Ceria nanotubes with extended cavities can be obtained by a facile oxidation−coordination-assisted dissolution process of the partially oxidized one-dimensional Ce(OH)3. Moreover, the ceria nanotubes with large cavities and thin walls exhibit excellent reducibility and high oxygen storage capacity, indicating they are potential novel catalytic materials.
An inside job: Porous hollow carbonaceous microspheres can be easily fabricated by hydrothermal treatment of Saccharomyces cerevisiae cells. An amphiphilic surface and porous shell structure endow these microspheres with phase‐transfer features and the ability to enrich proteins inside their hollow interiors. These characteristics will enable their application in drug delivery, active ingredients encapsulation, adsorption, and separation techniques.
We present the first results from the ongoing, intensive, multiwavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this active galactic nucleus was, in part, selected for its historically unobscured nature, we discovered that the X-ray spectrum is highly absorbed, and there are new blueshifted, broad, and narrow UV absorption lines, which suggest that a dust-free, ionized obscurer located at the inner broad-line region partially covers the central source. Despite the obscuration, we measure UV and optical continuum reverberation lags consistent with a centrally illuminated Shakura–Sunyaev thin accretion disk, and measure reverberation lags associated with the optical broad-line region, as expected. However, in the first 55 days of the campaign, when the obscuration was becoming most extreme, we observe a de-coupling of the UV continuum and the UV broad emission-line variability. The correlation recovered in the next 42 days of the campaign, as Mrk 817 entered a less obscured state. The short C iv and Lyα lags suggest that the accretion disk extends beyond the UV broad-line region.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.