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https://www.readbyqxmd.com/read/28104341/water-level-fluctuations-influence-sediment-porewater-chemistry-and-methylmercury-production-in-a-flood-control-reservoir
#1
Chris S Eckley, Todd P Luxton, Jennifer Goetz, John McKernan
Reservoirs typically have elevated fish mercury (Hg) levels compared to natural lakes and rivers. A unique feature of reservoirs is water-level management which can result in sediment exposure to the air. The objective of this study is to identify how reservoir water-level fluctuations impact Hg cycling, particularly the formation of the more toxic and bioaccumulative methylmercury (MeHg). Total-Hg (THg), MeHg, stable isotope methylation rates and several ancillary parameters were measured in reservoir sediments (including some in porewater and overlying water) that are seasonally and permanently inundated...
January 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28100813/coral-calcifying-fluid-ph-is-modulated-by-seawater-carbonate-chemistry-not-solely-seawater-ph
#2
S Comeau, E Tambutté, R C Carpenter, P J Edmunds, N R Evensen, D Allemand, C Ferrier-Pagès, S Tambutté, A A Venn
Reef coral calcification depends on regulation of pH in the internal calcifying fluid (CF) in which the coral skeleton forms. However, little is known about calcifying fluid pH (pHCF) regulation, despite its importance in determining the response of corals to ocean acidification. Here, we investigate pHCF in the coral Stylophora pistillata in seawater maintained at constant pH with manipulated carbonate chemistry to alter dissolved inorganic carbon (DIC) concentration, and therefore total alkalinity (AT). We also investigate the intracellular pH of calcifying cells, photosynthesis, respiration and calcification rates under the same conditions...
January 25, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28091658/insights-into-the-formation-of-inorganic-heterocycles-via-cyclocondensation-of-primary-amines-with-group-15-and-16-halides
#3
Tristram Chivers, Risto S Laitinen
Cyclocondensation is a major preparative route for the generation of inorganic heterocycles especially in the case of ring systems involving a Group 15 or 16 element linked to nitrogen. This Perspective will consider recent experimental and computational studies involving the reactions of primary amines (or their synthetic equivalents) with pnictogen and chalcogen halides. The major focus will be a discussion of the identity and role of acyclic intermediates in the reaction pathways to ring formation, as well as the nature of the heterocycles so formed...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28088667/cell-laden-hydrogels-for-osteochondral-and-cartilage-tissue-engineering
#4
REVIEW
Jingzhou Yang, Yu Shrike Zhang, Kan Yue, Ali Khademhosseini
: Despite tremendous advances in the field of regenerative medicine, it still remains challenging to repair the osteochondral interface and full-thickness articular cartilage defects. This inefficiency largely originates from the lack of appropriate tissue engineered artificial matrices that can replace the damaged regions and promote tissue regeneration. Hydrogels are emerging as a promising class of biomaterials for both soft and hard tissue regeneration. Many critical properties of hydrogels, such as mechanical stiffness, elasticity, water content, bioactivity, and degradation, can be rationally designed and conveniently tuned by proper selection of the material and chemistry...
January 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28068474/chemoselective-hydrodehalogenation-of-organic-halides-utilizing-two-dimensional-anionic-electrons-of-inorganic-electride-ca2n-%C3%A2-e
#5
Ye Ji Kim, Sun Min Kim, Chunghyeon Yu, Youngmin You, Eun Jin Cho, Jung Woon Yang, Sung Wng Kim
Halogenated organic compounds (HOCs) are important man-made chemicals widely used in chemical industry, biology and pharmacology; however, the persistence and inertness of organic halides cause human health problems and considerable environmental pollution. Thus, the elimination of halogen atoms from organic halides has been considered a central task in synthetic chemistry. In dehalogenation reactions, the inorganic bases remove halogen atoms, forming leaving groups and carbanions. Though the stable formation of free carbanion is the most decisive factor in determining the pathway and efficiency of reactions, the importance of carbanion stability in dehalogenation has long been overlooked...
January 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28060486/highly-porous-rigid-rod-polyamide-aerogels-with-superior-mechanical-properties-and-unusually-high-thermal-conductivity
#6
Jarrod C Williams, Baochau N Nguyen, Linda McCorkle, Daniel Scheiman, Justin S Griffin, Stephen A Steiner, Mary Ann B Meador
We report here the fabrication of polyamide aerogels composed of poly-p-phenylene-terephthalamide, the same backbone chemistry as DuPont's Kevlar. The all-para-substituted polymers gel without the use of cross-linker and maintain their shape during processing-an improvement over the meta-substituted cross-linked polyamide aerogels reported previously. Solutions containing calcium chloride (CaCl2) and para-phenylenediamine (pPDA) in N-methylpyrrolidinone (NMP) at low temperature are reacted with terephthaloyl chloride (TPC)...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28044210/cobalt-complexes-as-internal-standards-for-capillary-zone-electrophoresis-mass-spectrometry-studies-in-biological-inorganic-chemistry
#7
Hannah U Holtkamp, Stuart J Morrow, Mario Kubanik, Christian G Hartinger
Run-by-run variations are very common in capillary electrophoretic (CE) separations and cause imprecision in both the migration times and the peak areas. This makes peak and kinetic trend identification difficult and error prone. With the aim to identify suitable standards for CE separations which are compatible with the common detectors UV, ESI-MS, and ICP-MS, the Co(III) complexes [Co(en)3]Cl3, [Co(acac)3] and K[Co(EDTA)] were evaluated as internal standards in the reaction of the anticancer drug cisplatin and guanosine 5'-monophosphate as an example of a classical biological inorganic chemistry experiment...
