Climate change plus human pressure caused large mammal extinctions in late Pleistocene
...Evidence of mammoth kills date from near the first appearance of stone spearheads made by the human Clovis civil...r a period of, at most, 1,500 years, following the appearance of Clovis-style hunters, camels and horses, rhinos and peccaries, short-faced bears and saber-toothe...Hidden diversity: DNA 'barcoding' reveals a common butterfly is actually 10 different species
...Because the adults differ at best only slightly in appearance -- so slightly that it was attributed to ordinary "variation" -- this finding may have larger implications for maintaining biodiversity. "It raises the questions of how many other species out there are really multiple species like this one and what t...Snakehead in your inbox? Welcome to the nonindigenous Aquatic Species Alert System
...e a forum to exchange information and document the appearance of species in new locations."Nonindigenous aquatic species are members of a species that enter a body of water outside of their historic native range. An invasive species is a nonindigenous species whose introduction causes, or is likely to cause, h...Men from early middle ages were nearly as tall as modern people
...t is notable that bubonic plague made its dramatic appearance in the late Middle Ages, when trade really took off," he said. Steckel cites several possible reasons why height declined toward the end of the Middle Ages: The climate changed rather dramatically in the 1300s, when the Little Ice Age triggered a coo...Study of flu patients reveals virus outsmarting key drug
...ensively used, then we may be faced with the rapid appearance of resistant viruses," Kawaoka says. At present, there are only two strategies for stemming the spread of influenza: vaccines and antiviral drugs. Vaccines use inactivated forms of a virus to ramp up the immune system and thwart infection. Antiviral ...Two warbler species find the West isn't big enough for both of them
...t its dark feathers are much less dominant and its appearance is less striking. The hermit warbler is now mostly confined to coastal forests in Washington, Oregon and northern California. There are three known places two in Washington and one in Oregon where the two species overlap. In these "hybrid zones,"...Nucleic acid-amplification testing further safeguards nation's blood supply
...ral genes rather than antibodies or antigens. The appearance of antibodies requires time for the donor to develop an immune response, and detection of antigens requires time for a higher level of virus to appear in the bloodstream. With the use of NAT for HCV, the window period is reduced by approximately 57...Prions act as stepping stones in evolution
..., St. Louis. "How exactly did the prion change the appearance of the cell?" The answer revealed a twist in the traditional understanding of how traits are inherited. In order for Sup35 to ensure that the cell properly reads the protein recipes contained in genes, it focuses on what are called "stop codons"--se...Small animal imaging gives cancer clues
...e entire area involved, Borowsky said.Based on the appearance of a DCIS under the microscope, doctors canestimate how quickly it could become a more aggressive, invasive formif not completely removed, he said. The new PET technology allowsresearchers to follow the same changes in a mouse without surgery. "Not ...U-M scientists find common virus in human prostate tissue
...f architectural and cytological differences in the appearance of epithelial cells lining the glands in the prostate," says Rajal B. Shah, M.D. M.B.B.S., a clinical assistant professor of pathology and urology in the U-M Medical School and co-author of the study. "Several recent studies have demonstrated that th......rs. *The term "Argonaute" refers to the squid-like appearance of the leaves of Arabidopsis mutants lacking AGO1 gene function (Bohmert et al., 1998). See also the Greek myth Jason and the Argonauts and the squid, Argonauta argo....OHSU researchers discover possible method for early detection, prevention of premature birth
... also the length of time between infection and the appearance of these biomarkers. "Biomarkers for infection were detected in a very short amount of time, within only 12 hours of infection," explained Nagalla. "In addition to animal studies, we studied pregnant women to confirm that the data gathe...Bone, enamel, dentine, milk & saliva share gene family
...ng are done by molecular clock calculations. The appearance of these mineral tissue genes after the split can shed light on the murky period when creatures developed backbones for internal support, sharp teeth for eating and protection, hard shells to protect developing young and milk to nurture them until th...Scientists describe the world's smallest, lightest fish
...cientists note that the stout infantfish's unusual appearance corresponds with its extremely short lifespan, which is believed to be approximately two months. Many features characteristic of a larval stage of development appear even though it is fully mature. "It's interesting that these animals experience seve...Long-term heart damage may result from constant confrontation and defeat
...uces permanent cardiac structural changes with the appearance of numerous scattered microscopic foci of fibrosis. This offers a hypothesize that a psychosocial challenge of longer duration might be able to produce a more severe structural damage, which in turn represents a substrate predisposing to higher susce...Warren Pharmaceuticals publishes results of preclinical evaluation
...d sustained use in non-anemic patients without the appearance of classical EPO side effects. This new work demonstrates that these molecules provide neuroprotection against stroke, spinal cord compression, diabetic neuropathy and are effective in a rodent model of multiple sclerosis, while showing no erythropoi...Gene mutation causes progressive changes to cell structure in children with Progeria
... rare, fatal genetic condition characterized by an appearance of accelerated aging in children. "Although it is a rare disease, Progeria has long been considered to be a model for studying the mechanisms responsible for normal aging" said lead author Robert D. Goldman, Ph.D., Stephen Walter Ranson Professor and...LARGE protein can overcome defects in some types of muscular dystrophy
...ociated with dystrophic muscle and instead had the appearance of healthy tissue. Importantly, the researchers also found that expression of LARGE did not have any pathological effects on normal muscle tissue when injected into healthy mice. The researchers next tested the mice to determine whether the physiol...UF researcher: New low-carb potato to debut in January
... "Consumers are going to love the flavor and appearance of this potato and the fact that it has 30 percent...ons, this variety develops an extremely attractive appearance in terms of brightness of skin and smooth appearance," Northcott said. He said the ......f this biomedical model organism to manipulate the appearance of the fish. Fish were chosen to have drastically different color patterns, either blue and gold stripes or an absence of stripes and a uniform mother-of-pearl color. This difference was the result of a single DNA base change in the fish's genome. To...