The reaction rate is limited by the concentration gradient of oxygen in the sample . 反应速率受试样中氧浓度梯度的限制。
They must be able selectively to allow certain molecules or ions to enter across this barrier, often against concentration gradients . 这必须能选择性地让某些分子或离子(常常是逆着浓度梯度)通过这个屏障。
We may assume that there is no correlation between the local velocity of a liquid particle at a mathematical point inside the void space and the concentration gradient . 我们可以假定,在空隙空间的一个数学点上液体质点的局部速度和浓度梯度之间无相关性。
A simple method of preparing concentration gradient gel 浓度梯度胶制作方法改良研究
Substrates may accumulate intracellularly against a concentration gradient 底物可以逆浓度梯度而积聚于细胞内。