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AgriLife scientists do groundwork for genetic mapping of algae biofuel species
Date:3/12/2010

ae create vegetable-type oils, the oil from B. braunii, known as botryococcenes, are similar to petroleum.

"The fuels derived from B. braunii hydrocarbons are chemically identical to gasoline, diesel and kerosene," Devarenne said. "Thus, we do not call them biodiesel or bio-gasoline; they are simply diesel and gasoline. To produce these fuels from B. braunii, the hydrocarbons are processed exactly the same as petroleum is processed and thus generates the exact same fuels. Remember, these B. braunii hydrocarbons are a main constituent of petroleum. So there is no difference other than the millions of years petroleum spent underground."

But, a shortcoming of B. braunii is its relatively slow growth rate. While the algae that produce 'vegetable-type' oils may double their growth every six to 12 hours, B. braunii's doubling rate is about four days, he said.

"Thus, getting large amounts of oil from B. braunii is more time consuming and thus more costly," Devarenne said. "So, by knowing the genome sequence we can possibly identify genes involved in cell division and manipulate them to reduce the doubling rate."

Despite these characteristics and economic potential of algae, only six species of algae have had their genomes fully sequenced and annotated, Devarenne said. And B. braunii is not one of the six.

Devarenne and his colleagues have done some of the groundwork in better understanding B. braunii and sequencing its genome.

They are working the Berkeley strain of the B race of B. braunii, so named because it was first isolated at the University of California at Berkeley. The team has determined the genome size and an estimate of the B race's guanine-cytosine content, both of which are essential to mapping the full genome, he said. There are also races A and L of B. braunii, but they were not looked at by the team.

Guanine-cytosine b
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Contact: Robert Burns
rd-burns@tamu.edu
903-312-3199
Texas A&M AgriLife Communications
Source:Eurekalert

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