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Marques Mota, Filipe,Choi, Chi Hun,Boppella, Ramireddy,Lee, Ji-Eun,Kim, Dong Ha The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.2
<P>In the development of water splitting technologies, the design of hybrid architectures incorporating multiple phases which provide active centers with precise functionalities is a promising strategy. Herein, we report the design of Ni- and Ru-based electrocatalysts within a wide Ni/Ru ratio range, prepared through a one-step heat treatment of ultra-thin ruthenate nanosheets and NiCl2·6H2O and NaH2PO2·H2O precursors. At 250 °C under an argon flow, a pristine Ru electrode was shown to undergo preferential ruthenate-to-metallic Ru phase transformation, revealing preferable hydrogen evolution reaction (HER) fingerprints. At low Ni/Ru ratios, the interaction between the Ni<SUP>2+</SUP> ions and the negatively charged ruthenate favored the <I>in situ</I> growth of highly dispersed surface Ni-based moieties below 5 nm in diameter. XPS measurements confirmed, however, that these narrow moieties were swiftly oxidized to NiO, whereas larger Ni-based agglomerates at higher Ni/Ru ratios were less prone to oxidation. This size-dependent propensity of Ni2P moieties toward oxidation, reported here for the first time, agrees with the surface oxidation of Ni2P nanoparticles (50-100 nm) to a limited extent. At Ni/Ru = 0.36, the incorporated NiO favored a synergistically superior oxygen evolution reaction (OER) performance and an optimal 1.7-fold activity enhancement at limiting current densities. An antagonistic effect in the HER performance of these hybrid materials was, nonetheless, simultaneously observed and ascribed to the blockage of the active Ru surface. While the performance of these nano-architectures remains a modest addition to the current state-of-the-art of water splitting platforms in alkaline electrolyte media, our results primarily reveal representative bottlenecks in the integration of multiple phases during synthesis steps and the effects of arising between integrated components on the catalytic behavior of resulting hybrids.</P>
Cone-beam computed tomography findings of impacted upper canines
Ludmilla Mota da Silva Santos,Luana Costa Bastos,Christiano Oliveira-Santos,Silvio José Albergaria da Silva,Frederico Sampaio Neves,Paulo Sérgio Flores Campos 대한영상치의학회 2014 Imaging Science in Dentistry Vol.44 No.4
Purpose: To describe the features of impacted upper canines and their relationship with adjacent structures through three-dimensional cone-beam computed tomography (CBCT) images. Materials and Methods: Using the CBCT scans of 79 upper impacted canines, we evaluated the following parameters: gender, unilateral/bilateral occurrence, location, presence and degree of root resorption of adjacent teeth (mild, moderate, or severe), root dilaceration, dental follicle width, and presence of other associated local conditions. Results: Most of the impacted canines were observed in females (56 cases), unilaterally (51 cases), and at a palatine location (53 cases). Root resorption in adjacent teeth and root dilaceration were observed in 55 and 47 impacted canines, respectively. In most of the cases, the width of the dental follicle of the canine was normal; it was abnormally wide in 20 cases. A statistically significant association was observed for all variables, except for root dilaceration (p=0.115) and the side of impaction (p=0.260). Conclusion: Root resorption of adjacent teeth was present in most cases of canine impaction, mostly affecting adjacent lateral incisors to a mild degree. A wide dental follicle of impacted canines was not associated with a higher incidence of external root resorption of adjacent teeth.
Catia Mota,Kiseung Kim,Eun Jung Thak,Su-Bin Lee,Hyun Ah Kang 한국당과학회 2022 한국당과학회 학술대회 Vol.2022 No.07
To guarantee proper glycoprotein folding, eukaryotes evolved a highly conserved N-glycan-dependent endoplasmic reticulum quality control mechanism (ERQC). In the ER, glycoprotein conformations are sensed by UDP-glucose: glycoprotein glucosyltransferase (UGGT), which selectively re-glycosylates misfolded glycoproteins for re-binding to the folding chaperones. ER-resident α-1,2-mannosidase I (MNS1) trims one mannose residue from the B branch of core N-oligosaccharides, initiating the formation of the molecular signals that either lead folded proteins towards the Golgi apparatus, or direct misfolded glycoproteins towards degradation. In this study, we investigated the molecular assembly and function of N-glycan-dependent ERQC in the human fungal pathogen Cryptococcus neoformans, which has a unique N-glycosylation pathway lacking glucosyltransferases but carrying multiple mannosidases. We constructed and functionally analyzed the C. neoformans mutant strains lacking UGGT (uggtΔ), MNS1A (mns1AΔ) and MNS1B (mns1BΔ). The uggtΔ mutant displayed reduced growth rates with aggregated forms, increased stress sensitivity, and induced the unfolded protein response even in the absence of exogenous ER stress. The mns1AΔ and mns1BΔ showed altered N-glycan profiles, indicating that whereas MNS1A acts as the widely known ER-α1,2-mannosidase I, MNS1B appears to be a novel mannosidase involved in mannose processing in the Golgi. Simultaneous deletion of MNS1A and MNS1B (mns1AΔ1BΔ) displayed mild growth retardation under several stress conditions. Moreover, qRT-PCR analysis of UGGT, MNS1A and MNS1B mRNA levels revealed that these genes were up-regulated upon DTT treatment, indicating these genes are essential upon ER stress induced by the presence of misfolded proteins. Notably, the uggtΔ mutant and the mns1AΔ1BΔ double mutant strains commonly displayed defects in capsule formation, which might contribute to a decrease in survival inside phagocytic cells and to avirulence in a murine model. Altogether, our data demonstrates the evolutionary unique C. neoformans N-glycan-dependent ERQC plays critical roles in cellular fitness under adverse conditions of the host environment, required for full fungal pathogenicity.
