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Tag: "volume" at biology news

UCLA Study Shows One-Third of Drug Ads in Medical Journals Do Not Contain References Supporting Medical Claims

...n screens the drug ads for validity, but the sheer volume makes it difficult to adequately check many of the ads. For example, in 2002, the FDA screened more than 34,000 ads. Journals included in the study: American Journal of Psychiatry, Annals of Emergency Medicine, Annals of Internal Medicine, Annals of...

“Nano-scissors?laser shows precise surgical capability

...area, delivering a lot of power to a tiny,specific volume without damaging surrounding tissue.?Once cut, the axons vaporized, and no other tissue was harmed.To assure the axons were actually cut, and their disappearance wasn’tcaused by discoloration by the laser, the researchers cut axons theyknew would imp...

Purdue proves concept of using nano-materials for drug discovery

...s pores smaller than 100 nanometers, and the total volume of the reactors varies from 1-10 nanoliters. "What's unique about this device is that the surface has nanometer-scale pores in it," Lee said. "The concept is fairly simple - there is an inorganic porous membrane - in this case alumina, which separat...

Why do insects stop 'breathing'? To avoid damage from too much oxygen, say researchers

...it continues to breathe in oxygen at the same high volume it uses while flying. The result is excess internal oxygen that can cause oxidative damage -- the destruction of biomaterial due to excess oxygen -- to tissues. To protect their bodies, insects like grasshoppers discontinue breathing. "We propose th...

Bird Brains Show How Trial and Error May Contribute to Learning

...ity would show up a few notes later as a change in volume or pitch at a particular time in the song. The variations are usually too subtle for human ears, Kao said, but sensitive recording equipment can detect them. The systematic trials were possible with the aid of a computer program that could track the...

Scientists find fossil proof of Egypt's ancient climate

... of the lake, enough to shrink it substantially in volume and make it more saline would have been expected to result in large excursions in d18O and minor element concentrations," Kieniewicz said. "However, throughout the stratigraphy, the d18O values of the silts remain isotopically light and the minor ele...

Vascular structure and function improve with diet and exercise

...to measure exercise capacity (VO2 max, the maximal volume of oxygen exchanged during exercise) at the beginning and end of the eight-week period. Average VO2 max increased from 32.1 milliliters per minute per kilogram (mL/min/kg) to 35.3 mL/min/kg. Average body weight decreased from 92.5 kg to 90.9 kg (203....

Discovery may lead to better Candidiasis drug

...rnal environments, which, in turn, regulates their volume and water content. Cells that lose their water content without being able to regulate its re-uptake die rapidly, Edgerton said. "Now that the target for histatin has been identified, we can design a better protein that will be even more effective in...

Duke engineers develop new 3-D cardiac imaging probe

...wed report on the work was published this month in volume 26 issue number 4 of the journal Ultrasonic Imagin...e the image is large enough to encompass the whole volume of the heart, fewer "pictures" need to be taken. This may shorten patient time in clinics, he said. ...

Turning viruses into allies against cancer

...ceived either a single injection of the virus, the volume depending on tumor size, or in later stages of the clinical trial, three injections separated by two to three weeks. Aside from evidence of tumor necrosis, the scientists detected expression of GM-CSF in injected tumors. "There were no obvious diff...

Advancements In Genomics Foster Deep Sea Discoveries

...pressure.?/p> The overwhelming majority of the volume of the planet where life exists, more than 75 percent, exists in the deep sea, while some 20 percent exists in the shallow water environment and a mere half of a percent is on land. Extreme deep ocean conditions include near freezing temperatures an...

Signs of aging: Scientists evaluate genes associated with longevity

...-expression changes. It is expected that the large volume of SAGE data generated for this study will also be utilized to more fully annotate the C. elegans transcriptome, resulting in a refined estimate of gene number and organization in this species. ...

Climatologists discover deep-sea secret

...s, the researchers have observed a decrease in the volume of freshwater sinking to the floor of the South Atlantic Ocean. According to Rainer Zahn, "although we don't know where global warming will take us, this could be a sign that the oceans are already adapting to the changes". ...

Self-assembled DNA buckyballs for drug delivery

...around 7 nm in diameter.) About 70 percent of the volume of the DNA buckyball is hollow, and the open spaces in the structure allow water to enter. Dan Luo, Cornell assistant professor of biological and environmental engineering in whose lab the DNA structures were made, suggests that drugs could be encaps...

Thinking the pain away? Study shows the brain's painkillers may cause 'placebo effect'

...nd placebo scans in their average pain ratings per volume of salt water infused -- in other words, the placebo effect was strong. The other five were classified as "low placebo responders." These subjective ratings are consistent with previous findings, Zubieta notes. But the simultaneous imaging of the pa...

Woods Hole Research Center plans controlled burn in Amazon rainforest

... more damaging than the first due to the increased volume of fuel available from those trees that perished in the first fire, and the fact that this fuel will be very dry. Center scientists are also curious to see how those trees that have resprouted from their roots will fare in this second fire, as their ...

Scientists devise way to measure RNA synthesis on the fly in a live cell

... concentration of RNA present inside the detection volume and a single living cell," said Thuc Le, a graduate student in Biochemistry & Molecular Biology and the lead author of the PNAS paper. This new technique will now facilitate research that may reveal how RNA molecules, like proteins, turn genes o...

Lance Armstrong through a physiological lens: hard training boosts muscle power 8%

...ivocal data, "we show here that the total training volume necessary to stimulate these metabolic adaptations is substantially lower than previously suggested." Nevertheless, they note: "We can only speculate on potential mechanisms responsible for the dramatic improvement in cycle endurance capacity, but i...

Chemical 'band-aid' prevents heart failure in mice with muscular dystrophy

...ravenous infusion of P188 in mdx mice restored the volume of the heart's main pumping chamber to the volume of normal mice ?a direct effect of P188's ability to restore normal elastic properties in individual...

'Sinkers' provide missing piece in deep-sea puzzle

...vacean houses and sinkers themselves. Knowing the volume of water that was observed during each midwater survey, Robison and coauthors Rob Sherlock and Kim Reisenbichler were able to estimate the overall abundance of sinkers in Monterey Bay. Over the ten-year period, they observed an average of about four ...

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