 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
LEDs used to produced plant antioxidants
Beltsville, Md. (UPI) May 21, 2009 U.S. scientists say they are experimenting with ultraviolet light-emitting diodes to create darker, redder lettuce that is rich in antioxidants Plant physiologists led by Steve Britz of the U.S. Department of Agriculture in Beltsville, Md., said spinach has more nutritional value than iceberg lettuce because darker colors in leafy vegetables are often signs of antioxidants that are thought to have a variety of health benefits. The researchers said the dark red tinges on a leaf of red leaf lettuce are created when the sun's ultraviolet rays strike the plant and the plant creates UV-absorbing polyphenolic compounds to help block the ultraviolet radiation that can mutate plant DNA. To create red leaf lettuce plants enriched with such compounds, Britz purchased low-power LEDs that shine with UVB light, a component of natural sunlight. Britz said he exposed the plants to approximately 10 milliwatts of UVB light per square meter. After 43 hours of exposure the growing lettuce plants were noticeably redder than other plants that only saw white light. "We've been pleasantly surprised to see how effective the LEDs are, and are now testing how much exposure is required, and whether the light should be pulsed or continuous," said Britz. The scientists will present their research June 2 in Baltimore during the Lasers and Electro Optics/International Quantum Electronics Conference. Share This Article With Planet Earth
Related Links Farming Today - Suppliers and Technology
Rubber plantations could have 'devastating' impact in AsiaChicago (AFP) May 21, 2009 The expansion of rubber plantations in southeast Asia could have a "devastating" environmental impact, scientists warned Thursday as they pressed for a substantial increase in forest preserves. More than 500,000 hectares (1.2 million acres) may have already been converted to rubber plantations in the uplands of China, Thailand, Vietnam, Laos, Cambodia and Myanmar. And researchers predict ... read more |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2009 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
del.icio.us
Digg
Reddit
YahooMyWeb
Google
Facebook