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The visible portion of two intersecting atoms is exactly calculated to be bounded by a circular arc and an elliptic arc. The elliptic arc can be approximated either by a circular arc or by a cubic Bezier curve. Using one shaded template for each atom type and stamping the templates in a mask bitmap delineated by these curves, images are generated rapidly.
Single crystals of two polymorphic and four solvated crystalline forms of spironolactone (C24H32O4S) were obtained using different solvents. The morphology, symmetry, and crystallographic parameters were determined for all crystal forms except for the one obtained from methanol. The stability and transformation of each type of crystal were studied by DSC,… (More)