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Although possessing well‐defined nanostructures and excellent multi‐electron redox properties, polyoxometalate clusters have poor intrinsic electrical conductivity and are prone to aggregation due to large surface energy, which makes them difficult to be fully utilized when applying as electrode materials for lithium‐ion batteries. In this paper, monodisperse K7MnV13O38 (MnV13) clusters are achieved by rationally utilizing nano‐sized high conductive carbon dots (CDs) as stabilizers. Benefiting from the fully exposed redox sites of MnV13 clusters (high utilization rate) and sufficient interfaces with carbon dots (extra interfacial energy storage), the optimized MnV13/10CDs anode delivers a high discharge capacity up to 1348 mAh g−1 at a current density of 0.1 A g−1 and exhibits superb rate/cycling capabilities. Density functional theory (DFT) calculations verify that ionic archway channels are formed between MnV13 and CDs, eliminating the bandgap and greatly improving the electron/ion conductivity of MnV13 and CDs. This paper paves a brand‐new way for synthesis of monodisperse clusters and maximization of extra interfacial energy storage. [ABSTRACT FROM AUTHOR]

Heterotrimeric G proteins play key roles in cellular processes. Although phenotypic analyses of Arabidopsis Gβ (AGB1) mutants have implicated G proteins in abscisic acid (ABA) signaling, the AGB1-mediated modules involved in ABA responses remain unclear. We found that a partial AGB1 protein was localized to the nucleus where it interacted with ABA-activated VirE2-interacting protein 1 (VIP1) and mitogen-activated protein kinase 3 (MPK3). AGB1 acts as an upstream negative regulator of VIP1 activity by initiating responses to ABA and drought stress, and VIP1 regulates the ABA signaling pathway in an MPK3-dependent manner in Arabidopsis. AGB1 outcompeted VIP1 for interaction with the C-terminus of MPK3, and prevented phosphorylation of VIP1 by MPK3. Importantly, ABA treatment reduced AGB1 expression in the wild type, but increased in vip1 and mpk3 mutants. VIP1 associates with ABA response elements present in the AGB1 promoter, forming a negative feedback regulatory loop. Thus, our study defines a new mechanism for fine-tuning ABA signaling through the interplay between AGB1 and MPK3–VIP1. Furthermore, it suggests a common G protein mechanism to receive and transduce signals from the external environment. [ABSTRACT FROM AUTHOR]

Pre‐intercalating ions between VO layers is considered to be an effective strategy to modulate the interlayer spacing of 2D vanadium oxides. However, the rigid pre‐intercalated ions hardly keep stable during repeated charging/discharging process and their sizes limit the extent of interlayer spacing expansion, which inevitably lead to poor rate capability and cycle stability. In this work, aliphatic diamines are adopted as pre‐intercalated guests to elastically modulate the interlayer spacing of VO layers by tuning the chain length of the organic diamine molecules. Benefiting from the strong interaction between the terminal doubly protonated amine and the polar negative oxygen bridge of the VO layers, the aliphatic diamine molecules can act as a structural stabilizer between the layers and boost fast Na ion diffusion (10−8 to 10−10 cm2 s−1). The sodium ion battery based on the first synthesized 1,6‐hexanediamine pre‐intercalated vanadium oxide supported on nickel foam hybrid cathode achieves a large specific capacity of 597 mAh g−1 at 0.09 A g−1, as well as superior rate performance and cycling stability. This work provides a strategy to elastically modulate 2D layered materials with tunable interlayer spacing for batteries based on large‐size‐ions. [ABSTRACT FROM AUTHOR]

Exploring an efficient non-enzymetic electrochemical sensor towards the detection of H2O2 is of great significance for the practical health monitoring and environmental analysis. In this study, four Preyssler-type polyoxometalate-based organic–inorganic hybrid materials were synthesized as non-enzymatic H2O2 electrochemical sensors having the formulae (H2bimb)6H4[(Mn(H2O)3)2(μ-bimb)(Mn(H2O)4(Mn(H2O)5)0.75(Mn(H2O)4)0.25(Na(H2O)P5W30O110))2]·30.5H2O (1), (H2bimb)3H4[(Co(H2O)4)2(μ-bimb)(Na(H2O)P5W30O110)]·10H2O (2), {[(Cu(Hbimb)(H2O)(μ-bimb)Cu(Hbimb)(H2O))(Cu(H2O)2(μ-bimb)Cu(H2O)2)((Cu(H2O)2)0.5(μ-bimb)(Cu(H2O)3)0.5)H2(Na(H2O)P5W30O110)]·12H2O}n (3) and (H2bimb)2H[((Zn(Hbimb)(H2O)2)0.5)2(Zn(Hbimb)(H2O)4)2(Na(H2O)P5W30O110)]·8H2O (4) (bimb = 1,4-bis(1H-imidazol-1-yl)benzene). In the compounds 1–4, Preyssler {P5W30} clusters show abundant coordination modes, and support the transition metal–organic fragments to give fascinating diverse networks. When used as electrochemical sensors for H2O2 detection, compounds 1–4 exhibited good electrocatalytic activities with high sensitivity and low detection limit. Among them, compound 2 showed the lowest limit of detection of 0.13 mM with a high sensitivity of 4.35 μA mM−1 and fast response time of 1 s. Moreover, compound 2 displayed excellent electrochemical operational stability and anti-interference capacity. This study provides a good choice for the development of promising electrochemical non-enzymatic H2O2 sensors by employing Preyssler {P5W30}-based materials. [ABSTRACT FROM AUTHOR]

