https://www.selleckchem.com/products/Fulvestrant.html We envision that this strategy would lead to insights into SO2 concentration-dependent biological effects and cell signals.In this work, polyoxometalate-modified magnetic nanocomposite Fe3O4@PDA@POM was prepared by coating [Cu(HL)4]2[P2Mo5O23]2·8H2O (POM, L = 2-aminopyridine) on the surface of a preassembled polydopamine (PDA)-capped carboxyl-functionalized Fe3O4 magnetic microspheres. Our studies on Gram negative bacterium Escherichia coli (E. coli) indicated that owing to the collective effect between preassembled Fe3O4 and POM, the Fe3O4@PDA@POM nanocomposite loaded on nickel foam exhibited outstanding antibacterial activity and reusability, and even after 6 cycles it has a high antibacterial capability of ca. 90%. Further extension of this investigation towards Gram positive bacterium Staphylococcus albus (S. aureus) demonstrated a similar toxicity pattern, confirming the potential applications of this material for water treatment in biochemical processes. The antibacterial mechanism of the Fe3O4@PDA@POM nanocomposite was further investigated by taking E. coli as a model microorganism.Telomerase catalyzes the elongation of telomeres, which is closely associated with tumorigenesis. Therefore, development of reliable and convenient methods for telomerase activity analysis is critical for clinical diagnosis of cancers. However, most of the current probes for intracellular telomerase activity assay suffer from inevitable false-positive interferences. In this study, we have proposed a novel fluorescence resonance energy transfer (FRET)-based strategy for ultrasensitive monitoring intracellular telomerase activity with an amplification-free procedure. DNA nanoprobes constructed using a DNA tetrahedron and Flare DNA are designed to circumvent the problem of false-positive interference. Generally, telomerase catalyzes DNA extension and changes the configuration of the DNA nanoprobe, which finally leads to the increas