There are several organizations which are on the verge of trying to
produced cellulose ethanol in commercial quantities.
An image of artificially -
produced cellulose in cells on the surface of a modified Arabidopsis thaliana plant.
Leaving the material in a sealed container for a few days «nicely
produced a cellulose film on top of the printed structure,» says study coauthor Patrick Rühs, a food scientist also at ETH Zurich.
Escherichia coli and many other bacteria
produce cellulose as a key component of the extracellular matrix that coats the cells to form a biofilm, a complex multicellular community consisting of numerous bacteria, exopolysaccharides (like cellulose), protein fibers, and DNA (4 — 6).
Dr Sameer Rahatekar, lead author from the University's Advanced Composite Centre for Innovation and Science (ACCIS), added: «We used ionic liquids for the first time to
produce cellulose and silk scaffolds for stem cells differentiation.
The resulting film also appeared less resistant to microorganisms that
produce cellulose - destroying enzymes.
One of the sub-goals of the project is to
produce cellulose based materials for full - scale 3D printing, which can be anything from printing weather - stripping and doors, to walls and, in the end, complete houses.
The organism uses a surprisingly small number of genes to
produce its cellulose - munching enzymes.
Looking for weedy candidates The research represents just one of several ways scientists are altering plants to maximize their ability to
produce cellulose and hemicellulose for biofuels, said Laura Bartley, an assistant professor in the Department of Microbiology and Plant Biology at the University of Oklahoma.
Originally DOE had the wrong approach, by offering free money to anyone who claimed they could
produce cellulose ethanol.
Not exact matches
Another quick - maturing technology, which Canadian firm Iogen is pioneering, is
cellulose ethanol, a fuel made from crop and forest residues and urban wastes that could be locally
produced in rural British Columbia.
Cermount
produces tri-layer stand up pouch using renewable
cellulose and sugar cane.
As the tree matures, it typically stops
producing fruit with this stressed - out, overabundance of
cellulose fibers.
Cooking
produce softens the
cellulose or breaks it down completely, making the food much easier to digest.
This is because fresh
produce contains a substance called
cellulose.
Refers to a class of enzymes
produced chiefly by fungi, bacteria, and protozoans that catalyze the hydrolysis of
cellulose.
A biochemical addition to the
cellulose produced by E. coli and other species of bacteria lets them create colonies that are resistant to disruption, researchers report in the Jan. 19 Science.
The researchers demonstrated this idea by mixing up a batch of ink laced with the
cellulose -
producing bacteria Acetobacter xylinum and printing a patch in the precise shape of a doll's face.
The compound, called gavinone in honor of its codiscoverer, is
produced when
cellulose, the sugar that makes up the cell walls of all plants, burns.
Cellulose is only made on the surface of the hydrogel because that is where most of the oxygen is — therefore, the method
produces thin coatings suitable for wound treatment.
For example, Keasling and his team cloned genes from Clostridium stercorarium and Bacteroides ovatus — bacteria that thrive in soil and the guts of plant - eating animals, respectively — which
produce enzymes that break down
cellulose.
Perhaps more importantly, the researchers have also imported genes that allow E. coli to secrete enzymes that break down the tough material that makes up the bulk of plants —
cellulose, specifically hemicellulose — and
produce the sugar needed to fuel this process.
Cellulose fibers
produced by the model organism Komagataeibacter (Gluconacetobacter) xylinus are very similar to those found in plants (1) and are increasingly used in biotechnology and nanotechnology (2, 3).
Synthetic biology has allowed scientists to tweak E. coli to
produce fuels from sugar and, more sustainably,
cellulose
Nanocrystalline
cellulose (NCC), which is
produced by processing wood pulp, is being hailed as the latest wonder material.
The project will investigate formation of a value
producing network of enterprises around
cellulose - based material which includes, among others, design - sector companies.
«We can do this while simultaneously
producing from the biomass lignin - free
cellulose, which is the basis of ethanol and other liquid fuels.
Finding a cost - effective method for breaking down the tough
cellulose in plant matter to
produce ethanol has been a tough challenge, involving both innovations in chemistry and in field operations like the baling feeder developed by Woodford.
This gene gives instructions for an enzyme that attaches the appendage to the glucose chain after it's
produced, altering the
cellulose just before it leaves the cell.
The WSU and Chinese team developed a new kind of air filtering material that uses natural, purified soy protein and bacterial
cellulose — an organic compound
produced by bacteria.
Together the two plants would
produce, at best, 22 million gallons of ethanol a year by using sulfuric acid to break the lignocellulose bonds and then burning the leftover lignin to power fermentation of the
cellulose into ethanol.
But when the researchers genetically engineered the bacteria to
produce unmodified
cellulose, the
cellulose formed shorter fibers.
Other species of bacteria, such as Salmonella, also
produce the modified
cellulose, Cegelski and her team found.
A textile sample was
produced from the
cellulose fiber in collaboration with Aalto University's Department of Design.
Phosphoethanolamine
cellulose: A naturally
produced chemically modified
cellulose.
Like the beetle scales, the
cellulose membranes are extremely thin: just a few millionths of a metre thick, although the researchers say that even thinner membranes could be
produced by further optimising their fabrication process.
Despite its great strength, Berglund's «nanopaper» is
produced from a biological material found in conventional paper:
cellulose.
The shear forces
produced cause the
cellulose to gently disintegrate into its component fibres.
«The bulk of the world's
cellulose is
produced within the thickened secondary cell walls of tissues hidden inside the plant body,» says University of British Columbia Botany PhD candidate Yoichiro Watanabe, lead author of the paper published this week in Science.
«Armed with the rcdA variant, we were able to engineer a strain of E. coli that could not only tolerate ionic liquid, but that could also
produce ionic - liquid - tolerant enzymes that chew up the
cellulose, make sugars, eat it and make biofuels,» said Frederix.
Some compounds
produced by the degradation and break down of
cellulose are known to promote plant growth.
The reason: Brazil's sugarcane mills
produce huge quantities of cheap
cellulose in the form of sugarcane straw, a byproduct.
They employed a strain of Trichoderma reesei, which
produces sufficient amounts of the enzymes necessary to dissolve
cellulose.
Iogen Corporation has furthered this technology by developing enzymes to convert tough, sugar - bearing
cellulose in inexpensively
produced agricultural waste into ethanol (opposite page, top).
Lignocellulosic waste such as sawdust or straw can be used to
produce biofuel — but only if the long
cellulose and xylan chains can be successfully broken down into smaller sugar molecules.
Biofuel manufacturing uses the Trichoderma fungus, which
produces enzymes that are capable of breaking down the
cellulose and xylan chains into sugar molecules.
A team led by Richard Williamson of the Australian National University in Canberra noticed that a mutant Arabidopsis variety
produced much less
cellulose when grown in soil that was hotter than normal — 31 degrees Celsius instead of 18.
Now, Brazil hopes to tap into a new biofuel source: second - generation ethanol,
produced from the tough
cellulose in plant stalks.
But cows, rabbits, and other grass - munching creatures are able to extract calories from it, because they have bacteria living in their guts that
produce enzymes that strip
cellulose down to its component elements.
For now, the bugs still
produce only about one - tenth of the enzymes they need to break
cellulose and hemicellulose, and the amount of fuel they generate is low.