell culture plates and exposed to SAT, EMT, HBSS and water (negative control) for 0.5, 1, 3, 6, 12 and 24 hours at room temperature (22°C). After each exposure time, cell viability was measured by quantifying adenosine triphosphate (ATP) using a luminescent dye...
June 20, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28630346/the-role-of-jet-and-film-drops-in-controlling-the-mixing-state-of-submicron-sea-spray-aerosol-particles
#5
Xiaofei Wang, Grant B Deane, Kathryn A Moore, Olivia S Ryder, M Dale Stokes, Charlotte M Beall, Douglas B Collins, Mitchell V Santander, Susannah M Burrows, Camille M Sultana, Kimberly A Prather
The oceans represent a significant global source of atmospheric aerosols. Sea spray aerosol (SSA) particles comprise sea salts and organic species in varying proportions. In addition to size, the overall composition of SSA particles determines how effectively they can form cloud droplets and ice crystals. Thus, understanding the factors controlling SSA composition is critical to predicting aerosol impacts on clouds and climate. It is often assumed that submicrometer SSAs are mainly formed by film drops produced from bursting bubble-cap films, which become enriched with hydrophobic organic species contained within the sea surface microlayer...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629324/residual-transpiration-as-a-component-of-salinity-stress-tolerance-mechanism-a-case-study-for-barley
#6
Md Hasanuzzaman, Noel W Davies, Lana Shabala, Meixue Zhou, Tim J Brodribb, Sergey Shabala
BACKGROUND: While most water loss from leaf surfaces occurs via stomata, part of this loss also occurs through the leaf cuticle, even when the stomata are fully closed. This component, termed residual transpiration, dominates during the night and also becomes critical under stress conditions such as drought or salinity. Reducing residual transpiration might therefore be a potentially useful mechanism for improving plant performance when water availability is reduced (e.g. under saline or drought stress conditions)...
June 19, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28628880/forward-osmosis-for-oily-wastewater-reclamation-multi-charged-oxalic-acid-complexes-as-draw-solutes
#7
Qingchun Ge, Gary Lee Amy, Tai-Shung Chung
Forward osmosis (FO) has demonstrated its merits in hybrid FO seawater desalination. However, FO may have a potential for other applications if suitable draw solutes are available. In this study, a series of novel draw solutes based on oxalic acid (OA)-transitional metal complexes are presented. Influential factors of FO performance have been systematically investigated by varying the transitional metals, cations of the complex draw solutes as well as the experimental conditions. Compared to NaCl and other recently synthesized draw solutes, the OA complexes show superior FO performance in terms of high water fluxes up to 27...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28628206/water-medium-synthesis-of-nucleoside-5-polyphosphates
#8
Anaïs Depaix, Suzanne Peyrottes, Béatrice Roy
This unit describes a one-pot, two step synthesis of ribonucleoside 5'-di- and 5'-triphosphates, as well as their purification. The first step of the synthesis involves the activation of an unprotected ribonucleoside 5'-monophosphate with 2-chloro-1,3-dimethylimidazolinium hexafluorophosphate and imidazole, in a mixture of water/acetonitrile. The resulting phosphorimidazolate intermediate is then treated with inorganic phosphate or pyrophosphate to afford the corresponding nucleoside 5'-di- or 5'-triphosphates...