( Filipe Marques Mota ),( Dang Nguyen ),이지은,( Huiyan Piao ),( Jin-ho Choy ),황윤정,김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The electroreduction of CO<sub>2</sub> has emerged as a rational answer to uprising CO<sub>2</sub> emissions and a strategy to incorporate renewable electricity into the global energy supply. In particular, CO<sub>2</sub>RR to CO has been highlighted in the industrial conversion of syngas (H<sub>2</sub> and CO) to fuels through subsequent technologies. Here we report for the first time a strategy to tune the H<sub>2</sub> to CO ratio by facile composition control of the components of a rationally designed binary nanostructure. By adjusting the loading of Au nanoparticles immobilized on ultra-thin titanate nanosheets in a 0 to 93 wt.% range, the CO Faradaic efficiency balanced by exclusive H<sub>2</sub> formation could be effectively varied in a 3 to 80% range. A variation of the electronic properties of these nanostructures, corroborated by XPS characterization, was proposed to dictate the stabilization of formed reaction intermediates and subsequent product selectivity.
( Filipe Marques Mota ),김동하 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Tuning the bifunctional water splitting fingerprints toward H<sub>2</sub> and O<sub>2</sub> evolution through the design of architectures incorporating multiple functionalities is of increasing attention. Here, Ni- and Ru-based electrocatalysts with increasing Ni/Ru content ratios were designed through a one-step heat treatment at 250°C of ruthenate nanosheets, and NiCl<sub>2</sub>6H<sub>2</sub>O and NaH<sub>2</sub>PO<sub>2</sub>H<sub>2</sub>O precursors, under argon flow. XPS measurements confirmed that incorporated narrow Ni-based moieties on the surface of the ruthenium substrate were swiftly oxidized to NiO, whereas larger Ni-based agglomerates at higher Ni/Ru ratios were less prone to oxidation. This size-dependent propensity of Ni<sub>2</sub>P to oxidation was here reported for the first time and shown to directly determine the OER performance of the resulting hybrids. Our results reflect the difficulty in the integration of multiple phases during the synthesis procedure and its effect on resulting catalytic behaviors.
( Filipe Marques Mota ),변혜령,김동하 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Rechargeable Li-air cells operating under CO<sub>2</sub> or O<sub>2</sub>/CO<sub>2</sub> offer alternative mechanistic pathways with analogously high theoretical energy density. The Li-O<sub>2</sub>/CO<sub>2</sub> cell in tetraglyme electrolyte suffers from recharge potentials at ~4.5 V required for the decomposition of the main discharge product, Li<sub>2</sub>CO<sub>3</sub>. In this work we assess the promise of incorporating a Br<sub>3</sub><sup>-</sup>/Br<sub>2</sub> redox promoter. Hindered overcharges (~0.5 V) driven by electrochemically-generated Br<sub>2</sub> are revealed to be a function of the LiBr concentration and the insulating Li<sub>2</sub>CO<sub>3</sub> structure. Coupled electrochemical and spectroscopic analyses at progressive states-of-charge are proposed as a seminal methodology to dissect the underlying complexity of involved redox shuttling steps and evaluate the appropriateness of redox mediators beyond an overcharge decrease.
( Filipe Marques Mota ),변혜령,김동하 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Reflecting the languished research state of Li-O<sub>2</sub>, alternative devices operating under CO<sub>2</sub> or O<sub>2</sub>/CO<sub>2</sub> with analogously high theoretical energy density have gained recent attraction. Here, we assess the effect of CO<sub>2</sub> within a 5 to 100% range in Li-O<sub>2</sub>/CO<sub>2</sub>. In the LiTFSI/tetraglyme electrolyte, the reaction mechanism is swiftly shifted toward the formation of Li<sub>2</sub>CO<sub>3</sub> even at 5% CO<sub>2</sub>. Conspicuous product and intermediate species identification and quantification are presented. Tuning the CO<sub>2</sub> content is shown to offer superior cyclability, deterred byproduct formation with enhanced electrolyte stability, and extended discharge capacity (1.5-fold), correlated with an induced stabilization of metastable CO<sub>4</sub><sup>-</sup>/C<sub>2</sub>O<sub>6</sub><sup>2-</sup> intermediates in tetraglyme. These findings highlight the promise of a shift in the underlying mechanism of Li-air cells upon CO<sub>2</sub> incorporation on conventional O<sub>2</sub>-based devices.