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Could yield biosensors with greater sensitivity, specificity
Scientists at Hebrew University, Israel, in collaboration with researchers at the U.S. Department of Energy’s Brookhaven National Laboratory, have devised a way to use gold nanoparticles as tiny electrical wires to plug enzymes into electrodes. The gold “nanoplugs” help align the molecules for optimal binding and provide a conductive pathway for the flow of electrons. The research, described in the March 21, 2003, issue of
Cell phones, CD players and flashlights all wear down batteries far faster than we might wish. But there’s new hope, now that researchers at the Department of Energy’s Idaho National Engineering and Environmental Laboratory (INEEL) have overcome another barrier to building more powerful, longer-lasting lithium-based batteries.
The INEEL team, led by inorganic chemist Thomas Luther, discovered how lithium ions move through the flexible membrane that powers their patented rechargeab
A team of investigators at Carnegie Mellon University has formed the first hybrid quadruplex of peptide nucleic acids, or PNAs, with DNA, the genetic code. This result opens new opportunities to study the activity of genetic regions occupied by recently described quadruplex DNA structures, as well as providing a new compound that could be used as a biosensor or to block gene activity associated with diseases such as cancer. The research results, published online, will appear in a forthcoming issue o
An international team of marine geologists has just completed an expedition to an area off the coast of Surinam known as the Demerara Rise. The scientists were part of the two-month Leg 207 of the NSF-supported Ocean Drilling Program (ODP) expedition in the equatorial Atlantic Ocean. The project studied periods in Earth’s history that have undergone rapid climate and ocean circulation changes and likely led to mass extinctions of plants and animals.
Three decades ago, geologists found s
Observations with the Very Large Telescope Interferometer (VLTI) at the ESO Paranal Observatory (Chile) have provided the first-ever direct determination of the angular sizes of the disks of the solar-type stars Alpha Centauri A and Alpha Centauri B. As the two largest members of this triple stellar system that also includes the much smaller Proxima Centauri, they are the Sun’s nearest neighbours in space at a distance of just over 4 light-years. Together with photometric and asteroseismic observati
Lightning may be Mother Nature’s greatest show on Earth, but scientists now know it can produce significant amounts of ozone and other gases that affect air chemistry.
Researcher Renyi Zhang of Texas A&M University helped lead a study on the impact of lightning, and the results are surprising: Lightning can be responsible for as much as 90 percent of the nitrogen oxides in the summer and at the same time increase ozone levels as much as 30 percent in the free troposphere, the area that