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https://www.readbyqxmd.com/read/29334637/contamination-characteristics-and-source-apportionment-of-heavy-metals-in-topsoil-from-an-area-in-xi-an-city-china
#1
Xiuduan Chen, Xinwei Lu
As soil-extractable elements potentially pose ecological and health risks, identifying their contamination characteristics and sources is crucial. Therefore, to understand topsoil trace elements in the urban ring zone from the Second Ring Road to the Third Ring of Xi'an city in China, we determined the concentrations of Zn, Co, V, As, Cu, Mn, Ba, Ni and Pb, and analyzed the sources of the contamination. The results showed that the individual pollution indices of Pb, Co, Cu, Zn, Ba, Ni, Mn, As, and V were 1...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29334419/a-metallo-pro-drug-to-target-cu-ii-in-the-context-of-alzheimer-s-disease
#2
Amandine Conte-Daban, Vinita Ambike, Régis Guillot, Nicolas Delsuc, Clotilde Policar, Christelle Hureau
Alzheimer's disease and oxidative stress are connected. In the present communication, we report the use of a Mn(II)-based superoxide dismutase mimic ([MnII(L)]+, 1+) as a pro-drug candidate to target Cu(II) associated events, i.e. Cu(II)-induced formation of reactive oxygen species (ROS) and modulation of the amyloid-beta (Abeta) peptide aggregation. Complex 1+ is able to remove Cu(II) from Abeta, stop ROS and prevent alteration of Abeta aggregation as would do the corresponding free ligand LH. Using 1+ instead of LH in further biological applications would have the double advantage to avoid the cell toxicity of LH and to benefit from its proved SOD-like activity...
January 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29334388/catalytic-de-hydrogenation-promoted-by-non-precious-metals-co-fe-and-mn-recent-advances-in-an-emerging-field
#3
REVIEW
Georgy A Filonenko, Robbert van Putten, Emiel J M Hensen, Evgeny A Pidko
Catalytic hydrogenation and dehydrogenation reactions form the core of the modern chemical industry. This vast class of reactions is found in any part of chemical synthesis starting from the milligram-scale exploratory organic chemistry to the multi-ton base chemicals production. Noble metal catalysis has long been the key driving force in enabling these transformations with carbonyl substrates and their nitrogen-containing counterparts. This review is aimed at introducing the reader to the remarkable progress made in the last three years in the development of base metal catalysts for hydrogenations and dehydrogenative transformations...
January 15, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29334209/comparison-of-the-effects-of-vitrification-on-gene-expression-of-mature-mouse-oocytes-using-cryotop-and-open-pulled-straw
#4
Fardin Amidi, Zahra Khodabandeh, Mohamad Hossain Nori Mogahi
Background: Oocyte cryopreservation is an essential part of the assisted reproductive technology (ART), which was recently introduced into clinical practice. This study aimed to evaluate the effects of two vitrification systems-Cryotop and Open Pulled Straw (OPS)-on mature oocytes gene expressions. MATERIALS AND METHODS: In this experimental study, the survival rate of metaphase II (MII) mouse oocytes were assessed after cryopreservation by vitrification via i. OPS or ii...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29333857/active-site-revealed-for-water-oxidation-on-electrochemically-induced-%C3%AE-mno2-role-of-spinel-to-layer-phase-transition
#5
Yefei Li, Zhi-Pan Liu
Seeking for active MnOx material as artificial water splitting catalyst has been a long history since the discovery of PSII system in Nature. To date, the highest activity MnOx catalyst reported for oxygen evolution reaction (OER) is however not common MnO2 polymorphs (α-, β-, δ-MnO2), but nascent δ-MnO2 layer produced in situ from spinel under electrochemical conditions with unknown active site structure. Here with the stochastic surface walking (SSW) pathway sampling method, we for the first time resolve the atomic-level mechanism of spinel-to-layer Mn3O4 solid phase transition in aqueous electrolyte...
