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https://www.readbyqxmd.com/read/28830076/copper-ii-bis-thiosemicarbazonato-complexes-as-anti-chlamydial-agents
#1
James W Marsh, Karrera Y Djoko, Alastair G McEwan, Wilhelmina M Huston
Lipophilic copper (Cu)-containing complexes have shown promising antibacterial activity against a range of bacterial pathogens. To examine the susceptibility of the intracellular human pathogen Chlamydia trachomatis to copper complexes containing bis(thiosemicarbazone) ligands [Cu(btsc)], we tested the in vitro effect of CuII-diacetyl- and CuII-glyoxal-bis[N(4)-methylthiosemicarbazonato] (Cu(atsm) and Cu(gtsm), respectively) on C. trachomatis. Cu(atsm) and to a greater extent, Cu(gtsm), prevented the formation of infectious chlamydial progeny...
September 29, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28830054/linkage-between-human-population-and-trace-elements-in-soils-of-the-pearl-river-delta-implications-for-source-identification-and-risk-assessment
#2
Yan Lin, Jin Ma, Zhengdong Zhang, Yifang Zhu, Hong Hou, Long Zhao, Zaijin Sun, Wenjuan Xue, Huading Shi
The human population is both an emitter and receptor of metals. This study aims to clarify how the relationship of metals and metalloids to human populations influences their source characterization and health risk, based on metal concentrations in 298 soil samples in the Pearl River Delta (PRD) and the corresponding zip-code level population. Nickel (Ni), copper (Cu), zinc (Zn), cadmium (Cd), mercury (Hg), and lead (Pb), but not chromium (Cr) and arsenic (As), were significantly correlated with population (p<0...
August 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28830042/raman-spectroscopy-of-organic-solid-and-fluid-inclusions-in-the-oldest-halite-of-lgom-area-sw-poland
#3
Tomasz Toboła
Raman spectroscopy was applied to determine the degree of recrystallization and the influence of the secondary solution migration on the Oldest Halite (Na1) in Lubin-Głogów Copper District (LGOM). Numerous organic matter (OM) inclusions which generally show weak structural ordering was found in halite crystals. In this context they are similar to solid bitumens or carbonaceous matter of low thermal alteration. The difference in the Raman line-shape of OM indicated various thermal alteration of salt from the Oldest Halite formation due to hot fluid flow...
August 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28829915/synthesis-of-indazolones-via-friedel-crafts-cyclization-of-blocked-masked-n-isocyanates
#4
Eslam Basiouny Elkaeed, Jing An, Andre Martin Beauchemin
Nitrogen-substituted isocyanates (N-isocyanates) are a rare class of amphoteric reagents with high, but underdeveloped synthetic potential. Herein, we systematically study the formation of indazolones by Friedel-Crafts cyclization of N-isocyanates. This study features the use of hydrazine-derived blocked (masked) N-isocyanate precursors: the effect of the masking (blocking) group and the reaction scope have been delineated. Substrate synthesis has also been improved using a reported copper-catalyzed coupling of arylbismuth (V) reagents that is compatible with the hemilabile OPh blocking group...
August 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28829464/a-new-synthetic-route-to-in-chain-metallopolymers-via-copper-i-catalyzed-azide-platinum-acetylide-iclick
#5
C C Beto, E D Holt, Y Yang, I Ghiviriga, K S Schanze, A S Veige
The first example of an in-chain metallo-poly(triazolate) synthesized by CuAAC is reported. Azido-platinum-acetylide (A-M-B) monomers are catalytically polymerized with copper(i) acetate to yield 1,2,3-triazolate linked Pt(ii) units. The metallopolymers are characterized by multinuclear NMR, IR, UV/Vis, GPC, and MS.
August 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28829100/copper-catalyzed-transformation-of-ketones-to-amides-via-c-co-c-alkyl-bond-cleavage-directed-by-picolinamide
#6
Haojie Ma, Xiaoqiang Zhou, Zhenzhen Zhan, Daidong Wei, Chong Shi, Xingxing Liu, Guosheng Huang
Copper catalyzed chemoselective cleavage of the C(CO)-C(alkyl) bond leading to C-N bond formation with chelation assistance of N-containing directing groups is described. Inexpensive Cu(ii)-acetate serves as a convenient catalyst for this transformation. This method highlights the emerging strategy to transform unactivated alkyl ketones into amides in organic synthesis and provides a new strategy for C-C bond cleavage.
