Tag: "lineage" at biology news
Strains of laboratory mice more varied than previously thought
...nal Institutes of Health, the researchers analyzed lineage
and sequence variation based on the most extensive genetic data sets of inbred mouse strains. This information came from the National Institute of Environmental Health Sciences (NIEHS). In testing the Y chromosomes and mitochondria for ancestry, t...
What determines the speed at which birds fly?
...flects functional constraints and the evolutionary lineage
of the species in question. The authors argue that only empirical measurements of flight speeds enable you to evaluate how general such aerodynamic rules really are. They used tracking radar measurements of the cruising speeds of migrating birds (...
Clues to future evolution of HIV come from African green monkeys
...us, or SIV, first infected those monkeys after the lineage
split into four species. The new research reveals ...V infected an ancestor of green monkeys before the lineage
split, much longer ago. "Studying SIV helps us learn more about HIV," said the paper's first auth...
Californians urged to help reduce spread of Sudden Oak Death
...eages of P. ramorum. "By being able to track which lineage
is found we can better track where infested material is coming from, track the spread patterns, and be aware of the presence of different lineages in a single location, which is cause for concern over the different lineages potentially mating," Frank...
Glimmer of hope for Tahitian tree snails' survival
...970 museum specimens. Although severe winnowing of lineage
diversity has occurred, none of the five primary Tahitian Partula taxonomic groups, or clades, present in the museum samples is extinct, they found. In addition to their implications for the tree snails, the findings point to the conservation value...
Marine worm opens new window on early cell development
...o that, given the invariance of the embryonic cell lineage
and the prevalence of asymmetric cell divisions, has been viewed as a classic example of mosaic development, Schneider and Bowerman wrote in their conclusion. There are some 10,000 species of polychaete annelids, dating back to the Paleozoic era, w...
UI anthropologist, colleagues discover remains of earliest giant panda
...ed for more than three million years as a separate lineage
apart from other bears and was adapted to eating bamboo very early in its development. Pandas are very unique bears - the only bear species that is known to exist wholly on a vegetarian diet, says Ciochon. The evolution of this unique dietary speci...
The opossum genome sequence casts light on evolution, immunity and disease
...um genome, which is higher than any other amniotic lineage
studied to date." Gentles and his colleagues als...ed 2,733 genes that have duplicated in the opossum lineage
since its divergence from humans ~170-190 million years ago. These genes contribute to unique physi...
Robust time estimation reconciles views of the antiquity of placental mammals
...erm acceleration of mitochondrial genome along the lineage
leading to Laurasiatheria. The revised time at the root of placental mammals was much younger than the preceding reports, 84 million years ago instead of around 122 million years ago. As a result, the estimated distribution of molecular divergence ti...
DNA sequence of Rhesus macaque has evolutionary, medical implications
...shown to have expanded dramatically in the primate lineage
but much more so in humans than macaques. In contrast, another gene family the HLA complex is much larger in macaques and may play a key role in defining their immune response. Analysis of chromosomal rearrangements that could not be detected by...
LSU professors monkey around with the Rhesus Macaque genome
...umans and chimps but diverged from the human-chimp lineage
approximately 25 million years ago, still shares about 93 percent of its genome sequence with humans. This makes the macaque an integral part of primate evolutionary studies and could allow researchers to gain a better understanding of HIV/AIDS in hu...
Third primate genome, the rhesus macaque, helps illuminate what makes us human
... relative. This old world monkey diverged from our lineage
25 million years ago. "Because the macaque is further away from us in evolution than the chimp, it provides good contrast when the three genomes are compared," he added. In evolution research, 25 million years is close, and comparing the three genome...
Do we need a paradigm change? Disputing coevolution in herbivorous insects
.... In addition, chrysomelids feeding on the ancient lineage
of monocotyledons (grasses, palms, etc.) have arisen at least on two occasions, refuting earlier claims of their monophyly, their unique evolutionary origin, and illustrating the importance of host shifts. Hence, the coevolution hypothesis can be rej...
In young mice, gregariousness seems to reside in the genes
MADISON -- Beyond the lineage
of primates, according to scientific gospel, social behavior is dictated primarily by competition for resources such as food, territory and reproduction. That may well be true for many adult animals, but in a groundbreaking study researchers from t...
JCI table of contents: April 2, 2007
...lvania School of Medicine, Philadelphia, trace the lineage
of beta cells and show that beta cells do not arise from acinar cells. Instead, they found that acinar cells gave rise to more acinar cells. By contrast, in a second study appearing in the April issue of the Journal of Clinical Investigation, Ahmed ...
New cell type identified in cancer development
...llmarks of normal bone marrow stem cells, nor the lineage
markers most of the cancer cells had, but they did exhibit stem-like structure. The researchers suspected these unusual cells might be precancerous stems cells and designed several tests and experiments to find out more about them. They selected th...
Aging boosts chances that a family line will be long-lived
...l then a lot of damage will be eliminated from the lineage
when that individual dies," said Carl Bergstrom, a...ors individuals aging as a means of allowing their lineage
to persist longer. "A lineage
is more likely to survive in the long run if one individual falls o...
Shilatifard and colleagues identify a potential target for treatment of mixed lineage leukemia
... gene, the Drosophila homologue of the human mixed lineage
leukemia gene, MLL. MLL, which is found in translo...verse histone trimethylation associated with mixed lineage
leukemia. This, in turn, may allow for the identification of new targets for the treatment of leukem...
Man's best friend lends insight into human evolution
...g to Hare it seems to have evolved since the human lineage
split from that of chimps a few million years ago. For Hare, who has worked with a number of different animal species, to understand the "unique" human ability to use social cues cooperatively we should look not just at our closest animal relatives...
New study rewrites evolutionary history of vespid wasps
...tion, which placed the groups together in a single lineage
with a common ancestor. Eusocial behavior is quite rare, and generally involves the breeding of different reproductive classes within a colony. The sterile members of the group perform tasks that support their fertile counterparts. Eusociality occu...
1 2 3 4 5 6