In this paper we give a brief survey on some specific aspects of wavefunction model for chemical bonding which are connected to or have been motivated in part by the work late István Mayer and colleagues. After description early models as reflected Mayer's works, naturally leading electron densities, discuss localized molecular orbitals, summarize initiatives applications. The concept Chemical ...

the objective of this study was to diagnose integrative ecological health of an urban stream,which is located in the asian temperate region. the research approach was primarily based on the index ofbiological integrity (ibi) using fish assemblage and a qualitative habitat evaluation index (qhei). and these indexes were compared with long-term conventional chemical dataset during 1996-2005. for ...