January 15, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29333683/mobility-engineering-in-vertical-field-effect-transistors-based-on-van-der-waals-heterostructures
#6
Yong Seon Shin, Kiyoung Lee, Young Rae Kim, Hyangsook Lee, I Min Lee, Won Tae Kang, Boo Heung Lee, Kunnyun Kim, Jinseong Heo, Seongjun Park, Young Hee Lee, Woo Jong Yu
Vertical integration of 2D layered materials to form van der Waals heterostructures (vdWHs) offers new functional electronic and optoelectronic devices. However, the mobility in vertical carrier transport in vdWHs of vertical field-effect transistor (VFET) is not yet investigated in spite of the importance of mobility for the successful application of VFETs in integrated circuits. Here, the mobility in VFET of vdWHs under different drain biases, gate biases, and metal work functions is first investigated and engineered...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333547/diverse-bimetallic-mechanisms-emerging-from-transition-metal-lewis-acid-base-pairs-development-of-co-catalysis-with-metal-carbenes-and-metal-carbonyl-anions
#7
Neal P Mankad
The rational development of catalytic reactions involving cooperative behavior between two catalytic reactive sites represents a frontier area of research from which novel reactivity and selectivity patterns emerge. Within this context, this Feature highlights the development of a cooperative system involving transition metal Lewis acid/base pairs. Bimetallic systems consisting of copper carbene Lewis acids and metal carbonyl anion Lewis bases, (NHC)Cu-[MCO], are easily synthesized from readily available organometallic building blocks (NHC = N-heterocyclic carbene; [MCO]- = metal carbonyl anion, e...
January 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29333387/physicochemical-and-antioxidant-properties-of-honeys-from-the-sundarbans-mangrove-forest-of-bangladesh
#8
M Rabiul Islam, Tahmina Pervin, Hemayet Hossain, Badhan Saha, Sheikh Julfikar Hossain
This study evaluated the physicochemical, nutritional, antioxidant, and phenolic properties of ten honey samples from the Sundarbans mangrove forest, Bangladesh. The average pH, electrical conductivity, total dissolved solid, ash, moisture, hydroxymethyl furfural, titrable acidity, and absorbance were 4.3, 0.38 mS/cm, 187.5 ppm, 0.14%, 17.88%, 4.4 mg/kg, 37.7 meq/kg, and 483 mAU, respectively. In the honeys, the average contents of Ca, Cu, Fe, K, Mg, Mn, and Na were 95.5, 0.19, 6.4, 302, 39.9, 3.4, and 597 ppm, respectively, whereas Cd, Cr, Pb, and Ni were not found...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29331959/probenecid-improves-cardiac-function-in-patients-with-heart-failure-with-reduced-ejection-fraction-in-vivo-and-cardiomyocyte-calcium-sensitivity-in-vitro
#9
Nathan Robbins, Mark Gilbert, Mohit Kumar, James W McNamara, Patrick Daly, Sheryl E Koch, Ginger Conway, Mohamed Effat, Jessica G Woo, Sakthivel Sadayappan, Jack Rubinstein
BACKGROUND: Transient receptor potential vanilloid 2 is a calcium channel activated by probenecid. Probenecid is a Food and Drug Administration-approved uricosuric drug that has recently been shown to induce positive lusitropic and inotropic effects in animal models through cardiomyocyte transient receptor potential vanilloid 2 activation. The aim of this study was to test the hypothesis that oral probenecid can improve cardiac function and symptomatology in patients with heart failure with reduced ejection fraction and to further elucidate its calcium-dependent effects on myocyte contractility...
