Ozone Decomposition Mechanism at Different Structural Oxygen Vacancies on Manganese Dioxide

MnO2 is a promising catalyst for ozone decomposition, and oxygen vacancy has been regarded as the determinant factor for decomposition effectiveness. MnO2 with two different oxygen vacancies, that is, [Mn3+]-V0-[Mn3+] and [Mn3+]-V0, was synthesized and characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The catalytic decomposition rate of [Mn3+]-V0-[Mn3+] was significantly greater than that of [Mn3+]-V0. MnO2 with [Mn3+]-V0-[Mn3+] showed the lowest average oxidation state of Mn and the fastest electron transfer capacity. A new pathway for ozone decomposition at [Mn3+]-V0-[Mn3+] was proposed accordingly. The reaction sequence involved (i) dissociative adsorption of ozone to form an oxygen molecule and an atomic O– at [Mn3+], (ii) reaction of O– further with another O3 molecule to form [Mn4+]-O-O-[Mn4+], and (iii) [Mn4+]-O-O-[Mn4+] decomposition to form a gas-phase oxygen molecule and [Mn3+]-V0-[Mn3+] for further ozone adsorption. This work revealed a new avenue for designing efficient catalysts for ozone elimination

Hierarchical Nitrogen-Doped Graphitic Carbon Spheres Anchored with Amorphous Cobalt Nanoparticles as High-Performance and Ultrastable Anode for Potassium-Ion Batteries

As one of the most promising electrochemical energy-storage devices after lithium-ion batteries, potassium-ion batteries (KIBs) have been restricted by the limited capacity of carbon-based anodes. Herein, we design and prepare three-dimensional nitrogen-doped graphitic carbon spheres anchored with cobalt nanoparticles (CoNC) via self-sacrifice template method. The CoNC spheres exhibit a uniform spherical morphology with an inner hierarchical structure. The final calcination temperature is changed to obtain CoNC-700, CoNC-800, and CoNC-900, in which CoNC-700 is verified to combine amorphous cobalt nanoparticles with graphitic carbon spheres successfully and presents excellent rate capability and good potassium-storage performance. Nitrogen-doping and amorphous cobalt nanoparticle-loading can effectively introduce rich defects to the CoNC electrode, enhance electrical conductivity, and accelerate potassium-storage kinetics, which leadto a reversible specific capacity of 382 mA h g–1 at a current density of 0.5 A g–1 and 330 mA h g–1 at a current density of 1 A g–1 after 1000 cycles, suggesting the potential of the high-capacity, ultrastable anode for potassium-ion batteries

Enhanced production of total flavones from <i>Inonotus baumii</i> by multiple strategies

<p>As one kind of important secondary metabolites produced by <i>Inonotus baumii,</i> flavones can be applied in food, medicine, and other industries due to their biological activities such as antioxidant, anticancer, and antibacterial activity. To enhance total flavone production in submerged fermentation of <i>I. baumii,</i> three different strategies, optimization of fermentation parameters by statistical designs including Plackett–Burman design and response surface methodology, addition of precursors and elicitors, and two-phase culture, were used. The production of total flavones (PTF) reached 1532.83 mg/L when the optimized medium was used. All precursors and elicitors can increase the PTF. The maximum PTF (2184.06 mg/L, up to 1.57-fold) was obtained with the addition of both AgNO₃ and glutathione in fermentation media. Interestingly, when 0.5% (w/v) DM130 macroporous resin as adsorbent was added to fermentation broth on day 4 of culture, the highest production reached 2407.79 mg/L with this two-phase culture strategy. These methods can be further applied to large-scale industrial production and broaden the application of flavones.</p

Additional file 1 of Induction of therapeutic immunity and cancer eradication through biofunctionalized liposome-like nanovesicles derived from irradiated-cancer cells

Supplementary Material

Additional file 1 of Stabilization of KPNB1 by deubiquitinase USP7 promotes glioblastoma progression through the YBX1-NLGN3 axis

Additional file 1: Supplementary Fig. S1. KPNB1 regulated GBM progression in vitro. A-E. U87MG and U251MG cells were infected with lentivirus vectors expressing shKPNB1#1 and shKPNB1#2. Cells were collected for Western blot analysis (A), RT-qPCR (B), CCK8 assay (C), colony formation assay (D), and Transwell invasion assay (E). Data presented as the mean ± SD of three independent experiments, ***P < 0.001, one-way ANOVA. F-J. U87MG and U251MG cells were infected with lentivirus vectors expressing KPNB1 plasmids. Cells were collected for Western blot analysis (F), RT-qPCR (G), CCK8 assay (H), colony formation assay (I), and Transwell invasion assay (J). K and L. U87MG and U251MG cells were infected with lentivirus vectors expressing shKPNB1. The control and knockdown KPNB1 groups were treated with TMZ(10 μM), respectively. CCK8 was used to detect cell proliferation (K), and flow cytometry was used to detect cell apoptosis (L). Data presented as the mean ± SD of three independent experiments; ***P < 0.001, one-way ANOVA