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https://www.readbyqxmd.com/read/28107552/reflections-on-the-history-of-indoor-air-science-focusing-on-the-last-50-years
#1
Jan Sundell
The scientific articles and Indoor Air conference publications of the indoor air sciences (IAS) during the last 50 years are summarized. In total 7524 presentations, from 79 countries, have been made at Indoor Air conferences held between 1978 (49 presentations) and 2014 (1049 presentations). In the Web of Science 26,992 articles on indoor air research (with the word "indoor" as a search term) have been found (as of 1 Jan 2016) of which 70% were published during the last 10 years. The modern scientific history started in the 1970s with a question: "did indoor air pose a threat to health as did outdoor air?" Soon it was recognized that indoor air is more important, from a health point of view, than outdoor air...
January 20, 2017: Indoor Air
https://www.readbyqxmd.com/read/28106994/enzymatic-halogenation-and-dehalogenation-reactions-pervasive-and-mechanistically-diverse
#2
Vinayak Agarwal, Zachary D Miles, Jaclyn M Winter, Alessandra S Eustáquio, Abrahim A El Gamal, Bradley S Moore
Naturally produced halogenated compounds are ubiquitous across all domains of life where they perform a multitude of biological functions and adopt a diversity of chemical structures. Accordingly, a diverse collection of enzyme catalysts to install and remove halogens from organic scaffolds has evolved in nature. Accounting for the different chemical properties of the four halogen atoms (fluorine, chlorine, bromine, and iodine) and the diversity and chemical reactivity of their organic substrates, enzymes performing biosynthetic and degradative halogenation chemistry utilize numerous mechanistic strategies involving oxidation, reduction, and substitution...
January 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28106754/advances-in-solid-state-transformations-of-coordination-bonds-from-the-ball-mill-to-the-aging-chamber
#3
REVIEW
Cristina Mottillo, Tomislav Friščić
Controlling the formation of coordination bonds is pivotal to the development of a plethora of functional metal-organic materials, ranging from coordination polymers, metal-organic frameworks (MOFs) to metallodrugs. The interest in and commercialization of such materials has created a need for more efficient, environmentally-friendly routes for making coordination bonds. Solid-state coordination chemistry is a versatile greener alternative to conventional synthesis, offering quantitative yields, enhanced stoichiometric and topological selectivity, access to a wider range of precursors, as well as to molecules and materials not readily accessible in solution or solvothermally...
January 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106367/alignment-of-carbon-nanotubes-in-carbon-nanotube-fibers-through-nanoparticles-a-route-for-controlling-mechanical-and-electrical-properties
#4
Muhammad Mohsin Hossain, Md Akherul Islam, Hossain Shima, Mudassir Hasan, Moonyong Lee
This is the first study that describes how semiconducting ZnO can act as an alignment agent in carbon nanotubes (CNTs) fibers. Due to the alignment of CNTs through the ZnO nanoparticles linking groups, the CNTs inside the fibers were equally distributed by the attraction of bonding forces into sheet-like bunches, such that any applied mechanical breaking load was equally distributed to each CNT inside the fiber, making them mechanically robust against breaking loads. Although semiconductive ZnO nanoparticles were used here, the electrical conductivity of the aligned CNT fiber was comparable to bare CNT fibers, suggesting that the total electron movement through the CNTs inside the aligned CNT fiber is not disrupted by the insulating behavior of ZnO nanoparticles...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106210/multi-step-continuous-flow-synthesis
#5
Joshua Britton, Colin L Raston
Organic chemistry is continually evolving to improve the syntheses of value added and bioactive compounds. Through this progression, a concomitant advancement in laboratory technology has occurred. Many researchers now choose to mediate transformations in continuous-flow systems given the many benefits over round bottom flasks. Furthermore, reaction scale up is often less problematic as this is addressed at the inception of the science. Although single-step transformations in continuous-flow systems are common, multi-step transformations are more valuable...
January 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28104341/water-level-fluctuations-influence-sediment-porewater-chemistry-and-methylmercury-production-in-a-flood-control-reservoir
#6
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/28103106/low-temperature-alkaline-ph-hydrolysis-of-oxygen-free-titan-tholins-carbonates-impact
#7
Coralie Brassé, Arnaud Buch, Patrice Coll, François Raulin
Titan, the largest moon of Saturn, is one of the key planetary objects in the field of exobiology. Its dense, nitrogen-rich atmosphere is the site of important organic chemistry. This paper focuses on the organic aerosols produced in Titan's atmosphere that play an important role in atmospheric and surface processes and in organic chemistry as it applies to exobiological interests. To produce reliable laboratory analogues of these aerosols, we developed, tested, and optimized a device for the synthesis of clean tholins...
