Using a tool kit of lasers, tiny beads and a Lego set, Howard Hughes Medical Institute researchers have made the first measurement of the torsional, or twisting, elasticity of a single molecule of DNA.
The measurements reveal that DNA is significantly stiffer than previously thought and, when wound, may in fact provide enough power to be used as a sort of molecular, rubberband motor to propel nanomachines. Although that type of application may be well in the future, the studies are significant because they offer a blueprint for measuring the contortions that DNA undergoes during replication and other key processes.
The researchers, led by Howard Hughes Medical Institute investigator Carlos Bustamante, reported their research in the July 17, 2003, issue of the journal Nature. Bustamante and the papers two lead authors, graduate students Zev Bryant and Michael Stone, are at the University of California, Berkeley.
Jim Keeley | Howard Hughes Medical Institute
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Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
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An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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