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American Chemical Society's Weekly PressPac -- April 30, 2008


Fighting global warming at the dinner table
Environmental Science & Technology

Substituting chicken, fish, or vegetables for red meat just once a week can help combat climate change even more dramatically than buying locally sourced food, according to scientists in Pennsylvania who studied the environmental impacts of food production and distribution in the United States. The study is scheduled for the May 15 issue of ACSs bi-weekly journal Environmental Science & Technology.

In the study, Christopher L. Weber and H. Scott Matthews explain that environmental advocates and retailers have urged customers to purchase goods from local sources to minimize environmental impacts. Despite this emphasis on buying local, the researchers point out that few studies in the U. S. have compared greenhouse gas emissions from food production to those of transportation.

Weber and Matthews found that the production phase dominates the average U.S. households greenhouse-gas burden contributing 83 percent of them whereas transportation accounts for only 11 percent. Red meat, according to the report, is almost 150 percent more greenhouse-gas-intensive than chicken or fish.

Thus, we suggest that dietary shift can be a more effective means of lowering an average households food-related climate footprint than buying local, the paper says. Shifting less than one day per weeks worth of calories from red meat and dairy products to chicken, fish, eggs, or a vegetable-based diet achieves more greenhouse-gas reduction than buying all locally sourced food. JS

Food-Miles and the Relative Climate Impacts of Food Choices in the United States


Christopher L. Weber
Carnegie Mellon University
Pittsburgh, Pa. 15213
Phone: (412) 268-5550


New insights on link between early consumption of cows milk and Type-1 diabetes
Journal of Proteome Research

Researchers in Maine report a new explanation for the mysterious link between consumption of cows milk protein in infant formula early in life and an increased risk of later developing Type-1 diabetes. A protein in cows milk that triggers an unusual immune response appears to be the main culprit, they say. The study is scheduled for the June 6 issue of ACS monthly Journal of Proteome Research.

In the new study, Marcia F. Goldfarb points out that several studies have reported a possible link between the early introduction of cows milk protein into an infants diet and subsequent development of the disease. In Type-1 diabetes, the immune system erroneously appears to attack and destroy insulin-producing cells in the pancreas. It usually begins in childhood, requires insulin injections, and afflicts about 800,000 people in the U.S. alone. Scientists do not understand the link between cows milk and diabetes. They know, however, that beta-lactoglobulin, a protein present in cows milk but not found in human breast-milk, is structurally similar to the human protein glycodelin, which controls the production of T-cells. T-cells help guard the body against infection.

Goldfarb describes research on patients with Type-1 diabetes, which suggests that an infants immature immune system may inadvertently destroy glycodelin in an effort to destroy the similar cows milk protein, which the system recognizes as foreign. This could result in the overproduction of T-cells, which can attack the insulin-producing cells of the pancreas and trigger diabetes, she says. MTS

Relation of Time of Introduction of Cow Milk Protein to an Infant and Risk of Type-1 Diabetes Mellitus


Marcia F. Goldfarb
Portland, Maine 04104
Phone: 207-883-0770
Fax: 207-772-5644


Boosting mussel power: New technique for making key marine mussel protein
Biotechnology Progress

Researchers in Korea report development of a way to double production of a sticky protein from marine mussels destined for use as an antibacterial coating to prevent life-threatening infections in medical implants. The coating, produced by genetically-engineered bacteria, could cut medical costs and improve implant safety, the researchers say. Their study is scheduled for the June 6 issue of ACS Biotechnology Progress, a bi-monthly publication.

Bacterial infection of medical implants, such as cardiac stents and dialysis tubing, threatens thousands of people each year and is a major medical challenge due to the emergence of antibiotic-resistant bacteria. Several research groups are working on long-lasting, germ-fighting coatings from mussel proteins, but production of these coatings is inefficient and expensive.

