Deoxyribozymes (DNA catalysts) have been reported for cleavage of RNA phosphodiester linkages, but cleaving peptide or DNA phosphodiester linkages is much more challenging. Using in vitro selection, here we identified deoxyribozymes that sequence-specifically hydrolyze DNA with multiple turnover and with a rate enhancement of 108 (possibly as high as 1014). The new DNA catalysts require both Mn...

Mirmohades, M. 2016. Insight into Catalytic Intermediates Relevant for Water Splitting. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1359. 81 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9526-8. Catalysis is an important part of chemistry. This is also reflected in the chemical industry where 85-90 % of all products are made...

Heterogeneous Fe-Mn/sepiolite catalysts were prepared by the coprecipitation method, followed by heat treatment. The catalysts were characterized by several techniques; analysis by X-ray fluorescence (XRF) and scanning electron microscopy (SEM) confirmed the existence of fine Fe and Mn particles in the catalysts. Compared to natural sepiolite, the specific surface area of the Fe-Mn/sepiolite ca...

in this research different types of al2o3 were used as supports to prepare catalysts for dehydrogenation of isobutane to isobutene. these supports were al2o3 from merck, axen and gamma al2o3 synthesized from al(oh)3. sn/pt/al2o3 catalysts were prepared by sequential impregnation, at first pt and then sn was deposited. characterization of catalysts was performed by x-ray powder diffraction (xrd)...

The energy deficiency and environmental problems have motivated researchers to develop conversion systems into a sustainable pathway, the development of catalysts holds center research endeavors. Natural such as metalloenzymes maintained cycles on Earth, thus proving themselves optimal catalysts. In previous results, structural functional analogs enzymes nano-sized electrocatalysts shown promis...

Enzymes catalyze organic transformations with exquisite levels of selectivity, including chemoselectivity, stereoselectivity, and substrate selectivity, but the types of reactions catalyzed by enzymes are more limited than those of chemical catalysts. Thus, the convergence of chemical catalysis and biocatalysis can enable enzymatic systems to catalyze abiological reactions with high selectivity...

are now essential in organic chemistry and have been widely applied to medicinal chemistry, process chemistry, etc. We developed a novel organometallic catalysis and their application to drug discovery and found two new catalysts, ruthenium hydride with a nitrogen-containing heterocyclic carbene (A) and an organopalladium catalyst supported on a sulfur-terminated semi-conductor, gallium arsenid...

Cell membranes are dynamic structures found in all living organisms. There have been numerous constructs that model phospholipid membranes. However, unlike natural membranes, these biomimetic systems cannot sustain growth owing to an inability to replenish phospholipid-synthesizing catalysts. Here we report on the design and synthesis of artificial membranes embedded with synthetic, self-reprod...