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https://www.readbyqxmd.com/read/28671221/a-new-preparation-of-a-bifunctional-crystalline-heterogeneous-copper-electrocatalyst-by-electrodeposition-using-a-robson-type-macrocyclic-dinuclear-copper-complex-for-efficient-hydrogen-and-oxygen-evolution-from-water
#1
Samit Majumder, Ashraf Abdel Haleem, Perumandla Nagaraju, Yoshinori Naruta
The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In this study, a water soluble Robson-type macrocyclic dicopper(ii) complex has been used for the first time as a catalyst precursor for the generation of a copper-based bifunctional heterogeneous catalyst film, which can be used for both HER and OER at a near neutral pH...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28333827/levels-of-silicon-in-maternal-cord-and-newborn-serum-and-their-relation-with-those-of-zinc-and-copper
#2
N Marta Díaz-Gómez, Emmanuel Bissé, Thibault Senterre, Nieves L González-González, Eduardo Domenech, Gabriele Lindinger, Thomas Epting, Flora Barroso
BACKGROUND: Evidence of silicon's importance to health has been gradually accumulating. Nevertheless, there are few studies comparing serum silicon levels in newborns with maternal levels. Likewise, little is known concerning the inter-relation between silicon and other trace elements. OBJECTIVE: The present study evaluated maternal and newborn levels of serum silicon and their relation to those of zinc and copper. METHODS: We measured serum silicon, copper, and zinc in 66 pregnant women, in the umbilical cord of their infants, and in 44 newborns, by atomic absorption spectrophotometry...
April 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28191583/a-hierarchically-porous-nickel-copper-phosphide-nano-foam-for-efficient-electrochemical-splitting-of-water
#3
Li Wei, Kunli Goh, Özgür Birer, H Enis Karahan, Jian Chang, Shengli Zhai, Xuncai Chen, Yuan Chen
Electrochemical splitting of water to produce oxygen (O2) and hydrogen (H2) through a cathodic hydrogen evolution reaction (HER) and an anodic oxygen evolution reaction (OER) is a promising green approach for sustainable energy supply. Here we demonstrated a porous nickel-copper phosphide (NiCuP) nano-foam as a bifunctional electrocatalyst for highly efficient total water splitting. Prepared from a bubble-templated electrodeposition method and subsequent low-temperature phosphidization, NiCuP has a hierarchical pore structure with a large electrochemical active surface area...
February 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28079359/pristine-graphene-electrode-in-hydrogen-evolution-reaction
#4
Aozhen Xie, Ningning Xuan, Kun Ba, Zhengzong Sun
Graphene, the sp(2) carbonaceous two-dimensional (2D) material, is gaining more attention in recent electrochemical studies. However, this atomic thick electrode usually suffers with surface contamination and poor electrochemical endurance. To overcome the drawbacks, we developed a PMMA-assisted, flipped transfer method to fabricate the graphene electrode with pristine surface and prolonged lifetime in hydrogen evolution reaction (HER). The HER performances of the single-layer graphene (SLG) were evaluated on various insulating and conductive substrates, including SiO2, polymers, SLG, highly oriented pyrolytic graphite (HOPG), and copper...
January 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28041671/liberation-of-metal-clads-of-waste-printed-circuit-boards-by-removal-of-halogenated-epoxy-resin-substrate-using-dimethylacetamide
#5
Himanshu Ranjan Verma, Kamalesh K Singh, Tilak Raj Mankhand
Present work reports the evaluation of dimethylacetamide (DMAc) as a solvent to dissolve the halogenated epoxy resin substrate (HERS) of waste printed circuit boards (WPCBs). Studies revealed that HERS dissolution attributes to the cracking and delamination of WPCB's layers. Variation of the parameters governing the dissolution elucidated that dissolution is directly dependent on temperature and WPCBs concentration in DMAc. The results also showed that increase in the WPCBs size drastically retards the rate of HERS dissolution...
