Tag: "frog" at biology news
European common frog found to use novel mating strategy
...eager males to available females. For every female frog
there were between four and 10 male frogs in a pon...mpregnate a female. And unlike the females of some frog
species, the common frog
will not lay eggs if clasped by two males. Since as many as one-third of th...
Viral suspect for amphibian decline traced to human spread through bait
...ed to another iridovirus strain that is endemic in frog
populations. But preliminary analysis by the team has found that the salamander-killing virus is even closer to a virus found in sport fish (including rainbow trout), which in turn the researchers suspect resulted when the virus jumped from frogs to ...
Excess levels of nitrogen, phosphorus linked to deformed frogs
...ed limbs to the presence of Ribeiroia ondatrae, a frog
parasite that has been noted in the scientific lit...s increased to upwards of 20 to 30 percent of some frog
populations in the 21st century compared with probably less than one percent historically. ...
NRH1 and Wnt signaling come together in convergent extension
...in the regulation of CE movements in both fish and frog
through the activity of downstream small GTPases. This protein family, which includes Rho, Rac and Cdc42, interacts with the cytoskeleton and plays important roles in the dynamics of cell morphology and motility. Overexpression and loss-of-function o...
Cell study leap forward for tissue engineering, diseases
...rd fails to develop properly." Using tissue from frog
embryos, Ninomiya and Winklbauer studied "convergent extension" (a process in which a tissue elongates as cells change their positions) and how it relates to cell differentiation. By administering different doses of activin, a protein known to induce...
XsalF comes to the fore in brain regionalization
...XsalF was originally identified in a screen of the frog
anterior neural plate, a structure that appears early in neural development. Sequencing of the gene, and analysis of the timing and spatial pattern of its expression showed that it codes a transcription factor related to Spalt and is expressed in the...
Frogs muscle-in on 'wasting' process
Scientific studies of a unique Australian frog
could lead to the development of new ways to impro...ellow, Dr Nick Hudson, the green-striped burrowing frog
(Cyclorana alboguttata) can remain buried in mud for months in an inactive state known as 'aestiva...
Nutrients cause increase in parasites and frog deformities
... higher levels of parasite infection and, in turn, frog
deformities. These results may help to both explain the recent increase in amphibian malformations and to suggest control strategies for reducing malformations and mortality associated with infection....
Biologists discover nerve activity, not just genetics controls kinds of neurotransmitters produced
... increased or decreased the electrical activity in frog
embryonic spinal nerve cells by altering the current through nerve cell membranes with drugs or by genetic manipulation. They found that increases in activity increased the levels of neurotransmitters that inhibit the activity of nerve cells across t...
Without words, bullfrogs communicate through stutters in their croaks
...oundaries with other males, and indicates that the frog
is healthy and aggressive. "Some animals have evo...single stutter. Stuttering did not occur because a frog
was "running out of breath," said the researchers. If that were the case, a less structured pattern ...
Dramatic decline of California native frog linked to introduced trout in mountain lakes
...howed that introduced trout have devastated native frog
populations over the past 50 years in formerly fis...l Academy of Sciences. "The mountain yellow-legged frog
used to be the most common inhabitant of the high Sierra, but frog
populations have declined dramati...
Stretching DNA on a tiny scale, researchers probe the basis for its compaction
...nteractions with Condensin complexes isolated from frog
eggs. Because the helical DNA could be twisted, the scientists were also able to investigate how DNA topology in this case, topological states called positive and negative supercoiling might affect its ability to be compacted by Condensin. Such mea...
Out-of-balance ecosystems play role in demise of amphibian populations
..., showed that about 16 percent of northern leopard frog
tadpoles infected with Ribeiroia during the limb-b... seem to contribute to declines and deformities in frog
populations, the challenge is to find management approaches that put balance back into amphibian eco...
JGI launches community sequencing program
...sms currently under investigation are a species of frog
(Xenopus tropicalis), the alder tree (Popular trichocarpa), and a type of green algae (Chlamydomonas reinhardtii ).The first deadline for proposals is Feb. 20. For additional information on the CSP and for those interested in submitting sequencing p...
Feeder-free system for maintaining pluripotency in embryonic stem cells pioneered
... to mimic Wnt activation in the classical model of frog
early embryonic development. In the process, Briva...fely could arrest differentiation of stem cells in frog
embryos, while allowing them to continue to self-renew. Thus far, Brivanlou has applied the BIO comp...
History of frog deformities suggests emerging disease
...ogy and lead author of the recent paper, says that frog
deformities have been a hot topic since the mid-19...idence, Johnson and his collaborators classify the frog
and other amphibian deformities as an emerging disease, one that has substantially increased in occu...
USGS December science picks!
...usgs.gov . USGS "Croaks" the Case : Thousands of frog
tadpoles, including critically endangered species, are dying from a new disease recently discovered by a USGS scientist. Since 2000, tadpole die-offs have been reported in Maine, New Hampshire, Maryland, Virginia, North Carolina, Florida, Mississipp...
Findings in frog oocytes may help study of chromosome physiology
...MPAIGN, Ill. -- Researchers studying the nuclei of frog
oocytes in early stages of meiosis -- the cell div...ations inside the nuclei of gametes of the African frog
Xenopus laevis. (The research will be on display as a poster presentation Aug. 17-22 during the Gord...
Chirping frogs keep UH scientists hopping
... developing frog, meaning it hatches directly to a frog
from an egg, outside a tropical climate. Wells hopes to find out how and why the frog
has developed the ability to skip a lifecycle vital to other amphibians."Amphibians are supposed to ...
U of MN researchers identify protein that causes cell nucleoli to disassemble
...ixing somatic cell nuclei and protein extract from frog
eggs to purify the proteins responsible for nucleolar disassembly. Kikyo identified the proteins, FRGY2a and FRGY2b, that disassemble nucleoli without help of other proteins. The nucleoli are later reassembled as they normally would be. The study s...
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