Take Michael Raab, whose start-up, Agrivida, in Medford, Mass., is tinkering with the genes of grass and sorghum to develop plants that make the enzymes internally and digest their own cellulose on cue, leaving behind a murky brown concoction of sugars that can be converted into gasoline, diesel or jet fuel.
Deep inside their cells, his plants produce a smooth, nonreactive molecule, but when the plant is exposed to heat and a change in acidity, the molecule breaks open, like a beer bottle smashed against the bar. The jagged edges are enzymes. They rip apart cell walls and leave fragments that are useful sugars.
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