February 2017: Waste Management
https://www.readbyqxmd.com/read/28008761/crystalline-copper-phosphide-nanosheets-as-an-efficient-janus-catalyst-for-overall-water-splitting
#6
Ali Han, Hanyu Zhang, Ruihan Yuan, Hengxing Ji, Pingwu Du
Hydrogen is essential to many industrial processes and could play an important role as an ideal clean energy carrier for future energy supply. Herein, we report for the first time the growth of crystalline Cu3P phosphide nanosheets on conductive nickel foam (Cu3P@NF) for electrocatalytic and visible light-driven overall water splitting. Our results show that the Cu3P@NF electrode can be used as an efficient Janus catalyst for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER)...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27930511/four-year-follow-up-of-a-wilson-disease-pedigree-complicated-with-epilepsy-and-hypopituitarism-case-report-with-a-literature-review
#7
REVIEW
Qi-Jie Zhang, Liu-Qing Xu, Chong Wang, Wei Hu, Ning Wang, Wan-Jin Chen
RATIONALE: Wilson's disease (WD) is an autosomal recessive inherited disorder of copper metabolism with excellent prognosis if treated timely. However, WD is usually prone to neglect and misdiagnosis at an early stage. We reported a rare WD pedigree, and the clinical features, laboratory tests, and gene mutations were analyzed in detail. PATIENT CONCERNS: The patient was a 17-year-old and 136-cm-tall girl who presented with limb weakness, combined with multi-organ disorders including blind eye, epilepsy, and hypopituitarism...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27818117/-induced-abortion-guidelines-for-clinical-practice%C3%A2-%C3%A2-text-of-the-guidelines-short-text
#8
REVIEW
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...
December 2016: Journal de Gynécologie, Obstétrique et Biologie de la Reproduction
https://www.readbyqxmd.com/read/27748380/cu2o-cuo-bilayered-composite-as-a-high-efficiency-photocathode-for-photoelectrochemical-hydrogen-evolution-reaction
#9
Yang Yang, Di Xu, Qingyong Wu, Peng Diao
Solar powered hydrogen evolution reaction (HER) is one of the key reactions in solar-to-chemical energy conversion. It is desirable to develop photocathodic materials that exhibit high activity toward photoelectrochemical (PEC) HER at more positive potentials because a higher potential means a lower overpotential for HER. In this work, the Cu2O/CuO bilayered composites were prepared by a facile method that involved an electrodeposition and a subsequent thermal oxidation. The resulting Cu2O/CuO bilayered composites exhibited a surprisingly high activity and good stability toward PEC HER, expecially at high potentials in alkaline solution...
October 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27748114/a-highly-active-and-robust-copper-based-electrocatalyst-toward-hydrogen-evolution-reaction-with-low-overpotential-in-neutral-solution
#10
Jialei Du, Jianying Wang, Lvlv Ji, Xiaoxiang Xu, Zuofeng Chen
Although significant progress has been made recently, copper-based materials have long been considered to be ineffective catalysts toward the hydrogen evolution reaction (HER), in most cases, requiring high overpotentials more than 300 mV. We report here that a Cu(0)-based nanoparticle film electrodeposited in situ from a Cu(II) oxime complex can act as a highly active and robust HER electrocatalyst in neutral phosphate buffer solution. The as-prepared nanoparticle film is of poor crystallization, which incorporates significant amounts of oxime ligand residues and buffer anions PO4(3-)...
November 9, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27729749/ataxic-gait-following-total-gastrectomy-for-gastric-cancer
#11
Chang Ho Hwang, Dong Jin Park, Gyu Yeol Kim
A 58-year-old woman, who had undergone total gastrectomy for early gastric cancer 9 years previously, visited the outpatient clinic complaining of progressive difficulty in walking for 15 d. Laboratory examinations showed macrocytic anemia and a decreased serum vitamin B12 concentration and increased serum concentrations of folate, vitamin E and copper. Magnetic resonance imaging showed multifocal high signal intensities along the posterior column of the cervical and thoracic spinal cord. Treatment consisted of intramuscular injections of vitamin B12 for 7 d, which increased her serum level of vitamin B12 to normal...
