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https://www.readbyqxmd.com/read/28646768/source-profiling-of-arsenic-and-heavy-metals-in-the-selangor-river-basin-and-their-maternal-and-cord-blood-levels-in-selangor-state-malaysia
#1
Nobumitsu Sakai, Zohour Alsaad, Nguyen Thi Thuong, Kenji Shiota, Minoru Yoneda, Mustafa Ali Mohd
Arsenic and 5 heavy metals (nickel, copper, zinc, cadmium and lead) were quantitated in surface water (n = 18) and soil/ore samples (n = 45) collected from 5 land uses (oil palm converted from forest, oil palm in peat swamp, bare land, quarry and forest) in the Selangor River basin by inductively coupled plasma mass spectrometry (ICP-MS). Geographic information system (GIS) was used as a spatial analytical tool to classify 4 land uses (forest, agriculture/peat, urban and bare land) from a satellite image taken by Landsat 8...
June 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28646737/pollution-characteristics-and-source-identification-of-trace-metals-in-riparian-soils-of-miyun-reservoir-china
#2
Lanfang Han, Bo Gao, Jin Lu, Yang Zhou, Dongyu Xu, Li Gao, Ke Sun
The South-to-North Water Diversion Project, one of China's largest water diversion projects, has aroused widespread concerns about its potential ecological impacts, especially the potential release of trace metals from shoreline soils into Miyun Reservoir (MYR). Here, riparian soil samples from three elevations and four types of land use were collected. Soil particle size distributions, contents and chemical fractionations of trace metals and lead (Pb) isotopic compositions were analyzed. Results showed that soil texture was basically similar in four types of land use, being mainly composed of sand, with minor portions of clay and silt, while recreational land contained more abundant chromium (Cr), copper (Cu), zinc (Zn) and cadmium (Cd), suggesting a possible anthropogenic source for this soil pollution...
June 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28646662/estimation-of-the-molar-absorption-coefficient-of-copper-salicylate-within-the-spectral-range-300-350nm
#3
N L Lavrik, N U Mulloev
Additional absorption was detected in absorption spectra within the range 300-350nm after addition of copper sulfate CuSO4(aq) to a solution of sodium salicylate NaНSal (рН=7.8). The additional maximum absorption was observed at 320nm. Assuming that the additional absorption depends on the formation of copper salicylate CuSal, the molar absorption coefficient εCuSal of this complex was determined to be (3.8±0.02)·10(3)М(-1)сm(-1). This value is almost equal to that of monoanion HSal(-), εHSal-=(3.6±0...
June 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28645012/associations-between-toxic-and-essential-trace-elements-in-maternal-blood-and-fetal-congenital-heart-defects
#4
Yanqiu Ou, Michael S Bloom, Zhiqiang Nie, Fengzhen Han, Jinzhuang Mai, Jimei Chen, Shao Lin, Xiaoqing Liu, Jian Zhuang
Prenatal exposure to toxic trace elements, including heavy metals, is an important public health concern. Few studies have assessed if individual and multiple trace elements simultaneously affect cardiac development. The current study evaluated the association between maternal blood lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), and selenium (Se) levels and congenital heart defects (CHDs) in offspring. This hospital-based case-control study included 112 case and 107 control infants. Maternal peripheral blood draw was made during gestational weeks 17-40 and used to determine trace element levels by inductively coupled plasma mass spectrometry...
June 20, 2017: Environment International
https://www.readbyqxmd.com/read/28644726/cytotoxic-and-genotoxic-actions-of-casiopeina-iii-ea-cas-iii-ea-in-somatic-and-germ-cells-of-drosophila-melanogaster
#5
L M Vidal, E Pimentel, M P Cruces, S Hernández, L Ruiz-Azuara
Casiopeinas® are a group of newly synthesized drugs designed to treat cancer. These copper (Cu) complexes exhibit cytostatic, cytotoxic, genotoxic, and antineoplastic activities through different mechanisms of action. To evaluate the influence of these compounds, some in vivo studies were performed using predominantly somatic cells. The aim of the present study was to examine the cytotoxic and genotoxic actions of Casiopeina III-Ea (Cas III-Ea) in somatic as well as germ cells of Drosophila melanogaster. For cytotoxicity, the productivity and some morphometric parameters were measured and genotoxicity was assessed by means of the somatic mutation and recombination test assay in the wing...
