keyword
https://read.qxmd.com/read/38520630/copper-deficiency-anemia-due-to-zinc-supplementation-in-a-chronic-hemodialysis-patient
#1
JOURNAL ARTICLE
Tomoka Watanabe, Satomi Yonemoto, Yoshihiro Ikeda, Kiyotaka Kawaguchi, Tatsuo Tsukamoto
Zinc deficiency causes dysgeusia and dermatitis as well as anemia. As approximately half of dialysis patients have zinc deficiency, zinc supplementation should be considered in case of erythropoiesis-stimulating agent (ESA)-hyporesponsive anemia. We report a case of a chronic dialysis patient with copper deficiency anemia caused by standard-dose zinc supplementation. The patient was a 70-year-old woman who had received maintenance hemodialysis for 8 years due to diabetic nephropathy. She had been treated with weekly administration of darbepoetin 30 μg for renal anemia, which resulted in Hb 12 to 14 g/dL...
March 23, 2024: CEN Case Reports
https://read.qxmd.com/read/38502120/benzene-fused-porphyrin-2-1-2-1-array-synthesis-structure-and-electrocatalytic-hydrogen-evolution
#2
JOURNAL ARTICLE
Yuting Dong, Long Qian, Feng Chen, Yue Wang, Tao Zhang, Fengxian Qiu, Toshiharu Teranishi, Songlin Xue
The development of efficient molecular catalysts for the electrocatalytic hydrogen evolution reaction (HER) is very necessary and important for fuel cells. In this work, we report a new benzene-fused porphyrin(2.1.2.1) array, BPD, with a unique S-shaped molecular conformation. The electrochemistry of BPD displays multielectron donating and accepting properties owing to the two porphyrin(2.1.2.1) blocks and degenerate molecular orbitals. The electrocatalytic HER activity of BPD is remarkably higher-that is, BPD exhibited lower overpotential, faster HER kinetics, faster charge transfer kinetics, and extended catalytic stability-than that of the porphyrin(2...
March 19, 2024: Chemical Communications: Chem Comm
https://read.qxmd.com/read/38483208/copper-based-electrocatalyst-for-hydrogen-evolution-in-water
#3
JOURNAL ARTICLE
Abdullah M Abudayyeh, Michael S Bennington, Johan Hamonnet, Aaron T Marshall, Sally Brooker
In aqueous pH 7 phosphate buffer, during controlled potential electrolysis (CPE) at -1.10 V vs. Ag|AgCl the literature square planar copper complex, [CuII LEt]BF4 (1), forms a heterogeneous deposit on the glassy carbon working electrode (GCWE) that is a stable and effective hydrogen evolution reaction (HER) electrocatalyst. Specifically, CPE for 20 hours using a small GCWE ( A = 0.071 cm2 ) gave a turnover number (TON) of 364, with ongoing activity. During CPE the brownish-yellow colour of the working solution fades, and a deposit is observed on the small GCWE...
March 14, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/38412381/electrochemical-reduction-of-flue-gas-denitrification-wastewater-to-ammonia-using-a-dual-defective-cu-2-o-cu-heterojunction-electrode
#4
JOURNAL ARTICLE
Runlong Hao, Yunchang Song, Longlong Yang, Yongxue Guo, Xuanhao Wu, Zhao Ma, Zhen Qian, Feng Liu, Lidong Wang
Wet flue gas denitrification offers a new route to convert industrial nitrogen oxides (NO x ) into highly concentrated nitrate wastewater, from which the nitrogen resource can be recovered to ammonia (NH3 ) via electrochemical nitrate reduction reactions (NITRRs). Low-cost, scalable, and efficient cathodic materials need to be developed to enhance the NH3 production rate. Here, in situ electrodeposition was adopted to fabricate a foamy Cu-based heterojunction electrode containing both Cu-defects and oxygen vacancy loaded Cu2 O (OVs-Cu2 O), which achieved an NH3 yield rate of 3...
