Agriculture
Springing forward
Chicken Eggs as Drug Factories
Cleaning Up Fish Farms
Amphibians
Salamanders and Newts
Tree Frogs
Salamanders
Animals
Pothole Repair, Insect-style
The Secret Lives of Grizzlies
How to Fly Like a Bat
Behavior
Seeing red means danger ahead
Mice sense each other's fear
Supersonic Splash
Birds
Songbirds
Emus
Macaws
Chemistry and Materials
Meteorites may have sparked life on Earth
Flytrap Machine
Butterfly Wings and Waterproof Coats
Computers
Toxic Dirt + Avian Flu = Science Fair Success
Electronic Paper Turns a Page
New twists for phantom limbs
Dinosaurs and Fossils
Have shell, will travel
A Really Big (but Extinct) Rodent
The Paleontologist and the Three Dinosaurs
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Life trapped under a glacier
Plastic-munching microbes
Petrified Lightning
Environment
Fishing for Fun Takes Toll
A 'Book' on Every Living Thing
An Ocean View's Downside
Finding the Past
Ancient Cave Behavior
Watching deep-space fireworks
Untangling Human Origins
Fish
Mahi-Mahi
Skates
Perches
Food and Nutrition
Building a Food Pyramid
Sponges' secret weapon
Moving Good Fats from Fish to Mice
GSAT English Rules
Who vs. That vs. Which
Pronouns
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
Ministry of Education Announces 82 GSAT Scholarships for 2010
Results of GSAT are in schools this week
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
GSAT Exams Jamaica Scholarships
GSAT Scholarship
GSAT Practice Papers | GSAT Mathematics | Maths
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
A Sweet Advance in Candy Packing
Deep-space dancers
Math of the World
Human Body
Sea Kids See Clearly Underwater
Fighting Off Micro-Invader Epidemics
Workouts: Does Stretching Help?
Invertebrates
Mollusks
Giant Clam
Ticks
Mammals
Minks
Killer Whales
Chinchillas
Parents
Children and Media
Raise a Lifelong Reader by Reading Aloud
Expert report highlights the importance to parents of reading to children!
Physics
Powering Ball Lightning
The Mirror Universe of Antimatter
The Particle Zoo
Plants
Fast-flying fungal spores
Fungus Hunt
Pumping Up Poison Ivy
Reptiles
Anacondas
Caimans
Crocodiles
Space and Astronomy
Roving the Red Planet
Icy Red Planet
Catching a Comet's Tail
Technology and Engineering
Space Umbrellas to Shield Earth
Crime Lab
Switchable Lenses Improve Vision
The Parts of Speech
Adjectives and Adverbs
What is a Noun
Problems with Prepositions
Transportation
Middle school science adventures
Where rivers run uphill
Robots on the Road, Again
Weather
A Dire Shortage of Water
Weekend Weather Really Is Different
Where rivers run uphill
Add your Article

Microbes at the Gas Pump

 

Scientists searching for an Earth-friendly alternative to gasoline are looking in some of the weirdest places—termite guts, cow stomachs, and rotting logs. These researchers are hunting for bacteria and fungi that can help turn plant waste into a liquid fuel called ethanol.

Many vehicles run on fuels made of a blend of gasoline and ethanol. Experts at the U.S. Department of Energy say that using more ethanol would help reduce our dependence on fossil fuels.

To produce enough ethanol to meet our energy needs, researchers are developing methods to turn plant parts into ethanol. They’re members of a growing movement to use renewable resources, such as plants, to provide energy.

“There’s leftover plant material everywhere,” says Jared Leadbetter. “There are rice hulls, sawdust, wood chips—plant material that’s full of energy.” Leadbetter is a microbiologist at the California Institute of Technology in Pasadena.

To tap this energy supply, scientists and engineers are turning to microbes to convert huge amounts of waste plant material into ethanol for cars.

Breaking down sugars

When tiny organisms such as yeast break down sugars to obtain energy, they produce ethanol. This process is called fermentation.

Scientists and engineers have been using fermentation for years to make ethanol from kernels of corn. But there’s a lot more to a corn plant than just the kernel. Corn plants include stalks, leaves, and the cob that’s left behind after the kernels are removed.

The trouble is that stalks, leaves, and other plant parts contain a complex molecule called cellulose. It’s a tough molecule to break down. In fact, our bodies can’t even digest it.

But breaking down cellulose into sugar molecules is a key step in making ethanol from the nearly 430 million tons of plant waste produced on farmland every year.

Fortunately, some organisms make compounds called enzymes that can digest, or break down, cellulose. Scientists hope to use such enzymes to produce ethanol.

Termite stomachs

Scientists are looking for these cellulose-busting enzymes in unusual places—termite stomachs, for example.

Most people think of termites as pests because of the damage that they do to homes and other structures. But termites harbor more than 100 species of bacteria in their guts—bacteria that may help us make ethanol from plant waste.

These microbes digest cellulose and other complex molecules in wood. Without their bacteria, termites wouldn’t be able to survive on their woody diet.

Leadbetter and his coworkers at the U.S. Department of Energy’s Joint Genome Institute are studying the genes of microbes that produce wood-digesting enzymes. Made up of molecules called DNA, genes determine such traits as the shape of a plant leaf, the color of an animal’s coat, or the texture of a person’s hair.

“We are making a toolbox of wood-degrading enzymes and we want to tap it to obtain enzymes for making ethanol,” Leadbetter says.

Once they find the genes that control the enzymes that digest wood and those that produce ethanol, Leadbetter and his team hope to genetically modify bacteria to do both steps.

Cow stomachs

The dark depths of a cow’s stomach are home to cellulose-munching microbes as well, says Paul Weimer. He’s a research scientist with the U.S. Department of Agriculture Dairy Forage Center in Madison, Wis.

“Cows are natural processors,” Weimer says. “They make their living by eating plants, and bacteria carry out their fiber digestion.”

Weimer says that the bacteria in a cow’s stomach produce many different enzymes that break down the cellulose in grass and other plants in a cow’s diet.

These bacteria hold cellulose-digesting enzymes on their cell surfaces in a structure called a cellulosome. What’s more, the bacteria attach themselves to cellulose fibers in the cow’s stomach and digest them on the spot.

“The bacteria basically glue themselves to the fiber and begin digesting it,” Weimer says. “It works like a disassembly line that takes apart the cell wall.”

Right now, making ethanol from cellulose is expensive. Enzymes are costly to make, and current methods for breaking down cellulose require a lot of energy.

“If we could re-create the activity of the cellulosome,” Weimer says, “we could greatly increase the efficiency and improve the economics of digesting cellulose.”

Increasing production

Another common wood digester is a fungus called Trichoderma reesei. By producing cellulose-digesting enzymes, this fungus breaks down logs in the forest and causes “jungle rot,” which ruins tents and other fabrics in the tropics.

At least one company has developed strains of this fungus that can churn out huge quantities of enzymes.

Advances in ethanol production can’t come soon enough. Last year, President Bush signed a law requiring 7.5 billion gallons of biofuels such as ethanol to be blended with gasoline by 2012. That’s almost twice the amount of ethanol that we produce from corn today.

Maybe, by the time you get your driver’s license, you’ll be fueling up at the ethanol pump.


 

Microbes at the Gas Pump
Microbes at the Gas Pump








Designed and Powered by HBJamaica.com™