Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > News > Identifying bacteria with gold-nanoparticle constructs

March 27th, 2008

Identifying bacteria with gold-nanoparticle constructs

Abstract:
Bacteria cause millions to suffer from a variety of infections every year. Current methods of identifying bacteria require expensive equipment or a great deal of time—the most common method for identifying bacteria, plating and culturing, requires at least 24 hours. A quicker method of identifying harmful bacteria would be beneficial to many fields, including medical diagnosis and food inspection.

Chemists have devised a sensor array to identify bacteria by fluorescence. The general design involves associating a negatively charged conjugated polymer with positively charged chemicals on the surface of a gold nanoparticle. The negatively charged conjugated polymer is fluorescent on its own but, when it's associated with the nanoparticle, the fluorescence is quenched. Bacteria, which have negatively charged surfaces, can dissociate the conjugated polymer. Once the conjugated polymer has been freed, the fluorescence is restored. Different bacteria species may or may not trigger this reaction depending on the type of chemicals used on the surface of the gold nanoparticle.

Source:
arstechnica.com

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Scientists discover new 'boat' form of promising semiconductor: GeSe Uncommon form attenuates semiconductor's band gap size March 23rd, 2017

Caught on camera -- chemical reactions 'filmed' at the single-molecule level March 22nd, 2017

Rare-earths become water-repellent only as they age March 22nd, 2017

Nanomedicine

Nanoparticle paves the way for new triple negative breast cancer drug March 20th, 2017

Block copolymer micellization as a protection strategy for DNA origami March 17th, 2017

Nanocages for gold particles: what is happening inside? March 16th, 2017

Biophysicists propose new approach for membrane protein crystallization March 8th, 2017

Discoveries

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Scientists discover new 'boat' form of promising semiconductor: GeSe Uncommon form attenuates semiconductor's band gap size March 23rd, 2017

Caught on camera -- chemical reactions 'filmed' at the single-molecule level March 22nd, 2017

Rare-earths become water-repellent only as they age March 22nd, 2017

Announcements

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Scientists discover new 'boat' form of promising semiconductor: GeSe Uncommon form attenuates semiconductor's band gap size March 23rd, 2017

Caught on camera -- chemical reactions 'filmed' at the single-molecule level March 22nd, 2017

Rare-earths become water-repellent only as they age March 22nd, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project