Education is by nature a process of change and growth. “Learning” implies movement from one status to another, “before knowing” “now knowing.” Longitudinal research, which involves the stud...

The problem of existence of a tree satisfying a given set of constraints on its vertices is considered. Specifically, given finite set of constraints P = {p1, p2, ..., pn}, we ask if there is an efficient algorithm to build a line-tree T = (V, E) such that for every constraint pi = (ab)(cd), where a, b, c, d are arbitrary elements of V , the path (ab) does not share any vertices with the path (...

antivenoms have been used successfully for more than a century and up to now constitute the only effective treatment for snakebites .the production of antivenin started long time ago when the calmette was prepared the antivenom in 1894.the method currently used to prepare antivenom by most of the manufacturers are originated from the method of pope which was develop in 1938. several new appr...