Tag: "less" at biology news

Certain genes boost fish oils' protection against breast cancer

... fish such as salmon and mackerel) were 34 percent less likely to be diagnosed with breast cancer than women who ate the least n-3 fatty acids from fish. They suspected that lipid peroxidation products-that is, substances produced when the fatty acids break down-were behind the protection. Gago-Dominguez...

Binocular rivalry: Fulfilling visual expectations

...l in the opposite, "feedback," direction, but much less is known about the function of these signals. A recent study by graduate students Tamara Watson and Joel Pearson and their supervisor Dr. Colin Clifford at the University of Sydney suggests that these feedback signals carry information about what we ...

Genes expose secrets of sex on the side

... Worldwide, the DNA from the Y chromosome has much less genetic variability than does mitochondrial DNA. ...eficial mutation as the reason Y-chromosome DNA is less variable than mitochondrial DNA. "Because we don't think the pattern we see was caused by an...

USC study links historical increases in life span to lower childhood exposure to infection

...archers found that as public health efforts led to less exposure to infectious diseases during childhood, people started living longer and better. "Most people have been looking for an explanation for health change among the old in current conditions," Crimmins said. "We're saying that part of the r...

New way to protect brain from stroke damage

... lacking the ASIC1a gene also showed significantly less ischemic brain injury. Scientists had long considered another class of cellular components, NMDA receptors, as the main target responsible for calcium overload in the ischemic brain, according to the researchers. "However, recent clinical efforts to ...

Washington University in St. Louis leads group studying aging process

...d where the oxygen level of the biosphere was much less than it is today. Over its very long life span, cyanobacteria has evolved a system to survive a gradually increasing oxidizing environment, which is why Pakrasi and his group want to study the organism so closely. "The basic goal of the project is t...

Human chromosome 5 final sequence analysis released to public

...likely to have either killed the animal or made it less able to reproduce, preventing the mutation from ma...eople with the same deletion can have much more or less severe forms of the disease. It turns out that the region contains many duplications and other rearr...

Simian virus 40 not associated with non-Hodgkin lymphoma, study shows

...es BK and JC, they found SV40-specific antibody in less than 2% of both case patients and control subjects. The researchers thus found no association between SV40 exposure or infection and an increased risk of NHL. "Based on the assumption that SV40 infection would have resulted in a measurable immune res...

IBD (Crohn's, Colitis) 'joins' cancer, inflammatory diseases in associated blood vessel growth

...es, migration was primarily dependent on IL-8, and less on bFGF or VEGF. Finally, IBD-derived extracts induced a potent angiogenic response in the corneal assay compared to control-derived extracts, they noted. Conclusion The results provide "morphological and functional evidence of strong pro-angiogeni...

There and back again

...ts or rolled tubes, while mesenchymal cells appear less coordinated in their structure-forming activities and form fewer and looser connections with other cells. These tissue-level differences are reflected at the level of the individual cell as well. Under the microscope, mesenchymal cells are amorphous ...

Lecture on ecology of infectious diseases

...rie dog colonies in urban settings were no more or less likely to experience a plague outbreak than such colonies in more rural settings. Significantly, plague outbreaks tended not to occur in colonies that were surrounded by roads, streams or lakes, suggesting that these landscape features may alter the...

Two Virginia Tech energy-related inventions win R&D 100 awards

... will provide a much longer service life and weigh less than batteries. "An early adopter will likely be the military, which is looking at 20 kW backpacks to power communication devices," says McGrath. "You can replace 20 pounds of batteries with five pounds of fuel cells." Most PEM fuel cells now use...

Missing genes may help explain why plague bacteria are so deadly

...ent epidemic (pathogen) can suddenly emerge from a less virulent, closely related progenitor." "This work is seminal because it has enabled us for the first time to follow the precise molecular events that led to the emergence of this highly virulent bacterium," said LLNL biologist Emilio Garcia, who hea...

Hunting illusive signs of natural selection

...ly selected out of the population because they are less fit. Other mutations accidentally provide a change that makes individuals more fit for their environment and gives them an advantage. These individuals are more fit and reproduce more, increasing the prevalence of that particular trait in the popul...

Sandia experiments may reduce possibility of future water wars

...t (dry weight) of livestock forage, and do this on less than 1,000 acres instead of 260,000 acres - the cu... traditionally grown in open fields), but with far less water use. The hydroponic greenhouse, also known as "protected agriculture" or "controlled-envir...

Viral suspect for amphibian decline traced to human spread through bait

...atterns that the viruses have been moved around in less than traditional ways probably in anthropogenic ways," said Collins. "Bait is one of the ways it is probably getting around. "We found evidence for this specific virus in salamanders in bait stores in Phoenix and also evidence of it in axolotls (sa...

Screen siblings, parents of infants with severe heart abnormalities

... the left side of the heart should be screened for less severe, but related, heart problems, said researchers at Baylor College of Medicine (BCM) in Houston. In a new study in the September issue of the journal Pediatrics, Drs. Jeffrey Towbin, BCM professor of pediatrics at BCM, and John Belmo...

Extreme stretch-growth of axons

...crons and have been stretched to 10 centimeters in less than two weeks. Smith and colleagues report their findings in the cover story of the September 8, 2004 issue of the Journal of Neuroscience. "This type of stretch growth of axons is really a new perspective," says Smith. Despite the extreme growth in...

Fossils reveal direct link between global warming and genetic diversity in wildlife

...covered from the Medieval Warm Period, which ended less than 1,000 years ago. That means gophers are not getting any fresh, new genes from somewhere outside because they're isolated." While previous studies have shown that interbreeding usually occurs among large populations of animals, "this study shows ...

Mitochondrial genes cause nuclear mischief

...bservations, they found that these NUMTs were much less likely to be found in non-coding "junk" DNA and much more likely to insert themselves within highly active genes. Such insertions can cause disease, as shown by the recent discovery of a hemophilia patient with a NUMT interrupting his clotting facto...

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