A medical drape has at least one suction port disposed. In an exemplary embodiment, high-temperature metal marks are formed to include a conductive material having a melting temperature higher than an annealing temperature used to form such empty-spaced buried patterns. More particularly, it provides means for the controlled oscillation of divalent metal ions, preferably of divalent metal ions such as Cu2, Zn2, Mn2 and Cd2, which are known to destabilize the DNA helix and thereby decrease the melting temperature of the DNA helix. Molecular modeling results indicate that catalysts from organometallic complexes that incorporate anionic 1,3-diboretanyl ligands will rival the performance of traditional metallocenes. These salts are useful, for example, in medicaments that inhibit the aggregation of platelets.