February 27, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38367268/electrocatalytic-hydrogen-evolution-of-immobilized-copper-complex-on-carbonaceous-materials-from-neutral-water-to-seawater
#5
JOURNAL ARTICLE
Chamniphol Taechaworaphong, Methasit Juthathan, Patchanita Thamyongkit, Thawatchai Tuntulani, Pannee Leeladee
Electrochemical hydrogen evolution reaction (HER) is an appealing strategy to utilize renewable electricity to produce green hydrogen. Moreover, the use of neutral pH electrolytes such as water and seawater for the HER has long been desired for eco-friendly energy production that aligns with the net zero emission. Herein, new heterogeneous catalysts were developed by dispersing an HER-active copper complex containing N4-Schiff base macrocycle (CuL) on carbonaceous materials, i.e., multi-walled carbon nanotube (CNT) and graphene oxide (GO), via non-covalent interaction and investigated their HER performance...
February 17, 2024: ChemPlusChem
https://read.qxmd.com/read/38318803/a-full-spectrum-zns-photocatalyst-with-gradient-distribution-of-atomic-copper-dopants-and-concomitant-sulfur-vacancies-for-highly-efficient-hydrogen-evolution
#6
JOURNAL ARTICLE
Linping Bao, Sajjad Ali, Chunhui Dai, Qing Zeng, Chao Zeng, Yushuai Jia, Xin Liu, Ping Wang, Xiaohui Ren, Teng Yang, Mohamed Bououdina, Zhang-Hui Lu, Yuechang Wei, Xuan Yu, Yingtang Zhou
A rarely discussed phenomenon in the realm of photocatalytic materials involves the presence of gradient distributed dopants and defects from the interior to the surface. This intriguing characteristic has been successfully achieved in the case of ZnS through the incorporation of atomic monovalent copper ions (Cu+ ) and concurrent sulfur vacancies (Vs ), resulting in a photocatalyst denoted as G-CZS1- x . Through the cooperative action of these atomic Cu dopants and Vs, G-CZS1- x significantly extends its photoabsorption range to encompass the full spectrum (200-2100 nm), which improves the solar utilization ability...
February 6, 2024: ACS Nano
https://read.qxmd.com/read/38311965/switching-electrocatalytic-hydrogen-evolution-pathways-through-electronic-tuning-of-copper-porphyrins
#7
JOURNAL ARTICLE
Xinyang Peng, Mengchun Zhang, Haonan Qin, Jinxiu Han, Yuhan Xu, Wenzi Li, Xue-Peng Zhang, Wei Zhang, Ulf-Peter Apfel, Rui Cao
The electronic structure of metal complexes plays key roles in determining their catalytic features. However, controlling electronic structures to regulate reaction mechanisms is of fundamental interest but has been rarely presented. Herein, we report electronic tuning of Cu porphyrins to switch pathways of the hydrogen evolution reaction (HER). Throughcontrollable and regioselective β-oxidation of Cu porphyrin 1, we synthesized analogues 2-4 with one or two β-lactone groups in either a cis or trans configuration...
February 4, 2024: Angewandte Chemie
https://read.qxmd.com/read/38269043/the-relevance-of-the-interfacial-water-reactivity-for-electrochemical-co-reduction-on-copper-single-crystals
#8
JOURNAL ARTICLE
Daniel Winkler, Matthias Leitner, Andrea Auer, Julia Kunze-Liebhäuser
The electrochemical reduction of CO2 is an important electrolysis reaction that enables the conversion of a waste gas to fuels or value-added chemicals. To make this reaction viable, a profound understanding of central intermediate steps, such as the CO electroreduction, is required. On Cu, the CO reduction reaction (CORR) is intimately linked to the hydrogen evolution reaction (HER) that proceeds via the reduction of water in alkaline or neutral electrolytes. Here, we demonstrate that the interaction of water or more specifically the water reduction kinetics on differently smooth Cu(100) and Cu(111) surfaces during the CORR in alkaline media significantly governs the CORR...
