Tag: "less" at biology news
Climate change plus human pressure caused large mammal extinctions in late Pleistocene
...f hunting that could have knocked off a species in less
than 500 years. Another suggestion, dubbed "sitzkrieg" after the term for a "sitting" war that shows slow or no progress, is that humans caused extinction through long-term habitat alteration. Barnosky and his colleagues found sparse evidence outside...
New study shows hope for treating inhalant abuse
...ed to expect toluene in a given location spent far less
time "seeking" toluene in that location after being treated with GVG than animals treated with a placebo. This elimination of conditioned place preference -- a model of craving in which animals develop a preference for a place where they have previou...
Researchers determine genetic cause of Timothy syndrome
...eart, but its role in other parts of the body were less
clear," said Keating. Studies of the pattern of activity of the gene for the channel in humans and mice revealed that it was expressed not only in heart muscle cells, but also in adult and fetal tissues of the brain, gastrointestinal system, l...
Belgian researchers explore revolutionary approach to angiogenesis
...a study in mice that the arterioles (blood vessels less
than 0.5mm in diameter) that feed tumours have the ability to contract in response to increases in pressure within their lumen (the space within the blood vessels). Equivalent sized blood vessels in healthy tissue can't do this. "What this means is t...
Chemical derived from vitamin-E shows early promise as cancer drug
...d that mice treated with aerosolized alpha-TEA had less
than half the number of lung micrometastases as untreated mice (an average of 31 versus 73 detected cancer cells or small clusters of such cells). In addition, 48 percent of nearby lymph nodes of those mice lacked any microscopic signs of cancer, tho...
Cancer vaccine based on pathogenic listeria bacteria shows promise targeting metastases
...e in the vaccinated mice, but with a thousand-fold less
toxicity than the wild bacteria. Cerus then took the genetically engineered listeria and inserted cancer antigens, again using a technique developed by Portnoy, then infused the vaccine into the mice. All showed tumor regression and reduced lung meta...
'Most recent common ancestor' of all living humans surprisingly recent
..., the most recent common ancestor would have lived less
than 1,000 years ago. He also introduced the "identical ancestors point," the most recent time -- less
than 2,000 years ago in the simplified model -- when each person was an ancestor to all or ancestor ...
Genetic differences might help distinguish thyroid cancers
...R) technology, which is far more available and far less
costly than microarray analysis. Other Ohio State researchers involved in the study were first author Micheala A. Aldred, Sandya Liyanarachchi, Natalia S. Pellegata, Sissy Jhiang, Ramana V. Davuluri and Albert de la Chapelle. ...
Far more men than women favor routine paternity testing at birth
...us. Previous studies have shown that generally less
that 1 percent of married women bear children fathered by men other than their husbands. The exceptions are studies conducted among women living in extreme poverty in the United States, Mexico and England, where the rate was as high as 10 percent. ...
UCSF scientist Joe Derisi named MaCarthur Fellow
... the microarray to studies of diseases that, while less
sensational in their debut, wreak havoc on people's lives. In collaboration with infectious disease specialist Don Ganem, MD, and pulmonologist Homer Boushey, MD, he is studying the viruses that may cause or exacerbate respiratory illnesses, includin...
Researchers devise potent new tools to curb ivory poaching
...n 300 miles and 80 percent were accurate to within less
than 600 miles. Accuracy was much greater among forest populations, which are more clearly defined because of terrain. The new method allows for speedy determination of where a particular ivory sample came from, Wasser said. That is important becaus...
Indiana University, EPA to study airborne PCBs
...t 10 times higher than PCB levels at the decidedly less
urbanized study site at Eagle Harbor on Michigan's...The scientists found that wild salmon tended to be less
contaminated. Another study, published last year in the National Institutes of Health journal Enviro...
Rice finds 'on-off switch' for buckyball toxicity
...ntified specific alterations that render them much less
toxic. "There are many cases where toxicity is desirable," said Vicki Colvin, CBEN director, professor of chemistry and chemical engineering, and the principal investigator for the research. "For example, we might want particles that kill cancer cell...
UCI scientists successfully target key HIV protein; breakthrough may lead to new drug therapies
...roved toxic to cells. He is now seeking to develop less
toxic compounds that will have high potencies against Nef without causing collateral damage. A key benefit of this achievement, he added, would be the development of therapies using smaller molecules, which can often be used in oral medications. Ther...
Females may be more susceptible to overindulge 'sweet tooth' cravings than males
...he temptation to overeat? And could exercise be a less
effective method of appetite suppression in women ...ke reduction associated with the exercise was much less
dramatic in the female rats, and unlike male rats, female rats exercised less
when sweet foods were...
Enzyme maintaining chromosome ends is linked to bone cancer recurrence, decreased survival
...nce a recurrence of the cancer after treatment and less
likely to survive if the cancer cells are expressing the telomerase gene. This finding, from investigators at St. Jude Children's Research Hospital, appears in the current issue of the Journal of Clinical Oncology (JCO). Osteosarcoma is the most comm...
Anthrax enzyme images reveal secrets of antibiotic resistance, suggest new drug design
...get within the enzyme structure that would be much less
likely to develop resistance to an antibiotic, the researchers say. "Until now, no one had produced images of sulfa drugs binding to DHPS," said Stephen White, Ph.D., chairman of the St. Jude Structural Biology department. "Without that kind of vis...
New fossil sheds light on old mystery
...ts concluded that the long, stiff neck was more or less
a consequence of growth patterns rather than a spe... to draw near its prey stealthily so it would have less
of a chance of being detected. "To a fish in murky water, Dinocephalosaurus' head would have initial...
A long-necked sea predator from China described in Science
...s almost twice as long as its trunk which measured less
than one meter in length. These findings appear as...e, the new fossil's long neck contains 25 somewhat less
elongated neck vertebrae. With relatively short and broad limbs containing few bones, Dinocephalosa...
Termites could hold the key to self-sufficient buildings
...services (e.g. heating and ventilation) and so use less
energy and other resources than conventional structures. Loughborough University is leading this innovative project, with funding from the Engineering and Physical Sciences Research Council (EPSRC). The initiative will include research in Namibia to...
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