Detecting the presence of hazardous lead paint could become as simple as pressing a piece of paper against a wall and noting a color change.
Scientists at the University of Illinois at Urbana-Champaign have developed a highly sensitive and selective biosensor that functions in much the same fashion as a strip of litmus paper. The researchers report their discovery in a paper that has been accepted for publication in the Journal of the American Chemical Society, and posted on its Web site. The colorimetric sensor is based upon DNA-gold nanoparticle chemistry, and could be used for sensing a variety of environmental contaminants.
Using gold nanoparticles laced with DNA, Illinois chemistry professor Yi Lu and graduate student Juewen Liu are able to hybridize the nanoparticles into aggregate clusters that have a characteristic blue color. In the presence of a specific metal ion, the catalytic DNA will break off individual gold nanoparticles, resulting in a dramatic color shift to red. The intensity of the color depends upon the initial concentration of contaminant metal ions.
James E. Kloeppel | EurekAlert!
Dissolving protein traffic jam at the entrance of mitochondria
23.05.2019 | Albert-Ludwigs-Universität Freiburg im Breisgau
Producing tissue and organs through lithography
23.05.2019 | Goethe-Universität Frankfurt am Main
Physicists at the University of Basel are able to show for the first time how a single electron looks in an artificial atom. A newly developed method enables them to show the probability of an electron being present in a space. This allows improved control of electron spins, which could serve as the smallest information unit in a future quantum computer. The experiments were published in Physical Review Letters and the related theory in Physical Review B.
The spin of an electron is a promising candidate for use as the smallest information unit (qubit) of a quantum computer. Controlling and switching this spin or...
Engineers at the University of Tokyo continually pioneer new ways to improve battery technology. Professor Atsuo Yamada and his team recently developed a...
With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists...
'Quantum technologies' utilise the unique phenomena of quantum superposition and entanglement to encode and process information, with potentially profound benefits to a wide range of information technologies from communications to sensing and computing.
However a major challenge in developing these technologies is that the quantum phenomena are very fragile, and only a handful of physical systems have been...
Working group led by physicist Professor Ulrich Nowak at the University of Konstanz, in collaboration with a team of physicists from Johannes Gutenberg University Mainz, demonstrates how skyrmions can be used for the computer concepts of the future
When it comes to performing a calculation destined to arrive at an exact result, humans are hopelessly inferior to the computer. In other areas, humans are...
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