Nucleophilic addition of carbon-centered nucleophiles to nanographene ketones represents a valuable late-stage method for the functionalization zigzag nanographenes, but its use is rare in chemical literature. Using two model systems, non-Kekulé triangulene-4,8-dione and Kekulé anthanthrone, we identify unexpected regioselectivities uncover rules that govern these reactions. Considering large n...

The importance of caterpillar trees in the topological theory of benzenoid systems lies in the following. Let B be a non-branched cata-condensed benzenoid hydrocarbon (that is a hydrocarbon containing linearly and angularly condensed rings). If we associate a symbol L to each linearly condensed ring (and also to the two terminal ones) and a symbol A to each angularly condensed ring, then the so...

Joan Veny i Clar is Professor Emeritus of Catalan Philology at the Universitat de Barcelona. He is one of the most important dialectologists of Catalan, with prominent works such as the 1978 monograph Els parlars catalans (“The Catalan dialects”), although he has also done extensive work in the diachronic linguistics and etymology of this language. He is a member of the Institut d’Estudis Catal...

The axenization of an Entamoeba histolytica isolate with a nonpathogenic isoenzyme electrophoretic pattern (zymodeme) was recently achieved for the first time (15). Forty days after the cells were transferred to the medium used for axenic cultivation, the amebae developed virulence properties, and the zymodeme converted to a pathogenic pattern. To exclude the possibility that the original isola...

În condițiile unei pandemii, prioritățile pentru orice comandant trebuie să fie axate pe protecția personalului propriu, menținerea capacității de luptă și îndeplinirea misiunilor. Aplicarea măsurilor protecție a se realizează într-o concepție unitară gradual, în funcție evoluția pandemică din zona responsabilitate. Apariția unor virusuri ce mai contagioase favorizarea răspândirii rapide acesto...

A new technique for integrating experimental manipulations into text-based, synchronous dialogue is introduced. This method supports fine-grained, systematic transformation of conversational turns and the introduction of ‘artificial’ probe turns and turn sequences. It can be used to introduce manipulations that are sensitive to aspects of the local linguistic and conversational context for any ...