(from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);
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Despite this diversity and the fact that certain organisms can grow at extremes of the pH scale, generalities can be made.纵然有差异而事实上有些生物是可以在极端的酸碱度范围上生长，仍可以得到一些归纳结果。
High temperatures or extremes of pH make MAbs unravel.They typically expire in weeks unless stored near freezing temperatures.高温和极端的酸碱度都会使抗体瓦解，如果没有冰冻保存，通常数星期就会坏掉。
