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Tag: "density" at biology news

Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect

...eawater full of CO2 droplets would have an average density smaller than that of surrounding seawater, creating conditions that could lead to a rapidly-rising plume. Problems also could occur if the injection device malfunctioned, producing larger droplets. "An even safer injection scheme would be to inject ...

Young scientists turn to gel to ease side-effects of cancer treatment

...mulation of various chemicals, is a gelatine whose density is comparable with human tissue and can be tailore...treatment of malignant tumours" Andrew Wilson. The density of the gel alters when subjected to radiation beams, so radiologists can use it to take the guesswor...

Seeing the forest and the trees

...plantations containing only species with high wood density such as teak resulted in a 75 percent increase in ...contrast, selectively logging trees with high wood density was found to reduce carbon storage by as much as 70 percent. Other scenarios, such as disease outbre...

How 'Dirt' Could Educate The Immune System And Help Treat Asthma

...in said. As sea-surface temperatures increase, the density of the water decreases and thus slows the ocean thermohaline circulation, so the ocean's ability to absorb carbon dioxide also decreases. This leaves more carbon dioxide in the atmosphere, exacerbating the problem. "At the same time, the reduced oce...

Climate change will affect carbon sequestration in oceans, model shows

...in said. As sea-surface temperatures increase, the density of the water decreases and thus slows the ocean thermohaline circulation, so the ocean's ability to absorb carbon dioxide also decreases. This leaves more carbon dioxide in the atmosphere, exacerbating the problem. "At the same time, the reduced oce...

A step toward the $1,000 personal genome using readily available lab equipment

...ched to one-micron beads, allowing for high signal density in a small area that is still large enough to be resolved through inexpensive optics. One of four fluorescent dyes corresponding to the four DNA bases binds at a specific location on the genetic sequence, depending on which DNA base is present. The f...

Nanotubes inspire new technique for healing broken bones

...mechanical strength, excellent flexibility and low density of carbon nanotubes make them ideal for the production of lightweight, high-strength materials such as bone," says Robert Haddon, Ph.D., a chemist at the University of California, Riverside, and lead author of the paper. Single-walled carbon nanotube...

Traditional models underestimate extinction rates

...ved extinction rates in the flea experiments. When density dependence was not included, extinction rates were greatly underestimated. Drake's results underscore the importance of bolstering extinction models with empirical validation--and of accounting for population density--to accurately evaluate risk and...

Fundamental discovery -- Bone fracture

... is bone mineral density." Measuring bone mineral density is valuable because it reveals how much bone a per...s left. The amount of an individual's bone mineral density peaks around age 30, then decreases for the rest of his or her life. By the time the person becomes ...

Woods Hole Research Center plans controlled burn in Amazon rainforest

...e reacting or recovering from the burn; and canopy density will be measured immediately after the fire and at monthly intervals, to monitor the impact of the fire and rate of recovery. Temperature and humidity will be monitored at multiple spots in each forest pre- and post- burn, to detect changes in the mi...

Motor transport in bio-nano systems

...ieuwenhuizen, and Reinhard Lipowsky Self-organized density patterns of molecular motors in arrays of cytoskeletal filaments Biophysical Journal 88, 3118-3132 (2005) Stefan Klumpp and Reinhard Lipowsky Phase transitions in systems with two species of molecular motors Europhysics Letters 66, 90-96 (2004) ...

Census of Marine Life explorers surprised by diversity, density of Arctic creatures

...'s most northern reaches has revealed a surprising density and diversity of Arctic Ocean creatures, some beli...r before been found in an ice environment. Animal density far higher than expected "Overall, the densities of animals are much higher than expected," says Ce...

Mice brains shrink during winter, impairing some learning and memory

...y smaller hippocampus, as well as changes in spine density there that have been associated with spatially related memory and learning performance. "We predicted that when you reduce the size of the hippocampus, it would have an impact on learning, and that's what we found," Nelson said. The shrinking of th...

Nature provides inspiration for important new adhesive

... in making softwood plywood, particleboard, medium density fiberboard, oriented strand board, and the laminated veneer lumber that is finding increasing use to replace conventional joists and beams in construction. Techniques have also been explored to create the new adhesives from tree bark or wood decayed...

Red delicious, Northern Spy apples have most antioxidants, chemists find

...cts could potentially lower "bad" cholesterol (low density lipoprotein, or LDL) by stimulating the production of LDL receptors in the liver, which help remove cholesterol from the blood. This mechanism is similar to that of statin drugs, researchers say. In March, these findings were presented at the ACS nat...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...y died at a zoo. Preliminary results reveal a high density of Pacinian corpuscles in the front of the foot and along the edges--a finding consistent with the notion that elephants are sensing seismic signals when they press their feet on the ground. O'Connell-Rodwell also is applying her insights in animal ...

To control germs, scientists deploy tiny agents provocateurs

...ned that bacteria sense each other and the overall density of their colony by continuously exchanging small m... a process known as quorum sensing. Past a certain density threshold, the colonies unite to initiate group behaviors, such as biofilm formation. Attempting to...

Nanoparticles offer new hope for detection and treatment

...rovide contrast in MRI images. This creates a high density of contrast agent, and when the particles bind to a specific area, that site glows brightly in MRI scans. In this study, MRI scans picked up tumors that were only a couple of millimeters (about one twenty-fifth of an inch) wide. Small, rapidly grow...

Increased risk of osteoporosis associated with gene that one in five people have

...e breakdown of estrogen and is associated with low density in the bones of the hip. The study will be report...t up a study to evaluate the relation between bone density and variations of the CYP1A1 gene." The researchers studied 156 women with an average age of 63.5 y...

Researchers devise way to mass-produce embryonic stem cells

...3-fold in 15 days. At the end of that period, cell density ?the number of cells that had grown in the bioreactor ?was anywhere from 10- to 100-fold higher than the number of stem cells produced by conventional laboratory methods. That's several hundreds of millions more stem cells. Mass-producing cells like...

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