They didn't make it clear but it should apply to both types of production. The yeast eats starch (or sugars) and gives off ethanol as a waste product but eventually dies in its own waste. The idea is to give them greater tolerance to ethanol so they can survive to produce more of it. If successful, it will lower the cost of ethanol because you will get more ethanol from the same amount of yeast which will use less energy (which will also make it less carbon intensive).

The difference between cellulosic and corn ethanol production is basically that corn starch is easy to turn into sugar but cellulose is not. But, once you get the sugar, both methods then use yeast to ferment the sugar (it eats the sugar and craps ethanol). This last part of the process is the same for both methods.

In the end, it all comes down to biodiversity. Help acquire and protect ecological hotspots, give to a conservation organization: http://www.saveourbiodiversity.com

with a link to the online magazine for subscribers. I usually read it on line. I go  narcoleptic when I try to read the paper version.

In the end, it all comes down to biodiversity. Help acquire and protect ecological hotspots, give to a conservation organization: http://www.saveourbiodiversity.com