Shandong Normal University

About: Shandong Normal University is a education organization based out in Jinan, Shandong, China. It is known for research contribution in the topics: Laser & Catalysis. The organization has 12378 authors who have published 12576 publications receiving 174572 citations.

Hierarchical Particle-In-Quasicavity Architecture for Ultratrace In Situ Raman Sensing and Its Application in Real-Time Monitoring of Toxic Pollutants

Abstract: Unstable detection environment is one of the biggest interferences for in situ surface-enhanced Raman spectroscopy (SERS) using in real-time monitoring of toxic pollutants, leading to unreliable results. To address this problem, we have designed and prepared a cavity-based particle-in-quasicavity (PIQC) architecture composed of hierarchical ZnO/Ag nanosheets and nanoprotrusions for improving the in situ SERS performance under a liquid environment. Benefitting from the special cascaded optical field mode, the PIQC ZnO/Ag exhibits excellent in situ SERS detectability, with 10-18 M of limit of detection for rhodamine 6G and 12.8% of signal relative standard deviation value. Furthermore, by means of a microfluidic chip, this PIQC structure is proved to have the quantitative analysis feasibility and realizes real-time monitoring of the 3,3',4,4'-tetrachlorobiphenyl, a representative global environmental hazard, under the flowing environment. The strategy in this paper provides a brand new idea to promote the application of in situ SERS in contaminant monitoring and is also instructive for light control in other optical fields.

Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries

Abstract: Dual-functional NiCo2S4 polyhedral architectures with outstanding electrochemical performance for supercapacitors and lithium-ion batteries (LIBs) have been rationally designed and successfully synthesized by a hydrothermal method. The as-synthesized NiCo2S4 electrode for supercapacitor exhibits an outstanding specific capacitance of 1298 F g−1 at 1 A g−1 and an excellent rate capability of ~80.4% at 20 A g−1. Besides, capacitance retention of 90.44% is realized after 8000 cycles. In addition, the NiCo2S4 as anode in LIBs delivers high initial charge/discharge capacities of 807.6 and 972.8 mAh g−1 at 0.5 C as well as good rate capability. In view of these points, this work provides a feasible pathway for assembling electrodes and devices with excellent electrochemical properties in the next generation energy storage applications.

Exponential Stability of Nonlinear Systems With Delayed Impulses and Applications

Abstract: We consider a class of nonlinear impulsive systems with delayed impulses, where the time delays in impulses exist between two consecutive impulse instants. Based on the impulsive control theory and the ideas of average dwell time (ADT), a set of Lyapunov-based sufficient conditions for globally exponential stability are obtained. It is shown that the time delay in impulses exhibits double effects (i.e., negative or positive effects) on system dynamics, namely, it may destroy the stability and lead to undesired performance, and conversely, it may stabilize an unstable system and achieve better performance. Then, we apply the theoretical results to synchronization control of chaotic systems and design some impulsive controllers that are formalized in terms of linear matrix inequality and ADT-like conditions. Two numerical examples including chaotic cellular neural network and Chua's oscillator are given to illustrate the applicability of the presented impulsive control schemes. Our examples show that, under some conditions, the impulsive synchronization of chaotic systems can be achieved via the input delays in impulses.

Cutting Edge: TRAF6 Mediates TLR/IL-1R Signaling-Induced Nontranscriptional Priming of the NLRP3 Inflammasome.

Abstract: NLRP3 inflammasome activiation requires two sequential signals. The priming signal 1 from TLRs or cytokine receptors induces the transcription of NLRP3 and IL-1β, and concomitantly promotes transcription-independent activation of caspase-1. The activating signal 2 can be provided by microbial products or danger signals. In this study we found that TRAF6 is necessary for the nontranscriptional priming of NLRP3 inflammasome by TLR/IL-1R derived signals. Deficiency of TRAF6 specifically inhibited TLR/IL-1R priming-initiated caspase-1 cleavage, pyroptosis, and secretion of presynthesized IL-18. Mechanistically, TRAF6 promoted NLRP3 oligomerization as well as the interaction between NLRP3 and apoptosis-associated speck-like protein containing a CARD. Of note, the nontranscriptional priming via TRAF6 did not involve mitochondrial reactive oxygen species or the phosphorylation of Jnk, Erk, and Syk, whereas the ubiquitin E3 ligase activity of TRAF6 was required. Our findings thus extended cognition on the mechanism of NLRP3 inflammasome activation, and provided a novel target for controlling NLRP3-related diseases.

Mitochondria-Targeted Reaction-Based Two-Photon Fluorescent Probe for Imaging of Superoxide Anion in Live Cells and in Vivo

Abstract: A newly synthesized reaction-based two-photon (TP) fluorescence imaging probe, 9-butyltriphenylphosphoniumacylamino-2,7-dibenzothiazolineflurene (MF-DBZH), composed of a superoxide anion (O2(•-)) responsive group and a mitochondria-targeted site, has been shown to have high selectivity toward mitochondrial O2(•-) fluxes. The fluorescence intensity of MF-DBZH responds proportionally to changes in O2(•-) concentrations. Moreover, MF-DBZH was proved to be insensitive toward pH changes and has high photostability. Favorable features of this probe also include convenient cell loading, easy staining of both cells and small animals, and excellent biocompibility. Most importantly, MF-DBZH gives reliable TP fluorescent signal to changes of O2(•-) levels in vivo.