使变质改变（蛋白质的）结构，例如通过加热、加碱、加酸等等，以减少或消除（蛋白质） 原有的某些特性，尤指其生物特性。

To alter the structure of(a protein), as with heat, alkali, or acid, so that some of its original properties, especially its biological activity, are diminished or eliminated.

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复合变质处理使该合金中硅相细化，使布氏硬度提高50%，硬度可达 HB84.9。

The hardness of the alloys which is modified is advanced by about 50%, appropinquity HB84.9.

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加速橡胶密封件老化变质，寿命缩短，甚至丧失其密封性能，使液压系统严重泄漏。

Acceleration rubber seal aging deterioration, loss of life, even loses its sealing property, causes the hydraulic system to divulge seriously.

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