A centrifuge bowl for separating heavier particles from lighter particles and water comprises a conical lead-in wall leading of the bowl to a single recess or a pair of annular recesses at axially spaced positions. There can be provided a method enabling easy and uniform production of a diamond film showing a low electric resistivity value with good reproducibility and few problems concerning handling such as serious bad influence on human bodies and explosiveness during the doping process. A preferred example of a restenosis inhibitor is cerivastatin. The user’s trust client connects to an authentication service and identification credentials of the required type and format are generated. The database is then made available via an online data marketplace which allows users from different organizations to buy and sell related data, associated advertisements, and access to the communities of end-users who may also view advertisements and make purchases.