Agriculture
Earth-Friendly Fabrics
Springing forward
Seeds of the Future
Amphibians
Toads
Newts
Salamanders
Animals
A Jellyfish's Blurry View
Lives of a Mole Rat
Chicken Talk
Behavior
Double take
Puberty gone wild
Baby Talk
Birds
Emus
Birds We Eat
Ospreys
Chemistry and Materials
Gooey Secrets of Mussel Power
Bandages that could bite back
Music of the Future
Computers
Programming with Alice
Play for Science
Troubles with Hubble
Dinosaurs and Fossils
A Dino King's Ancestor
An Ancient Spider's Web
Teeny Skull Reveals Ancient Ancestor
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
Slip Slidin' Away—Under the Sea
Watering the Air
Plastic-munching microbes
Environment
The Birds are Falling
To Catch a Dragonfly
Bald Eagles Forever
Finding the Past
Stonehenge Settlement
Sahara Cemetery
Your inner Neandertal
Fish
Bass
Saltwater Fish
Perches
Food and Nutrition
The Color of Health
A Pepper Part that Burns Fat
Packing Fat
GSAT English Rules
Order of Adjectives
Whoever vs. Whomever
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
GSAT stars reap scholarship glory
Results of GSAT are in schools this week
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
GSAT stars reap scholarship glory
Access denied - Disabled boy aces GSAT
GSAT Mathematics
Secrets of an Ancient Computer
Setting a Prime Number Record
Deep-space dancers
Human Body
From Stem Cell to Any Cell
Taking the sting out of scorpion venom
Foul Play?
Invertebrates
Tarantula
Roundworms
Mussels
Mammals
Canines
African Hyenas
Siberian Husky
Parents
Expert report highlights the importance to parents of reading to children!
How children learn
Choosing a Preschool: What to Consider
Physics
Dreams of Floating in Space
Invisibility Ring
Road Bumps
Plants
Fastest Plant on Earth
Pumping Up Poison Ivy
Fungus Hunt
Reptiles
Garter Snakes
Copperhead Snakes
Anacondas
Space and Astronomy
Sounds of Titan
Planning for Mars
Pluto, plutoid: What's in a name?
Technology and Engineering
Switchable Lenses Improve Vision
Supersuits for Superheroes
Morphing a Wing to Save Fuel
The Parts of Speech
Problems with Prepositions
Adjectives and Adverbs
What is a Noun
Transportation
Ready, unplug, drive
Are Propellers Fin-ished?
Revving Up Green Machines
Weather
Arctic Melt
Earth's Poles in Peril
Watering the Air
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™