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#38648668 
2024/04/22
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Topological Defect-regulated Porous Carbon Anodes with fast Interfacial and Bulk Kinetics for High-rate and High-energy-density Potassium-ion Batteries.
Carbonaceous materials are regarded as one of the most promising anodes for potassium-ion batteries (PIBs), but their rate capabilities have been largely limited by the slow solid-state potassium diffusion kinetics inside anode and sluggish interfacial potassium ion transfer process. Herein, high-rate and high-capacity PIBs have been demonstrated by facile topological defect-regulation of the microstructure of carbon anodes. The carbon lattice of the as-obtained porous carbon nanosheets with abundant topological defects (TDPCNSs) holds high potassium adsorption energy yet low potassium migration barrier, thereby enabling efficient storage and diffusion of potassium inside graphitic layers. Moreover, the topological defects can induce preferential decomposition of anions, leading to the formation of high potassium ion conductive solid electrolyte interphase (SEI) film with decreased potassium ion de-solvation and transfer barrier. Additionally, the dominant sp-hybridized carbon conjugated skeleton of TDPCNSs enables high electrical conductivity (39.4 S cm) and relatively low potassium storage potential. As a result, the as-constructed TDPCNSs anode demonstrates high potassium storage capacity (504 mA h g at 0.1 A g), remarkable rate capability (118 mA h g at 40 A g) as well as long-term cycling stability. This article is protected by copyright. All rights reserved.Junlong Huang, Yongqi Chen, Zongheng Cen, Tan Yi, Min Liang, Youlong Zhu, Ruliang Liu, Ruowen Fu, Shaohong Liu, Dingcai Wu
2769 related Products with: Topological Defect-regulated Porous Carbon Anodes with fast Interfacial and Bulk Kinetics for High-rate and High-energy-density Potassium-ion Batteries.
100ug Lyophilized4 Sample Kit100ug Lyophilized
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#38648554 2024/04/22
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Experimental Identification of Potential Martian Biosignatures in Open and Closed Systems.
NASA's Perseverance and ESA's Rosalind Franklin rovers have the scientific goal of searching for evidence of ancient life on Mars. Geochemical biosignatures that form because of microbe-mineral interactions could play a key role in achieving this, as they can be preserved for millions of years on Earth, and the same could be true for Mars. Previous laboratory experiments have explored the formation of biosignatures under closed systems, but these do not represent the open systems that are found in natural martian environments, such as channels and lakes. In this study, we have conducted environmental simulation experiments using a global regolith simulant (OUCM-1), a thermochemically modelled groundwater, and an anaerobic microbial community to explore the formation of geochemical biosignatures within plausible open and closed systems on Mars. This initial investigation showed differences in the diversity of the microbial community developed after 28 days. In an open-system simulation (flow-through experiment), the acetogenic (49% relative abundance) and the sulfate reducer (43% relative abundance) were the dominant genera. Whereas in the batch experiment, the sulfate reducers and (95% relative abundance in total) were dominant. We also found evidence of enhanced mineral dissolution within the flow-through experiment, but there was little evidence of secondary deposits in the presence of biota. In contrast, SiO and Fe deposits formed within the batch experiment with biota but not under abiotic conditions. The results from these initial experiments indicate that different geochemical biosignatures can be generated between open and closed systems, and therefore, biosignature formation in open systems warrants further investigation.Nisha K Ramkissoon, Michael C Macey, Ezgi Kucukkilic-Stephens, Timothy Barton, Andrew Steele, David N Johnson, Ben P Stephens, Susanne P Schwenzer, Victoria K Pearson, Karen Olsson-Francis
3000 related Products with: Experimental Identification of Potential Martian Biosignatures in Open and Closed Systems.
25mg100ug100 μg100ug Lyophilized100ug Lyophilized100 μg10 100ug100 μg
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#38648553 2024/04/22
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Effect of Elamipretide on the Vitrification of Mouse Ovarian Tissue by Freezing.
TXingfeng Yao, Qingfang Lu, Yuyin Wu, Juan Liu, Niang Liu, Xiling Huang, Changlong Xu
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5 G
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#38648414 2024/03/23
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Clinical and laboratory profile of Expanded Dengue Syndrome: experience of 2019 outbreak from Dhaka, Bangladesh.
