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https://www.readbyqxmd.com/read/27910448/triton-burnup-measurements-in-kstar-using-a-neutron-activation-system
#1
Jungmin Jo, MunSeong Cheon, Jun Young Kim, T Rhee, Junghee Kim, Yue-Jiang Shi, M Isobe, K Ogawa, Kyoung-Jae Chung, Y S Hwang
Measurements of the time-integrated triton burnup for deuterium plasma in Korea Superconducting Tokamak Advanced Research (KSTAR) have been performed following the simultaneous detection of the d-d and d-t neutrons. The d-d neutrons were measured using a (3)He proportional counter, fission chamber, and activated indium sample, whereas the d-t neutrons were detected using activated silicon and copper samples. The triton burnup ratio from KSTAR discharges is found to be in the range 0.01%-0.50% depending on the plasma conditions...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910397/enhanced-magnetic-field-probe-array-for-improved-excluded-flux-calculations-on-the-c-2u-advanced-beam-driven-field-reversed-configuration-plasma-experiment
#2
T Roche, M C Thompson, R Mendoza, I Allfrey, E Garate, J Romero, J Douglass
External flux conserving coils were installed onto the exterior of the C-2U [M. W. Binderbauer et al., Phys. Plasmas 22, 056110 (2015)] confinement vessel to increase the flux confinement time of the system. The 0.5 in. stainless steel vessel wall has a skin time of ∼5 ms. The addition of the external copper coils effectively increases this time to ∼7 ms. This led to better-confined/longer-lived field-reversed configuration (FRC) plasmas. The fringing fields generated by the external coils have the side effect of rendering external field measurements invalid...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909921/high-valent-copper-in-biomimetic-and-biological-oxidations
#3
REVIEW
William Keown, J Brannon Gary, T Daniel P Stack
A long-standing debate in the Cu-O2 field has revolved around the relevance of the Cu(III) oxidation state in biological redox processes. The proposal of Cu(III) in biology is generally challenged as no spectroscopic or structural evidence exists currently for its presence. The reaction of synthetic Cu(I) complexes with O2 at low temperature in aprotic solvents provides the opportunity to investigate and define the chemical landscape of Cu-O2 species at a small-molecule level of detail; eight different types are characterized structurally, three of which contain at least one Cu(III) center...
December 1, 2016: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/27892491/selected-biomarkers-revealed-potential-skin-toxicity-caused-by-certain-copper-compounds
#4
Hairui Li, Pei Zhen Toh, Jia Yao Tan, Melvin T Zin, Chi-Ying Lee, Bo Li, Melvina Leolukman, Hongqian Bao, Lifeng Kang
Copper is an essential mineral and plays important roles in skin growth and activity. Copper delivery through skin can provide beneficial effects but its potential to induce skin irritation reactions is often overlooked. Data on dermal toxicity caused by copper compounds is scant. Some recognized in vitro skin toxicity methods are unsuitable for all metal compounds. Here, we employ a keratinocyte-based model and evaluated the skin irritation potential of copper compounds at cellular, genomic and proteomic levels...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27891306/forces-in-initial-archwires-during-leveling-and-aligning-an-in-vitro-study
#5
Rajesh Kumar Reddy, Pavan K Katari, Tarun T Bypureddy, Venkata Naga Sri Harsha Anumolu, Yenugupalli Kartheek, Nemala R V Sairam
AIM: This in-vitro study measured the force deflection behavior of selected initial alignment archwires by conducting three-point bending tests under controlled tests. The study tested three wire designs, namely, co-axial multistranded stainless steel wires, nickel-titanium, and copper-nickel-titanium archwires. MATERIALS AND METHODS: The archwires were ligated to a specially designed metal jig, simulating the arch. A testing machine (Instron) recorded activation and deactivation forces of different deflections at 37°C...
