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Tag: "evidence" at biology news

Evolution of taste receptor may have shaped human sensitivity to toxic compounds

Researchers have found new evidence suggesting that the ability to taste bitter compou...enting 60 human populations, the researchers found evidence that specific variants of the receptor gene have been strongly favored in the early stages of human ...

Stem cells grown in lab mirror normal developmental steps

...t million years ago. They also present intriguing evidence that the sharp drop in carbon dioxide level, between 33 - 25 million years ago, prompted the origin of economically important land plants that are sensitive to atmospheric carbon dioxide levels, such as corn and sugarcane. "The onset and stabilizati...

Major breakthrough in the treatment of cancers and infectious diseases

...e on August 28 in Nature Immunology, gives genetic evidence for the inhibiting role of EAT-2 in NK cells. It is the product of over five years of intensive research by Dr. Veillette's team. More specifically, by studying mice in which the EAT-2 protein is eliminated through genetic manipulations, Dr. Veillet...

New insight into autoimmune disease: Bacterial infections promote recognition of self-glycolipids

... the immune system to go awry, there is increasing evidence that in some cases infections with viruses or bact...y published in the June issue of Immunity provides evidence that bacterial infections induce a kind of self-recognition that may contribute to some autoimmune d...

New insights into how Huntington's disease attacks the brain

...ychiatric Institute study reveals the first strong evidence that the mutant protein also elicits toxic interac...of the disease. "This is the first direct genetic evidence to demonstrate that abnormal interactions between cells can significantly contribute to brain cell d...

Tufts researchers shine light on firefly mysteries

...ng. But the Tufts research team has recently found evidence suggesting that the preferred males in a related species (Photinus greeni) do not provide any such benefit. "It's possible that the male flash pattern may have evolved to provide misinformation," Lewis explained. "Although males and females both try...

Fluorescing lab worms signal longer life spans

...undworms could double their life span -- the first evidence that the lifespan of an animal could be increased by genetic alteration. Since then, researchers around the world have been tinkering with proteins and genes of C. elegans in attempts to understand more about how life span can be increased. Although...

Unraveling a stomach cancer puzzle

...other important roles in the body. Add to that the evidence suggesting that Stat3 is also involved in breast, head and neck, and prostate cancers, and we have a compelling case for investigating the development of therapies that target Stat3." ...

Can our genes tell the story of our divergence?

...s well as spermatogenesis, but found the strongest evidence for positive selection in genes related to immune defense. Immunity genes, the authors explain, were likely targeted throughout mammalian evolution, while the perception and olfactory genes probably reflect primate-specific adaptations. Nielsen et a...

Bumblebees copy one another when contending with unfamiliar flowers

...uing new contribution to the ever-growing stack of evidence suggesting that insect foraging behavior is surprisingly complex. ...

Drug Offers Alternative to Surgical Treatment After Miscarriage

...in treating that condition. However, no definitive evidence existed to determine whether the drug was safe and effective enough for routine medical practice. For the current study, Dr. Zhang and colleagues at several institutions enrolled 652 women who experienced pregnancy failure. Of these, 491 were assign...

Could better mangrove habitats have spared lives in the 2004 tsunami?

...the energy from the tsunami waves, and they showed evidence of damage in some cases, but the researchers found few examples of mangrove trees actually being uprooted. However, mangroves at numerous sites had experienced pre-tsunami degradation. This disruption, resulting from human impact, included "cryptic ...

Sleeping Sickness Epidemic Spreading in Uganda

...in treating that condition. However, no definitive evidence existed to determine whether the drug was safe and effective enough for routine medical practice. For the current study, Dr. Zhang and colleagues at several institutions enrolled 652 women who experienced pregnancy failure. Of these, 491 were assign...

Unexpected lock and key mechanism found for the assembly of tumor blood vessels

...le called VCAM, so the researchers next looked for evidence of VCAM in the vascular smooth muscle cells, called pericytes. Indeed, Varner's team found VCAM on the nascent blood vessel's pericytes, but not in mature vessel pericytes. The two molecules, Varner discovered, work together to bring the endothelial...

Stem Cells to Solve the Blood Shortage Problem?

...the energy from the tsunami waves, and they showed evidence of damage in some cases, but the researchers found few examples of mangrove trees actually being uprooted. However, mangroves at numerous sites had experienced pre-tsunami degradation. This disruption, resulting from human impact, included "cryptic ...

Neandertal femur suggests competition with hyenas and a shift in landscape use

...humans lived in it, the authors say. Archeological evidence indicates that humans processed carcasses of the same animals as the hyenas, with some animal bones showing both cut marks from human tools and tooth marks from hyenas. Additionally, the human femur was gnawed by carnivores, probably hyenas. This sho...

Identification of specific genes predicts which patients will respond to Hepatitis C treatment

...elpful for patients because it's one more piece of evidence that we hope will encourage 'responder' patients to start and continue treatment for Hepatitis C, despite it's many side effects," said Dr. Jenny Heathcote, a hepatologist at Toronto Western Hospital, University Health Network and Professor of Medici...

New protein vital for immune response is found in surprise location

...cell into making interferon. He also said there is evidence that MAVS binds with RIG-I, but more experiments are needed to determine just how MAVS functions within the cell. Other UT Southwestern researchers involved in the studies were lead authors Rashu Seth, a graduate student research assistant, and Dr. ...

Scientists track stealth DNA elements in primate evolution

...k A. Batzer, provides the first strong mechanistic evidence for the evolution of Alu elements to date. It appe...pagation and persistence over time. However, prior evidence from the Ya5 subfamily indicated that at least some "master" Alu elements may persist in low-copy nu...

Siberian tigers hang tough

... people, and seldom seen, tigers nonetheless leave evidence of their presence with their massive footprints in the snow. With some workers spending months in the field and covering over 21,000 km (13,000 miles) of transects by foot, ski, snowmobile, and car, over 4,100 tracks were recorded, most representing ...

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