homopolar

例句：

1. 1. The pH of the solution is 4.6, which is close to the isoelectric point of the protein.
   溶液的pH值为4.6，接近蛋白质的等电点。
2. 2.The isoelectric point of the protein is an important factor in its stability and function.
   蛋白质的等电点是其稳定性和功能的重要影响因素。
3. 3. The isoelectric point of the protein can be adjusted by changing the pH of the solution.
   通过改变溶液的pH值，可以调整蛋白质的等电点。