this study examined the adsorption behavior of two cationic dyes used in textile industries (cibasic red 46 and ci basic blue 3) on tunisian clay used in pottery. the ability of pottery clay to remove thebasic dyes from aqueous solution was compared to that of the commercial powdered activated carbon (pac)and raw clay. physicochemical characteristics of these adsorbents were performed by boehm ...

For any given two graphs G and H, we use the notation F→(G,H) to mean that in any red-blue coloring of the edges of F , the following must hold: F contains either a red subgraph G or a blue subgraph H. A graph F is a Ramsey (G,H)minimal graph if F→(G,H) but F∗ 6→(G,H) for any proper subgraph F∗ of F . Let R(G,H) be the class of all Ramsey (G,H)-minimal graphs. In this paper, we derive the prope...

The graph Ramsey number R(G,H) is the smallest integer r such that every 2-coloring of the edges of Kr contains either a red copy of G or a blue copy of H. The star-critical Ramsey number r∗(G,H) is the smallest integer k such that every 2-coloring of the edges of Kr −K1,r−1−k contains either a red copy of G or a blue copy of H. We will classify the critical graphs, 2-colorings of the complete ...

background and objectives: activated carbon is an adsorbent which is mostly employed in order to remove dye from aqueous solutions; however, commercial activated carbon is expensive and this is considered as an obstacle for its usage. therefore, the present study aimed to use waste paper as an inexpensive precursor to produce activated carbon. materials and methods: in the present study, koh wa...

Introduction Let F, G and H be finite, undirected graphs without loops or multiple edges . Write F*(G,H) to mean that it the edges of F are colored with two colors, say red and blue, then either the red subgraph of F contains a copy of G or the blue subgraph contains a copy of H . The class of all graphs F (up to isomorphism) such that F.(G,H) will be denoted by R'(G,H) . This class has been st...

It has been reported that trypan blue, a diazo dye with polyamphipathic structure, can inhibit the coupling of receptors to G-proteins. The present study was carried out to investigate the effect of trypan blue on the actions of adrenoceptor agonists in the guinea-pig atrium. Trypan blue (10 and 100 microM) antagonized the positive inotropic effects of isoprenaline and dobutamine by shifting th...

A 1-plane graph is a graph embedded in the plane such that each edge is crossed at most once. A 1-plane graph is optimal if it has maximum edge density. A red-blue edge coloring of an optimal 1-plane graph G partitions the edge set of G into blue edges and red edges such that no two blue edges cross each other and no two red edges cross each other. We prove the following: (i) Every optimal 1-pl...