Exploring an efficient non-enzymetic electrochemical sensor towards the detection of H2O2 is of great significance for the practical health monitoring and environmental analysis. In this study, four Preyssler-type polyoxometalate-based organic–inorganic hybrid materials were synthesized as non-enzymatic H2O2 electrochemical sensors having the formulae (H2bimb)6H4[(Mn(H2O)3)2(μ-bimb)(Mn(H2O)4(Mn(H2O)5)0.75(Mn(H2O)4)0.25(Na(H2O)P5W30O110))2]·30.5H2O (1), (H2bimb)3H4[(Co(H2O)4)2(μ-bimb)(Na(H2O)P5W30O110)]·10H2O (2), {[(Cu(Hbimb)(H2O)(μ-bimb)Cu(Hbimb)(H2O))(Cu(H2O)2(μ-bimb)Cu(H2O)2)((Cu(H2O)2)0.5(μ-bimb)(Cu(H2O)3)0.5)H2(Na(H2O)P5W30O110)]·12H2O}n (3) and (H2bimb)2H[((Zn(Hbimb)(H2O)2)0.5)2(Zn(Hbimb)(H2O)4)2(Na(H2O)P5W30O110)]·8H2O (4) (bimb = 1,4-bis(1H-imidazol-1-yl)benzene). In the compounds 1–4, Preyssler {P5W30} clusters show abundant coordination modes, and support the transition metal–organic fragments to give fascinating diverse networks. When used as electrochemical sensors for H2O2 detection, compounds 1–4 exhibited good electrocatalytic activities with high sensitivity and low detection limit. Among them, compound 2 showed the lowest limit of detection of 0.13 mM with a high sensitivity of 4.35 μA mM−1 and fast response time of 1 s. Moreover, compound 2 displayed excellent electrochemical operational stability and anti-interference capacity. This study provides a good choice for the development of promising electrochemical non-enzymatic H2O2 sensors by employing Preyssler {P5W30}-based materials. [ABSTRACT FROM AUTHOR]

Introduction: Nitrogen is a major abiotic stress that affects plant productivity. Previous studies have shown that plant H+-pyrophosphatases (H+-PPases) enhance plant resistance to low nitrogen stress. However, the molecular mechanism underlying H+-PPase-mediated regulation of plant responses to low nitrogen stress is still unknown. In this study, we aimed to investigate the regulatory mechanism of AtAVP1 in response to low nitrogen stress., Methods and Results: AtAVP1 in Arabidopsis thaliana and EdVP1 in Elymus dahuricus belong to the H+-PPase gene family. In this study, we found that AtAVP1 overexpression was more tolerant to low nitrogen stress than was wild type (WT), whereas the avp1-1 mutant was less tolerant to low nitrogen stress than WT. Plant height, root length, aboveground fresh and dry weights, and underground fresh and dry weights of EdVP1 overexpression wheat were considerably higher than those of SHI366 under low nitrogen treatment during the seedling stage. Two consecutive years of low nitrogen tolerance experiments in the field showed that grain yield and number of grains per spike of EdVP1 overexpression wheat were increased compared to those in SHI366, which indicated that EdVP1 conferred low nitrogen stress tolerance in the field. Furthermore, we screened interaction proteins in Arabidopsis; subcellular localization analysis demonstrated that AtAVP1 and Arabidopsis thaliana receptor-like protein kinase (AtRLK) were located on the plasma membrane. Yeast two-hybrid and luciferase complementary imaging assays showed that the AtRLK interacted with AtAVP1. Under low nitrogen stress, the Arabidopsis mutants rlk and avp1-1 had the same phenotypes., Discussion: These results indicate that AtAVP1 regulates low nitrogen stress responses by interacting with AtRLK, which provides a novel insight into the regulatory pathway related to H+-pyrophosphatase function in plants., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Zhang, Chen, Xu, Liu, Tang, Chen, Zhou, Xu, Chen, Ma, Chen, Sun and Fan.)