January 2, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28043141/editorial-inorganic-chemistry-at-55
#8
William B Tolman
No abstract text is available yet for this article.
January 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28032507/acetalated-dextran-a-tunable-and-acid-labile-biopolymer-with-facile-synthesis-and-a-range-of-applications
#9
Eric M Bachelder, Erica N Pino, Kristy M Ainslie
Acetalated dextran (Ac-DEX) is a tunable acid-labile biopolymer with facile synthesis, aptly designed for the formulation of microparticles for vaccines and immune modulation. Tunability of degradation is achieved based on the kinetics of reaction and the molecular weight of the parent dextran polymer. This tunability translated to differential rates of activation of CD8+ T cells in an in vitro ovalbumin model and illustrated that acid-labile polymer can activate CD8+ T cells at an increased rate compared to acid-insensitive polymers...
December 29, 2016: Chemical Reviews
https://www.readbyqxmd.com/read/28018300/viral-lysis-of-photosynthesizing-microbes-as-a-mechanism-for-calcium-carbonate-nucleation-in-seawater
#10
John T Lisle, Lisa L Robbins
Removal of carbon through the precipitation and burial of calcium carbonate in marine sediments constitutes over 70% of the total carbon on Earth and is partitioned between coastal and pelagic zones. The precipitation of authigenic calcium carbonate in seawater, however, has been hotly debated because despite being in a supersaturated state, there is an absence of persistent precipitation. One of the explanations for this paradox is the geochemical conditions in seawater cannot overcome the activation energy barrier for the first step in any precipitation reaction; nucleation...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28011026/experimental-modeling-of-thaw-lake-water-evolution-in-discontinuous-permafrost-zone-role-of-peat-lichen-leaching-and-ground-fire
#11
Rinat M Manasypov, Liudmila S Shirokova, Oleg S Pokrovsky
Thaw of frozen peat in discontinuous permafrost zone produces a significant number of thermokarst lakes, which are known to contribute to Green House Gases (GHG) emission in the atmosphere. In palsa peatland of western Siberia, the thermokarst lake formation includes soil subsidences, lichen submergence and peat abrasion, leading to lateral spreading of the lake border, often intensified by ground fires. Mesocosm experiments were conducted during 3weeks on two thermokarst lake waters interacting in 30-L tanks with surface horizon of peat, the dominant ground vegetation (lichen Cladonia sp...
December 20, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27997119/anisotropic-self-assembly-of-hairy-inorganic-nanoparticles
#12
Chenglin Yi, Shaoyi Zhang, Kyle Thomas Webb, Zhihong Nie
Current interest in functional assemblies of inorganic nanoparticles (NPs) stems from their collective properties and diverse applications ranging from nanomedicines to optically active metamaterials. Coating the surface of NPs with polymers allows for tailoring of the interactions between NPs to assemble them into hybrid nanocomposites with targeted architectures. This class of building blocks is termed "hairy" inorganic NPs (HINPs). Regiospecific attachment of polymers has been used to achieve directional interactions for HINP assembly...
December 20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27993000/nanoarchitectures-for-metal-organic-framework-derived-nanoporous-carbons-toward-supercapacitor-applications
#13
Rahul R Salunkhe, Yusuf Valentino Kaneti, Jeonghun Kim, Jung Ho Kim, Yusuke Yamauchi
The future advances of supercapacitors depend on the development of novel carbon materials with optimized porous structures, high surface area, high conductivity, and high electrochemical stability. Traditionally, nanoporous carbons (NPCs) have been prepared by a variety of methods, such as templated synthesis, carbonization of polymer precursors, physical and chemical activation, etc. Inorganic solid materials such as mesoporous silica and zeolites have been successfully utilized as templates to prepare NPCs...
December 20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27990537/engineering-the-surface-chemistry-of-lead-chalcogenide-nanocrystal-solids-to-enhance-carrier-mobility-and-lifetime-in-optoelectronic-devices
#14
S J Oh, D B Straus, T Zhao, J-H Choi, S-W Lee, E A Gaulding, C B Murray, C R Kagan
We introduce a stepwise, hybrid ligand-exchange method for lead chalcogenide nanocrystal (NC) thin films using the compact-inorganic ligand thiocyanate and the short organic ligand benzenediothiolate. Spectroscopic and device measurements show that hybrid exchange enhances both carrier mobility and lifetime in NC thin films. The increased mobility-lifetime product achieved by this method enables demonstration of optoelectronic devices with enhanced power conversion and quantum efficiency.
