There's nothing in biology per se that rules out cell division.

生物学中没有排除细胞分裂的铁规则。

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The Supreme Court has also established several per se rules under which certain government actions will always be deemed to constitute compensable takings.

FORBES: Supreme Court Observations: Takings Ruling a Lump of Coal, Not a Gift, for Landowners

Accordingly, they generally focus their efforts on attempting to demonstrate that they are entitled to compensation under one of the per se takings rules.

FORBES: Supreme Court Observations: Takings Ruling a Lump of Coal, Not a Gift, for Landowners

The Environmental Protection Agency has not outlawed coal per se, but the rules on coal-fired generation have made it less profitable.

FORBES: Coal credits pressured by regulatory issues, coal-to-gas transitions