January 19, 2024: ACS Catalysis
https://read.qxmd.com/read/38244506/exploring-the-synergistic-effect-of-palladium-nanoparticles-and-highly-dispersed-transition-metals-on-carbon-nitride-super-activated-carbon-composites-for-boosting-electrocatalytic-activity
#9
JOURNAL ARTICLE
G Alemany-Molina, M Navlani-García, J Juan-Juan, E Morallón, D Cazorla-Amorós
In the present work, multifunctional electrocatalysts formed by palladium nanoparticles (Pd NPs) loaded on Fe or Cu-containing composite supports, based on carbon nitride (C3 N4 ) and super-activated carbon with a high porosity development (SBET 3180 m2 /g, VDR 1.57 cm3 /g, and VT 1.65 cm3 /g), were synthesised. The presence of Fe or Cu sites favoured the formation of Pd NPs with small average particle size and a very narrow size distribution, which agreed with Density Functional Theory (DFT) calculations showing that the interaction of Pd clusters with C3 N4 flakes is weaker than with Cu- or Fe-C3 N4 sites...
January 11, 2024: Journal of Colloid and Interface Science
https://read.qxmd.com/read/38242870/site-selective-protonation-enables-efficient-carbon-monoxide-electroreduction-to-acetate
#10
JOURNAL ARTICLE
Xinyue Wang, Yuanjun Chen, Feng Li, Rui Kai Miao, Jianan Erick Huang, Zilin Zhao, Xiao-Yan Li, Roham Dorakhan, Senlin Chu, Jinhong Wu, Sixing Zheng, Weiyan Ni, Dongha Kim, Sungjin Park, Yongxiang Liang, Adnan Ozden, Pengfei Ou, Yang Hou, David Sinton, Edward H Sargent
Electrosynthesis of acetate from CO offers the prospect of a low-carbon-intensity route to this valuable chemical--but only once sufficient selectivity, reaction rate and stability are realized. It is a high priority to achieve the protonation of the relevant intermediates in a controlled fashion, and to achieve this while suppressing the competing hydrogen evolution reaction (HER) and while steering multicarbon (C2+ ) products to a single valuable product--an example of which is acetate. Here we report interface engineering to achieve solid/liquid/gas triple-phase interface regulation, and we find that it leads to site-selective protonation of intermediates and the preferential stabilization of the ketene intermediates: this, we find, leads to improved selectivity and energy efficiency toward acetate...
January 19, 2024: Nature Communications
https://read.qxmd.com/read/38234952/unexplained-chronic-liver-disease-and-hemolytic-anemia-in-a-young-girl-a-case-of-wilson-s-disease
#11
Abdul Wahab, Kriti Sapkota, Karthik Jayakumar, Ebad-Ur Rehman Syed, Rooh Ul Amin, Hidayat Ullah, Nauman Khan
Wilson's disease (WD) is an autosomal recessive disorder affecting the metabolism of copper that can present with a variety of clinical symptoms. Low levels of serum copper and ceruloplasmin, increased excretion of copper in the urine, and/or increasing quantities of copper in the liver are diagnostic indicators. The gold standard for diagnosis is genetic testing. The care approach includes the utilization of liver transplants as a therapeutic option in advanced patients and the use of copper-chelating medications...
December 2023: Curēus
https://read.qxmd.com/read/38204353/bifunctional-porphyrin-based-metal-organic-polymers-for-electrochemical-water-splitting
#12
JOURNAL ARTICLE
Neidy Ocuane, Yulu Ge, Christian Sandoval-Pauker, Dino Villagrán
Electrochemical water splitting offers the potential for environmentally friendly hydrogen and oxygen gas generation. Here, we present the synthesis, characterization, and electrochemical analyses of four organic polymers where metalloporphyrins are the active center nodes. These materials were obtained from the polymerization reaction of poly( p -phenylene terephtalamide) (PPTA) with the respective amino-functionalized metalloporphyrins, where M = Fe, 1; Co, 2; Ni, 3; Cu, 4. Scanning and transmission electron microscopy images (SEM and TEM) show that these polymers exhibit a layer-type morphology, which is attributed to hydrogen bonding and π-π stacking between the metalloporphyrin nodes...