October 7, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27695244/cardiac-arrhythmia-in-wilson-s-disease-an-oversighted-and-overlooked-entity
#12
Bhupender Kumar Bajaj, Ankur Wadhwa, Richa Singh, Saurabh Gupta
Wilson's disease is a multisystem disorder which manifests with hepatic, neurological, musculoskeletal, hematological, renal, and cardiac symptoms. The hepatic and neurological manifestations often overshadow the other system involvement including cardiac symptoms and signs, which may prove fatal. We report a case of a young female who presented with progressive parkinsonian features and dystonia for around 4 months followed 2 months later by the complaint of episodes of light-headedness. She was diagnosed to have Wilson's disease based on the presence of Kayser-Fleischer ring and laboratory parameters of copper metabolism...
October 2016: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/27645757/copper-deficiency-myelopathy-probably-caused-by-long-lasting-daily-excessive-intake-of-zink
#13
Rieko Motooka, Shinji Yamamoto
We report a 39-year-old woman with slowly progressive spastic gait and paresthesia in the lower extremities. Cervical spinal MRI revealed high intensity in the dorsal column from vertebrae C2 to C7. Laboratory findings showed normal vitamin B12 and low serum copper level. By lifestyle history taking, we noticed her extreme unbalanced diet of having 15-20 oysters everyday over 5 years. Then we considered that zinc excess caused copper deficiency myelopathy. We needed to pay attention to copper and zinc level if the patient has a symptom resembling subacute combined degeneration of spinal cord with normal serum vitamin B12...
October 28, 2016: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/27559613/self-supported-cedarlike-semimetallic-cu3p-nanoarrays-as-a-3d-high-performance-janus-electrode-for-both-oxygen-and-hydrogen-evolution-under-basic-conditions
#14
Chun-Chao Hou, Qian-Qian Chen, Chuan-Jun Wang, Fei Liang, Zheshuai Lin, Wen-Fu Fu, Yong Chen
There has been strong and growing interest in the development of cost-effective and highly active oxygen evolution reaction (OER) electrocatalysts for alternative fuels utilization and conversion devices. We report herein that semimetallic Cu3P nanoarrays directly grown on 3D copper foam (CF) substrate can function as effective electrocatalysts for water oxidation. Specifically, the surface oxidation-activated Cu3P only required a relatively low overpotential of 412 mV to achieve a current density of 50 mA cm(-2) and displayed a small Tafel slope of 63 mV dec(-1) in 0...
September 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27530422/a-copper-porphyrin-based-conjugated-mesoporous-polymer-derived-bifunctional-electrocatalyst-for-hydrogen-and-oxygen-evolution
#15
Shengsheng Cui, Manman Qian, Xiang Liu, Zijun Sun, Pingwu Du
Scalable and robust catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are required for the implementation of water splitting technologies as a globally applicable method of producing renewable hydrogen. Herein, we report nitrogen-enriched porous carbon materials containing copper/copper oxide, derived from copper porphyrin-based conjugated mesoporous polymers (CMPs), as a bifunctional catalyst for both HER and OER. These catalysts have a high surface area, unique tubular structure, and strong synergistic effect of copper/copper oxide and porous carbons, resulting in excellent performance for water splitting...
