Researchers Discover First Animal Strain Of Hepatitis E Virus
... Furthermore, the degree of genetic divergence of the swine virus from human hepatitis E virus suggests that it has been around for a long time." In addition to the NIAID scientists, collaborators on this study include...Early Career Development Grants Foster Faculty Research And Education
...nto the reproductive success, behavior and genetic divergence of many organisms. Ballard will integrate his research with a science educationprogram for young women and minority groups in Chicago schools. The education program aims to build students' knowledge and interest in environmental biology. Viola L. ...Gene Study Shows Mammals Lived Before Extinction Of The Dinosaurs
...onary event well establishedby fossil studies--the divergence of birds and mammals about 310 million yearsago. "A clock isn't any good unless it is calibrated to a time that everyoneelse agrees on," Hedges explains, "and just about everyone agrees on the datewhen reptilian ancestors of birds and mammals appear...Genetic Study Reveals Sumatran Tigers Are A Distinct Species From All Mainland Tigers
...elbetween 6,000 and 12,000 years ago. The genetic divergence of Sumatrans fromother tigers mirrors the divergence already recognized as having occurred in theSumatran rhinoceros, which is distinct from mainland rhi...Ancient 'Volcanic Winter' Tied To Rapid Genetic Divergence In Humans
...ht about the rapid"differentiation" - or genetic divergence - of the surviving populations. The hypothesis, offered by anthropologist Stanley Ambrose of the Universityof Illinois, proposes that a volcanic winter reduced populations to "levelslow enough for evolutionary changes, which occur much faster in sm...Adaptation's Basis May Be A Mix Of Genetic Tweaks, Whoppers
...on from otherpopulations permitted so much genetic divergence -- enough eventhat the island species now subsists on a fruit that's toxic toall other species -- that it's now considered a distinct species,incapable of breeding with its ancient brethren. While almost all scientists accept the theory of evolu...University Of Chicago Researcher Receives Packard Fellowship
...d. Others believe that intronsdeveloped after the divergence of prokaryotes and eukaryotes because bacteriadon't have introns. Long suspects that bacteria once had introns and lost them millions ofyears ago to facilitate faster replication. Bacterial cells can mutate rapidlyto adapt to new environme...Large Gene Study Questions Cambrian Explosion
...onary eventwell established by fossil studies--the divergence of birds and mammals about310 million years ago. "A clock isn't any good unless it is calibrated to atime that everyone else agrees on," Hedges explains, "and just about everyoneagrees on the date when reptilian ancestors of birds and mammals appear...Jurassic period mammal teeth found; prevailing theories challenged
...t molecularly-based estimates of a Middle Jurassic divergence betweenthe major groups of extant tribosphenidans, also called therians, said Wyss."They try to predict how long ago they shared an ancestor. The fossil recordindicates that the divergences between many kinds of living mammals are notnearly as ancien...New evidence pushes back age of sex-determining chromosomes
...ely 240 to 320 millionyears ago, shortly after the divergence of the evolutionary lines leading tomammals and birds. "The first events that created the sex chromosomes had been thought to haveoccurred at least 170 million years ago," said <AHREF="http://www.hhmi.org/science/genetics/page.htm">David Pag...Hominoid genes meet on middle ground
... 25 million years ago, well after the evolutionary divergence of hominoids from Old World primates. Indeed, Old World primates, such as the baboon, possess far fewer CAGGG repeats than hominoids, such as the human, indicating the repeats themselves multiplied after the divergence. Altogether, these data sugge...Lizard research bolsters theory that forest edges are hotbeds of speciation
...eographic isolation alone is the key to population divergence and speciation." "The skink work strengthens our ideas that this is not just something happening in a few bird species in Cameroon. It's happening in another rainforest, with different taxa," says Smith. Because preserving the processes th...Gene tug-of-war leads to distinct species
...ers -- because they may reflect a rapidly evolving divergence between species that prevents viable interbreeding. This divergence may be "epigenetic" -- involving easily changeable control elements that alter the expression of gen...Biologists uncover Darwins missing evidence for divergence of species in a warblers song
...cur." Biologists have generally learned about the divergence of species by comparing many different species at ...of the intermediate steps that occurred during the divergence of one species into two." In their paper, the scientists show how they discovered a gradual variati...DNA deletion offers new evidence of mammals' origins
... biologists have a very simple explanation for the divergence and resulting evolutionary tree. The relationships which evolved closely parallel the movement of continental land masses during geologic time. That's why Springer named one group Afrotheria for its African origins and another Laurasiatheria after t...Darwinian evolution of reproductive proteins in mammals
...ersity study. New statistical studies of sequence divergence among egg-surface and oviduct proteins, reported by Willie J. Swanson, Mariana F. Wolfner and Charles F. Aquadro of Cornell University and Ziheng Yang of University College London (UCL) in the Feb. 27, 2001, Proceedings of the National Academy of S...NASA satellite tracks hazardous smoke and smog partnership
...ologies added in 1997 enabled scientiststo see the divergence of smoke and smog for the first time. The differen....; andHokkaido University of Japan, explaining the divergence ofthe pollutants, appears in the March 16 issue of Science....Researcher finds that important fungal "scaffolding" genes belong to one of four classes
...se in a common ancestor of fungi and animals after divergence of the green plants. It is also possible that septins arose in an earlier common ancestor shared by green plants, fungi and animals and were later lost. That fact may wind up being a lucky break for those in agriculture, however. Since septins are i...New finding accelerates discovery of disease genes and human population history
...of northern Europeans must have occurred after the divergence from the Sub-Saharan Africans, which estimates say occurred about 100,000 years ago. What the bottleneck event was is unclear, say the researchers. It could have been a contraction associated with only a few people emerging from Africa to found most ...International scientists probe unsolved puzzles of the Earth and beyond at "Earth System Processes"
...in less than 30 million years and produced a major divergence of aerobic and anerobic organisms. It is also probable that Earths early atmosphere already contained appreciable amounts of ozone and methane, providing a theoretical justification for NASA programs to detect life on other planets by searching for o...