January 11, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/38203910/water-splitting-reaction-mechanism-on-transition-metal-fe-cu-sulphide-and-selenide-clusters-%C3%B0-dft-study
#13
JOURNAL ARTICLE
Ellie Uzunova, Ivelina Georgieva, Tsvetan Zahariev
The tetracarbonyl complexes of transition metal chalcogenides M2 X2 (CO)4 , where M = Fe, Co, Ni, Cu and X = S, Se, are examined by density functional theory (DFT). The M2 X2 core is cyclic with either planar or non-planar geometry. As a sulfide, it is present in natural enzymes and has a selective redox capacity. The reduced forms of the selenide and sulfide complexes are relevant to the hydrogen evolution reaction (HER) and they provide different positions of hydride ligand binding: (i) at a chalcogenide site, (ii) at a particular cation site and (iii) in a midway position forming equal bonds to both cation sites...
December 22, 2023: Materials
https://read.qxmd.com/read/38187458/copper-chaperone-for-superoxide-dismutase-subtypes-as-a-prognostic-marker-in-luminal-b-breast-cancer
#14
JOURNAL ARTICLE
Yanping Li, Wenfei Du, Rui Yang, Xiaonan Wei, Haibin Li, Xiaoyuan Zhang
BACKGROUND: Copper chaperone for superoxide dismutase ( CCS ) is an essential component of the oxidation-reduction system. In breast cancer cells, CCS expression is highly up-regulated, which contributes to cellular proliferation and migration. Breast cancer is a multifaceted disease with different tumor prognoses and responses to clinical treatments, which may be associated with multiple molecular subtypes of CCS . METHODS: The CCS expression patterns in breast cancer were investigated by TNMplot, cBioPortal, and HPA network database...
2024: Clinical Medicine Insights. Oncology
https://read.qxmd.com/read/38186081/the-plasmonic-effect-of-cu-on-tuning-co-2-reduction-activity-and-selectivity
#15
JOURNAL ARTICLE
Jing Xue, Zhenlin Chen, Kun Dang, Lei Wu, Hongwei Ji, Chuncheng Chen, Yuchao Zhang, Jincai Zhao
Copper (Cu) has been widely used for catalyzing the CO2 reduction reaction (CO2 RR), but the plasmonic effect of Cu has rarely been explored for tuning the activity and selectivity of the CO2 RR. Herein, we conducted a quantitative analysis on the plasmon-generated photopotential ( E hv ) of a Cu nanowire array (NA) photocathode and found that E hv exclusively reduced the apparent activation energy ( E a ) of reducing CO2 to CO without affecting the competitive hydrogen evolution reaction (HER). As a result, the CO production rate was enhanced by 52...
January 8, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38172222/unfavorable-switching-of-skewed-x-chromosome-inactivation-leads-to-menkes-disease-in-a-female-infant
#16
JOURNAL ARTICLE
Ayumi Matsumoto, Shintaro Kano, Natsumi Kobayashi, Mitsuru Matsuki, Rieko Furukawa, Hirokazu Yamagishi, Hiroki Yoshinari, Waka Nakata, Hiroko Wakabayashi, Hidetoshi Tsuda, Kazuhisa Watanabe, Hironori Takahashi, Takanori Yamagata, Takayoshi Matsumura, Hitoshi Osaka, Harushi Mori, Sadahiko Iwamoto
Menkes disease is an X-linked disorder of copper metabolism caused by mutations in the ATP7A gene, and female carriers are usually asymptomatic. We describe a 7-month-old female patient with severe intellectual disability, epilepsy, and low levels of serum copper and ceruloplasmin. While heterozygous deletion of exons 16 and 17 of the ATP7A gene was detected in the proband, her mother, and her grandmother, only the proband suffered from Menkes disease clinically. Intriguingly, X chromosome inactivation (XCI) analysis demonstrated that the grandmother and the mother showed skewing of XCI toward the allele with the ATP7A deletion and that the proband had extremely skewed XCI toward the normal allele, resulting in exclusive expression of the pathogenic ATP7A mRNA transcripts...
