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Biologists unravel part of the mystery behind disappearance of shell material
Chitin, the Earth’s second-most abundant biological material, is a major component in the flurry of skeletal debris discarded daily by crustacean creatures in the world’s oceans. If left undisturbed, this tough insoluble material, a cousin to cellulose, would pile up on the ocean’s floor and wreak havoc with marine ecosystems. Fortunately, armies of bacteria act as chitin’s cleanup crew,
Studies of the unique landscape in the Dry Valleys of Antarctica provide new insights into the origin of similar features on Mars and provide one line of evidence that suggests the Red Planet has recently experienced an ice age, according to a paper in this week’s issue of the journal Nature.
The distribution of hexagonal mounds and other features on the Martian surface at mid-latitudes similar to those in the Dry Valleys also supports previous scientific assertions that a significant amou
Nearly 99 percent alike in genetic makeup, chimpanzees and humans might be even more similar were it not for what researchers call “lifestyle” changes in the 6 million years that separate us from a common ancestor. Specifically, two key differences are how humans and chimps perceive smells and what we eat.
A massive gene-comparison project involving two Cornell University scientists, and reported in the latest issue of the journal Science (Dec. 12, 2003), found these and many other differen
New findings may have implications for the stability of today’s climate
Scientists at the University of California, Riverside and Columbia University have found evidence of the release of an enormous quantity of methane gas as ice sheets melted at the end of a global ice age about 600 million years ago, possibly altering the ocean’s chemistry, influencing oxygen levels in the ocean and atmosphere, and enhancing climate warming because methane is a powerful greenhouse gas. Th
Of all the personal computers to be unwrapped during the holiday season, more than 80 percent will be used to go online and search the Web’s more than 92 million gigabytes of data (comparable to a 2 billion-volume encyclopedia). Getting online is the easy part, finding a useful Web page is a bit harder-keeping track of a useful Web page is another issue altogether.
People have devised many tricks-such as sending e- mails to themselves or jotting on sticky notes-for keeping track of Web pa
Duke University Medical Center researchers have identified the second of three genes that can each independently cause the disorder known as cerebral cavernous malformations (CCM), which is characterized by mulberry-like clusters of blood vessels in the brain. The finding paves the way for a new genetic test for the rare, familial disease, which typically lies dormant in patients for decades before its potentially devastating symptoms appear, said the researchers.
The vessel lesions in the