January 2017: Astrobiology
https://www.readbyqxmd.com/read/28103032/-naked-lithium-cation-strongly-activated-metal-cations-facilitated-by-carborane-anions
#8
Yu Kitazawa, Ryo Takita, Kengo Yoshida, Atsuya Muranaka, Seijiro Matsubara, Masanobu Uchiyama
Experimental and spectroscopic studies revealed unprecedented reactivity of "naked" lithium cation with very weakly coordinating anions including carborane anions. The super-activated lithium cation has greatly enhanced Lewis acidic character, and mediates various organic reactions, such as carbonyl-ene reaction, NBS-bromination of unactivated aromatics, and Friedel-Crafts alkylation, that are not promoted by conventional lithium salts. Chemical robustness of the counter anion also plays an important role in the chemistry of strongly activated lithium cation...
January 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28103018/copper-oxygen-complexes-revisited-structures-spectroscopy-and-reactivity
#9
Courtney E Elwell, Nicole L Gagnon, Benjamin D Neisen, Debanjan Dhar, Andrew D Spaeth, Gereon M Yee, William B Tolman
A longstanding research goal has been to understand the nature and role of copper-oxygen intermediates within copper-containing enzymes and abiological catalysts. Synthetic chemistry has played a pivotal role in highlighting the viability of proposed intermediates and expanding the library of known copper-oxygen cores. In addition to the number of new complexes that have been synthesized since the previous reviews on this topic in this journal (Mirica, L. M.; Ottenwaelder, X.; Stack, T. D. P. Chem. Rev. 2004, 104, 1013-1046 and Lewis, E...
January 19, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28102692/de-novo-assembly-of-highly-substituted-morpholines-and-piperazines
#10
Pravin Patil, Rudrakshula Madhavachary, Katarzyna Kurpiewska, Justyna Kalinowska-Tłuścik, Alexander Dömling
The morpholine and piperazine with their remarkable physical and biochemical properties are popular heterocycles in organic and medicinal chemistry used in rational property design. However, in the majority of cases these rings are added to an existing molecule in a building block approach thus limiting their substitution pattern and diversity. Here we introduce a versatile de novo synthesis of the morpholine and piperazine rings using multicomponent reaction chemistry. The large scale amenable building blocks can be further substituted at up to four positions, making this a very versatile scaffold synthesis strategy...
January 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28102668/adventures-in-reactive-intermediate-chemistry-a-perspective-and-retrospective
#11
Robert A Moss
I review aspects of my research on reactive intermediates, specifically the physical organic chemistry of carbenes and carbocations. The topics treated include carbenoids, carbenic philicity, absolute rates of carbene/alkene additions, the diazirine exchange reaction and derived carbenes, carbene equilibria, carbocations from diazotates, and carbocations from alkoxychlorocarbenes. The essay concludes with observations on the protean nature of physical organic chemistry.
January 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28102364/indefinitely-stable-iron-iv-cage-complexes-formed-in-water-by-air-oxidation
#12
Stefania Tomyn, Sergii I Shylin, Dmytro Bykov, Vadim Ksenofontov, Elzbieta Gumienna-Kontecka, Volodymyr Bon, Igor O Fritsky
In nature, iron, the fourth most abundant element of the Earth's crust, occurs in its stable forms either as the native metal or in its compounds in the +2 or +3 (low-valent) oxidation states. High-valent iron (+4, +5, +6) compounds are not formed spontaneously at ambient conditions, and the ones obtained synthetically appear to be unstable in polar organic solvents, especially aqueous solutions, and this is what limits their studies and use. Here we describe unprecedented iron(IV) hexahydrazide clathrochelate complexes that are assembled in alkaline aqueous media from iron(III) salts, oxalodihydrazide and formaldehyde in the course of a metal-templated reaction accompanied by air oxidation...
January 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28101114/dietary-and-socio-demographic-determinants-of-serum-persistent-organic-pollutants-pops-levels-in-pregnant-women-in-tehran
#13
Bita Eslami, Batool Hossein-Rashidi, Kazem Naddafi, Noushin Rastkari, Abolghasem Djazayeri, Hossein Malekafzali
Objective: To determine the levels of Polychlorinated biphenyls (PCBs) and Polybrominateddiphenyl ethers (PBDEs) as persistent organic pollutants (POPs) in serum of primiparous women at the third trimester of pregnancy and identify the main determinants of POPs levels such as socio-demographic, lifestyle, and diet in Tehran. Materials and methods: One- hundred eighty five serum samples from two simultaneous case-control studies were collected from September 2013 until August 2015.Ten most abundant PCB congeners (International Union of Pure and Applied Chemistry (IUPAC) congeners 28, 52, 74, 99, 101, 118, 138, 153, 180 and 187) as well as eight PBDE congeners (IUPAC congeners 28, 47, 99, 100, 153, 154, 183 and 209)were analyzed by Gas Chromatography Mass Spectrometry (GC/MS)...
September 2016: Journal of Family & Reproductive Health
https://www.readbyqxmd.com/read/28100048/unanticipated-stickiness-of-%C3%AE-pinene
#14
Hilary M Chase, Junming Ho, Mary Alice Upshur, Regan J Thomson, Victor S Batista, Franz M Geiger
Hilary M. Chase1#, Junming Ho2#, Mary Alice Upshur1, Regan J. Thomson1, Victor S. Batista3, Franz M. Geiger1* 1Department of Chemistry, Northwestern University, Evanston, IL. 60208, United States; 2 Agency for Science, Technology and Research, Institute of High Performance Computing, 1 Fusionopolis Way #16-16 Connexis North, Singapore 138632; 3Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT. 06520, United States # These authors contributed equally to this work. *corresponding author: geigerf@chem...