August 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28829061/photoluminescence-properties-of-tadf-emitting-three-coordinate-silver-i-halide-complexes-with-diphosphine-ligands-a-comparison-study-with-copper-i-complexes
#7
Masahisa Osawa, Masashi Hashimoto, Isao Kawata, Mikio Hoshino
Synthesis and X-ray structures of silver(i) bromide complexes with diphosphine ligands LMe, LEt, and LiPr are described, where LMe = 1,2-bis[bis(2-methylphenyl)phosphino]benzene, LEt = 1,2-bis[bis(2-ethylphenyl)phosphino]benzene, and LiPr = 1,2-bis[bis(2-isopropylphenyl)phosphino]benzene. Crystals of complex [(LMe)AgBr]2 (1), prepared from LMe and AgBr, showed a tetrahedral bimetallic structure. LEt and LiPr, with bulkier substituents than those of LMe, reacted with AgBr to give crystalline three-coordinate complexes (LEt)AgBr (2) and (LiPr)AgBr (3)...
August 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28828967/heavy-metals-in-soil-at-a-waste-electrical-and-electronic-equipment-processing-area-in-china
#8
Weihua Gu, Jianfeng Bai, Haiyan Yao, Jing Zhao, Xuning Zhuang, Qing Huang, Chenglong Zhang, JingWei Wang
For the objective of evaluating the contamination degree of heavy metals and analysing its variation trend in soil at a waste electrical and electronic equipment processing area in Shanghai, China, evaluation methods, which include single factor index method, geo-accumulation index method, comprehensive pollution index method, and potential ecological risk index method, were adopted in this study. The results revealed that the soil at a waste electrical and electronic equipment processing area was polluted by arsenic, cadmium, copper, lead, zinc, and chromium...
August 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28828683/the-effects-of-copper-and-zinc-on-survival-growth-and-reproduction-of-the-cladoceran-daphnia-longispina-introducing-new-data-in-an-old-issue
#9
Celso Martins, Fátima T Jesus, António J A Nogueira
Metal contamination is still a major environmental issue due to their continuous deposition and persistence. In this work we intended to assess the impact that Copper (Cu) and Zinc (Zn) exert in life-history parameters of Daphnia longispina, a common cladoceran in freshwater environments. Thus, we studied the effects of Cu (20-300 µg/L) and Zn (500-4000 µg/L) on the survival, growth, reproduction, feeding rate and population growth rate of D. longispina. Though survival was only reduced for the highest concentration of each metal, other endpoints were strongly affected by lower concentrations...
August 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28828571/comparison-of-heavy-metal-levels-of-farmed-and-escaped-farmed-rainbow-trout-and-health-risk-assessment-associated-with-their-consumption
#10
Memet Varol, Muhammet Raşit Sünbül
In this study, levels of ten metals (arsenic, cadmium, cobalt, chromium, copper, iron, manganese, nickel, lead, and zinc) in muscles of farmed and escaped farmed rainbow trout (Oncorhynchus mykiss) in the Keban Dam Reservoir (Turkey) were determined. Also, human health risks associated with their consumption were assessed. Of ten metals, only Co and Fe levels in escaped rainbow trout were significantly higher than those in farmed rainbow trout. The metal levels in farmed and escaped rainbow trout were below the maximum permissible limits...
August 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28828457/selective-cleavage-of-the-polyphosphoester-in-crosslinked-copper-based-nanogels-enhanced-antibacterial-performance-through-controlled-release-of-copper
#11
Nagarajan Padmavathy, Paresh Kumar Samantaray, Lopamudra Das Ghosh, Giridhar Madras, Suryasarathi Bose
Polymeric architectures with controlled and well-defined structural features are required to render a sustainable antibacterial surface - a key requirement in the design of polymeric membranes for water purification. Herein, surface selective crosslinking of copper oxide-polyphosphoester (CuO-PPE) hybrid nanogels on to polyvinylidene fluoride-styrene maleic anhydride (PVDF/SMA) ultrafiltration membranes was developed. The hybrid nanogels, composed of PPE and CuO, with inherent antifouling and antibacterial properties, were crosslinked using a macroinitiator (polyethylene glycol, PEG) and subsequently grafted on to PVDF/SMA by alkyne-anhydride reaction...
