Kekule is describing hon'' in 1890 he discovered the benzol rine. It was not the ter.t which made him see the light. On the contrary, the new insight was born from an associative, half conscious perception of visual dynamic images: the snakes dance, and one of them, and notice this mockinglv gets hold of its own taii. Was it mockingly because the scientific discovery was right there before his ...

One of the oldest and most useful concepts in chemistry is that of the chemical bond. While the current understanding of a chemical bond has become relatively sophisticated, the original representation of a single bond between two atoms by a line and a double bond by two lines, dates from Odling (1860) and Kekule (1861). Although the theory of the chemical bond has enjoyed considerable developm...

a Institute of Physical Chemistry, Attila Jözsef University, Szeged, Hungary; on leave from Faculty of Science, University of Kragujevac b Institute of Mathematics, Academia Sinica, Taipei, Taiwan, R.O.C. c Department of Chemistry, National Chung-Cheng University, Chia-Yi, Taiwan, R.O.C. d Department of Information Sciences, Ochanomizu University, Tokyo, Japan e Division of Physical Chemistry, ...

Introduction. Etoricoxib is a selective cyclooxygenase (COX-2) inhibitor used for the treatment of acute pain and has anti-inflammatory analgesic efficacy. causes fewer complications compared to other non-steroidal drugs (NSAIDs). FSI "SID GP" developed an ophthalmic liquid dosage form based on etoricoxib. This article proposes method determining content etoricoxib in by high performance chroma...

The analysis of physical properties connected to the electron spin in terms of spin densities requieres some caution : i) Spin densities cannot be always calculated or discussed in the frame of standard independentparticle model (as the restricted Hartree-Fock theory), neither in the frame of amended spin-unrestricted independent particle models. The former/ neglecting spin-polarization effects...