Hyung Joon Cha and colleagues previously developed a way to use genetically engineered E. coli bacteria to produce mussel adhesive proteins. Now they report adding a new gene for producing Vitreoscilla hemoglobin (VHb), a substance that boosts production of proteins under low-oxygen conditions. Adding the VHb gene to the engineered E. coli doubled the amount of mussel proteins produced, which could lead to more cost-effective coatings, the researchers say. MTS

Enhancement of Mussel Adhesive Protein Production in Escherichia coli by Co-expression of Bacterial Hemoglobin


Hyung Joon Cha, Ph.D.
Pohang University of Science and Technology
Pohang, Korea
Phone: 82-54-279-2280
Fax: 82-54-279-2699


Munch-o-matic: Scientists develop the artificial mouth
Journal of Agricultural and Food Chemistry

For years scientists have tried to build an electronic tongue, a robotic tasting device that could have profound applications in improving food quality and safety. But before machines learn to taste their food, they first need to learn how to chew it. In a study scheduled for the May 14 issue of ACS bi-weekly Journal of Agricultural and Food Chemistry, scientists report the design of an artificial mouth that mimics the first vital steps of human digestion chewing, saliva release and the initial breakdown of food.

In the study, Galle Arvisenet and colleagues point out that a number of factors are involved in the release of aromatic and flavor compounds in the mouth. Chewing, the release of saliva, the rate of food breakdown and the temperature all affect the flavor and smell of food before its swallowed. To accurately reproduce the effects of chewing, Arvisenet's team needed to build a machine that could imitate several if not all of these subtle processes. Our aim was not to reproduce the human mouth conditions exactly, but to reproduce the result of mastication, says Arvisenet.

The researchers compared apples chewed by their machine and by human mouths. The resulting apple pulp was scrutinized for texture, color and aromatic compound release. Experimental conditions were determined that produced fruit in a state closest to that obtained after mastication in a human mouth, reports Arvisenet. AD

"Effect of Apple Particle State on the Release of Volatile Compounds in a New Artificial Mouth Device"


Galle Arvisenet, Ph.D.
Nantes, France
Phone: 33-251-78-5512
Fax: 33-251-78-5520


No more needles: Toward an artificial pancreas for fighting diabetes
Chemical & Engineering News

A specially coated metal tube, no larger than a cigarette, could be the key to developing an artificial pancreas to help millions of people with diabetes avoid insulin injections, according to an article [] scheduled for the May 5 issue of Chemical & Engineering News, ACS weekly newsmagazine. The so-called bioartificial pancreas also could help keep blood sugar closer to normal levels, and perhaps reduce the risk of diabetic complications, which include blindness, kidney failure, and premature death, the article suggests.

Written by Associate Editor Bethany Halford, the C&EN article points out that researchers have been trying to develop an artificial pancreas for years. Most approaches involve encapsulating healthy islet cells the pancreatic cells that detect glucose and release insulin and transplanting them into diabetic patients. But enclosing a large collection of cells has been difficult because the materials designed to hold them are not biocompatible, or optimal for use in the body, Halford notes.

The new device, developed by Joseph P. Kennedy and colleagues at the University of Akron in Ohio, is coated with a permeable polymer membrane that is key to its success. In addition to improving the exchange of insulin and glucose between the islet cells and the blood, the polymer membrane helps increase the supply of oxygen to the cells for improved function and lifespan. The device itself has already shown promise in preliminary animal studies and researchers are looking ahead to clinical trials in humans, the article notes.

Perfecting an artificial pancreas

This story will be available on May 5 at

Michael Bernstein
ACS News Service
Phone: 202-872-6042
Fax: 202-872-4370

Journalists Resources

Press releases, chat room sessions, and more from ACS 235th National Meeting

Its never too late to explore a treasure trove of news sources, background material and story ideas available from the ACS latest National Meeting, which was held in New Orleans from April 6-10, 2008. Reporters can view press releases, search an archive with abstracts of more than 9,000 scientific presentations and hundreds of non-technical summaries of those presentations, and access other resources at: or

The ACS Office of Communications also offers recorded video versions of its national meeting chat room briefings and accompanying chat transcripts by going to To use this site, you must first register with by going to Its free and only takes a minute or two to sign up. To view the archived chat room sessions, proceed by clicking the Login button at the top right of the Ustream window and then selecting Past Clips. Please note that Ustream requires the latest version of Adobe Flash, which can be downloaded without charge here [].

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Contact: Michael Woods
American Chemical Society

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