August 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28828439/the-influence-of-metal-centres-on-the-exchange-interaction-in-heterometallic-complexes-with-oxalate-bridged-cations
#12
Lidija Androš Dubraja, Marijana Jurić, Filip Torić, Damir Pajić
The reaction of bis(phenanthroline)metal(ii) cations (M = Mn(2+), Co(2+), Ni(2+), Cu(2+) and Zn(2+)) with bis(oxalato)chromium(iii) anions in a water/ethanol solution gives rise to a series of compounds with oxalate-bridged cations, [{M(phen)2}2(μ-C2O4)][Cr(phen)(C2O4)2]2·4H2O [Mn2Cr2 (1), Co2Cr2 (2), Ni2Cr2 (3), Cu2Cr2 (4) and Zn2Cr2 (5)]. Their structural analysis reveals that all the prepared compounds crystallize in the triclinic system, space group P1[combining macron], having similar unit cell parameters, molecular structures and crystal packing features...
August 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28827712/copper-ferrites-reduced-graphene-oxide-anode-materials-for-advanced-lithium-storage-applications
#13
Junyong Wang, Qinglin Deng, Mengjiao Li, Kai Jiang, Jinzhong Zhang, Zhigao Hu, Junhao Chu
Copper ferrites are emerging transition metal oxides that have potential applications in energy storage devices. However, it still lacks in-depth designing of copper ferrites based anode architectures with enhanced electroactivity for lithium-ion batteries. Here, we report a facile synthesis technology of copper ferrites anchored on reduced graphene oxide (CuFeO2@rGO and Cu/CuFe2O4@rGO) as the high-performance electrodes. In the resulting configuration, reduced graphene offers continuous conductive channels for electron/ion transfer and high specific surface area to accommodate the volume expansion of copper ferrites...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28827547/tracing-heavy-metals-in-swine-manure-maggot-chicken-production-chain
#14
Wanqiang Wang, Wenjuan Zhang, Xiaoping Wang, Chaoliang Lei, Rui Tang, Feng Zhang, Qizhi Yang, Fen Zhu
With the development of large-scale livestock farming, manure pollution has drawn much attention. Conversion by insects is a rapid and cost-effective new method for manure management. Swine manure conversion with maggots (Musca domestica larvae) has developed, and the harvested maggots are often used as animal feed. However, the flow of heavy metals from manure to downstream processes cannot be ignored, and therefore, heavy metal content was measured in untreated raw manure, maggot-treated manure, harvested maggots and maggot-eating chickens (chest muscle and liver) to evaluate potential heavy metal risks...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28827122/new-anionic-carbosilane-dendrons-functionalized-with-a-do3a-ligand-at-the-focal-point-for-the-prevention-of-hiv-1-infection
#15
Silvia Moreno, Daniel Sepúlveda-Crespo, F Javier de la Mata, Rafael Gómez, Ma Ángeles Muñoz-Fernández
Novel third-generation polyanionic carbosilane dendrons with sulfonate or carboxylate end-groups and functionalized with a DO3A ligand at the focal point, and their corresponding copper complexes, have been prepared as antiviral compounds to prevent HIV-1 infection. The topology enables the compound to have an excellent chelating agent, DO3A, while keeping anionic peripheral groups for a therapeutic action. In this study, the cytotoxicity and anti-HIV-1 abilities of carboxylate- (5) or sulfonate-terminated (6) dendrons containing DO3A and their copper complexes (7 or 8) were evaluated...
