Featured Research

from universities, journals, and other organizations

'Sticky' DNA Crystals Promise New Way To Process Information

Date:
February 7, 2003
Source:
University Of Minnesota
Summary:
Imagine information stored on something only a hundredth the size of the next generation computer chip--and made from nature's own storage molecule, DNA. A team led by Richard Kiehl, a professor of electrical engineering at the University of Minnesota, has used the selective "stickiness" of DNA to construct a scaffolding for closely spaced nanoparticles that could exchange information on a scale of only 10 angstroms (an angstrom is one 10-billionth of a meter).

MINNEAPOLIS / ST. PAUL -- Imagine information stored on something only a hundredth the size of the next generation computer chip--and made from nature's own storage molecule, DNA. A team led by Richard Kiehl, a professor of electrical engineering at the University of Minnesota, has used the selective "stickiness" of DNA to construct a scaffolding for closely spaced nanoparticles that could exchange information on a scale of only 10 angstroms (an angstrom is one 10-billionth of a meter). The technique allows the assembly of components on a much smaller scale and with much greater precision than is possible with current manufacturing methods, Kiehl said. The work is published in a recent issue of the Journal of Nanoparticle Research.

"In a standard silicon-based chip, information processing is limited by the distance between units that store and share information," said Kiehl. "With these DNA crystals, we can lay out devices closely so that the interconnects are very short. If nanoparticles are spaced even 20 angstroms apart on such a DNA crystal scaffolding, a chip could hold 10 trillion bits per square centimeter--that's 100 times as much information as in the 64 Gigabit D-RAM memory projected for 2010. By showing how to assemble nanoscale components in periodic arrangements, we've taken the first step toward this goal."

Eventually, a chip made from DNA crystals and nanoparticles could be valuable in such applications as real-time image processing, Kiehl said. Nanocomponents could be clustered in pixel-like "cells" that would process information internally and also by "talking" to other cells. The result could be improved noise filtering and detection of edges or motion. Someday, the technology may even help computers identify images with something approaching the speed of the human eye and brain, said Kiehl.

The team devised a DNA scaffolding for arrays of nanoparticles of gold, but the scaffolding could also hold arrays of carbon nanotubes or other molecules. Information could be stored as an electrical charge on certain nanoparticles; the presence or absence of charge would constitute one bit of information. Alternatively, nanoparticles could be magnetic, and the magnetic states would be read as information. Because DNA strands contain four chemical bases spaced every 3.4 angstroms, information might be stored on that small a scale, Kiehl said.

To manufacture the scaffolding, the researchers took advantage of the fact that each base spontaneously pairs up with, or "sticks to," one of the other bases to form the famous DNA double helix. The team synthesized four different two-dimensional "tiles" of DNA, each tile having an extension that sticks to the extension on another tile. Like self-assembling jigsaw pieces, the tiles joined themselves into a flat crystal with a repeating pattern. One tile had a stretch of DNA that extended above the plane of the tile; to this the researchers anchored a spherical, 55-atom nanoparticle of gold. Under an electron microscope, the gold nanoparticles appeared as regular lines of bright spots. A regular pattern of nanoparticles is important in arranging them to process or store information.

"Gold is a metal, and a matrix between metals and organic molecules like DNA is very hard to make," Kiehl said. "If we can make DNA scaffolding for gold, we think we can do it for carbon nanotubes and other organic molecules. The technique is well suited to laying out locally interconnected circuitry, which is of great interest for circumventing the interconnect bottleneck-- the well-known problem where wires, rather than devices (transistors), limit computing speed."

Other scientists have used DNA as nanoparticle "glue," but such arrangements are prone to structural flaws, which limits their usefulness, said Kiehl. In contrast, the virtually perfect arrangement of molecules within a DNA crystal allows precise control over the arrangement of the particles.

Among the next steps for the researchers is to demonstrate that nanoparticles bound to the DNA crystals can function electrically.

"We're working on instrumentation to do electrical characterization of gold nanoparticles and other nanocomponents on DNA," said Kiehl. "We hope to show, for example, that DNA doesn't interfere with the electrical functioning of the nanocomponents."

The work was supported by the National Science Foundation.


Story Source:

The above story is based on materials provided by University Of Minnesota. Note: Materials may be edited for content and length.


Cite This Page:

University Of Minnesota. "'Sticky' DNA Crystals Promise New Way To Process Information." ScienceDaily. ScienceDaily, 7 February 2003. <www.sciencedaily.com/releases/2003/02/030207070412.htm>.
University Of Minnesota. (2003, February 7). 'Sticky' DNA Crystals Promise New Way To Process Information. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2003/02/030207070412.htm
University Of Minnesota. "'Sticky' DNA Crystals Promise New Way To Process Information." ScienceDaily. www.sciencedaily.com/releases/2003/02/030207070412.htm (accessed October 22, 2014).

Share This



More Matter & Energy News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) — Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) — Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) — As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com
What Is Magic Leap, And Why Is It Worth $500M?

What Is Magic Leap, And Why Is It Worth $500M?

Newsy (Oct. 22, 2014) — Magic Leap isn't publicizing much more than a description of its product, but it’s been enough for Google and others to invest more than $500M. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins