d Figure 3. Dynamic loading and unloading of a batch-type rotor. (a) and (b); rotor filled via the edge with gradient, light-end first aa B: (c), dense cushion fed to edge m displaces htest gradient a from centre. (d); sample if and overlay O fed to centre, some of cushion displaced. (e); separation phase. (f): unloading by displacement from centre by feeding dense (4)垂直转头:其离心管是垂直放置,样品颗粒的沉降距离最短,离心所需时间 也短,适合用于密度梯度区带离心,离心结束后液面和样品区带要作九十度转向,因 而降速要慢。126 ⑷ 垂直转头：其离心管是垂直放置，样品颗粒的沉降距离最短，离心所需时间 也短，适合用于密度梯度区带离心，离心结束后液面和样品区带要作九十度转向，因 而降速要慢