September 8, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27524027/an-in-vivo-study-for-targeted-delivery-of-copper-organic-complex-to-breast-cancer-using-chitosan-polymer-nanoparticles
#16
Arindam Pramanik, Dipranjan Laha, Sandeep Kumar Dash, Sourav Chattopadhyay, Somenath Roy, Dipak Kumar Das, Panchanan Pramanik, Parimal Karmakar
We have developed a strategy for targeted delivery of metal-diketo complex, "bis(2,4-pentanedionato) copper(II)" to breast cancer cells both in-vitro and in-vivo. This metal-organic complex induced ROS and subsequently DNA damage as well as mitochondrial membrane depolarization was observed. The mitochondria rupture further triggered apoptosis. For in-vitro targeting strategies, two different approaches were employed, folic acid or her-2 specific peptide (KCCYSL) was attached to stearic acid-modified polymeric Chitosan nanoparticles loaded with metal-organic complex "bis(2,4-pentanedionato)copper(II)"...
November 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27379896/a-rare-cause-of-myoclonus-a-cupric-conundrum
#17
Karen M Doherty, Joanne Shields, Raeburn Forbes, Moyra Gray, Seamus Kearney, Alexander P Maxwell, John McKinley
A woman aged 22 years presented with a 3-year history of jerks when brushing her teeth and a tremor when carrying drinks. Examination revealed a bilateral jerky tremor, stimulus-sensitive myoclonus, and difficulty with tandem gait. Thyroid and liver function test results were normal, but she had rapidly progressive renal failure. Serum copper, ceruloplasmin, and manganese levels were normal, but her urinary copper level was elevated on 2 occasions. Pathological findings on organ biopsy prompted genetic testing to confirm the diagnosis...
September 1, 2016: JAMA Neurology
https://www.readbyqxmd.com/read/27144519/dendrimer-antibody-conjugate-to-target-and-image-her-2-overexpressing-cancer-cells
#18
James B Otis, Hong Zong, Alina Kotylar, Anna Yin, Somnath Bhattacharjee, Han Wang, James R Baker, Su He Wang
Although many breast and lung cancers overexpress human epidermal growth factor receptor-2 (HER-2), no methods currently exist for effective and early detection of HER-2-positive cancers. To address this issue, we designed and synthesized dendrimer-based novel nano-imaging agents that contain gold nanoparticles (AuNPs) and gadolinium (Gd), conjugated with the humanized anti-HER-2 antibody (Herceptin). Generation 5 (G5) polyamidoamine (PAMAM) dendrimers were selected as the backbone for the nano-imaging agents due to their unique size, high ratio of surface functional groups and bio-functionality...
June 14, 2016: Oncotarget
https://www.readbyqxmd.com/read/26986849/copper-complexes-as-catalyst-precursors-in-the-electrochemical-hydrogen-evolution-reaction
#19
Merle Kügler, Julius Scholz, Andreas Kronz, Inke Siewert
Herein, we report the synthesis and species distribution of copper(ii) complexes based on two different ligand scaffolds and the application of the two complexes in the electrochemical proton reduction catalysis. The ligands bind to one or two copper(II) ions and the pH-dependent mono/dinuclear equilibrium depends on the steric bulk of the ligands. The two water soluble copper(II) complexes were investigated for their activities in the electrochemical hydrogen evolution reaction (HER). In both complexes the copper(ii) ions have a N4-coordination environment composed of N-heterocycles, although in different coordination geometries (SPY-5 and TBPY-5)...
April 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/26960565/making-the-hydrogen-evolution-reaction-in-polymer-electrolyte-membrane-electrolysers-even-faster
#20
Jakub Tymoczko, Federico Calle-Vallejo, Wolfgang Schuhmann, Aliaksandr S Bandarenka
Although the hydrogen evolution reaction (HER) is one of the fastest electrocatalytic reactions, modern polymer electrolyte membrane (PEM) electrolysers require larger platinum loadings (∼0.5-1.0 mg cm(-2)) than those in PEM fuel cell anodes and cathodes altogether (∼0.5 mg cm(-2)). Thus, catalyst optimization would help in substantially reducing the costs for hydrogen production using this technology. Here we show that the activity of platinum(111) electrodes towards HER is significantly enhanced with just monolayer amounts of copper...
March 10, 2016: Nature Communications
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