January 3, 2024: Scientific Reports
https://read.qxmd.com/read/38168077/for-zinc-metal-batteries-how-many-electrons-go-to-hydrogen-evolution-an-electrochemical-mass-spectrometry-study
#17
JOURNAL ARTICLE
Kingshuk Roy, Ashutosh Rana, Joseph N Heil, Brian M Tackett, Jeffrey Edward Dick
Despite the advantages of aqueous Zinc (Zn) metal batteries (AZMB), the development of practically relevant batteries is plagued by several issues like unwanted hydrogen evolution reaction (HER), corrosion of Zn substrate (insulating ZnO passivation layer), and dendrite growth. Controlling and suppressing HER strongly correlates with the long-term cyclability of AZMBs. Therefore, a precise quantitative technique is needed to monitor the real-time dynamics of hydrogen evolution during Zn electrodeposition. In this study, we quantify hydrogen evolution using in-situ electrochemical mass spectrometry (ECMS)...
January 2, 2024: Angewandte Chemie
https://read.qxmd.com/read/38149882/hydride-containing-pt-doped-cu-rich-nanoclusters-synthesis-structure-and-electrocatalytic-hydrogen-evolution
#18
JOURNAL ARTICLE
Rhone P Brocha Silalahi, Hao Liang, Yongsung Jo, Jian-Hong Liao, Tzu-Hao Chiu, Ying-Yann Wu, Xiaoping Wang, Samia Kahlal, Qi Wang, Woojun Choi, Dongil Lee, Jean-Yves Saillard, Chen-Wei Liu
A structurally precise hydride-containing Pt-doped Cu-rich nanocluster [PtH2Cu14{S2P(OiPr)2}6(CCPh)6] (1) has been synthesized. It consists of a bicapped icosahedral Cu14 cage that encapsulates a linear PtH2 unit. Upon the addition of two equivalents of CF3COOH to 1, two hydrido clusters are isolated. These clusters are [PtHCu11{S2P(OiPr)2}6(CCPh)4] (2), which is a vertex-missing Cu11 cuboctahedron encaging a PtH moiety, and [PtH2Cu11{S2P(OiPr)2}6(CCPh)3] (3), a distorted 3,3,4,4,4-pentacapped trigonal prismatic Cu11 cage enclosing a PtH2 unit...
December 27, 2023: Chemistry: a European Journal
https://read.qxmd.com/read/38145464/elucidating-the-role-of-atomically-dilute-copper-centers-impregnating-a-phosphamide-polymer-for-the-preferential-hydrogen-evolution-reaction-over-co-2-reduction
#19
JOURNAL ARTICLE
Monika Chaudhary, Mrinal Kanti Adak, Dhananjay, Nidhi Kumari, Avinava Kundu, Hirak Kumar Basak, Tarak Karmakar, Biswarup Chakraborty
Organic polymers have attracted considerable interest in designing a multifunctional electrocatalyst. However, the inferior electro-conductivity of such metal-free polymers is often regarded as a shortcoming. Herein, a nitrogen- and phosphorus-rich polymer with phosphamide functionality (PAP) in the repeating unit has been synthesized from diaminopyridine (DAP) and phenylphosphonic dichloride (PPDC) precursors. The presence of phosphamide oxygen and pyridine nitrogen in the repeating unit of PAP leads to the coordination of the CuII ion and the incorporation of 3...
December 25, 2023: Inorganic Chemistry
https://read.qxmd.com/read/38145264/acute-copper-deficiency-myelopathy-after-single-anastomosis-gastric-bypass
#20
Georgia Taylor, Eshwarshanker Jeyarajan
Bariatric surgery is a well-established treatment for morbid obesity, combining both restrictive and malabsorptive mechanisms to achieve weight loss. Macro and micronutrient deficiencies are some of the most common complications of these operations, which in rare occasions can be unexpected, severe, and difficult to manage. We present a case of severe copper deficiency related myelopathy in a patient post single anastomosis gastric bypass, requiring parenteral copper replacement and eventual reversal. She presented with ascending lower limb paraesthesia and weakness, with copper levels on admission of 4 μmol/l, and ceruloplasmin 94 mg/l...
December 2023: Oxford Medical Case Reports
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