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https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#1
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786966/controlled-selectivity-of-co-2-reduction-on-copper-by-pulsing-the-electrochemical-potential
#2
Kevin W Kimura, Kevin E Fritz, Jiyoon Kim, Jin Suntivich, Héctor D Abruña, Tobias Hanrath
We demonstrate a simple strategy to enhance the CO2 reduction reaction (CO2 RR) selectivity by applying a pulsed electrochemical potential to a polycrystalline copper electrode. By controlling the pulse duration, we show that the hydrogen evolution reaction (HER) is highly suppressed to a fraction of the original value (<5 % faradaic efficiency) and selectivity for the CO2 RR dramatically improves (>75 % CH4 and >50 % CO faradaic efficiency). We attribute the improved CO2 RR selectivity to a dynamically rearranging surface coverage of hydrogen and intermediate species during the pulsing...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786935/evaluation-of-pcr-primers-targeting-the-groel-gene-for-the-specific-detection-of-streptococcus-agalactiae-in-the-context-of-aquaculture
#3
W J Leigh, R N Zadoks, A Jaglarz, J Z Costa, G Foster, K D Thompson
AIMS: The aim of this study was to design a set of primers for specific detection and identification of Streptococcus agalactiae in polymerase chain reaction (PCR) that can detect a diverse range of S. agalactiae isolates from different hosts and that it is capable of discriminating between S. agalactiae and other species that are closely related or potentially present in aquaculture environments, notably Streptococcus iniae. METHODS AND RESULTS: Primers, based on the groEL2 gene of S...
May 22, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29786933/acute-generalized-exanthematous-pustulosis-due-to-terbinafine
#4
Casey L Ross, Alina Shevchenko, Nicholas K Mollanazar, Sylvia Hsu, Kiran Motaparthi
Acute generalized exanthematous pustulosis is a rare adverse cutaneous reaction characterized by the rapid appearance of numerous pustules arising on edematous, erythematous skin. It is commonly accompanied by fever and leukocytosis and usually resolves with discontinuation of the offending agent. Herein, acute generalized exanthematous pustulosis induced by terbinafine is described, followed by a brief review of the literature.
May 21, 2018: Dermatologic Therapy
https://www.readbyqxmd.com/read/29786930/an-unexpected-%C3%AE-oxidation-of-cyclic-ketones-with-1-4-benzoquinone-via-enol-catalysis
#5
Benjamin List, Grigory A Shevchenko, Barry Oppelaar
The single electron oxidation of enamines is a well-established activation mode for organocatalytic enantioselective α-functionalizations of simple aldehydes and ketones.[1] Due to the intrinsic limitations of enamine catalysis, the oxidation of the corresponding α-branched ketones has so far not been reported. Herein we disclose the first direct and asymmetric α-aryloxylation of cyclic ketones via enol catalysis, using quinones as the reaction partner. Catalytic amounts of a phosphoric acid promote the exclusive formation of α,α-disubstituted ketones from the corresponding α-substituted ketones in good yields and enantioselectivities (up to 96...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786915/reversible-oxidative-addition-reductive-elimination-of-si-h-bond-to-base-stabilized-silylenes-a-theoretical-insight
#6
Tsuyoshi Kato, Masayuku Nakagaki, Antoine Baceiredo, Shigeyoshi Sakaki
Although oxidative addition (O.A.) and reductive elimination (R.E.) are exceedingly important processes in organometallic chemistry, such processes are still extremely rare for main group element species. Here we report a theoretical study on the reaction of phosphine-stabilized silylenes with silanes which proceeds via reversible O.A./R.E. at room temperature. Of particular interest, this theoretical approach highlights the important role of the ligand, which can greatly affect kinetics and energy balance of the reaction...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786906/reversible-c-h-activation-facile-b-c-b-h-metathesis-and-apparent-hydroboration-catalysis-by-a-xanthene-based-frustrated-lewis-pair
