Once upon a time

Once and only once upon a time: specifying and regulating origins of DNA replication in eukaryotic cells.

A Never-Ending Story

Take a strip of paper with ‘once upon a time there’ written on one side and ‘was a story that began’ on the other. Twisting the paper and joining the ends produces John Barth’s story Frame-Tale, which prefixes ‘once upon a time there was a story that began’ to itself. In this paper, I argue that the possibility of understanding Frame-Tale cannot be explained by tacit knowledge of a recursive th...

Once upon a Time, There Was Papyrus

A brief review on the influences of nanotubes' entanglement and waviness on the mechanical behaviors of CNTR polymer nanocomposites

Invention of carbon nanotube (CNT) in the 1990s introduced a new class of materials whose extraordinary mechanical, thermal, and electrical properties seemed appealing enough to the research community to devote their time and effort for the purpose of analyzing composite materials reinforced by CNTs. Particularly, the marvelous stiffness of CNTs has made it possible to reach a high-modulus comp...

From once upon a time to happily ever after: Tracking emotions in mail and books

Available online 23 May 2012

Characterization of Copper-Manganese Oxide Catalysts and Their Precursors: Effect of Precipitate Aging upon the Structure and Morphology of Precursors and Catalysts

Copper-manganese oxide catalysts are prepared with an atomic ratio of Cu/Mn=2/1 using a coprecipitation procedure under air atmosphere. The time of aging, i.e., the time that precipitate remains in contact with the precipitating medium, has been varied from 0 (for unaged precursor) to 300 minutes and the effect of precipitate aging time in each atmosphere upon the structure and morphology of di...