It's good and dead, long live zombie poetry.

Excellent -- thanks Derma. If you ever have need of a research assistant, I'll be the first to feign incredulity

So, fixed as in 'not easily (re)moved', presumably (loosely, or even metaphorically) applied to a process that is not easy (or is impossible, to the extent of current knowledge/ability) to be reversed -- like the scrambling of an egg/microwaving of pets/denaturing of proteins, or birth (ouch) & ultimately death?