Au-modified PtCu nanodendrites as a highly stable and active electrocatalyst.

Direct galvanic replacement of surface Cu with Au in PtCu nanodendrites is applied to synthesize an Au-modified PtCu nanodendrite catalyst (PtCu-Au), which shows both superior stability and excellent activity for the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). The PtCu-Au catalyst only lost 7% of its MOR activity and its ORR half-wave potential decreased 8 mV after 10 000 potential cycles.

Development and Validation of a Personalized Prognostic Prediction Model for Patients With Spinal Cord Astrocytoma.

Background: The study aimed to investigate the prognostic factors of spinal cord astrocytoma (SCA) and establish a nomogram prognostic model for the management of patients with SCA.

Methods: Patients diagnosed with SCA between 1975 and 2016 were extracted from the Surveillance, Epidemiology, and End Results (SEER) database and randomly divided into training and testing datasets (7:3). The primary outcomes of this study were overall survival (OS) and cancer-specific survival (CSS).

Gilgamesh is required for the maintenance of germline stem cells in Drosophila testis.

Emerging evidence supports that stem cells are regulated by both intrinsic and extrinsic mechanisms. However, factors that determine the fate of stem cells remain incompletely understood. The Drosophila testis provides an exclusive powerful model in searching for potential important regulatory factors and their underlying mechanisms for controlling the fate of germline stem cells (GSCs).