#7
Petra Vasko, Ili A Zulkifly, M Ángeles Fuentes, Zhenbo Mo, Jamie Hicks, Paul C J Kämer, Simon Aldridge
A dimethylxanthene-based phosphine/borane frustrated Lewis pair (FLP) is shown to effect reversible C-H activation, cleaving phenylacetylene, PhCCH, to give an equilibrium mixture of the free FLP and phosphonium acetylide in CD₂Cl₂ solution at room temperature. This system also reacts with B-H bonds although in a different fashion: reactions with HBpin and HBcat proceed via C-B/B-H metathesis, leading to replacement of the -B(C₆F₅)₂ Lewis acid component by -Bpin/-Bcat, and transfer of HB(C₆F₅)₂ to the phosphine Lewis base...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786903/copper-catalyzed-allylic-c-h-alkynylation-via-cross-dehydrogenative-coupling
#8
Ahmad A Almasalma, Esteban Mejía
C-H bond functionalization is a well-developed concept that has been thoroughly studied and gives entry to rather complex molecules without the need of previous derivatization of the substrates, although the use of copper complexes for allylic C-H bond functionalization under oxidative conditions as an alternative to the well-established palladium-based methodologies remains largely underdeveloped. Here we show for the first time a selective cross-dehydrogenative coupling reaction between underivatized allylic substrates and terminal alkynes to produce 1,4-enynes in high yields in a single step, using an in situ synthesized copper catalyst and an oxidant...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786887/perovskite-solar-cells-with-inorganic-electron-and-hole-transport-layers-exhibiting-long-term-%C3%A2-500-h-stability-at-85-%C3%A2-c-under-continuous-1-sun-illumination-in-ambient-air
#9
Seongrok Seo, Seonghwa Jeong, Changdeuck Bae, Nam-Gyu Park, Hyunjung Shin
Despite the high power conversion efficiency (PCE) of perovskite solar cells (PSCs), poor long-term stability is one of the main obstacles preventing their commercialization. Several approaches to enhance the stability of PSCs have been proposed. However, an accelerating stability test of PSCs at high temperature under the operating conditions in ambient air remains still to be demonstrated. Herein, interface-engineered stable PSCs with inorganic charge-transport layers are shown. The highly conductive Al-doped ZnO films act as efficient electron-transporting layers as well as dense passivation layers...
May 22, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29786830/blue-light-filtering-intraocular-lenses-iols-for-protecting-macular-health
#10
REVIEW
Laura E Downie, Ljoudmila Busija, Peter R Keller
BACKGROUND: An intraocular lens (IOL) is a synthetic lens that is surgically implanted within the eye following removal of the crystalline lens, during cataract surgery. While all modern IOLs attenuate the transmission of ultra-violet (UV) light, some IOLs, called blue-blocking or blue-light filtering IOLs, also reduce short-wavelength visible light transmission. The rationale for blue-light filtering IOLs derives primarily from cell culture and animal studies, which suggest that short-wavelength visible light can induce retinal photoxicity...
May 22, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29786812/the-microrna-expression-profile-in-rat-lung-tissue-early-after-burn-injury
#11
Donghai Zhang, Yang Chang, Shaofang Han, Longlong Yang, Quan Hu, Yonghui Yu, Lingying Liu, Jiake Chai
BACKGROUND: Severe burn causes acute lung injury in many victims, but the related mechanisms have been barely investigated. microRNAs (miRNAs) important regulators in numerous physiological and pathophysiological process. However, the roles of miRNAs in burn lung injury are untested. METHODS: Six healthy male Sprague-Dawley rats were randomly assigned into burn and sham groups. Lung injury was evaluated by hematoxylin and eosin (HE) staining at 24 h after injury...
