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...

We compare strawman designs for two Square Kilometre Array demonstrators, the Extended New Technology Demonstrator (xNTD) and the Canadian Large Adaptive Reflector (CLAR), in the context of survey capability and suitability for addressing key survey science programmes. We first show that, all else being equal, the survey speed for detecting point sources is proportional to the product of field-...

The Canadian Large Adaptive Reflector (CLAR) is a proposed prototype of a new concept for large, filled-aperture radio telescopes. The prototype would have a 300-metre aperture, working up to frequencies of at least 1.4 GHz, and would be equipped with a multi-beam phased array providing a field-of-view of 0.8 • at that frequency. The largest fully-steerable radio telescope in the world, and end...

The gene encoding BLIP, a beta-lactamase-inhibitory protein, was disrupted in wild-type Streptomyces clavuligerus and in a clavulanic acid non-producing mutant. The resulting BLIP mutant and BLIP/clavulanic acid double mutant showed no residual proteinaceous beta-lactamase-inhibitory activity, indicating that only a single beta-lactamase-inhibitory protein exists in S. clavuligerus. The lack of...

We define the anti-forcing number of a perfect matching M of a graph G as the minimal number of edges of Gwhose deletion results in a subgraph with a unique perfect matching M , denoted by af (G,M). The anti-forcing number of a graph proposed by Vukičević and Trinajstić in Kekulé structures of molecular graphs is in fact the minimum anti-forcing number of perfect matchings. For plane bipartite ...

Objectives: To compare the obtained values for maximal respiratory pressures of a sample of Brazilian adolescents with the values predicted by Wilson et al. and Domènech-Clar et al. Methods: 156 adolescents (84 boys) aged between 12 and 17 years were assessed. Maximal respiratory pressures were assessed by a digital manometer with the adolescents in the seated position and wearing a nose clip. ...