指数: index number; index密度: density; thickness梯度: gradient; grad指数密度: exponential density静密度梯度: static density gradient密度梯度: de ity gradient; density gradients密度梯度法: density gradient menthod密度梯度管: density gradient column; density gradient tube密度梯度柱: density gradient column指数密度函数: exponential density function连续密度梯度: continuous density gradient; gradient of continuous density密度梯度电泳: density gradient elecrophoresis; density gradient electrophoresis密度梯度分离: desity gradient separation密度梯度离心: density gradient centrifugation; density gradientcentrifugation; density gradine centrifugation; gradient centrifugation density; isodensity centrifugation平衡密度梯度: equilibrium density gradient人口密度梯度: pophulaion de ity gradient; pophulaion density gradient; pophulaionde itygradient稳定密度梯度: stable density gradient线性密度梯度: linear density gradient蔗糖密度梯度: sucrose density gradient等密度梯度离心: isopycnic gradient centrifugation; isopycnic gradient centrifugaton非连续的密度梯度: discontinuous density gradient密度梯度不稳定性: density gradient instability密度梯度沉降法: density gradient sedimentation method密度梯度沉降平衡: density gradient sedimentation equilibrium密度梯度沉降速度: density gradient sedimentation velocity