A topological index is a real number related to the structure of a connected graph G and is invariant under graph automorphism. Let G be a (molecular) graph possessing n vertices and m edges, and e=x,y be an edge of G and x, y are two of its vertices, then the distance d(x,y)=d(x,y|G) between the vertices x and y is equal to the length of the shortest path that connects them in G. The goal of t...

The Schultz molecular topological index (MTI) is compared with the Wiener index (W) of a molecular graph. It is shown that 2VminW < MTI e 4VmaxW holds for any (connected) graph Γ, with Vmin and Vmax denoting the smallest and the largest valency, respectively, of the vertices of Γ. For molecular graphs these bounds can be further improved. For instance, for benzenoid systems we have the followin...

Studies show that the adsorption of rabbit antiovalbumin-I(131) on guinea-pig ileum conforms to a Langmuirian isotherm, and that the physiological response to challenge with antigen depends upon the amount of antibody bound to the tissue.

soil contamination significantly reduces environmental quality and affects human health. to investigate and assess the effects of land use on the concentrations of some heavy metals in surface soils of golestan province, 227 soil samples (0-60 cm) were collected from three types of land uses including agricultural lands, natural, and industrial areas. the total metals and metalloids (cr, se, as...

1619. [4] Schultz, P. H. (1992) JGR 97, 11,623-11662. [5]Barnouin-Jha, O. and Schultz, P. H. (1996) JGR 101, 21,099-21,115. [6] Barnouin-Jha, O. and Schultz, P. H. (1998) JGR 103, 25,739-25,756. [7] Barnouin-Jha, O. and Schultz, P. H. (1999) Int. Jour. Impact Eng. 23, 32-39.[8] Schultz, P. H. and Lutz, A. B. (1988) Icarus 73, 91-141. [9] Grant, J. and Schultz, P. (1990)Icarus 84, 166-195. [10] ...