September 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/27881965/fundamental-role-of-methylenetetrahydrofolate-reductase-677-c%C3%A2-%C3%A2-%C3%A2-t-genotype-and-flavin-compounds-in-biochemical-phenotypes-for-schizophrenia-and-schizoaffective-psychosis
#6
Stephanie Fryar-Williams
The Mental Health Biomarker Project (2010-2016) explored variables for psychosis in schizophrenia and schizoaffective disorder. Blood samples from 67, highly characterized symptomatic cases and 67 gender and age matched control participants were analyzed for methyl tetrahydrofolate reductase (MTHFR) 677C → T gene variants and for vitamin B6, B12 and D, folate, unbound copper, zinc cofactors for enzymes in the methylation cycle, and related catecholamine pathways. Urine samples were analyzed for indole-catecholamines, their metabolites, and oxidative-stress marker, hydroxylpyrolline-2-one (HPL)...
2016: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/27864666/evaluation-of-serum-trace-element-levels-and-superoxide-dismutase-activity-in-patients-with-inflammatory-bowel-disease-translating-basic-research-into-clinical-application
#7
Erfan Mohammadi, Durdi Qujeq, Hassan Taheri, Karimollah Hajian-Tilaki
The relationship of minerals and trace elements with inflammatory bowel disease (IBD) is complex. Alterations in their metabolism can be induced by the diseases and their complications. To study the role of trace elements in IBD patients' serum zinc and copper and their related enzymes, including superoxide dismutase (SOD), activity were measured in patients with IBD patients as well as in healthy subjects. In addition, the correlation between serum trace element levels, albumin, total protein, urea level, copper/zinc ratio, and disease activity (DA) was determined in these subjects...
November 18, 2016: Biological Trace Element Research
https://www.readbyqxmd.com/read/27861731/identification-of-mineral-binding-peptides-that-discriminate-between-chalcopyrite-and-enargite
#8
Susan Curtis, Franziska L Lederer, W Scott Dunbar, Ross T A MacGillivray
Innovative approaches to the separation of minerals and subsequent extraction of metals are imperative owing to the increasing mineralogical complexity of ore deposits that are difficult or even impossible to separate into slurries or solutions containing only the minerals or metals of interest. Low recovery of metal is typical for these complex deposits leading to significant losses to tailings. In addition, the minerals often contain impurities, some toxic, which are difficult and costly to control or manage during the processing of a concentrate or other mineral product...
November 14, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27853967/the-bioconcentration-ability-of-heavy-metal-research-for-50-kinds-of-rice-under-the-same-test-conditions
#9
Wen-Juan Xie, Lei Che, Guang-Yu Zhou, Li-Na Yang, Min-Yu Hu
The aims of this experiment are to explore the accumulation of metal contamination of different varieties of rice planted in paddy fields and to provide a basis for the further research. The rice specimens were grown in and collected from a total area of 8.24 acres of rice planting fields where local farmers cultivated 50 different kinds of rice. The crops were grown using the methods of seedling, transplanting, fertilizing, and irrigation, under the guidance of professional and technical personnel. The 50 kinds of paddy rice contain 20 kinds of conventional rice, 15 kinds of two-line hybrid rice, 15 kinds of three-line hybrid rice, and the whole experiment lasted 100 days...
December 2016: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27853875/oxygen-activation-by-mononuclear-mn-co-and-ni-centers-in-biology-and-synthetic-complexes
#10
REVIEW
Adam T Fiedler, Anne A Fischer
The active sites of metalloenzymes that catalyze O2-dependent reactions generally contain iron or copper ions. However, several enzymes are capable of activating O2 at manganese or nickel centers instead, and a handful of dioxygenases exhibit activity when substituted with cobalt. This minireview summarizes the catalytic properties of oxygenases and oxidases with mononuclear Mn, Co, or Ni active sites, including oxalate-degrading oxidases, catechol dioxygenases, and quercetin dioxygenase. In addition, recent developments in the O2 reactivity of synthetic Mn, Co, or Ni complexes are described, with an emphasis on the nature of reactive intermediates featuring superoxo-, peroxo-, or oxo-ligands...
November 16, 2016: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/27848090/environmental-geochemistry-of-the-abandoned-mamut-copper-mine-sabah-malaysia
#11
Antony van der Ent, Mansour Edraki
The Mamut Copper Mine (MCM) located in Sabah (Malaysia) on Borneo Island was the only Cu-Au mine that operated in the country. During its operation (1975-1999), the mine produced 2.47 Mt of concentrate containing approximately 600,000 t of Cu, 45 t of Au and 294 t of Ag, and generated about 250 Mt of overburden and waste rocks and over 150 Mt of tailings, which were deposited at the 397 ha Lohan tailings storage facility, 15.8 km from the mine and 980 m lower in altitude. The MCM site presents challenges for environmental rehabilitation due to the presence of large volumes of sulphidic minerals wastes, the very high rainfall and the large volume of polluted mine pit water...