June 19, 2017: Current Protocols in Nucleic Acid Chemistry
https://www.readbyqxmd.com/read/28627573/surface-specific-vibrational-spectroscopy-of-the-water-silica-interface-screening-and-interference
#9
Jan Schaefer, Grazia Gonella, Mischa Bonn, Ellen H G Backus
Surface-specific vibrational sum-frequency generation spectroscopy (V-SFG) is frequently used to obtain information about the molecular structure at charged interfaces. Here, we provide experimental evidence that not only screening of surface charges but also interference limits the extent to which V-SFG probes interfacial water at sub-mM salt concentrations. As a consequence, V-SFG yields information about the ∼single monolayer interfacial region not only at very high ionic strength, where the surface charge is effectively screened, but also for pure water due to the particularly large screening length at this low ionic strength...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28627540/mixing-scheme-of-an-aqueous-solution-of-tetrabutylphosphonium-trifluoroacetate-in-the-water-rich-region
#10
Ayako Nitta, Takeshi Morita, Keiko Nishikawa, Yoshikata Koga
We have studied the mixing scheme of an aqueous solution of ionic liquid tetrabutylphosphonium trifluoroacetate, [P4,4,4,4]CF3COO, in the water-rich region. The mixture shows phase separation with a lower critical solution temperature. To learn how the solute [P4,4,4,4]CF3COO species interact with each other in the dilute region, the third derivative quantities of Gibbs energy in terms of enthalpy, H, and volume, V, are evaluated. In the present study using up to the third derivative quantities, we conclude that [P4,4,4,4]CF3COO turns out to be an extremely strong hydrophobe...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28626940/overexpression-of-hevea-brasiliensis-ethylene-response-factor-hberf-ixc5-enhances-growth-tolerance-to-abiotic-stress-and-affects-laticifer-differentiation
#11
Retno Lestari, Maryannick Rio, Florence Martin, Julie Leclercq, Natthakorn Woraathasin, Sandrine Roques, Florence Dessailly, Anne Clément-Vidal, Christine Sanier, Denis Fabre, Sémi Melliti, Sony Suharsono, Pascal Montoro
Ethylene response factor 1 (ERF1) is an essential integrator of the jasmonate and ethylene signalling pathways coordinating a large number of genes involved in plant defences. Its orthologue in Hevea brasiliensis, HbERF-IXc5, has been assumed to play a major role in laticifer metabolism and tolerance to harvesting stress for better latex production. This paper set out to establish and characterize rubber transgenic lines overexpressing HbERF-IXc5. Overexpression of HbERF-IXc5 dramatically enhanced plant growth and enabled plants to maintain some ecophysiological parameters in response to abiotic stress such as water deficit, cold and salt treatments...
June 19, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28626299/neutron-radiography-measurement-of-salt-solution-absorption-in-mortar
#12
Catherine L Lucero, Robert P Spragg, Dale P Bentz, Daniel S Hussey, David L Jacobson, W Jason Weiss
Some concrete pavements in the US have recently exhibited premature joint deterioration. It is hypothesized that one component of this damage can be attributed to a reaction that occurs when salt-laden water is absorbed in the concrete and reacts with the matrix. This study examines the absorption of CaCl2 solution in mortar via neutron imaging. Mortar specimens were prepared with water to cement ratios, (w/c), of 0.36, 0.42 and 0.50 by mass and exposed to chloride solutions with concentrations ranging from 0 % to 29...
January 1, 2017: ACI Mater J
https://www.readbyqxmd.com/read/28625727/incomplete-loading-of-sls-and-fassif-micelles-within-the-diffusion-layers-of-dispersed-drug-particles-during-dissolution
#13
Kendra Galipeau, Michael Socki, Adam Socia, Paul A Harmon
Poorly water soluble drug candidates have been common in developmental pipelines over the last several decades. This has fueled considerable research around understanding how bile salt and model micelles can improve drug particle dissolution rates and human drug exposure levels. However, in the pharmaceutical context only a single mechanism of how micelles load solute has been assumed, that being the direct loading mechanism put forth by Cussler(1) 40 years ago. In this model micelles load at the particle surface and will be loaded to their equilibrium loading values...
June 15, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28623829/criteria-for-assessing-the-ecological-risk-of-nonylphenol-for-aquatic-life-in-chinese-surface-fresh-water
#14
Liangmao Zhang, Caidi Wei, Hui Zhang, Mingwei Song
The typical environmental endocrine disruptor nonylphenol is becoming an increasingly common pollutant in both fresh and salt water; it compromises the growth and development of many aquatic organisms. As yet, water quality criteria with respect to nonylphenol pollution have not been established in China. Here, the predicted "no effect concentration" of nonylphenol was derived from an analysis of species sensitivity distribution covering a range of species mainly native to China, as a means of quantifying the ecological risk of nonylphenol in surface fresh water...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28623795/transport-of-road-salt-contamination-in-karst-aquifers-and-soils-over-multiple-timescales
#15
Heather K Robinson, Elizabeth A Hasenmueller
Road deicing has caused widespread environmental Na(+) and Cl(-) release for decades, yet the transport and retention of these contaminants in karst aquifers and soils are poorly understood. We examined the transport dynamics of Na(+) and Cl(-) from road salt in shallow groundwater during flooding and over seasonal timescales by intensively monitoring an urban and a rural karst spring over approximately 2 years. Furthermore, we used a 20-year dataset for the rural spring to determine how salt retention affected long-term geochemical trends in the shallow groundwater...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28622989/rare-earth-elements-mobility-processes-in-an-amd-affected-estuary-huelva-estuary-sw-spain
#16
K L Lecomte, A M Sarmiento, J Borrego, J M Nieto
Huelva Estuary is a transition zone where REE-rich acidic waters interact with saline-alkaline seawater. This mixing process influences the geochemical and mineralogical characteristics of particulate and dissolved fractions. The Tinto River has >11,000μgL(-1) dissolved REE (pH=1.66), whereas seawater only reaches 8.75·10(-2)μgL(-1) dissolved REE (pH=7.87). REE-normalized patterns in "pH<6 solutions" are parallel and show similarities, diminishing their concentration as pH increases. Sequential extraction performed on the generated precipitates of mixed solutions indicates that most REE are associated to the residual phase...