Bangladesh is afflicted with periodic dengue outbreak every few years and one of the worst upsurges was recorded in 2019 during which there was an increasing trend of dengue with unusual symptoms which were not so common before. This study aims to describe the experience of three tertiary care centres of Dhaka regarding the clinical and laboratory, hospital outcome and management profile of the Expanded Dengue Syndrome (EDS) cases admitted from the 2019 outbreak.Zazeba Hossain, Forhad U Chowdhury, Mohammad A Bari, Sudip R Deb, Ujjwal Mallik, Sakib Aman, Mohammad A Haque, Syeda S Ahmed, Waild Mohammad, Afsan Bulbul, Md Arman Hossain, Murada Alam, Muhammad K Islam, Umma Salma, Md Mujibur Rahman, Fazle R Chowdhury
2960 related Products with: Clinical and laboratory profile of Expanded Dengue Syndrome: experience of 2019 outbreak from Dhaka, Bangladesh.
5 G1 mL1000 1 g
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#38647933 2024/01/23
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In vitro study on antioxidant and lipid-lowering activities of tobacco polysaccharides.
Tobacco polysaccharides were extracted by hot water extraction, and purified and separated using DEAE-52 cellulose chromatography columns, and three purified polysaccharide fractions, YCT-1, YCT-2, and YCT-3, were finally obtained. The physicochemical properties of the three fractions were analyzed by ultraviolet spectroscopy, high-performance liquid chromatography and high-performance gel chromatography. The in vitro antioxidant activity of tobacco polysaccharides was compared among different fractions by using DPPH radical, hydroxyl radical scavenging assay and potassium ferricyanide method. The in vitro hypoglycemic activity was compared using α-amylase and α-glucosidase activity inhibition assay. And the in vitro hypolipidemic activity were investigated by using pancreatic lipase activity inhibition assay and HepG-2 intracellular lipid accumulation assay. All the results showed that the constituent monosaccharides of the three tobacco polysaccharide fractions were similar, but the molar percentages of each monosaccharide were different. The average molecular weights of the three components were 27,727 Da, 27,587 Da, and 66,517 Da, respectively, and the scavenging activities on DPPH radicals and hydroxyl radicals were at a high level with good quantitative-effect relationships. The reducing power were much lower than that of the positive control VC, and the three polysaccharide fractions had a weak inhibitory ability on α-amylase activity, but showed excellent inhibitory ability on α-glucosidase and pancreatic lipase activity. In addition, the results of cellular experiments showed that all three fractions were able to inhibit lipid over-accumulation in HepG-2 cells by increasing the mRNA expression levels of PPAR-α, CPT-1A, and CYP7A1 genes, and the tobacco polysaccharide YCT-3 showed the best effect. The mechanism by which YCT-3 ameliorated the over-accumulation of intracellular lipids in HepG-2 cells was found to be related to its influence on the expression of miR-155-3p and miR-17-3p in the exosomes of HepG-2 cells.Shuaishuai Chang, Xiao Lei, Qiang Xie, Mingjin Zhang, Yuangai Zhang, Jiaxin Xi, Jiyou Duan, Jian Ge, Fuzhao Nian
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50 ug1mg10mg96 tests100ug25 1 Set1 Set
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#38647439 //
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On being unpredictable and winning.
In theory, it can be strategically advantageous for competitors to make themselves unpredictable to their opponents, for example, by variably mixing hostility and friendliness. Empirically, it remains open whether and how competitors make themselves unpredictable, why they do so, and how this conditions conflict dynamics and outcomes. We examine these questions in interactive attacker-defender contests, in which attackers invest to capture resources held and defended by their opponent. Study 1, a reanalysis of nine (un)published experiments (total N = 650), reveals significant cross-trial variability especially in proactive attacks and less in reactive defense. Study 2 (N = 200) shows that greater variability makes both attacker's and defender's next move more difficult to predict, especially when variability is due to occasional rather than (in)frequent extreme investments in conflict. Studies 3 (N = 27) and 4 (N = 106) show that precontest testosterone, a hormone associated with risk-taking and status competition, drives variability during attack which, in turn, increases sympathetic arousal in defenders and defender variability (Study 4). Rather than being motivated by wealth maximization, being unpredictable in conflict and competition emerges in function of the attacker's desire to win "no matter what" and comes with significant welfare cost to both victor and victim. (PsycInfo Database Record (c) 2024 APA, all rights reserved).Carsten K W De Dreu, Jörg Gross, Andrea Arciniegas, Laura C Hoenig, Michael Rojek-Giffin, Daan T Scheepers