Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

In order to develop nanocatalysts with enhanced catalytic performance, it is important to be able to synthesize nanocrystals enclosed by high-index surface facets, due to their high density of low coordinated atoms at step, ledge and kink sites. Here, we report a facile seed-mediated route to the synthesis of highly branched Pd nanostructures with a combination of {113}, {115} and {220} high-index surface planes. The size of these nanostructures is readily controlled by a simple manipulation of the seed concentration. The selective use of oleylamine and oleic acid was also found to be critical to the synthesis of these structures, with Pd icosahedra enclosed by low-index {111} facets being produced when hexadecylamine was employed as capping ligand. The structure–property relationship of these nanostructures as catalysts in Suzuki-cross coupling reactions was then investigated and compared, with the high-index faceted branched Pd nanostructures found to be the most effective catalysts

Prospectus, February 11, 2004

https://spark.parkland.edu/prospectus_2004/1003/thumbnail.jp

Prospectus, December 10, 2003

https://spark.parkland.edu/prospectus_2003/1032/thumbnail.jp

Prospectus, May 7, 2003

https://spark.parkland.edu/prospectus_2003/1014/thumbnail.jp

Prospectus, April 20, 2003

https://spark.parkland.edu/prospectus_2003/1013/thumbnail.jp

Prospectus, September 24, 2003

https://spark.parkland.edu/prospectus_2003/1022/thumbnail.jp

Prospectus, March 5, 2003

https://spark.parkland.edu/prospectus_2003/1006/thumbnail.jp

Prospectus, February 12, 2003

https://spark.parkland.edu/prospectus_2003/1003/thumbnail.jp

Stress-dependent relocalization of translationally primed mRNPs to cytoplasmic granules that are kinetically and spatially distinct from P-bodies

Cytoplasmic RNA granules serve key functions in the control of messenger RNA (mRNA) fate in eukaryotic cells. For instance, in yeast, severe stress induces mRNA relocalization to sites of degradation or storage called processing bodies (P-bodies). In this study, we show that the translation repression associated with glucose starvation causes the key translational mediators of mRNA recognition, eIF4E, eIF4G, and Pab1p, to resediment away from ribosomal fractions. These mediators then accumulate in P-bodies and in previously unrecognized cytoplasmic bodies, which we define as EGP-bodies. Our kinetic studies highlight the fundamental difference between EGP- and P-bodies and reflect the complex dynamics surrounding reconfiguration of the mRNA pool under stress conditions. An absence of key mRNA decay factors from EGP-bodies points toward an mRNA storage function for these bodies. Overall, this study highlights new potential control points in both the regulation of mRNA fate and the global control of translation initiation

The Maine Obstetric Medical Simulation (MOMSim) Program Identifies and Categorizes Latent Safety Threats Across Rural Hospitals

Objective: Combine in-situ simulation with an HFMEA framework to identify and categorize common system wide LST and opportunities to improve patient safetyhttps://knowledgeconnection.mainehealth.org/lambrew-retreat-2023/1003/thumbnail.jp