Plentiful fossils of dinosaur contemporary allow population study
Blacksburg, Va. Dinosaurs ruled the earth for hundreds of millions of years, then disappeared so completely that to find even a partially complete skeleton of a single multi-ton animal is rare. Meanwhile, the Virginia Museum of Natural History has scores of fossils of Tanytrachelos...New bulls may revive the Texas state Bison Herd
... genetic problems such as chromosomal defects were ruled out. But since Derr and Halbert already were sampling the DNA from the federal bison herds throughout the United States for another project, they knew how much genetic variation there should be in an "average" bison. "When we compared genetic varia...Wolves gone, western ecosystems suffer
...tors such as changing climate conditions have been ruled out as a possible cause. A modest recovery of willows may not seem that significant.But the OSU researchers say it has set the stage for ecological "spin-offs," including an increase in plant biomass, improved streambank stability, better...The giant eagle of Middle Earth
...the evolution of the extinct giant eagle that once ruled the skies in New Zealand. Before human settlement 700 years ago, New Zealand had no terrestrial mammals, apart from three species of bats. Instead, about 250 species of bird dominated the terrestrial ecosystem. At the top of the food chain was the...Ancient DNA helps solve the legend of giant eagles
...he extinct Haast's eagle, the giant bird that once ruled the skies over New Zealand. Weighing between 20 and 30 pounds, the enormous Haast's Eagle dominated its environment. It was 30 to 40 per cent heavier than the largest living bird of prey around today, the Harpy Eagle of Central and South America. Wo...Are IVF embryos starved of a vital ingredient?
...bility of long-term health effects still cannot be ruled out. There are certainly differences early on: singleton babies conceived by IVF or ICSI are more likely to have a low birthweight and to die soon after birth (New Scientist, 23 October 2004, p 10). Could these problems have something to do with the...Researchers find three major beetle groups coming up one testis short
...s evolved to have just one testis. The researchers ruled out obvious factors such as flight advantages or major changes in body form. They did notice that the monorchid beetles' accessory glands, which produce the bulk of the seminal fluid, were somewhat larger than normal. The researchers suggest that pa...New findings support a central role for NMDA receptors in learning and memory
...a specific time in an otherwise-normal adult brain ruled out such potentially confounding developmental effects. The acute requirement for NMDA receptors strengthens the case that they play a central molecular role in synaptic plasticity--potentially by virtue of their ability to act as coincidence detecto...Stegosaur plates and spikes for looks only, researchers say
...t "an accessory role in thermoregulation cannot be ruled out for the Stegosaurus plates. Being so large, well vascularized (and available) they may have been inevitably exapted for such a function. This is so even if the primary explanation of their occurrence in an evolutionary context may be elsewhere: n...Did humans cause ecosystem collapse in ancient Australia?
...instigators of the ecological changes? First, they ruled out the other usual suspect--global climate change. They looked at their data in 15,000-year intervals back to 140,000 years ago. The period included dramatic climate changes, but no changes in the diet and environment until an abrupt transition was ...DFG presents the 2005 MAK and BAT value lists
... if the MAK values are complied with but cannot be ruled out with sufficient certainty. Despite new studies...for substances, for which teratogenicity cannot be ruled out even if the MAK value is not exceeded. This year, a total of 16 working substances were examined...Circulating stem cells play small role in lung repair
...m an earlier pregnancy with a male fetus cannot be ruled out, Zander said. However, the association between the number of those cells found in the lung tissue with damage from rejection makes that unlikely. There was no sign of fusion between the bone marrow-derived cells and the donor pneumocytes, said Z...Birds that sing with their wings to woo
...t was initially skeptical of the "comb" idea. "We ruled out a lot of hypotheses" said Bostwick, "but when I realized that the wing feathers were twisted in a way that forced them to rub, I knew we had something." "The extensive modification of feathers in these unusual structures implies a high degree of ...Video analysis adds evidence for ivory-billed woodpecker
... upper range for ivory-bills. The size of the wing ruled out that the frames were of a pileated woodpecker, Rosenberg said. When one audience member asked about sightings of pileated woodpeckers with extra white on their wings, Rosenberg said that he and his colleagues were aware of molting pileated ...CU virologist finds contagious equine flu in dogs
...ounts of DNA or RNA in a blood or tissue sample -- ruled out avian flu strains H5 and H7. The isolate was ...ed positive for equine influenza virus. Donis also ruled out the possibility that the sample had been contaminated with equine virus from another source....New microscope allows scientists to track a functioning protein with atomic-level precision
...t does that mean all power stroke models have been ruled out and that all Brownian ratchet models are acceptable? No." Molecular folding The Block team also applied the new force clamp technology to one the hottest fields in biomedical research--molecular folding. For a protein to function properly, it h...Missing fossil link 'Dallasaurus' found
...nd dominated the oceans at the same time dinosaurs ruled the land. One aspect of Polcyn and Bell's research is the revelation that Dallasaurus retained complete limbs, hands and feet suitable for walking on land, whereas later mosasaurs evolved their limbs into flippers. "This is pretty close to the begin...Bird song changes sound alarm over habitat fragmentation
...song-sharing among non-neighbours declined. Having ruled out other explanations, such as the stage of the breeding season and competition intensity, the researchers say this change in song-sharing is due to lack of interaction between individuals isolated by habitat barriers. According to the study's autho...... around 65 species in Britain. UCL scientists have ruled out the common theory that attributed this richness of wildlife to climate change, in a paper published on 7th December by the journal Proceedings of the Royal Society B (Biological Sciences). Instead, scientists believe that biology played a far gr...... The US District Court in Harrisburg, Pennsylvania ruled that the York County (Pa.) school board violated the Constitution's principle to separate government and religion by requiring a four-paragraph statement to be read to high-school science students. The statement attacked evolution, the cornerstone of...