Tag: "rate" at biology news
Duke Researchers Discover Central Role Of Nitric Oxide In Hemoglobin Action
...ergy from oxygen, and the SNOmay help regulate the rate
at which the mitochondria respire, or use theoxygen." It is also possible that SNO regulates capillary blood flow,he said. When the hemoglobin has released both its oxygen and SNO, it can attractmolecules of carbon dioxide. Carbon dioxide (CO2) is...
Tumor Suppressor Gene Located In Liver Cancer Cells
... advanced at detection, and the five-year survival rate
in the United States is only 4 percent. A report on this tumor suppressor gene appears in the December issue of Nature Genetics. Along with principal investigator Randy Jirtle, Gerald R. Hankins and Mary K. Washington of Duke University Medical Cent...
Dating A Caveman
...sotopes (U-238, U-234 and Th-230), and knowing the rate
at which the transmutations occur, researchers can estimate the age of a rock. Basically, the higher the ratio of Th-230 to U-238, the older the limestone. To get these ratios, scientists previously measured the minute amounts of radioactivity emana...
Mutate Or Die: New Polymerase Gives Desperate Yeast An Option
...l a chance atlife at the cost of a higher mutation rate
for the organism. "Replicating past the damaged site is the leastfavored mechanism of dealing with DNA damage, but from the cell's perspective, it's better to replicate damaged DNA andsurvive than to not replicate and die," says Christopher Law...
Southern Pine Beetle Reaching Outbreak Levels In North Florida
... lay 160 eggs, allowinginfestations to spread at a rate
of up to 50 feet a day under the worstconditions, Meeker said. Florida has been laying the foundation for a pine beetle attack over thelast few decades, with planted acreage of loblolly pine twice what it was30 years ago and at a higher level than in...
Researchers Use Hydrated Lime To Reduce Toxic Selenium Emissions
...grees Celsius. "At 400 to 600 degrees Celsius, the rate
of capture shouldbe more than sufficient to effectively remove the selenium fromthe gas environment," Mahuli said. More work is needed to discover the best way to stabilize anddispose of fly ash and the lime sorbent, which will contain theselenium, F...
Water Recycling Project Tested in Turkey Plant
...enerator used in the unitcreates ozone at just the rate
needed. The process immediately uses up theozone s... allows the operator to turn the water at a higher rate
than mandatedminimums," Baldwin noted....
New Ultrasensitive Technique For Accurately Characterizing Biomolecules Is Developed By Cornell Chemists
...h of an inch (2.5 micrometers). The capillary flow rate
is about 1,000 times slower than is typical for el...eally is due to two things: slowing down the flow rate
and having one of the highest performing mass spectrometers in the world for protein analysis," said...
Major Plant Genome Research Project Underway
... to sequence the entire Arabidopsis genome, at a rate
of about 200 genes per month, and to develop the first complete gene sequence map of a higher plant. The three-year awards total approximately $12 million. Arabidopsis thaliana is a small plant in the mustard family, and has the smallest g...
Prostate Cancer May Be Predicted 10 Years Before Diagnosis
...ostate gland. Earlier studies have found that the rate
of increase in total PSA levels over several years is one of the best indicators of whether prostate cancer is present. Currently, most physicians test for total PSA only, which, when measured repeatedly over time, can predict prostate cancer up to ...
Selenium Supplements Can Reduce Cancer Rates
...e whether they could reduce the average recurrence rate
with selenium supplements. Ironically, 10 years later, the results were not significant for skin cancer. However, they were "compelling" for overall cancer incidence and mortality rates, Combs stressed. Of the selenium group, 69 developed some type...
Malnutrition Impacts Longevity Of Females More Than Males And Shows Gender Differences In Fruit Flies
Diet can change the rate
of aging in fruit flies, even reversing thenormal ...by the fact that the early-life surge in the death rate
is not seen in sterileprotein-deprived females. "It's likely that this is a particularly vulnerable...
A Drug Pump On A Computer Chip
...losed-loop implant that could monitor its own flow rate
to ensure a steady stream of medicine. The pu...ot as it passes by. From this measurement the flow rate
can be calculated. The device has been bench tested successfully and is being scaled down for m...
Pets Provide Physiological Benefits For Women Living Alone
...ir health. Participants' blood pressure and heart rate
were taken at home four times during the six months. A computerized monitor recorded cardiovascular measurements every five minutes for 40 minutes at each session. Researchers were not in the room, but pet-owners had their pets with them. ...
Prostate Cancer's Aggressiveness May Be Predicted Early By The Ratio Of Free To Total PSA
...nt, or cancer. Earlier studies have found that the rate
of increase in total PSA levels over time is one o...s still controversial," says Carter. "However, the rate
of detection of advanced, non-curable disease has markedly diminished among populations with high ra...
Purdue Study Aims To Boost MRI Capabilities
...less than a quarter-second each. The subjects then rate
each pulse zero through 10, with a rating of zero meaning it was not detectable and 10 meaning it was intolerable. "We ask the volunteers to ask themselves while rating each pulse whether they would find that level of stimulation uncomfortable over a...
Merging Physics And Neuroscience: First Evidence Of Self-Organized Criticality In Brain Networks
...ransmitter to the brain system increasesthe firing rate
and therefore the formation of calcium ion waves. "The noise is self-organizing," Jung explained. "It's likethe gasoline that keeps a car going. Even if you have a very nicecar, you still need the gasoline to get it going. The noise givesyou the ...
Calorie Restriction Reduces Age-Related Muscle Loss
...r team and others have shown that CR canreduce the rate
of skeletal muscle loss with age, but the exact mechanismshave been unclear," said Aiken. Some scientists theorize that CR may reduce sarcopenia byinfluencing mitochondria, cellular energy factories. A restricted diet maylower production of harmful ...
Resistance To Leptin Contributes To Obesity
.... For example, during ICV infusion, at a constant rate
of 8nanograms (ng) per hour, lean mice lost 15 per...ice, injecting leptin subcutaneouslyat an infusion rate
of 200 ng per hour, for example, led to an increase inblood levels, from 5 to 7 ng/milliliter, and r...
Single Mechanism Seen To Underlie Group Of Neurodegenerative Diseases: Mutant Proteins Form Insoluble Masses In The Nuclei Of Neurons
...iveyear, the institution posted the highest growth rate
in its research activity --9.1 percent -- of the top ten U.S. academic medical centers during the sameperiod. News releases from the University of Pennsylvania Medical Center areavailable to reporters by direct e-mail, fax, or U.S. mail, upon request...
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