异构现象是非常重要的，因为酶的特异性限制生物体都只能使用两种同分异构体中的一种。
Isomerism is very important because enzyme specificity restricts viable organisms to the use of only one of the TWO forms.
该突变的木糖异构酶 在没有改变原有热稳定性的基础上，提高了对底物D-木糖的特异性。
The said discontinuous xylo-pfan isomerase has improved specificity to the substrate D-wood sugar without changing original heat endurance.
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