Tag: "split" at biology news

No hobbits in this shire

...nt of anthropology, University of Kansas, composed split photographs of LB1's face, combining two left or two right sides as composite faces. The dissimilarities from the original face and between the two left or right composites were striking. To quantify these differences the researchers compared left ...

Loss of just one species makes big difference in freshwater ecosystem, study finds

... The researchers used a heavy, plastic divider to split a 210-meter stretch (a little more than a tenth of a mile) of Rio Las Maras in Venezuela into two separate river sections. On one side, they removed only Prochilodus, and on the other, all the fish remained. The team then took a series of measurement...

Scientists reverse evolution

...rn genes, we can reconstruct the ancient gene they split off from. It illuminates the mechanisms and proces...rs of modern vertebrate animals each Hox gene had split into four, so 13 became 52. Later, duplicate Hox genes either mutated in a way that proved useful, ...

Molecular DNA switch found to be the same for all life

...s ago, prior to when Archaea, Bacteria and Eukarya split into separate domains of life. "The ability of a cell to replicate its DNA in a timely and faithful manner is fundamental for survival, but, despite decades of study, the structural and molecular basis for initiating DNA replication, and the degr...

Ancient raindrops reveal the origins of California's Sierra Nevada range

...then, according to many scientists, California was split by an ancient subduction zone--a region of constant geologic upheaval, where a plunging oceanic tectonic plate continuously pushed the continental North American plate higher and higher to create the Sierra Nevada range. This version of events is i...

Early bird caught the fish: Fossils depict aquatic origins of birds 115 million years ago

... structurally modern birds called ornithuromorphs, split from the enantiornitheans (or "opposite birds"). Enantiornitheans were among the feathered fossils found in northeastern China during the 1990s. "The enantiornitheans had the best adaptations for perching, so they were able to dominate the ecolog...

Science researchers catch an early bird

...eserved." To find the fossils, the paleontologists split open countless slabs of mudstone from the lake "like turning the pages of a book," Lamanna says, noting that the repetitive process is "sort of like playing the lottery." You began work at the Changma site after finishing his doctorate at the Univers...

New research clarifies roles of calcium, vitamin D, and protein in bone health, fracture risk

...nto-Villareal's discovery were identified in women split into three groups: one that got calcium from supplements only; another that got it from food only; and a third that got calcium from both supplements and food. Dietary sources were associated with high levels of active estrogen metabolites in urine, ...

FSU research produces images of AIDS virus that may shape vaccine

...ed on top. But our images reveal that the stalk is split into three legs, spread more like a tripod, which increases their contact with the viral membrane," Roux said. "Seeing the tripod stalk suggests a novel mechanism by which HIV-1 is able to so effectively fuse with our cells. That essential knowledge ...

250,000 funding boost for research into eye disease

...fe Sciences. "Retinoschisis causes these layers to split resulting in blistering and in some cases parts of the retina can become detached. "At present there is no cure for the condition but if we can understand the molecular basis of the disease then we can look at the potential of new treatments." The th...

Even when faint, ovary scent draws sperm cells

...to a single chamber. Beyond the chamber, flows are split into three exit streams. Flow rate can be regulated simply by raising or lowering the height of the source medium, in this case a buffer solution. The researchers affixed a microscope and camera to the device and then recorded video of the sperm duri...

Human and chimp genomes reveal new twist on origin of species

The evolutionary split between human and chimpanzee is much more recent ... of Nature. The results show that the two species split no more than 6.3 million years ago and probably less than 5.4 million years ago. Moreover, the speci...

No-mow grass may be coming to your yard soon

... of steroids as hormones preceded the plant-animal split over a billion years ago," Chory explained. In animals, the route steroid hormones use to exert their influence in the nucleus of a cell, where gene expression is regulated, is direct, through the use of nuclear receptors. Plants, said Chory, don't ...

New bridges for the next generation

... begin in fall 2006 and the two organisations will split costs fifty-fifty. The first three years will be a trial phase; after that, the institutions will decide whether it should continue. In order to prepare and execute the new programme, the Max Planck Society is holding marketing, consulting, and infor...

Keeping amyloid - and Alzheimer's - in check

...lled amyloid precursor protein (APP) is cleaved or split in a series of events. A protein complex called th...n cleavage in which selected membrane proteins are split in a region that crosses cell membranes. This previously unrecognized form of protein cleavage is e...

Eight Stanford scholars elected to the American Academy of Arts and Sciences

...also proposed with Nima Arkani-Hamed the theory of split supersymmetry, which, if confirmed, would lend support to the idea that our universe and its laws are not unique and that there is an enormous variety of universes, each with its own distinct physical laws. A member of the Stanford Physics Department...

Researchers solve mystery of how nuclear pores duplicate before cell division

...ell's nucleus double in number to prepare for the split to come when a cell divides. Now, for the first ti...ed with a fluorescent tag. If the nuclear pore had split to give rise to two daughter pores, two bright dots would have emerged from one; however, the resear...

Hominid fossils from Ethiopia link ape-men to more distant human ancestors

... years of evolution - from the first hominids that split from chimpanzees to modern humans, Homo sapiens sapiens. The team continues to unearth fossils from what White describes as "the world's best window on human evolution."...

Studies confirm celecoxib may help prevent colorectal cancer in high risk patients

...f potential cardiovascular events." Patients were split into a 3:2 ratio of celecoxib and placebo and divided by baseline aspirin use (17 percent, placebo; 16.6 percent celecoxib) or non-use (83 percent placebo; 83.4 percent celecoxib); 933 patients received celecoxib and 628 received placebo. Of the tot...

Frogs ear canal may provide insights for understanding human hearing loss

...can hear ultrasounds. They recorded a male's call, split it into the audible components and ultrasonic comp...esponses of eight A. tormotus males to each of the split sounds. Five of the eight frogs produced calls in response to the audible, ultrasonic or both compon...

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