November 15, 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/27847422/effect-of-tamarindus-indica-leaf-powder-on-plasma-concentrations-of-copper-zinc-and-iron-in-fluorotic-cows
#12
Pinaki Samal, R C Patra, A R Gupta, S K Mishra, D Jena, D Satapathy
AIM: The main objective of the study was to determine the deleterious effect of fluoride on plasma trace minerals of fluorotic cattle and to evaluate the effect of Tamarindus indica leaf powder toward correction of the same. MATERIALS AND METHODS: A total of 30 cattle exhibiting chronic sign of fluorosis and 10 healthy cattle from nonfluorotic area were incorporated in this study. Fluorotic cattle were divided into three equal groups consisting of 10 cattle each...
October 2016: Veterinary World
https://www.readbyqxmd.com/read/27837469/characteristics-and-products-of-the-reductive-degradation-of-3-nitro-1-2-4-triazol-5-one-nto-and-2-4-dinitroanisole-dnan-in-a-fe-cu-bimetal-system
#13
E Kitcher, W Braida, A Koutsospyros, J Pavlov, T-L Su
It has been shown previously that, under acidic conditions, 3-nitro-1,2,4-triazol-5-one (NTO) and 2,4-dinitroanisole (DNAN) degrade in the presence of iron/copper bimetal particles; the reactions can be modeled by pseudo-first-order kinetics. This study investigates the reaction mechanisms of the degradation processes under different conditions. Batch studies were conducted using laboratory-prepared solutions and an industrial insensitive munition-laden (IMX) wastewater. The influence of parameters such as initial pH of the solution, copper/iron (Fe-Cu) contact, and solid/liquid ratio were systematically investigated to assess their impact on the reaction kinetics...
November 11, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27818117/-induced-abortion-guidelines-for-clinical-practice%C3%A2-%C3%A2-text-of-the-guidelines-short-text
#14
C Vayssière, A Gaudineau, L Attali, K Bettahar, S Eyraud, P Faucher, P Fournet, D Hassoun, M Hatchuel, C Jamin, B Letombe, T Linet, M Msika Razon, A Ohanessian, H Segain, S Vigoureux, N Winer, S Wylomanski, A Agostini
OBJECTIVE: Develop recommendations for the practice of induced abortion. MATERIALS AND METHODS: The Pubmed database, the Cochrane Library and the recommendations from the French and foreign Gyn-Obs societies or colleges have been consulted. RESULTS: The number of induced abortions (IA) has been stable for several decades. There are a lot of factors explaining the choice of abortion when there is an unplanned pregnancy (UPP). Early initiation and choice of contraception in connection to the woman's life are associated with lower NSP...
November 3, 2016: Journal de Gynécologie, Obstétrique et Biologie de la Reproduction
https://www.readbyqxmd.com/read/27816692/il-6-a-central-acute-phase-mediator-as-an-early-biomarker-for-exposure-to-zinc-based-metal-fumes
#15
R Baumann, S Joraslafsky, A Markert, I Rack, S Davatgarbenam, V Kossack, B Gerhards, T Kraus, P Brand, M Gube
AIMS: Systemic C-reactive protein (CRP) increases 1day after short-term inhalation of welding fumes containing zinc and/or copper. The aim of the current study was to find further, possibly earlier systemic biomarkers after inhalation of different welding fumes containing zinc and traces of aluminum, with or without copper, as these metal combinations become more common in modern joining technology. METHODS: The study group consisted of 15 non-smoking male volunteers with healthy lung function data and without any occupational metal fume exposure...
