Words to Describe ultracentrifugation

How ultracentrifugation often is described ("________ ultracentrifugation")

• preparative
• step
• fractional
• analytical
• sequential
• vertical
• differential
• analytic
• speed
• conventional
• equilibrium
• sucrose
• buoyant
• repetitive
• zonal
• discontinuous
• continuous
• isopycnic
• subsequent
• gradient
• extensive
• prolonged