May 2018: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/29786752/overexpression-of-mir%C3%A2-17%C3%A2-5p-protects-against-high-glucose%C3%A2-induced-endothelial-cell-injury-by-targeting-e2f1%C3%A2-mediated-suppression-of-autophagy-and-promotion-of-apoptosis
#12
Yifeng Yuan, Xue Li, Maoquan Li
E2 promoter binding factor 1 (E2F1) has been reported to have an important regulatory role in cell survival during hyperglycemic conditions; however, the mechanisms remain to be fully elucidated. Bioinformatics analyses have suggested that microRNA (miR)‑17‑5p targets the 3'untranslated region (3'UTR) of E2F1. The aim of the present study was to characterize the protective effect of miR‑17‑5p/E2F1 on human umbilical vein endothelial cells (HUVECs) under high glucose (HG) conditions, to confirm the regulatory effect of miR‑17‑5p on E2F1/AMP‑activated protein kinase α2 (AMPKα2)‑mediated apoptosis and E2F1/mammalian target of rapamycin complex 1 (mTORC1)‑mediated autophagy...
May 21, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29786750/microrna%C3%A2-20b%C3%A2-5p-promotes-ventricular-remodeling-by-targeting-the-tgf%C3%A2-%C3%AE-smad-signaling-pathway-in-a-rat-model-of-ischemia%C3%A2-reperfusion-injury
#13
Zhao-Guang Liang, Hong Yao, Rong-Sheng Xie, Chun-Lin Gong, Ye Tian
Myocardial ischemic injury results from severe impairment of the coronary blood supply and may lead to metabolic and ultrastructural changes, thereby causing irreversible damage. MicroRNA (miR)‑20b‑5p has been demonstrated to be involved in malignancies of the breast, colorectum, stomach, blood and oropharynx. The present study aimed to investigate the effects of miR‑20b‑5p on ventricular remodeling following myocardial ischemia‑reperfusion (IR) injury in rats by targeting small mothers against decapentaplegic homolog 7 (Smad7) via the transforming growth factor‑β (TGF‑β)/Smad signaling pathway...
May 18, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29786749/long-noncoding-rna-myocardial-infarction%C3%A2-associated-transcript-is-associated-with-the-microrna%C3%A2-150%C3%A2-5p-p300-pathway-in-cardiac-hypertrophy
#14
Zhao Li, Yamin Liu, Xiaofan Guo, Guozhe Sun, Qun Ma, Ying Dai, Guangshuo Zhu, Yingxian Sun
In numerous diseases, abnormal expression of myocardial infarction‑associated transcript (MIAT) has been reported to be involved in cell proliferation, apoptosis and migration. However, whether this long non‑coding RNA MIAT has a regulatory effect on heart hypertrophy requires further investigation. To this end, the present study evaluated MIAT in hypertrophic cardiomyocytes in vitro and in vivo. Neonatal rat ventricular myocytes (NRVMs) were induced by isoproterenol (ISO) to create a cell hypertrophy model, and mice were intraperitoneally injected with ISO to establish an animal model...
May 21, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29786744/mir%C3%A2-133b-regulates-proliferation-and-apoptosis-in-high%C3%A2-glucose%C3%A2-induced-human-retinal-endothelial-cells-by-targeting-ras-homolog-family-member-a
#15
Jun Yao, Jihong Wang, Yong Yao, Kelei Wang, Qianqian Zhou, Ying Tang
The aim of the present study was to investigate the role of microRNA (miR)‑133b in high‑glucose‑induced human retinal endothelial cells (hRECs), particularly regarding its potential targeting of ras homolog family member A (RhoA). To establish the high‑glucose‑induced diabetic retinopathy (DR) model, hRECs were cultured in high‑glucose medium for 1, 2 and 3 days. An Annexin allophycocyanin (APC)/7‑aminoactinomycin D (7‑AAD) staining assay was performed to measure the apoptosis of hRECs. Next, the cells were transfected with miR‑133b inhibitors or mimics, and the cell proliferation and apoptosis were measured by MTT and Annexin‑APC/7‑AAD staining assays, respectively...
