第二种技术依赖于诱发电位；根据它们的源头，诱发电位是一种可能与特定的刺激相关的脑电反应。

The second technique relies on evoked potentials, which are electrical brain responses that may be related to a particular stimulus because of where they originate.

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如果溶液远离这个等电位点，那么蛋白质会是高度可溶的因此表面张力梯度就无法形成；如果太接近这个等电位点，蛋白质会析出沉淀。

If the solution is too far from the IEP, the proteins are highly soluble and surface tension gradients never develop; too close, and the proteins precipitate out.

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此外，设计并应用了电位控制和测量电路，实现了对传感器的电位控制以及输出信号的处理。

Moreover, the potential control circuit and signal measuring circuit are designed and applied in controlling potential and processing the output signal of the sensor.

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When we measure EKG's, what we're measuring is the activity of all these cells within our heart performing action potentials.

当我们做心电图的时候,我们所测量的是心脏内能发出,动作电位的细胞的活动状态

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Now, in the heart action potential is moving from one heart muscle cell to another over the surface of the heart.

心脏中的动作电位,沿相邻心肌细胞在心脏表面传递

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So essentially, they regulate this action potential, and they do so by helping to establish and then control the voltage gradient within the cells.

总之本质上，它们负责调节动作电位,它们做到这一点通过协助制造,并控制细胞内的电位梯度。

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