November 2, 2016: Toxicology
https://www.readbyqxmd.com/read/27809398/site-preference-in-multimetallic-nanoclusters-incorporation-of-alkali-metal-ions-or-copper-atoms-into-the-alkynyl-protected-body-centered-cubic-cluster-au7-ag8-c%C3%A2-c-t-bu-12
#16
Yu Wang, Haifeng Su, Liting Ren, Sami Malola, Shuichao Lin, Boon K Teo, Hannu Häkkinen, Nanfeng Zheng
The synthesis, structure, substitution chemistry, and optical properties of the gold-centered cubic monocationic cluster [Au@Ag8 @Au6 (C≡C(t) Bu)12 ](+) are reported. The metal framework of this cluster can be described as a fragment of a body-centered cubic (bcc) lattice with the silver and gold atoms occupying the vertices and the body center of the cube, respectively. The incorporation of alkali metal atoms gave rise to [Mn Ag8-n Au7 (C≡C(t) Bu)12 ](+) clusters (n=1 for M=Na, K, Rb, Cs and n=2 for M=K, Rb), with the alkali metal ion(s) presumably occupying the vertex site(s), whereas the incorporation of copper atoms produced [Cun Ag8 Au7-n (C≡C(t) Bu)12 ](+) clusters (n=1-6), with the Cu atom(s) presumably occupying the capping site(s)...
November 3, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27806597/influence-of-standard-rf-coil-materials-on-surface-and-buildup-dose-from-a-6-mv-photon-beam-in-magnetic-field
#17
A Ghila, B G Fallone, S Rathee
PURPOSE: Magnetic resonance guided teletherapy systems aspire to image the patient concurrently with the radiation delivery. Thus, the radiofrequency (RF) coils used for magnetic resonance imaging, placed on or close to patient skin and in close proximity to the treatment volume, would be irradiated leading to modifications of radiation dose to the skin and in the buildup region. The purpose of this work is to measure and assess these dose modifications due to standard off-the-shelf RF coil materials...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27806193/neuroprotective-effect-of-a-new-7-8-dihydroxycoumarin-based-fe2-cu2-chelator-in-cell-and-animal-models-of-parkinson-s-disease
#18
Pabla Aguirre, Olimpo García-Beltrán, Victoria Tapia, Yorka Muñoz, Bruce Kennedy Cassels, Marco T Nunez
Disturbed iron homeostasis, often coupled to mitochondrial dysfunction, plays an important role in the progression of common neurodegenerative diseases such as Parkinson disease (PD). Recent studies have underlined the relevance of iron chelation therapy for the treatment of these diseases. Here we describe the synthesis, chemical and biological characterization of the multifunctional chelator 7,8-dihydroxy-4-((methylamino)methyl)-2H-chromen-2-one (DHC12). Metal selectivity of DHC12 was Cu2+ ̴ Fe2+ > Zn2+ > Fe3+...
November 2, 2016: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27804051/receptor-mediated-toxicity-of-human-amylin-fragment-aggregated-by-short-and-long-term-incubations-with-copper-ions
#19
Giuseppe Caruso, Donatella A Distefano, Paolo Parlascino, Claudia G Fresta, Giuseppe Lazzarino, Susan M Lunte, Vincenzo G Nicoletti
Human amylin (hA1-37) is a polypeptide hormone secreted in conjunction with insulin from the pancreatic β-cells involved in the pathogenesis of type 2 diabetes mellitus (T2DM). The shorter fragment hA17-29 than full-length peptide is capable to form amyloids "in vitro". Here, we monitored the time course of hA17-29 β-amyloid fibril and oligomer formation [without and with copper(II)], cellular toxicity of different amyloid aggregates, and involvement of specific receptors (receptor for advanced glycation end-products, RAGE; low-affinity nerve growth factor receptor, p75-NGFR) in aggregate toxicity...
November 1, 2016: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27802606/-killer-microcapsules-that-can-selectively-destroy-target-microparticles-in-their-vicinity
#20
Chandamany Arya, Hyuntaek Oh, Srinivasa R Raghavan
We have developed microscale polymer capsules that are able to chemically degrade a certain type of polymeric microbead in their immediate vicinity. The inspiration here is from the body's immune system, where killer T cells selectively destroy cancerous cells or cells infected by pathogens while leaving healthy cells alone. The "killer" capsules are made from the cationic biopolymer chitosan by a combination of ionic cross-linking (using multivalent tripolyposphate anions) and subsequent covalent cross-linking (using glutaraldehyde)...
November 2, 2016: ACS Applied Materials & Interfaces
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