Isometric subgraphs of hypercubes, or partial cubes as they are also called, are a rich class of graphs that include median graphs, subdivision graphs of complete graphs, and classes of graphs arising in mathematical chemistry and biology. In general one can recognize whether a graph on n vertices and m edges is a partial cube in O(mn) steps, faster recognition algorithms are only known for med...

In this paper, we solve a problem posed by the late Rodica Simion regarding type B Gram determinants, cf. [5]. We present this in a fashion influenced by the work of W.B.R.Lickorish on Witten-Reshetikhin-Turaev invariants of 3-manifolds. We will give a history of this problem in a sequel paper in which we also plan to address other related questions by Simion [6, 5] and connect the problem to F...

introduction: bone marrow transplantation is a good therapeutic modality for beta thalassemia. liver complications are one of the major causes of morbidity and mortality following bmt. determination of the factors of liver injury leads to earlier  diagnosis after bmt and improves prognosis. method: we studied 113 major beta thalassemic patients who have been transplanted from 1990- 2000 in bone...