August 18, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28826814/metal-losses-in-pyrometallurgical-operations-a-review
#16
REVIEW
Inge Bellemans, Evelien De Wilde, Nele Moelans, Kim Verbeken
Nowadays, a higher demand on a lot of metals exists, but the quantity and purity of the ores decreases. The amount of scrap, on the other hand, increases and thus, recycling becomes more important. Besides recycling, it is also necessary to improve and optimize existing processes in extractive and recycling metallurgy. One of the main difficulties of the overall-plant recovery are metal losses in slags, in both primary and secondary metal production. In general, an increased understanding of the fundamental mechanisms governing these losses could help further improve production efficiencies...
August 10, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28826801/postplacental-intrauterine-device-expulsion-by-12-weeks-a-prospective-cohort-study
#17
Lisa M Goldthwaite, Jeanelle Sheeder, Jennifer Hyer, Kristina Tocce, Stephanie B Teal
BACKGROUND: An intrauterine device (IUD) placed immediately following a delivery can serve as an effective and safe contraceptive strategy in the postpartum period. There is limited evidence that the levonorgestrel intrauterine system (LNG-IUS) may have a higher rate of expulsion compared to the copper intrauterine device (Cu-IUD), however rates of expulsion for these two IUD types have not been compared directly. OBJECTIVE: To compare expulsion rates by 12 weeks postpartum for the LNG-IUS and Cu-IUD...
August 18, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28822946/differential-expression-of-vacuolar-and-defective-cell-wall-invertase-genes-in-roots-and-seeds-of-metalliferous-and-non-metalliferous-populations-of-rumex-dentatus-under-copper-stress
#18
Zhong-Rui Xu, Shen-Wen Cai, Wu-Xing Huang, Rong-Xiang Liu, Zhi-Ting Xiong
Acid invertase activities in roots and young seeds of a metalliferous population (MP) of Rumex dentatus were previously observed to be significantly higher than those of a non-metalliferous population (NMP) under Cu stress. To date, no acid invertase gene has been cloned from R. dentatus. Here, we isolated four full-length cDNAs from the two populations of R. dentatus, presumably encoding cell wall (RdnCIN1 and RdmCIN1 from the NMP and MP, respectively) and vacuolar invertases (RdnVIN1 and RdmVIN1 from the NMP and MP, respectively)...
August 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28822814/assessment-of-drinking-water-quality-at-the-tap-using-fluorescence-spectroscopy
#19
Masoumeh Heibati, Colin A Stedmon, Karolina Stenroth, Sebastien Rauch, Jonas Toljander, Melle Säve-Söderbergh, Kathleen R Murphy
Treated drinking water may become contaminated while travelling in the distribution system on the way to consumers. Elevated dissolved organic matter (DOM) at the tap relative to the water leaving the treatment plant is a potential indicator of contamination, and can be measured sensitively, inexpensively and potentially on-line via fluorescence and absorbance spectroscopy. Detecting elevated DOM requires potential contamination events to be distinguished from natural fluctuations in the system, but how much natural variation to expect in a stable distribution system is unknown...
August 8, 2017: Water Research
https://www.readbyqxmd.com/read/28822236/synthesis-structural-studies-and-biological-activity-of-novel-cu-ii-complexes-with-thiourea-derivatives-of-4-azatricyclo-5-2-1-0-2-6-dec-8-ene-3-5-dione
#20
Aleksandra Drzewiecka-Antonik, Paweł Rejmak, Marcin T Klepka, Anna Wolska, Piotr Pietrzyk, Karolina Stępień, Giuseppina Sanna, Marta Struga
The new Cu(II) complexes of 1/2/3-(bromophenyl)-3-(1,7,8,9-tetramethyl-3,5-dioxo-4-azatricyclo[5.2.1.0(2,6)]dec-8-en-4-yl)thiourea derivatives have been synthesized. The spectroscopic studies together with density functional theory calculations of Cu(II) complexes revealed that two parent ligands coordinate to the copper cation in bidentate fashion via thiocarbonyl S and deprotonated N atoms forming rarely observed four-membered chelate ring, with nearly planar [CuN2S2] moiety. In solid state, the mononuclear complex is formed for thiourea derivative with 3-bromophenyl, whereas for Cu(II) connection with 2- and 4-bromophenyl-thioureas the formation of dinuclear complexes is observed, the latter formed by the stacking of mononuclear complexes...
August 9, 2017: Journal of Inorganic Biochemistry
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