December 19, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27981945/nanoscale-silicon-substrate-patterns-from-self-assembly-of-cylinder-forming-poly-styrene-block-poly-dimethylsiloxane-block-copolymer-on-silane-functionalized-surfaces
#15
Dipu Borah, Cian Cummins, Sozaraj Rasappa, Scott M D Watson, Andrew R Pike, Benjamin R Horrocks, David A Fulton, Andrew Houlton, George Liontos, Konstantinos Ntetsikas, Apostolos Avgeropoulos, Michael A Morris
Poly(styrene)-block-poly(dimethylsiloxane) (PS-b-PDMS) is an excellent block copolymer (BCP) system for self-assembly and inorganic template fabrication because of its high Flory-Huggins parameter (χ ∼ 0.26) at room temperature in comparison to other BCPs, and high selective etch contrast between PS and PDMS block for nanopatterning. In this work, self-assembly in PS-b-PDMS BCP is achieved by combining hydroxyl-terminated poly(dimethylsiloxane) (PDMS-OH) brush surfaces with solvent vapor annealing. As an alternative to standard brush chemistry, we report a simple method based on the use of surfaces functionalized with silane-based self-assembled monolayers (SAMs)...
January 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27924996/n-heterocyclic-carbene-or-phosphorus-ylide-which-one-forms-a-stronger-bond-with-group-11-metals-a-theoretical-study
#16
Mehdi Bayat, Asieh Sedghi, Leila Ebrahimkhani, Seyyed Javad Sabounchei
N-Heterocyclic carbene and phosphorus ylides are inorganic and organometallic ligands, and their coordination chemistry with transition elements, particularly group 11 metals, would be noticeable. This study seeks to characterize the structure and nature of the C→M bond of group 11 metals (M = Cu(i), Ag(i), Au(i)) in coordination with different monodentate phosphorus ylides {P(Ph)3CHR} and N-heterocyclic carbenes (NHC(R)) (where R = F, Cl, Br, CF3, CH3, H, C(CH3)3, Si(CH3)3, SiH3, Ph). In this regard, DFT calculations with the PBE/def2-TZVP level of theory were applied...
December 20, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27914859/fine-and-ultrafine-atmospheric-particulate-matter-at-a-multi-influenced-urban-site-physicochemical-characterization-mutagenicity-and-cytotoxicity
#17
Yann Landkocz, Frédéric Ledoux, Véronique André, Fabrice Cazier, Paul Genevray, Dorothée Dewaele, Perrine J Martin, Capucine Lepers, Anthony Verdin, Lucie Courcot, Saâd Boushina, François Sichel, Maurizio Gualtieri, Pirouz Shirali, Dominique Courcot, Sylvain Billet
Particulate Matter (PM) air pollution is one of the major concerns for environment and health. Understanding the heterogeneity and complexity of fine and ultrafine PM is a fundamental issue notably for the assessment of PM toxicological effects. The aim of this study was to evaluate mutagenicity and cytotoxicity of a multi-influenced urban site PM, with or without the ultrafine fraction. For this purpose, PM2.5-0.3 (PM with aerodynamic diameter ranging from 0.3 to 2.5 μm) and PM2.5 were collected in Dunkerque, a French coastal industrial city and were extensively characterized for their physico-chemical properties, including inorganic and organic species...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27913023/in-stream-metabolism-and-atmospheric-carbon-sequestration-in-a-groundwater-fed-karst-stream
#18
Junbing Pu, Jianhong Li, Mitra B Khadka, Jonathan B Martin, Tao Zhang, Shi Yu, Daoxian Yuan
Atmospheric carbon sequestered in karst systems through dissolution of carbonate minerals is considered to have no net effect on long-term regional and global carbon budgets because precipitation of dissolved carbonate minerals emits CO2 back to the atmosphere. Even though recent studies have implied that rapid kinetics of carbonate dissolution coupled with the aquatic photosynthetic uptake of dissolve inorganic carbon (DIC) could facilitate a stable atmospheric C sink in karst rivers and streams, little is known about the magnitudes and long-term stability of this C sink...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27910846/industrial-inorganic-chemistry-by-mark-anthony-benvenuto-de-gruyter-2015-paperback-xiii%C3%A2-%C3%A2-197-pages-isbn-978-3-11-033032-8-price-eur-69-95-usd-98-00-gbp-52-99
#19
Patrice Berthod
No abstract text is available yet for this article.
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27905166/50-and-more-years-of-propellane-chemistry-from-a-chemical-curiosity-to-explosive-applications-in-material-sciences-and-natural-product-chemistry
#20
Alicia Merve Dilmac, Eduard Spuling, Armin de Meijere, Stefan Bräse
Propellanes are a unique class of compounds with well over 10000 members with an inverted tetrahedral configuration featuring a weak single bond between two carbon atoms linked by three additional bridge. Not only structurally interesting, these propella-type compounds exhibit unusual reactivities. In this review, we highlight their synthesis and applications in material sciences, natural product chemistry and medicinal chemistry. We feature the chemistry of [1.1.1]propellane like the synthesis of oligomeric and polymeric structures derived from it such as bicyclo[1...
November 30, 2016: Angewandte Chemie
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