Tag: "proposed" at biology news

Caribbean frogs started with a single, ancient voyage on a raft from South America

...quencing and analysis. One prominent theory had proposed that frog species on the large islands of Cuba, Ja...70-to-80-million years ago. A second major theory proposed that they arrived, instead, by rafting across the Caribbean Sea after the giant asteroid impact near...

Columbine flowers develop long nectar spurs in response to pollinators

...week's issue of the journal Nature. Darwin once proposed a co-evolutionary "race" to explain how natural selection might account for the evolution of very long nectar spurs in flowers, said Hodges. "In Darwin's race, plants with the longest spurs and pollinators with the longest tongues [to tap the flowers...

Massive herds of animals found to still exist in Southern Sudan

... habitat supporting several species, which will be proposed as a new protected area. (OVER) In an effort to protect this newly discovered natural resource, WCS has signed cooperation agreements with both GoSS and its Ministry of Environment, Wildlife Conservation, and Tourism to launch a conservation st...

Prey not hard-wired to fear predators

...ion. The states of Wyoming and Idaho have already proposed plans that would allow for as much as 85 percent of these once-protected wolves to be killed. So even as the goal of re-instilling fear of predators in prey species has been successful, the question remains whether enough wolves will be left to main...

Eavesdropping comes naturally to young song sparrows

... not change. Beecher and his colleagues earlier proposed that eavesdropping and interactive singing are critical in song learning. However, they could not determine if the young birds learned more by direct interaction with a tutor or by eavesdropping. To answer that question, the researchers collected...

Scripps research team sheds light on long-sought cold sensation gene

...M8 was first discovered by Patapoutian’s group and proposed as a key gene controlling cold sensation. To test the hypothesis, the group observed the behavior of mice genetically altered to lack the gene in response to cold stimuli. When placed in compartments with a temperature gradient, or in an enclosur...

Legal ruling may put endangered species in danger

...ecessary for the viability of a species." "The proposed rule would have allowed our national symbol, the bald eagle, to become extinct in the lower 48 states, surviving only in Alaska, and it would have allowed the gray whale to become extinct in U.S. waters," Vucetich went on to say. Vucetich and Mich...

Baumann Lab defines proteins that distinguish chromosome ends from DNA double-strand breaks

... complexes and structures have been identified and proposed to protect chromosome ends, but conclusive evidence that any of these are required for protection has been lacking. "We set out to define the minimal requirements that would allow the DNA repair machinery to distinguish a chromosome end from a br...

DOE JGI sets 'gold standard' for metagenomic data analysis

...rmation embedded in that sequence. The solution proposed by Mavrommatis and his colleagues was to evaluate ...ed the sequence. Several more methods have been proposed for binning, but none of these on their own have proven satisfactory, Mavrommatis said. "What we pr...

Study warns deep-sea mining may pose serious threat to fragile marine ecosystems

...ronment beyond its boundaries. While studies of proposed undersea manganese mining in the equatorial region...en no independent impact assessment studies of the proposed massive sulphide mining sites. "Over 250 active and fossil deposits have already been found. And the...

New study sheds light on 'dark states' in DNA

... how we view DNA photostability." Until now, the proposed dark energy state of DNA was a little like the dark matter in the universe ?there was no direct way of probing it. The Ohio State chemists used a technique called transient absorption, which is based on the idea that molecules absorb light at specifi...

Scientists find potential 'off-switch' for HIV virus

...eir work and previous studies by others, they have proposed that the Tat protein and the enzymes that modify it serve as a "resistor," a component of an electrical circuit that reduces the flow of current. "The resistor paradigm is a helpful way to think about how HIV enters and exits latency, and it migh...

Is there a pilot in the insect?

... flow regulator. The very simple control scheme proposed takes into account 70 years of often surprising observations of the behavior of winged insects. It accounts for the fact not only that insects descend facing a headwind and ascend with a tailwind, but also that honeybees land with a constant slope an...

New biofuels process promises to meet all US transportation needs

Purdue University chemical engineers have proposed a new environmentally friendly process for produci... dioxide, the process would eliminate the need for proposed carbon dioxide "sequestering." Sequestering would involve pumping carbon dioxide emissions into s...

FSU researchers determine a critical factor in workings of proteins

...calculation of association rates between proteins, proposed by Zhou and coworkers, really works."...

Natural gut hormone offers hope for new obesity drug

...s to make it more practical." If successful, the proposed research may lead to a treatment within five to ei...s currently a lack of effective treatments and our proposed drug is based on a natural way of controlling the body's appetite, which makes it more attractive." ...

Racing neurons control whether we stop or go

...a target, in response to a signal. "Our race model proposed that two independent processes were underway, one telling us to ‘go?and one telling us to ‘stop?in response to the stop signal. "Applying the model to children’s behavior revealed that stop signal task times are significantly longer in children w...

Einstein's tea leaves inspire new blood separation technique

...ed inward near the bottom of the chamber. Einstein proposed an explanation to this phenomenon in 1926 when he noticed that tea leaves collected at the center of the bottom of a stirred teacup instead of being expelled outward. The tiny chamber of blood, like the teacup, is a cylinder of liquid that is rotat...

Stem cells decrease ischemic injury and restore brain function

...ins De Simoni. "Therefore, it is not necessary, as proposed in past studies, for stem cells to turn into neurons in order to protect the brain from ischemic injury and restore brain functions. Their presence in brain tissue is sufficient to induce a protective reaction." Various cells are involved in this ...

The connector rotation hypothesis? Phage do not pack their DNA by rotation

...that their findings are compatible with a recently proposed nonrotating model in which the ring of ATPases alternately compresses and extends, drawing in the DNA. But further testing will be needed to confirm the validity of that model to the degree of certainty with which this team rejected the rotator hypot...

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