June 23, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28644490/potentiating-role-of-copper-on-spatial-memory-deficit-induced-by-beta-amyloid-and-evaluation-of-mitochondrial-function-markers-in-the-hippocampus-of-rats
#6
Ladan Behzadfar, Mohammad Abdollahi, Omid Sabzevari, Rohollah Hosseini, Ahmad Salimi, Parvaneh Naserzadeh, Mohammad Sharifzadeh, Jalal Pourahmad
Mounting evidence suggests that copper, a crucial element in normal brain function, plays an important role in the etiology of Alzheimer's disease, which is known as a neurodegenerative mitochondrial disorder. However, the precise mechanisms of its effects on cognitive and mitochondrial functions through the CNS have not been thoroughly recognized yet. In this study, we aimed to investigate the long-term (3-week) effects of copper sulfate (50, 100 and 200 mg kg(-1) day(-1)) exposure on learning and memory as well as on mitochondrial function in the hippocampus of rats in the presence and absence of beta amyloid (1 μg μl(-1) per side) intrahippocampally (IH)...
June 23, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28644390/the-electrosome-a-surface-displayed-enzymatic-cascade-in-a-biofuel-cell-s-anode-and-a-high-density-surface-displayed-biocathodic-enzyme
#7
Alon Szczupak, Dror Aizik, Sarah Moraïs, Yael Vazana, Yoav Barak, Edward A Bayer, Lital Alfonta
The limitation of surface-display systems in biofuel cells to a single redox enzyme is a major drawback of hybrid biofuel cells, resulting in a low copy-number of enzymes per yeast cell and a limitation in displaying enzymatic cascades. Here we present the electrosome, a novel surface-display system based on the specific interaction between the cellulosomal scaffoldin protein and a cascade of redox enzymes that allows multiple electron-release by fuel oxidation. The electrosome is composed of two compartments: (i) a hybrid anode, which consists of dockerin-containing enzymes attached specifically to cohesin sites in the scaffoldin to assemble an ethanol oxidation cascade, and (ii) a hybrid cathode, which consists of a dockerin-containing oxygen-reducing enzyme attached in multiple copies to the cohesin-bearing scaffoldin...
June 23, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28644356/low-hepatic-tissue-copper-in-pediatric-nonalcoholic-fatty-liver-disease
#8
Michael Mendoza, Shelley Caltharp, Ming Song, Lindsay Collin, Juna V Konomi, Craig J McClain, Miriam B Vos
OBJECTIVE: Animal models and studies in adults have demonstrated that copper restriction increases severity of liver injury in nonalcoholic fatty liver disease (NAFLD). This has not been studied in children. We aimed to determine if lower tissue copper is associated with increased NAFLD severity in children. METHODS: This was a retrospective study of pediatric patients who had a liver biopsy including a hepatic copper quantitation. The primary outcome compared hepatic copper concentration in NAFLD versus non-NAFLD...
July 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28644029/a-tandem-oxidative-annulation-strategy-for-the-synthesis-of-tetracyclic-3-spirooxindole-benzofuranones
#9
Chunxia Zhang, Min Liu, Mingruo Ding, Hao Xie, Fengzhi Zhang
A simple and efficient method was developed for the construction of the medicinally important tetracyclic 3-spirooxindole benzofuranones. In this highly atom- and step-economical one-pot protocol, one quaternary carbon center, two new cycles, and four new bonds (C-C/C-O/C-N) were formed under simple ligand-free copper-catalyzed conditions through a novel tandem oxidative annulation strategy.
