Life can be scary for endangered loggerhead sea turtles immediately after they hatch. After climbing out of their underground nest, the baby turtles must quickly traverse a variety of terrains for several hundred feet to reach the ocean.
Earth
MADISON, WI, FEBRUARY 22, 2010 — Combined mechanisms of transport have important applications—transport of nutrients across cell membranes in plants and animals, the aeration of agricultural soils, performance of chemical reactors, the design of membranes for desalting brackish water, and the design of clay membranes for retaining dangerous chemicals. Because mass transport of fluid constituents has important roles in biology, physics, and chemistry, one would assume that such transport would be well understood by the scientific community.
Subatomic particles called neutrons are poised to play a big role in fighting HIV, slowing global warming, and improving manufacturing processes. The reason: They are the focus of a process called neutron scattering that provides unprecedented ways to study the chemistry of a wide range of important materials, including coal and biological cells, according to a fascinating article in Chemical & Engineering News (C&EN), ACS' weekly newsmagazine.
IUPAC accepted the name proposed by the international discovering team around Sigurd Hofmann at the GSI Helmholtzzentrum. The team had suggested "Cp" as the chemical symbol for the new element. However, since the chemical symbol "Cp" gave cause for concerns, as this abbreviation also has other scientific meanings, the discoverers and IUPAC agreed to change the symbol to "Cn". Copernicium is 277 times heavier than hydrogen, making it the heaviest element officially recognized by IUPAC.
Using large-scale supercomputer calculations, researchers have analyzed how the placement of metallic contacts on graphene changes the electron transport properties of the material as a factor of junction length, width and orientation. The work is believed to be the first quantitative study of electron transport through metal-graphene junctions to examine earlier models in significant detail.
In a paper appearing in the Feb. 24 issue of the Proceedings of the Royal Society of London A, Virginia Tech Engineering Science and Mechanics Professor Hassan Aref, and his colleague Johan Roenby at the Technical University of Denmark shed new light on the chaotic motion of a solid body moving through a fluid. They claim to have discovered two basic mechanisms that lead to chaotic motion of the body as it interacts with its vortex wake. The work may lead to better understanding and control of real body-vortex interactions.
To help assess the potential threat of more large earthquakes in Haiti and nearby areas, scientists at The University of Texas at Austin's Institute for Geophysics are co-leading three expeditions to the country with colleagues from Purdue University, Lamont-Doherty Earth Observatory, the U.S. Geological Survey and five other institutions.
PROVIDENCE, R.I. [Brown University] — At the quantum level, the forces of magnetism and superconductivity exist in an uneasy relationship. Superconducting materials repel a magnetic field, so to create a superconducting current, the magnetic forces must be strong enough to overcome the natural repulsion and penetrate the body of the superconductor. But there's a limit: Apply too much magnetic force, and the superconductor's capability is destroyed.
Johns Hopkins researchers have discovered that, under the right conditions, newly developed nanocrystalline materials exhibit surprising activity in the tiny spaces between the geometric clusters of atoms called nanocrystals from which they are made.
Lying beneath the ocean is spectacular terrain ranging from endless chains of mountains and isolated peaks to fiery volcanoes and black smokers exploding with magma and other minerals from below Earth's surface. This mountainous landscape, some of which surpasses Mt. Everest heights and the marine life it supports, is the spotlight of a special edition of the research journal Oceanography.
A five-person team sent to evaluate damage from the devastating magnitude-7 earthquake that struck Haiti on Jan. 12 found no surface evidence of the fault that might have caused the quake, but installed four instruments to measure aftershocks and help pinpoint the epicenter.
University of Washington civil and environmental engineering professor Marc Eberhard led the team that provided engineering support to the United States Southern Command, responsible for all U.S. military activities in South and Central America.
SALT LAKE CITY, Feb. 22, 2010 – University of Utah scientists developed an easier way for meteorologists to predict snowfall amounts and density – fluffy powder or wet cement. The method has been adopted by the National Weather Service for use throughout Utah – and could be adjusted for use anywhere.
(San Diego, Calif.) –– Marine reserves are known to be effective conservation tools when they are placed and designed properly. This week, a special issue of the Proceedings of the National Academy of Sciences (PNAS) is dedicated to the latest science on marine reserves, with a focus on where and how reserves can most effectively help to meet both conservation and fisheries goals.
Researchers who devised the largest earthquake preparedness event ever undertaken in the United States say one of the biggest challenges was translating devastation projections from a hypothetical magnitude 7.8 San Andreas Fault temblor into timely, usable information to the more than 5 million California participants in 2008.
The impact of global warming on food prices and hunger could be large over the next 20 years, according to a new Stanford University study. Researchers say that higher temperatures could significantly reduce yields of wheat, rice and maize – dietary staples for tens of millions of poor people who subsist on less than $1 a day. The resulting crop shortages would likely cause food prices to rise and drive many into poverty.
But even as some people are hurt, others would be helped out of poverty, says Stanford agricultural scientist David Lobell.