Human AR peptide

MXene, as an emerging class of conductive two-dimensional materials, have extraordinary applications in the field of electrochemical energy storage. However, the intrisic capacity of MXene still need to be improved due to the large gap to their theoretical capacity. Here, we provide a facile and new strategy to enhance their electrochemical performance-postetch low-temperature annealing (below 400 degrees C) under Ar atmosphere. Due to the formation of more C-Ti-O active sites and larger interlayer voids, the Ti3C2Tx freestanding film annealed under 200 degrees C exhibits a high capacitance of 429 F/g and energy density of 29.2 Wh/Kg in 1 M H2SO4 electrolyte, it could withstand 5000 cycles with 89% of the capacitance retention. By comparison, the Ti3C2Tx annealed at higher temperature (400 degrees C), presented a high resistance and poor electrochemical property because of partial oxidation and breaking of Ti-C bond on the surface of MXene nanosheets, despite the larger interlayer voids and low -F contents, . This work is not only probing the importance to maintain the original structure of MXene but also proposing a new strategy to realizing a high capacitance of pure MXene electrode. (C) 2020 Elsevier Ltd. All rights reserved.

The potato leafroll virus (PLRV) P0 protein (P0(PL)) is a suppressor of RNA silencing. In this study, we showed that P0 protein from an Argentinian isolate of PLRV (P0(PL-Ar)) has an additional activity not described for other PLRV or P0 proteins from poleroviruses. Besides reporting that P0(PL-Ar) displays both local and systemic silencing suppressor activity, we demonstrated, for the first time, that P0(PL-Ar) impedes accumulation of dsRNA-derived siRNAs. We also showed that P0(PL-Ar) interacts with Solanum tuberosum SKP1 orthologue (StSKP1) and triggers destabilization of ARGONAUTE 1 (AGO1) and that these actions are mediated by the F-box-like domain. A mutant in the GW/WG motif within the P0(PL-Ar) F-box-like motif lost the suppression activity, the interaction with StSKP1 and abolished AGO1 decay. Interestingly, a mutant in the L76/P77 residues within the P0(PL-Ar) F-box-like motif, which lost the suppression activity and the interaction with StSKP1, retained the capacity to enable AGO1 decay. Thus, unlike other P0 proteins of previously characterized poleroviruses, P0(PL-Ar) seems to have a dual activity, according to the findings of this study. This protein would act at both an upstream and a downstream step of the RNA silencing pathway: upstream of Dicer-like enzyme (DCL)-mediated primary siRNA production and downstream at the RNA-induced silencing complex (RISC) complex level. Our results contribute to the understanding of the different ways PLRV P0 proteins function as silencing suppressors.