Tag Archives: Georgia Institute of Technology

Crab Shells and Trees Combine To Create New Food Packaging

From liquid laundry detergent packaged in cardboard to compostable plastic cups, consumer products these days are increasingly touting their sustainable and renewable origins. Now researchers at Georgia Institute of Technology have created a material derived from crab shells and tree fibers that has the potential to replace the flexible plastic packaging used to keep food fresh. The new material, which is described in the journal ACS Sustainable Chemistry and Engineering, is made by spraying multiple layers of chitin from crab shells and cellulose from trees to form a flexible film similar to plastic packaging film.

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The main benchmark that we compare it to is PET, or polyethylene terephthalate, one of the most common petroleum-based materials in the transparent packaging you see in vending machines and soft drink bottles,” said J. Carson Meredith, a professor in Georgia Tech’s School of Chemical and Biomolecular Engineering. “Our material showed up to a 67 percent reduction in oxygen permeability over some forms of PET, which means it could in theory keep foods fresher longer.”

Cellulose, which comes from plants, is the planet’s most common natural biopolymer, followed next by chitin, which is found in shellfish, insects and fungi.

Source: http://www.news.gatech.edu/

How To Turn On Cancer-Killing Immune Cells

A remote command could one day send immune cells on a rampage against a malignant tumor. The ability to mobilize, from outside the body, targeted cancer immunotherapy inside the body has taken a step closer to becoming reality. Bioengineers at the Georgia Institute of Technology have installed a heat-sensitive switch into T-cells that can activate the T-cells when heat turns the switch on. The method, tested in mice and published in a new study, is locally targeted and could someday help turn immunotherapy into a precision instrument in the fight against cancer.

Immunotherapy has made headlines with startling high-profile successes like saving former U.S. President Jimmy Carter from brain cancer. But the treatment, which activates the body’s own immune system against cancer and other diseases, has also, unfortunately, proved to be hit-or-miss.

In patients where radiation and traditional chemotherapies have failed, this is where T-cell therapies have shined, but the therapy is still new,” said principal investigator Gabe Kwong. “This study is a step toward making it even more effective.”

Cancer is notoriously wily, and when T-cells crawl into a tumor, the tumor tends to switch off the T-cellscancer-killing abilities. Researchers have been working to switch them back on.

Kwong’s remote control has done this in the lab, while also boosting T-cell activity. In the study, Kwong’s team successfully put their remote-control method through initial tests in mice with implanted tumors (so-called tumor phantoms, specially designed for certain experiments).

Source: http://www.rh.gatech.edu/