January 13, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29331934/characterization-and-release-profile-of-mn-al-bearing-deposits-in-drinking-water-distribution-systems
#10
Guiwei Li, Yuanxun Ding, Hongfu Xu, Junwei Jin, Baoyou Shi
Inorganic contaminants accumulation in drinking water distribution systems (DWDS) is a great threat to water quality and safety. This work assessed the main risk factors for different water pipes and discovered the release profile of accumulated materials in a full scale distribution system frequently suffered from water discoloration problem. Physicochemical characterization of pipe deposits were performed using X-ray fluorescence, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331918/dna-damage-in-marine-rock-oyster-saccostrea-cucullata-exposed-to-environmentally-available-pahs-and-heavy-metals-along-the-arabian-sea-coast
#11
Subhodeep Sarker, Deepti Vashistha, Munmun Saha Sarker, A Sarkar
Molecular biomarkers are used world wide for quick assessment of the immediate effect of environmental pollution on marine ecosystems. Recently, we evaluated oxidative stress responses of marine rock oyster, Saccostrea cucullata impacted due to polycyclic aromatic hydrocarbons (PAHs) accumulated in their tissues at a few sampling sites along the coast of Goa around the region of the Arabian sea coast, India (Sarkar et al., 2017). Using a combination of partial alkaline unwinding and comet assays, we now report a comprehensive study on the impairment of DNA integrity (DI) in S...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29331716/bioremediation-of-cadmium-and-zinc-contaminated-soil-using-rhodobacter-sphaeroides
#12
Weihua Peng, Xiaomin Li, Jingxiang Song, Wei Jiang, Yingying Liu, Wenhong Fan
Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Rhodobacter sphaeroides was used to bioremediate soils contaminated with cadmium (Cd) and zinc (Zn). The study found that the treatment reduced the overall bioavailable fractions (e.g., exchangeable and carbonate bound phases) of Cd and Zn. More stable fractions (e.g., Fe-Mn oxide, organic bound, and residual phases (only for Zn)) increased after bioremediation. A wheat seedling experiment revealed that the phytoavailability of Cd was reduced after bioremediation using R...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29330818/trace-elements-in-four-freshwater-fish-from-a-mine-impacted-river-spatial-distribution-species-specific-accumulation-and-risk-assessment
#13
Yuyu Jia, Lin Wang, Junfei Cao, Shan Li, Zhaoguang Yang
The concentrations of 16 elements (Mg, Al, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Cd, Ba, and Pb) were determined in four fish species (Carassius auratus, Squaliobarbus curriculus, Pelteobagrus fulvidraco, and Silurus asotus) collected in the Xiang River, a mine-impacted river in Southern China. The mean values of the elements analyzed in fish muscles were in the decreasing order of Mg > Ca > Zn > Fe > Sr > Al > Cu > Mn > Ba > As > Cr > Pb > Ni > V > Co > Cd...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330689/the-efficiency-of-acoustic-radiation-force-impulse-arfi-elastography-in-the-diagnosis-and-staging-of-carpal-tunnel-syndrome
#14
Harun Arslan, Alpaslan Yavuz, Ferda İlgen, Abdurrahman Aycan, Mesut Ozgokce, Hüseyin Akdeniz, Abdussamet Batur
OBJECTIVES: The aim of the present study was to quantify the stiffness of the median nerve (MN) at the carpal tunnel inlet by acoustic radiation force impulse (ARFI) elastography and to evaluate whether ARFI can be used in diagnosis and staging of carpal tunnel syndrome (CTS). METHODS: Sonographic examinations of 96 wrists in 50 patients were included in the study. The cross-sectional area and stiffness of the MN were quantitatively measured by B-mode ultrasonography (USG) and ARFI...
January 12, 2018: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29330513/magnetic-and-structural-properties-of-glass-coated-heusler-type-microwires-exhibiting-martensitic-transformation
#15
A Zhukov, M Ipatov, J J Del Val, V Zhukova, V A Chernenko
We have studied magnetic and structural properties of the Heusler-type Ni-Mn-Ga glass-coated microwires prepared by Tailor-Ulitovsky technique. As-prepared sample presents magnetoresistance effect and considerable dependence of magnetization curves (particularly magnetization values) on magnetic field attributed to the magnetic and atomic disorder. Annealing strongly affects the temperature dependence of magnetization and Curie temperature of microwires. After annealing of the microwires at 973 K, the Curie temperature was enhanced to about 280 K which is beneficial for the magnetic solid state refrigeration...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330512/inactivated-rotavirus-vaccine-by-parenteral-administration-induces-mucosal-immunity-in-mice
