The last decade witnessed the discovery of diverse hollow graphitic structures [1]. Several spherical [2] and cylindrical [3] structures have been observed. A natural question is whether structures with other topologies, such as tori, also occur. It is reasonable to expect that molecules that are multiply connected and have negative curvature (i.e. have regions that approximate a saddle) would ...

‎we consider nonconvex vector optimization problems with variable ordering structures in banach spaces‎. ‎under certain boundedness and continuity properties we present necessary conditions for approximate solutions of these problems‎. ‎using a generic approach to subdifferentials we derive necessary conditions for approximate minimizers and approximately minimal solutions of vector optimizatio...

The stable configurations, electronic structure and magnetic properties of B16N16, B8C24, Al and P inserted (BC3)8 was studied by performing density functional theory (DFT) calculations of the NMR parameters. The results indicate that B8C24 has semiconductivity property and be effectively modified by inserti...

In 1903, Arthur Cushny, Professor of Materia Medica and Therapeutics at the University of Michigan, published an article in the Journal of the American Medical Association entitled “The Pharmacologic Action of Drugs: Is It Determined by Chemical Structure or by Physical Characters(1)?” To a chemist today, this question might seem odd. The physical properties of a drug and its chemical structure...

The fine structure of desmosomes is well established (1-3), and some information about their chemical composition is available (4-6) . Recently techniques were developed for performing enzymatic digestions on osmium tetroxide-fixed, alcoholor acetone-dehydrated and epoxyembedded tissues (7-10) . These methods can determine with considerable specificity the organic components of many cell struct...