June 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28643864/hydroxyacetone-a-glycerol-based-platform-for-electrocatalytic-hydrogenation-and-hydrodeoxygenation-processes
#10
Waldemar Sauter, Olaf Lennart Bergmann, Uwe Schröder
Here we propose the use of hydroxyacetone, a dehydration product of glycerol, as a platform for the electrocatalytic synthesis of acetone, 1,2-propanediol and 2-propanol. 11 non-noble metals were investigated as electrode materials in combination with three different electrolyte compositions towards the selectivity, Coulomb efficiency (CE) and reaction rates of the electrocatalytic hydrogenation (formation of 1,2-propanediol) and hydrodeoxygenation (formation of acetone and propanol) of hydroxyacetone. With a selectivity of 84...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643509/secondary-copper-smelters-as-sources-of-chlorinated-and-brominated-polycyclic-aromatic-hydrocarbons
#11
Rong Jin, Guorui Liu, Minghui Zheng, Xiaoxu Jiang, Yuyang Zhao, Li Li Yang, Xiaolin Wu, Yang Xu
The generation of and extent to which chlorinated and brominated polycyclic aromatic hydrocarbons (Cl/Br-PAHs) are formed and released from secondary copper smelters remain unknown. This field study, to our knowledge, is the first to identify secondary copper smelters as new sources of Cl/Br-PAHs. Mass concentrations of ∑19Cl-PAHs and ∑19Br-PAHs ranged from 5.8 to 271 ng Nm-3 and 0.59 to 52.4 ng Nm-3, respectively. A comparison of Cl/Br-PAH concentrations in stack gas and fly ash from secondary copper smelters indicated that the use of scrap copper as raw material or the addition of coal or heavy oil as reductant may contribute to the elevated formation and emission of Cl/Br-PAHs...
June 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28643423/heterocorrole-conformations-little-saddling-much-ruffling
#12
Jörn Rösner, Birte Cordes, Stefanie Bahnmüller, Gabor Homolya, Dimitri Sakow, Peter Schweyen, Richard Wicht, Martin Bröring
10-Heterocorrole complexes with oxygen, sulfur, and selenium at position 10 of the macrocycle, and with the divalent ions of nickel, copper, and palladium were prepared and investigated. The focus was set onto the size adaptation and matching mechanisms of cavity sizes vs. ionic radii in corrole-type macrocycles. A full set of single crystal X-ray analyses was obtained and revealed that in all but one case the N4 binding site of the ring-contracted tetrapyrrole is larger than necessary to bind the metal ion without deformation...
June 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28643274/an-unexplained-congenital-disorder-of-glycosylation-ii-in-a-child-with-neurohepatic-involvement-hypercholesterolemia-and-hypoceruloplasminemia
#13
Pier Luigi Calvo, Marco Spada, Ivana Rabbone, Michele Pinon, Francesco Porta, Fabio Cisarò, Stefania Reggiani, Angelo B Cefalù, Luisella Sturiale, Domenico Garozzo, Dirk J Lefeber, Jaak Jaeken
We report on a 12-year-old adopted boy with psychomotor disability, absence seizures, and normal brain MRI. He showed increased (but initially, at 5 months, normal) serum cholesterol, increased alkaline phosphatases, transiently increased transaminases and hypoceruloplasminemia with normal serum and urinary copper. Blood levels of immunoglobulins, haptoglobin, antithrombin, and factor XI were normal. A type 2 serum transferrin isoelectrofocusing and hypoglycosylation of apoCIII pointed to a combined N- and O-glycosylation defect...
June 23, 2017: JIMD Reports
https://www.readbyqxmd.com/read/28642953/crack-tips-enriched-platinum-copper-superlattice-nanoflakes-as-highly-efficient-anode-electrocatalysts-for-direct-methanol-fuel-cells
#14
Lijun Zheng, Dachi Yang, Rong Chang, Chengwen Wang, Gaixia Zhang, Shuhui Sun
We have developed "crack-tips" and "superlattice" enriched Pt-Cu nanoflakes (NFs), benefiting from the synergetic effects of "crack-tips" and "superlattice crystals"; the Pt-Cu NFs exhibit 4 times higher mass activity, 6 times higher specific activity and 6 times higher stability than those of the commercial Pt/C catalyst, respectively. Meanwhile, the Pt-Cu NFs show more enhanced CO tolerance than the commercial Pt/C catalyst.
June 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28642858/pathological-fracture-of-femoral-neck-leading-to-a-diagnosis-of-wilson-s-disease-a-case-report-and-review-of-literature
#15
Nishit Bhatnagar, Purushotham Lingaiah, Jeetendra Singh Lodhi, Yugal Karkhur
Wilson's disease (WD) is a rare inherited disorder of copper metabolism. It chiefly has hepatic, neurological and ophthalmic manifestations. Although osteoporosis, rickets and early arthritis are common features of WD, they are under-recognized. Musculoskeletal manifestations very rarely lead to diagnosis of the disease. Here we present a case of a 12-year-old girl who presented with a 3-month-old pathological fracture of neck of femur. WD was diagnosed on investigating the cause of the pathological fracture, which was managed by performing a conventional McMurray's intertrochanteric osteotomy...
