For the first time, scientists of the BaBar experiment at the Department of Energy's Stanford Linear Accelerator Center (SLAC) have observed the transition of one type of particle, the neutral D-meson, into its antimatter particle. This observation will now be used as a test of the Standard Model, the current theory that best describes all the universe's luminous matter and its associated forces.
Silicon Vertex Tracker.
Culture
Using a modified ink-jet printer, a McGill University researcher is producing three-dimensional bioceramic “bones” that could one day change the way reconstructive surgery is performed.
King Alfred burned the cakes, right? Wrong. For a start they were loaves – and for another thing, the Vikings reckon their terrifying-sounding hero Ragnar Hairybreeks should take the blame for this ninth century catering disaster.
University of Leeds professor Rory McTurk says the tale of Alfred and the cakes is probably the one story we all know about the Anglo-Saxon ruler, a detail as closely woven into popular history as Robert the Bruce being inspired by a spider and King Harold getting an arrow in the eye.
Why do some individuals sacrifice their own self-interest to help others? The evolution and maintenance of cooperative behavior is a classic puzzle in evolutionary biology. In some animal societies, cooperation occurs in close-knit family groups and kin selection explains apparently selfless behavior.
How do female chimps make sure they only get the best mates? By never wanting to reproduce at the same time, insuring that none of them have to settle for less.
At a depth of 2900 kilometres, the layer between the Earth's mantle and its core has always intrigued geophysicists because they are unable to explain the seismic data it generates. Researchers in the Solid State Structure and Properties Laboratory (CNRS/Université Lille 1/Lille National School for Advanced Chemistry) have studied its deformation which influences convection movements within the mantle or even those by tectonic plates.
Multiple sclerosis, diabetes, and arthritis are among a variety of autoimmune diseases that are aggravated when one type of white blood cell, called the immune regulatory cell, malfunctions. In humans, one cause of this malfunction is when a mutation in the FOXP3 gene disables the immune cells’ ability to function.
The fact that female wasp spiders have numerous sexual contacts is something which their male partners cannot prevent. What they can do, however, is ensure that no offspring ensue from these tête à têtes with their rivals: the male spiders simply place a chastity belt on their partner while copulating. The tip of their genital breaks off during intercourse, blocking the sexual orifice of the lady spider. Biologists from the universities of Bonn and Hamburg report on this amazing mechanism in the journal ‘Behavioral Ecology’ (vol. 18, pages 174-181, 2007).
Which navy commissioned the boat that sunk off the coast of Acre 200 years ago, which battles was it involved in and how did it end up at the bottom of the sea? The recent findings of marine archaeologists at the Leon Recanati Institute for Maritime Studies of the University of Haifa may provide the answers to these questions.
Carnegie Mellon University researchers say government officials need to adopt new ways of measuring and regulating the fine particles of smoke and soot so endemic to serious health problems and the global warming crisis.
In a March 2 article published in the journal Science, professors Allen L. Robinson and Neil M. Donahue report a new conceptual model for how microscopic particles behave in the atmosphere that raises new questions about current regulations.
Wood is formed from secondary xylem tissue consisting of cells with a heavily thickened secondary cell wall that is enriched in lignin and cellulose. In contrast, primary cell walls are composed mainly of polysaccharides (including cellulose), but contain very little lignin. Wood formation occurs through a complex series of steps involving cell division and expansion and the biosynthesis of lignin and cellulose. In addition, heartwood (darker wood at the center of the trunk) forms in many tree species through a highly regulated process of programmed cell death.
Archeologists from Yale and the University of Leicester have identified an ancient solar observatory at Chankillo, Peru as the oldest in the Americas with alignments covering the entire solar year, according to an article in the March 2 issue of Science.
The criminal justice system, often the subject of political controversy, gains major insights from the unbiased analytical tools that operations researchers introduced beginning with the President's Crime Commission in the 1960s, according to a career retrospective by the winner of the Stockholm Prize in Criminology.
A 17-year University of Utah study of ground movements shows that the power of the huge volcanic hotspot beneath Yellowstone National Park is much greater than previously thought during times when the giant volcano is slumbering.
Wyoming's Teton Range looms behind a Global Positioning System (GPS) antenna in Jackson Hole that was part of a 17-year University of Utah study in which GPS devices were used to measure gradual movements of Earth's crust in Grand Teton National Park, Yellowstone National Park and surrounding areas.
Scientists of the US CMS collaboration joined colleagues around the world in announcing today (February 28) that the heaviest piece of the Compact Muon Solenoid particle detector has begun the momentous journey into its experimental cavern 100 meters underground. A huge gantry crane is slowly lowering the CMS detector's preassembled central section into place in the Large Hadron Collider accelerator at CERN in Geneva, Switzerland.