January 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28099019/combined-molecular-dynamics-atoms-in-molecules-and-ir-studies-of-the-bulk-mono-fluoro-ethanol-and-bulk-ethanol-to-understand-the-role-of-organic-fluorine-in-hydrogen-bond-network
#15
Biswajit Biswas, Saptarsi Mondal, Prashant Chandra Singh
Presence of the fluorocarbon group in fluorinated alcohols makes them an important class of molecules which have diverse applications in the field of separation techniques, synthetic chemistry, polymer industry, and biology. In this paper, we have performed the density function theory calculation along with atom in molecule analysis, molecular dynamics simulation as well as IR measurements of the bulk mono fluoro-ethanol (MFE) and compared them with the bulk ethanol (ETH) in order to understand the effect of fluorocarbon group in the structure as well as hydrogen bond network of the bulk MFE...
January 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28097707/covalent-bond-formation-via-on-surface-chemistry
#16
REVIEW
Philipp Alexander Held, Harald Fuchs, Armido Studer
In this Review article pioneering work and recent achievements in the emerging research area of on-surface chemistry is discussed. On-surface chemistry, sometimes also called two-dimensional chemistry, shows great potential for bottom-up preparation of defined nanostructures. In contrast to traditional organic synthesis, where reactions are generally conducted in well-defined reaction flasks in solution, on-surface chemistry is performed in the cavity of a scanning probe microscope on a metal crystal under ultrahigh vacuum conditions...
January 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28097044/study-on-the-single-dose-toxicity-of-shineumhur-pharmacopuncture-injected-into-the-muscles-of-rats
#17
Hohyun Jeong, Eunhye Cha, Jongcheol Lee, Seongjin Lee, Manyong Park, Dongwoung Kim, Bongkeun Song, Jongdeok Lee, Sungchul Kim
OBJECTIVES: This study was carried out to analyze the single dose toxicity of ShinEumHur (SEH) pharmacopuncture injected into the muscles of Sprague-Dawley rats. METHODS: The SEH pharmacopuncture was made in a clean room at the Korean Pharmacopuncture Institute (K-GMP). After the mixing process with sterile distilled water had been completed, the pH was controlled to between 7.0 and 7.5. All experiments were conducted at Biotoxtech, an institution authorized to perform non-clinical studies under the Good Laboratory Practice (GLP) regulations...
December 2016: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28096422/hydrogen-isotope-fractionation-in-methane-plasma
#18
François Robert, Sylvie Derenne, Guillaume Lombardi, Khaled Hassouni, Armelle Michau, Peter Reinhardt, Rémi Duhamel, Adriana Gonzalez, Kasia Biron
The hydrogen isotope ratio (D/H) is commonly used to reconstruct the chemical processes at the origin of water and organic compounds in the early solar system. On the one hand, the large enrichments in deuterium of the insoluble organic matter (IOM) isolated from the carbonaceous meteorites are interpreted as a heritage of the interstellar medium or resulting from ion-molecule reactions taking place in the diffuse part of the protosolar nebula. On the other hand, the molecular structure of this IOM suggests that organic radicals have played a central role in a gas-phase organosynthesis...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28094920/antifouling-thin-film-composite-membranes-by-controlled-architecture-of-zwitterionic-polymer-brush-layer
#19
Caihong Liu, Jongho Lee, Jun Ma, Menachem Elimelech
In this study, we demonstrate a highly antifouling thin-film-composite (TFC) membrane by grafting a zwitterionic polymer brush via atom-transfer radical-polymerization (ATRP), a controlled, environmentally benign chemical process. Initiator molecules for polymerization were immobilized on the membrane surface by bio-inspired catechol chemistry, leading to the grafting of a dense zwitterionic polymer brush layer. Surface characterization revealed that the modified membrane exhibits reduced surface roughness, enhanced hydrophilicity, and lower surface charge...
January 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28094525/photocatalytic-color-switching-of-transition-metal-hexacyanometalate-nanoparticles-for-high-performance-light-printable-rewritable-paper
#20
Wenshou Wang, Ji Feng, Yifan Ye, Fenglei Lyu, Yi-Sheng Liu, Jinghua Guo, Yadong Yin
Developing efficient photoreversible color switching systems for constructing rewritable paper is of significant practical interest owing to the potential environmental benefits including forest conservation, pollution reduction, and resource sustainability. Here we report that the color change associated with the redox chemistry of nanoparticles of Prussian blue and its analogues could be integrated with the photocatalytic activity of TiO2 nanoparticles to construct a class of new photoreversible color switching systems, which can be conveniently utilized for fabricating ink-free, light printable rewritable paper with various working colors...
January 17, 2017: Nano Letters
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