May 2017: Journal of Bone Metabolism
https://www.readbyqxmd.com/read/28642077/recovery-of-tin-from-metal-powders-of-waste-printed-circuit-boards
#16
Tianzu Yang, Pengchun Zhu, Weifeng Liu, Lin Chen, Duchao Zhang
To avoid the adverse effects of tin on the smelting process used to recover copper from metal powders of waste printed circuit boards, an effective process is proposed that selectively extracts tin and its associated metals. That impacts of alkaline pressure oxidation leaching parameters on metal conversion were systematically investigated. The results showed that Sn, Pb, Al and small amounts of Zn in the metal powders were leached out, leaving copper residue. By optimizing the conditions, leaching recovery of 98...
June 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28641718/alterations-in-lipid-profile-zinc-and-copper-levels-and-superoxide-dismutase-activities-in-normal-pregnancy-and-preeclampsia
#17
Pardis Keshavarz, B Fatemeh Nobakht M Gh, Seyed Reza Mirhafez, Mohsen Nematy, Mohsen Azimi-Nezhad, Sedigheh Ayati Afin, Habibollah Esmaily, Leila Pourali, Atieh Mehdizadeh Hakak, Mohammad Soukhtanloo, Masoumeh Mirteimouri, Nayereh Ghomian, Gordon A Ferns
BACKGROUND: Increased oxidative stress (OS) and lipid peroxidation may be involved in the pathogenesis of preeclampsia (PE). We conducted a case-control study to evaluate the levels of plasma lipids and trace elements as well as activity of superoxide dismutase (SOD) in PE. MATERIALS AND METHODS: The study consisted of 100 patients who had been diagnosed with PE and 100 normotensive pregnant women who underwent medical checkups that served as the control group. Lipid profile, zinc (Zn) and copper (Cu) levels and SOD activities were measured in the plasma of all subjects...
June 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28641596/types-and-prevalence-of-extended-spectrum-beta-lactamase-producing-enterobacteriaceae-in-poultry
#18
Eva-Maria Saliu, Wilfried Vahjen, Jürgen Zentek
For several billion years, bacteria have developed mechanisms to resist antibacterial substances. In modern time, antibiotics are frequently used in veterinary and human medicine for prevention and treatment of diseases, globally still also for their growth promoting effects as feed additives. This complex situation has evolved in accelerating development and prevalence of multi-drug resistant bacteria in livestock and people. Extended-spectrum beta-lactamase (ESBL) producing bacteria are resistant to a wide range of ß-lactam antibiotics...
June 23, 2017: Animal Health Research Reviews
https://www.readbyqxmd.com/read/28641540/metallothionein-is-a-potential-therapeutic-strategy-for-amyotrophic-lateral-sclerosis
#19
Shin-Ichi Ono
Lou Gehrig's disease, a synonym of amyotrophic lateral sclerosis, is an adult-onset lethal neurodegenerative disorder. Irrespective of extensive efforts to elucidate the pathogenesis of the disease and searches for therapies, no favorable pharmacotherapeutic strategies have yet to be proposed. In a popular rodent model of ALS, G93A SOD1 mice, intracellular copper conditions were geared toward copper accumulation inside cells, resulting in an acceleration of oxidative stress and apoptotic process. Disruption of intracellular copper homeostasis was common to transgenic mice expressing human mutant SOD1s...
June 22, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28641226/evaluation-of-trace-element-concentration-in-cancerous-and-non-cancerous-tissues-of-human-stomach
#20
Shadi Kohzadi, Farshad Sheikhesmaili, Ramesh Rahehagh, Baran Parhizkar, Ebrahim Ghaderi, Hozan Loqmani, Behzad Shahmoradi, Ebrahim Mohammadi, Afshin Maleki
Gastric cancer has a high mortality rate in west of Iran. Various environmental elements are proposed as cancer risk factors including trace elements. Trace elements can induce initiation or progression of carcinogenesis via oxidative stress and DNA injury. The aim of this study was to measure and compare some trace element concentration (Ca, Cu, Fe, As, Mg, Ni, Cd and Cr) in gastric cancer tissues and normal tissues. For this purpose, 35 patients with gastric cancer and 30 without any cancer were biopsied...
June 17, 2017: Chemosphere
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