June 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28622726/efficient-covalent-modification-of-multiwalled-carbon-nanotubes-with-diazotized-dyes-in-water-at-room-temperature
#17
Asma Bensghaïer, Stephanie Lau-Truong, Mahamadou Seydou, Aazdine Lamouri, Eric Leroy, Matej Micusik, Klaudia Forro, Mohamed Beji, Jean Pinson, Maria Omastova, Mohamed Mehdi Chehimi
Tetrafluoroborate salts of diazotized Azure A (AA-N2+), Neutral Red (NR-N2+) and Congo Red (CR-N2+) dyes were prepared and reacted with multiwalled carbon nanotubes (MWCNTs) at room temperature, in water without any reducing agent. The as-modified MWCNTs were examined by IRATR, Raman spectroscopy, XPS, TGA, TEM and cyclic voltammetry. The diazonium band located at 2350 cm-1 in the diazotized dye IR spectra vanished after attachment to the nanotubes whilst Raman D/G peak ratio slightly increased after dye covalent attachment at high initial diazonium/CNT mass ratio...
June 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28621540/accurate-prediction-of-the-hydration-free-energies-of-20-salts-through-adaptive-force-matching-and-the-proper-comparison-with-experimental-references
#18
Jicun Li, Feng Wang
Simple pair-wise potentials for five alkali ions and four halide ions were developed by only fitting to ab initio MP2 forces with the adaptive force matching (AFM) method. Without fitting to any experimental information, the AFM models predict the hydration free energies of all 10 fluoride and chloride salts formed by these ions within 1.5% of experimental reference. The predicted hydration free energies for the 10 bromide and iodide salts are within 5-6% of experimental references with the larger error likely due to the neglect of explicit treatment of polarization and charge transfer...
June 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28621406/2d-frameworks-self-assembled-from-a-hydrazone-ligand-and-azide-salts-synthesis-structures-and-luminescent-property
#19
Peng Wang, Yu-Shan Wu, Xiao-Meng Han, Shan-Shan Zhao, Jie Qin
Three metal-organic coordination polymers [Cu(L)(N3)]·(H2O)0.25n (1), [Zn(L)(N3)]·(H2O)0.5n (2) and [Cd2(L)2(N3)2(H2O)]n (3) have been synthesized from hydrazone ligand N'-(1-(pyrazin-2-yl)ethylidene)isonicotinohydrazide (HL), NaN3 and corresponding metal nitrates. Complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. All three complexes feature 2D coordination network in which L1- acts as NNON tetradentate ligand and azide acts as end-on bridging ligand...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621399/-mii-ncs-2-nia-2-oh2-2-preparation-crystal-structure-and-thermal-properties-mii-mn-fe-nia-nicotinamide
#20
Marta Počkaj, Nives Kitanovski, Boris Čeh, Romana Cerc-Korošec
Two novel isostructural coordination compounds of manganese(II) (1) and iron(II) (2) with common formulae [MII(NCS)2(nia)2(OH2)2] have been prepared from water solution of appropriate metal salt, nicotinamide and KSCN. Their crystal structures were determined by means of X-ray diffraction on single crystals. The mononuclear title compounds crystallize in a triclinic P-1 space group with six monodentate octahedrally arranged ligands around the metal centre. The coordination molecules are self-assembled with an extended network of hydrogen bonds into a three-dimensional structure...
June 2017: Acta Chimica Slovenica
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