May 18, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29786741/halo-substituted-benzenesulfonyls-and-benzenesulfinates-convenient-sources-of-arenes-in-metal-catalyzed-c-c-bond-formation-reactions-for-the-straightforward-access-to-halo-substituted-arenes
#16
REVIEW
Haoran Li, Arpan Sasmal, Xinzhe Shi, Jean-François Soulé, Henri Doucet
Palladium-catalyzed reactions using aryl halides as one of the coupling partners represent a very popular method for generating carbon-carbon bonds. However, such couplings suffer from important limitations. As most palladium catalysts are very effective for the cleavage of C-halo bonds (Halo = Cl, Br or I), in many cases, the presence of several halide functional groups on arenes is not tolerated. Since two decades, and especially during the last few years, a new class of coupling partners, benzenesulfonyl and benzenesulfinate derivatives, has emerged as a powerful alternative to aryl halides for the Pd-catalyzed C-C bond formation, as the reactions performed with these substrates generally tolerate C-halo bonds...
May 22, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29786735/solvent-induced-ion-separation-of-a-beryllium-scorpionate-complex
#17
Dominik Naglav, Briac Tobey, Kevin Dzialkowski, Dieter Bläser, Christoph Wölper, Georg Jansen, Stephan Schulz
Spontaneous ion separation of the scorpionate beryllium complex, TpBeI 1 (Tp = 1-trispyrazolylborate), occurs upon treatment with THF, yielding [TpBe(thf)]I 2, which was characterized by heteronuclear NMR spectroscopy (1H, 9Be, 13C) and structurally characterized by single crystal X-ray diffraction. 2 represents a rare example of a structurally characterized monocationic beryllium complex, and to the best of our knowledge, the synthesis of 2 by a solvent-induced ion separation has previously only been observed in the reactions of beryllium dihalides with strong Lewis bases...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29786733/a-facet-controlled-rh-3-pb-2-s-2-nanocage-as-an-efficient-and-robust-electrocatalyst-toward-the-hydrogen-evolution-reaction
#18
Taekyung Kim, Jongsik Park, Haneul Jin, Aram Oh, Hionsuck Baik, Sang Hoon Joo, Kwangyeol Lee
Highly active and durable electrocatalysts for the hydrogen evolution reaction (HER) may play a pivotal role in commercial success of electrolytic water splitting technology. Among various material classes, binary metal sulphides show a great promise as HER catalysts because of their tunable energy levels conducive to a high catalytic activity and high robustness under harsh operating conditions. On the other hand, facet-controlled nanoparticles with controlled surface energies have gained great recent popularity as active and selective catalysts...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786731/regioselective-and-diastereoselective-synthesis-of-two-functionalized-1-5-methanoindeno-1-2-d-azocines-via-a-three-component-reaction
#19
Jun Cao, Jing Sun, Chao-Guo Yan
The morpholine promoted three-component reaction of N-alkylpiperidinone, indane-1,3-dione and 2-arylideneindane-1,3-dione in ethanol at room temperature resulted in the (1H-1,5-methanoindeno[1,2-d]azocin-12-ylidene)-1H-indene-1,3(2H)-dione derivatives in good yields and with exo-configuration. Under similar conditions, the reaction of N-alkylpiperidinone with 2-arylideneindane-1,3-dione afforded 7H-1,5-methanoindeno[1,2-d]azocine-7,12-diones with endo-configuration. The domino reaction is believed to proceed with domino Knoevenagel condensation, Michael addition and aldol condensation reaction...
May 22, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29786728/selenization-of-nimn-layered-double-hydroxide-with-enhanced-electrocatalytic-activity-for-oxygen-evolution
#20
Jing Du, Zehua Zou, Ailing Yu, Cailing Xu
Exploiting highly active oxygen evolution reaction electrocatalysts is of great importance in the cost-effective generation of clean fuels. Herein, the preparation of NiMn-layered double hydroxide with selenization is adopted to reduce the charge transfer resistance of the electrocatalytic oxygen evolution reaction and enhance electrocatalytic performance. As a result, this selenization product of NiMn-layered double hydroxide can reach a current density of 10 mA cm-2 at a low overpotential of 280 mV on glassy carbon electrode in 1...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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