#16
Theresa K Resch, Yuhuan Wang, Sung-Sil Moon, Jessica Joyce, Song Li, Mark Prausnitz, Baoming Jiang
To improve the safety and efficacy of oral rotavirus vaccines, we developed an inactivated rotavirus vaccine (IRV) for parenteral administration. Since it remains unknown whether parenteral vaccination can induce mucosal immunity, we performed a comprehensive assessment of immune responses to IRV in mice with an adjuvant-free dissolving polymer MN patch or by alum-adjuvanted IM injection. We demonstrated that IRV induced the expression of the gut homing receptor LPAM-1 on T and B cells in spleen and mLN of vaccinated mice...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329868/a-procedure-for-the-measurement-of-oxygen-consumption-rates-ocrs-in-red-wines-and-some-observations-about-the-influence-of-wine-initial-chemical-composition
#17
Almudena Marrufo-Curtido, Vanesa Carrascón, Mónica Bueno, Vicente Ferreira, Ana Escudero
The rates at which wine consumes oxygen are important technological parameters for whose measurement there are not accepted procedures. In this work, volumes of 8 wines are contacted with controlled volumes of air in air-tight tubes containing oxygen-sensors and are further agitated at 25 °C until O2 consumption is complete. Three exposure levels of O2 were used: low (10 mg/L) and medium or high (18 or 32 mg/L plus the required amount to oxidize all wine SO2). In each oxygen level, 2-4 independent segments following pseudo-first order kinetics were identified, plus an initial segment at which wine consumed O2 very fast...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329277/synthesis-structural-characterization-antimicrobial-activity-and-in-vitro-biocompatibility-of-new-unsaturated-carboxylate-complexes-with-2-2-bipyridine
#18
Gina Vasile Scăețeanu, Mariana Carmen Chifiriuc, Coralia Bleotu, Crina Kamerzan, Luminiţa Măruţescu, Constantin G Daniliuc, Cătălin Maxim, Larisa Calu, Rodica Olar, Mihaela Badea
The synthesis, structural characterization, cytotoxicity, and antimicrobial properties of four new complexes formed by employing acrylate anion and 2,2'-bipyridine are reported herein. X-ray crystallography revealed the trinuclear nature of [Mn₃(2,2'-bipy)₂(C₃H₃O₂)₆] (1), meanwhile complexes with general formula [M(2,2'-bipy)(C₃H₃O₂)₂(H₂O)x]∙yH₂O ((2) M: Ni, x = 1, y = 0; (3) M: Cu, x = 1, y = 0; (4) M: Zn, x = 0, y = 1; 2,2'-bipy: 2,2'-bipyridine; C₃H₃O₂: acrylate anion) were shown to be mononuclear...
January 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29329099/accumulation-patterns-and-risk-assessment-of-metals-and-metalloid-in-muscle-and-offal-of-free-range-chickens-cattle-and-goat-in-benin-city-nigeria
#19
Emmanuel Temiotan Ogbomida, Shouta M M Nakayama, Nesta Bortey-Sam, Balazs Oroszlany, Isioma Tongo, Alex Ajeh Enuneku, Ogbeide Ozekeke, Martins Oshioriamhe Ainerua, Iriagbonse Priscillia Fasipe, Lawrence Ikechukwu Ezemonye, Hazuki Mizukawa, Yoshinori Ikenaka, Mayumi Ishizuka
The use of free range animals for monitoring environmental health offers opportunities to detect exposure and assess the toxicological effects of pollutants in terrestrial ecosystems. Potential human health risk of dietary intake of metals and metalloid via consumption of offal and muscle of free range chicken, cattle and goats by the urban population in Benin City was evaluated. Muscle, gizzard, liver and kidney samples were analyzed for Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, and Pb concentrations using inductively coupled plasma mass spectrometer (ICP-MS) while Hg was determined using Hg analyzer...
January 9, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29329008/selective-formation-of-copper-nanoparticles-from-acid-mine-drainage-using-nanoscale-zerovalent-iron-particles
#20
R A Crane, D J Sapsford
Nanoscale zerovalent iron (nZVI) has been investigated for the selective formation of Cu nanoparticles from acid mine drainage (AMD) taken from a legacy mine site in the UK. Batch experiments were conducted containing unbuffered (pH 2.67 at t = 0) and pH buffered (pH < 3.1) AMD which were exposed to nZVI at 0.1-2.0 g/L. Results demonstrate that nZVI is selective for Cu, Cd and Al removal (>99.9% removal of all metals within 1 h when nZVI ≥ 1.0 g/L) from unbuffered AMD despite the coexistent of numerous other metals in the AMD, namely: Na, Ca, Mg, K, Mn and Zn...
December 18, 2017: Journal of Hazardous Materials
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