| preparative regimen | <oncology> The chemotherapy and/or radiation given to BMT patients prior to transplant to kill diseased cells and/or make space for healthy new marrow and/or suppress the immune system so graft rejection does not occur. (31 Dec 1997) |
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| ultracentrifuge | A high-speed centrifuge (up to 100,000 rpm) by means of which large molecules, e.g., of protein or nucleic acids, are caused to sediment at practicable rates; used for determinations of molecular weights, separation of large molecules, criteria of homogeneity of large molecules, conformational studies, etc. (05 Mar 2000) |