No longer just for biology, RNA can now be built into 3-D arrays
...own as pRNA, or packaging RNA, that forms six-unit rings that can drive a tiny but powerful molecular motor." Peixuan Guo "Our future research will focus on incorporating these nanomachines into nanodevices for such applications as drug or gene delivery, gears for nano-equipment, and intricate arrays and ...Researchers show how to assemble building blocks for nanotechnology
...ith optical and mechanical properties. The chains, rings and twisted and staircase assemblies could serve as basic structural units to further prepare materials with more complex structures such as tubes, helices and 3-D networks that could in turn, serve as scaffolds or templates for assembly of electroni...Growing pains: T. Rex was teenage giant
...growth. The scientists did this by counting growth rings in the bones of T. rex and other members of its fa...d their results by comparing the dinosaurs' growth rings to those of modern-day alligators and lizards, whose rings are similar. Ten years ago such...Measuring blood sugar with a wave of the arm
...plains. "If you hit a bell with a hammer, the bell rings at a characteristic frequency. If you coat the bell with a layer of paint, the frequency changes." Likewise, the molecules in a magnetoelastic sensor vibrate in the presence of a magnetic field, and the frequency varies with different chemical coatin...Bay area to get unique x-ray microscopy resource
...vices composed of nanometer-scale concentric metal rings that are used to focus x-rays for imaging purposes. "Whereas XM-1 could only be used to study suspension cell lines, XM-2 can be used to study adherent cell lines as well," says Larabell. "In addition, we'll have greater energy tunability with XM-2...Paleofire database puts fire-scar and charcoal data online
Prehistoric fire records developed from tree rings and from charcoal in lake sediments are available for free for the first time. All it takes is an Internet connection. The International Multiproxy Paleofire Database (IMPD) is a cooperative effort between those who reconstruct proxy records of past ...Insights gained from molecular modeling may lead to better insecticides
...sites. In the black swallowtails version, aromatic rings protrude into the substrate binding site, creatin...uct. In the earworm protein, many of the aromatic rings are missing, creating a much more accessible and flexible catalytic site. As a result, toxins of man...Duke open-air experiment results could deflate hopes that forests can alleviate global warming
...CE site mounted pipes and valves on three separate rings of towers to release extra gas onto the forested t...wind or weather conditions. Three additional tower rings surround similar test plots but emit no gas, thus serving as experimental "controls." Scientists mea...Simple sugars make cell walls like steel
...siology. "A plant cell is essentially concentric rings or spools of cellulose, so when the cells expand, ...g growth are continually integrated from the inner rings into the outer rings. "This process prevents the thickness of the wall from changing even as the ...Endurance of plants under quartz rocks possible model for life on early Earth, Mars
...es. Quartz pebbles thicker than one inch still had rings of plant life around those parts of their bottom edges where sunlight could penetrate through the stone at an oblique angle. By placing heat sensors above and below some of the pebbles in all four seasons, the scientists documented that living under ...With nature's help, a better vision system for smart weapons
...modified the zone plate, replacing the transparent rings with a series of precisely spaced holes that sharpen the focus quality of the beam. Although similar devices, called photon sieves, had been developed before, they are typically used for X-rays or other electromagnetic radiation outside the visible l...JCI Table of Contents, November 3, 2003
... cells forms elastic fibers arranged in concentric rings of elastic lamellae around blood vessel lumen. The elastic lamellae allow the vessel to expand and contract with the stress of blood flow and maintain sufficient blood pressure during diastole (filling) and systole (contraction) phases of the heart b...Rising ozone levels pose challenge to U.S. soybean production, scientists say
.../or ozone from 50-ton solar-powered tanks. Control rings also surround equal amounts of non-altered crops, which grow in normal conditions, without gases, for comparison purposes. Construction began in 2000; research began the next spring. SoyFACE comprises more than 30 research groups with participants fr...Increasing carbon dioxide relieves drought stress in corn, researchers say
...or ozone from 50-ton solar-powered tanks. Control rings surround equal amounts of control crops, which grow in normal conditions, without gases, for comparison purposes. Construction began in 2000; research began the next spring. SoyFACE comprises more than 30 research groups with participants from 18 cou...Protein mimetics could lead to more successful coronary bypasses
...hy and colleagues measured the contraction of thin rings of smooth muscle from the coronary arteries of pig...n the signal pathway. The HSP20 mimetic caused the rings of muscle to relax in a dose-dependent fashion, as did papaverine. The scrambled mimetic did not cau...Army ants have defied evolution for 100 million years
...ok that family tree and looked at its genetic tree rings to postulate what happened in the past," he said. Brady combined the genetic data with the army ant fossil information and the ants' morphological (form and structure) information to establish ages for the different ant species. Combining this data, ...[Mis]understanding village abandonments
... of Science (AAAS) Annual Meeting. Clues from tree rings and household objects like remnants of pottery gave researchers insight to determine that the disappearance of the inhabitants in the late 13th century was not due to failure at village life or an inability to grow. Native people moved often to susta...Opening the black box: Scientists gain new tools to learn about the near-shore environment
...is like a pearl that begins before birth with tiny rings that reflect the composition of the water for each day of the life of the animal. With further study, scientists will be able to use these markers like internal flight recorders to follow the movements of the marine animal. Another important tool is...Science picks -- leads, feeds and story seeds (February 2003)
...Tree Rings Track Tremors Through Time Using tree rings as a forensic tool, USGS scientists are gathering clues about landslides caused by earthquakes and other seismic events. The tree-ring records of 32 tilted and damaged conifers at three sites of landslides in southwestern Montana were examined and s...... 1000-feet in diameter and up to 16 feet deep, the rings are found in soft fine-grained clay found in the d...s below Lake Superior's rings, thinking that these rings could be immature PFS. "We think the rings are the surface expression of this developing fault syst...