Altan derivatives of polycyclic conjugated hydrocarbons were recently introduced and studied in theoretical organic chemistry. We now provide a generalization of the altan concept, applicable to any graph. Several earlier noticed topological properties of altan derivatives of polycyclic conjugated hydrocarbons are shown to be the properties of all altan derivatives of all graphs. Among these ar...

altan derivatives of polycyclic conjugated hydrocarbons were recently introduced and studied in theoretical organic chemistry. we now provide a generalization of the altan concept, applicable to any graph. several earlier noticed topological properties of altan derivatives of polycyclic conjugated hydrocarbons are shown to be the properties of all altan derivatives of all graphs. among these ar...

Ab initio calculations of the current density induced by an external magnetic field in altan-[10,5]coronene 3 (or altan(2)-[10]annulene) indicate the onset of a diatropic current on the outer loop (the "perimeter"), thus in contrast to the intentional design of altan-molecules. Spectral decomposition of the current shows that the failure of the altanisation design can be expected whenever the p...

The main topological characteristics of altan-benzenoids were established. In particular, it was shown that the perimeter of Kekuléan altan-benzenoids is of size 4k , having a destablizing (anti-aromatic) energy effect, similar to (4k)-annulenes.

π-Electron ring-currents for the altans of the four regular [r,s]-coronenes are calculated by the topological HLPM approach. The bond-current pattern of the parent structure is generally preserved in the core of the corresponding altan. Altan-[10,5]-coronene appears to support an anomalous diamagnetic current in its [4n]-periphery. This invites further investigation.

JCB • VOLUME 210 • NUMBER 7 • 2015 1038 In some ways, Nihal Altan-Bonnet’s career shares similarities with a national security agent, pursuing invaders. As a graduate student in Sandy Simon’s laboratory at The Rockefeller University, she showed that drug-resistant tumor cells were sequestering chemotherapy drugs away in acidified membrane compartments for deportation from the cell (1). That beg...

This study investigates the writing style change of two Turkish authors, Çetin Altan and Yaşar Kemal, in their old and new works using respectively their newspaper columns and novels. The style markers are the frequencies of word lengths in both text and vocabulary, and the rate of usage of most frequent words. For both authors, t-tests and logistic regressions show that the length of the words...