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In Microbe, Vast Power For Biofuel
Leschine says her microbe has the advantage of performing both the breakdown of plant fibers and the production of ethanol. "Creating one microbe that does what enzymes and fermentation do is regarded as the Holy Grail because of the savings in costs," she said.
For the microbe, the plant fibers are food while ethanol and carbon dioxide are waste products. "These are tiny little cells we can't even see. They don't have mouths. How do they do it?" she said with a sense of wonder.
Whether SunEthanol will succeed remains unclear, but it is a good example of the hopes and hurdles for companies in the cellulosic biofuel business. Many of those firms rely on the research, and serendipity, of scientists like Leschine.
For years, Leschine scoured soil samples from around the world in search of the perfect microbe, one that would excel at breaking down what nature casts on the ground in damp places like the reservoir. When friends or colleagues traveled, she would ask them to bring back soil in jars or old plastic film canisters.
Yet the best microbe may have been here all along, lurking near some ferns and an old stone dam just 20 minutes from her university lab. She has dubbed it the Q microbe for the Quabbin Reservoir.
Apart from its lollipop appearance, it didn't stand out at first. But the more she tested it, the more unusual it seemed. Most microbes have about 20 machine-like proteins for absorbing sugars; the Q microbe has more than 100 for various nutrients, half of them for sugars, she says. The Q microbe also works in moderate temperatures, making it useful for manufacturing.
Leschine's interest predates the current fervor over biofuels. Since her graduate school days, she has been interested in the role of microbes in the carbon cycle. On the shelves of her office sit beanbags in the shapes of microbes. In a corner stands a bag of dirty cornstalks.
"The last thing in the world I wanted to do was start a company," Leschine said as she stood next door to her lab, where an assistant heated mixtures in test tubes. "It seemed like more of a distraction."
Then she talked to someone teaching business at the university, and he and a group of venture capitalists persuaded her to commercialize it. She came to feel that it was her obligation because she had received Energy Department research grants.
Next came lengthy negotiations with the university, which owned the intellectual property rights for work done in its labs. SunEthanol negotiated an exclusive licensing agreement with the university, which owns the patent.
The Q microbe's future hinges on the SunEthanol founders' skill at navigating talks like this to raise more money and persuade ethanol makers to use the Q microbe instead of a competing bug or enzyme. A small business is like Leschine's test tube samples, and scaling it up is no science. SunEthanol's chief executive Jef Sharp knows that from experience. He started a successful clothing firm. Later, he started X-S Capacity, which he called a sort of eBay for excess manufacturing capacity. It flopped. More recently, he launched Tech Cavalry, which provides computer support for individuals and businesses. This time, he says, "the wind is at our backs."
SunEthanol has received help from the Energy Department in mapping the genetic code of the Q microbe. The firm also hopes to receive an Energy Department grant through a program to help small businesses. "It could be lifeblood for us," said Jonathan Gorham, SunEthanol's marketing director.
SunEthanol's founders fear that the regulations are written in a way that will restrict federal funding to enzyme development, not microbe development. They have lobbied the Energy Department and members of Congress to make sure their work will be considered.
Next SunEthanol must figure out how to go from working with a liter or two of Q microbes in the lab to churning out millions of gallons of the microbe. VeraSun, for example, has fermentation vats that are more than 100,000 gallons each. SunEthanol must also test temperature and acidity conditions for the Q microbe, which will be expected to break down plant material very different from what it consumes near Quabbin's shore.
VeraSun's Honnef hopes that cellulosic ethanol plants can be built next door to the company's corn ethanol distilleries. Those distilleries use kernels and leave the rest, known as corn stover. The corn stover is largely waste material now but shows cellulosic possibilities.
"The conversion of cellulosic material to ethanol has been proven out in a lab," Honnef said. "The challenge is that it can't be done today on a commercial basis on a large scale."
Leschine is hopeful. "What we've demonstrated is that if you go out and look in nature, you can find a microbe that does what you want to do," she said. "The advantage of working with a natural microbe is that . . . you don't have to do all the complicated genetic engineering."
But she knows that she doesn't know much about engineering or big industry. She notes the dirty cornstalks in her office. They are there, she said, "to remind me that this is a daunting task."