Tag: "origin" at biology news
Scientists Trace Roots Of Protein That Keeps Antarctic Fish From Freezing
...in Antarcticfish have traced the protein's genetic origin
and historical roots. They'vealso provided an example of convergent evolution by ruling out the suspectedcommon ancestry with an antifreeze-bearing Arctic fish. Almost identical antifreeze glycoproteins are produced independentlyby two unrelated fis...
Bacterium gobbles up chlorinated pollutants
...mally needed to support growth." The evolutionary origin
of Strain 195 is just one of the questions on the research agenda for the Cornell microbiologists....
Where Fossils Fear To Tread: Scientists Follow Genes To An Ancient Ancestor
...prior to the Cambrian is so scant nobody knows the origin
of animal life," said Carroll. But now "we're drawing a picture of something no one has ever seen." Carroll is one of a growing number of scientists now using the techniques of modern molecular biology to look into the murky waters of distan...
Fossils Show British Columbia Was Once 2,000 Miles South
... This study of fossils to confirm the ancient origin
of rocks, says Ward,brings new excitement to a theory that gigantic blocks of rock "drifted that farthat quickly."...
Growth Factor Stimulation Leads To Increase In New Neurons In The Striatum And Cortex Of The Brain
...erative layerof the subventricular zone (SVZ), the origin
of neurons destined for thestriatum and cortex. In order to track newly generated cells, they administeredthe cell proliferation marker BrdU along with the BDNF to label the cellsgenerated during infusion of the brain with the growth factor. ...
A Mutation In The CCR5 Coreceptor Slows HIV Disease Progression In Children Born To Seropositive Mothers
...ren born to HIV-1-seropositive mothers of European origin
1 werestudied 2 . The delta 32 mutation was screened in both infected (n=276) anduninfected children (n=236). The proportion of heterozygotes was found to besimilar in the two groups. This showed that, like in adults, childrenheterozygous for the d...
American Museum Of Natural History Researchers Announce Discovery Of Oldest Known Fossil Ants - 92-Million-Year-Old Fossils Found In New Jersey Amber
...e importantimplications for understanding both the origin
of ants and their rise to aposition of ecological ...n yearsago. A reasonable estimate would place the origin
of ants in the LowerCretaceous at about 130 million years ago. Ant fossils from the Cretaceous Perio...
Transposable Elements May Have Had A Major Role In The Evolution Of Higher
...r. Two major events in the historyof life were the origin
of eukaryotes (multicellular organisms with well-definedcell nuclei) and vertebrates. The evolution of these "higher" forms of lifeobviously meant a quantum increase in the number of genes needed to directcellular functions. A scientist at the Univer...
Summary Of USGS Presentations And Activities, AAAS, 1998
... addresspetroleum topics ranging from its American origin
in Pennsylvania,responsiveness to environmental concerns, forthcoming dramatic changes andtechnological developments, and the linkage to societal issues. * 3:00-6:00 p.m. - Gary Waggoner, a USGS biologist at the Center forBiological Informatics in...
New Sickle-Clawed Fossil From Madagascar Links Birds And Dinosaurs
...o doubt that dinosaurs had anything to do with the origin
ofbirds," stated Forster. Forster added, "Rahona was at the base of the bird family tree, rightnext to Archaeopteryx. It had a feathered wing and many bird features in itships and legs, including a perching foot. But it also kept the big ki...
How Did Life Begin? Biochemical Evolution On Chemical Surfaces
...fe. "The problem with most theories on the origin
of life is that there is too muchwater around for ...e thekey to the chemical evolution that led to the origin
of life. It's possiblethat mutinaite, which has aluminum in place of silica, loses aluminum at itss...
"A Thousand (And More) Points Of Light" Yield New View Into Cells
...out-of-focus light isreassigned to its position of origin
by means of a novel algorithm developed incollaboration with Frederic Fay, now deceased, and his colleagues at theUniversityof Massachusetts Medical School. This algorithm, called Exhaustive PhotonReassignment, requires the power of a parallel comput...
Gene Study Shows Mammals Lived Before Extinction Of The Dinosaurs
...searchers found that their molecular clock yielded origin
dates similar tothose based on fossil dating for m...tudy of gene sequencesever done for estimating the origin
of so many species," Kumar comments. Very few fossils resembling modern mammals or other vertebrat...
The First Rejection: Eggs Sequester Bits Of Sperm For Later Elimination
...ve isolation, one of the driving forces behind the origin
Precursors To Red Blood Cells Form Earlier Than Previously Thought
...ody regionof the fetus. However, the developmental origin
of these stemcells has not been clearly elucidated... thedevelopmental process may provide clues to the origin
of bloodstem cells and the environmental conditions that support theirexpansion for use in bone marr...
New Fossil Discoveries Clinch Ancient Age Of Human Ancestor
...ock and ancient soils, because a definite time of origin
could not then be measured for the youngest layer. "The fossils found in younger deposits were the most human-looking, so some people said we could have two species instead of just one--an older one and a much younger one," Walker says. "In 1...
ASU Scientists Join NASA Astrobiology Institute
...sources for the early chemistry that preceded the origin
of lifeon Earth, biochemist John Cronin and new A...orld-class meteorite collection.) In exploring the origin
and early evolution oflife, geochemist John Holloway and his colleagues will be study the organicche...
Tiny Jamaican Tree Crab Made Big And Fast Evolutionary Leap, Scientists Discover
...olecular clocktakes you back to the actual time of origin
of the species," Hedges explains. The scientists calibrated this molecular clock to an evolutionary event wellestablished by geological studies, the closing of the Panama land bridge betweenNorth and South America 3.1 million years ago that separat...
Veterinarians' Input On Olympics Horse Events Has Had Global Impact
...the timeas in the 45 degrees common to the event's origin
in Northern Europe. At the U. of I., under the same steamy conditions, Foreman found thathorses could not cool off during the post-steeplechase trot. In subsequentlaboratory tests, Foreman determined that stopping twice for ice-water bathsallowed t...
The Shape Of Life: How Does The Computer "Know" When It Sees It?
...in analyzing the origin
of astrobiologicalsamples," Noever said, citing theimportance of Thompson's contribution to astrobiology. The Unusual Suspects Noever plans to use shape to identify life forms just as a detective usesfingerprints to identify suspects. But siftingth...
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