transport channels
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Author(s):  
Eduardo Carrillo-Aravena ◽  
Kati Finzel ◽  
Rajyavardhan Ray ◽  
Manuel Richter ◽  
Tristan Heider ◽  
...  

RSC Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 517-527
Author(s):  
Qingping Xin ◽  
Meixue Zhao ◽  
Jianping Guo ◽  
Dandan Huang ◽  
Yinan Zeng ◽  
...  

New light-responsive MOF sheets were synthesized to fabricate a smart membrane, which displays switchable gas separation performance stimulated with UV-Vis light.


Author(s):  
Pengjun Zhang ◽  
Changda Wang ◽  
Shiqiang Wei ◽  
Hongwei Shou ◽  
Kefu Zhu ◽  
...  

2021 ◽  
Author(s):  
Liushun Wang ◽  
Dong Li ◽  
Yulan Zhou ◽  
Shaohua Fu ◽  
Yuehua Peng ◽  
...  

Abstract The transport and storage of ions within solid state structures is a fundamental limitation for fabricate more advanced electrochemical energy storage, memristor, and electrochromic devices. Crystallographic shear structure can be induced in the tungsten bronze structures composed of corner-sharing WO6 octahedra by the addition of edge-sharing NbO6 octahedra, which might provide more storage sites and more convenient transport channels for external ions such as hydrogen ions and alkali metal ions. Here, we show that Nb2O5·15WO3 nanowires with long length-diameter ratio, smooth surface, and uniform diameter have been successfully synthesized by a simple hydrothermal method. The Nb2O5·15WO3 nanowires do exhibit more advantages over h-WO3 nanowires in electrochemical hydrogen ion storage such as smaller polarization, larger capacity(71 mAh/g, at 10C, 1C = 100 mA/g), better cycle performance (remain at 99% of the initial capacity after 200 cycles at 100C) and faster H+ diffusion kinetics. Therefore, complex niobium tungsten oxide nanowires might offer great promise for the next generation of hydrogen ion batteries.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Alina Ornik-Cha ◽  
Julia Wilhelm ◽  
Jessica Kobylka ◽  
Hanno Sjuts ◽  
Attilio V. Vargiu ◽  
...  

AbstractUpon antibiotic stress Gram-negative pathogens deploy resistance-nodulation-cell division-type tripartite efflux pumps. These include a H+/drug antiporter module that recognizes structurally diverse substances, including antibiotics. Here, we show the 3.5 Å structure of subunit AdeB from the Acinetobacter baumannii AdeABC efflux pump solved by single-particle cryo-electron microscopy. The AdeB trimer adopts mainly a resting state with all protomers in a conformation devoid of transport channels or antibiotic binding sites. However, 10% of the protomers adopt a state where three transport channels lead to the closed substrate (deep) binding pocket. A comparison between drug binding of AdeB and Escherichia coli AcrB is made via activity analysis of 20 AdeB variants, selected on basis of side chain interactions with antibiotics observed in the AcrB periplasmic domain X-ray co-structures with fusidic acid (2.3 Å), doxycycline (2.1 Å) and levofloxacin (2.7 Å). AdeABC, compared to AcrAB-TolC, confers higher resistance to E. coli towards polyaromatic compounds and lower resistance towards antibiotic compounds.


2021 ◽  
Vol 12 ◽  
Author(s):  
Tao Gao ◽  
Yao Zhang ◽  
Jianrong Shi ◽  
Sherif Ramzy Mohamed ◽  
Jianhong Xu ◽  
...  

The main component of creosote obtained from dry wood distillation—guaiacol—is a natural antioxidant that has been widely used in pharmaceutical and food preservation applications. However, the antifungal mechanism of guaiacol against phytopathogens remains unclear. In this study, we found that guaiacol exerts inhibitory effects against mycelial growth, conidial formation and germination, and deoxynivalenol (DON) biosynthesis in Fusarium graminearum in a dose-dependent manner. The median effective concentration (EC50) value of guaiacol for the standard F. graminearum strain PH-1 was 1.838 mM. Guaiacol strongly inhibited conidial production and germination. The antifungal effects of guaiacol may be attributed to its capability to cause damage to the cell membrane by disrupting Ca2+ transport channels. In addition, the decreased malondialdehyde (MDA) levels and catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) activity by guaiacol treatment indicate that guaiacol displays activity against DON production by modulating the oxidative response in F. graminearum. Taken together, this study revealed the potentials of antioxidant in inhibiting mycotoxins in F. graminearum.


Author(s):  
Qing Wang ◽  
Yirong Li ◽  
Haoran Gao ◽  
Jianfeng Dai ◽  
Weixue Li

MnCo2O4/g-C3N4 composite material was synthesized by the hydrothermal method, compared with MnCo2O4 without g-C3N4, it has excellent electrochemical performance. The composite material can reach a specific capacitance of 350 Fg[Formula: see text] at 1 Ag[Formula: see text]. The capacity retention rate is 96% after 1000 cycles at the rate of 2 Ag[Formula: see text]. Experiments show that g-C3N4 can effectively disperse and improve the conductivity of urchin-like MnCo2O4, and the composite of sufficient g-C3N4 can give full play to the performance of urchin-like MnCo2O4, provide faster electronic transport channels, effectively improve the ion migration rate, and make urchin-like MnCo2O4 increase the rate performance under high charge and discharge rates.


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