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Tag: "density" at biology news

Salty oceans provide early warning for climate change

...rsity of Barcelona in Spain. Salt increases the density of water. Once a pocket of water becomes salty enough it sinks, drawing in additional water from surrounding areas, and initiates an ocean circulation loop called thermohaline overturning. The scientists discovered that a build up of salt in the w...

Study shows lizard moms dress their children for success

... population density." According to Sinervo, the density of the lizard population is probably a critical factor. At high densities, the aggressive orange-throated males are so busy fighting with other lizards that they are especially vulnerable to predators. As a result, the predators are likely to focus o...

New designer lipid-like peptide with lipid nanostructures for drug delivery systems

...line nanostructures. Moreover, the surface charge density of lipidic nanostructures can be varied in a simple manner. Dr. Anan Yaghmur, first author of the study, comments on the study, “the addition of small amounts of designer lipid-like peptides is sufficient to form systems with excellent potential ...

Pistachios lower cholesterol, provide antioxidants

...y 11.6 percent. The study also found that non-high density lipoproteins (non-HDL) decreased by 11.2 percent. Non-HDL levels are considered reliable predictors of cardiovascular disease risk. The three-ounce pistachio diet also decreased the ratios of total cholesterol to HDL, LDL to HDL and non-HDL to HD...

Catching cancer's spread by watching hemoglobin

...ion state around cancerous tissue and the size and density of blood vessels around the tumor can provide a lot of information about the progression of a tumor and its response to anti-cancer drugs. In the technique, two lasers at different wavelengths (colors) send ultra-short pulses (lasting only a femto...

Madagascan tropical forests return thanks to better management and well-defined ownership

...ows that the relationship between human population density and deforestation is much more complex than previo...station rates in an area with low human population density and large distance to markets, while the area with highest population density had stable forest cove...

Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems

...and acre contains 777 lizards. This difference in density persisted when the scientists controlled for location and environmental conditions. “The ecology of islands is particularly important because, while the world’s more than 100,000 islands constitute only 7 percent of the global land surface, they c...

Role of noise in neurons

...the cerebral cortex of the brain can have a wiring density of up to 4km per mm3 by using incredibly thin axons as wires, with an average diameter of 0.3 micrometers (1ìm is one millionth of a meter). Although, as in computer chips, this miniaturization economizes on space and energy, it increases the noise i...

'Short-circuit' found in ocean circulation

...on of rapid mixing across and rapid movement along density surfaces creates a 'short-circuit' in the overturning circulation, meaning it is more concentrated in this part of the Southern Ocean. The researchers made use of a unique signal - the spread of helium released naturally from the Earth’s interior...

Whiteflies and plant viruses can help each other to speed up biological invasion

...ng on plants infected by another virus. Population density of the B whitefly on virus-infected plants reached 2-13 times that on healthy plants in 56 days. No doubt increase of infectious whiteflies will in turn speed up virus pandemics. In contrast, the indigenous whitefly performed similarly on healthy and...

Tundra disappearing at rapid rate

...e Faculty of Science, reconstructed changes in the density and altitude of treeline forests in southwestern Y...es elevation—on warm, south-facing slopes and tree density increased significantly—as much as 65 per cent—on cooler, north-facing slopes. "The mechanism of...

How fish species suffer as a result of warmer waters

... between seasonal water temperature and population density using eelpout (Zoarces viviparus), a fish species from the Southern North Sea. The goal of the study was to identify those physiological processes exhibiting the most immediate response to warming in the field. Comparing ecological field data with la...

Researchers urge monitoring of bone health during chemotherapy

...one breakdown, and any therapy that decreases bone density could potentially enhance tumor growth in bone," s...eir cancer patient's bone health with regular bone density scans (DEXA) and prescribe medications to prevent bone loss when needed. And patients should consume...

Growth hormone is not the anti-aging bullet for healthy adults

...ivation, increase exercise capacity, increase bone density and (wink, wink) make wives and girlfriends happy. Despite these enticing claims, careful review of existing evidence does not support the prescription of GH for anti-aging purposes. Growth hormone is among the most expensive of all hormones us...

How genetic malfunction causes a form of retardation

...observed in the animals?brains increases in neuron density and percentage, as well as a large decrease in glial cells called astrocytes. “Little is known about how genetic perturbations lead to mental retardation,?wrote Miller and colleagues. “Here, we have identified a signaling protein, SHP-2, that play...

Scientists identify a candidate gene for osteoporosis

...hat a gene called DARC negatively regulates bone density in mice. The report appears online in Genome Rese...of Americans over the age of 50. Low bone mineral density (BMD)—the primary indicator of osteoporosis—is influenced by both genetic and environmental factors ...

NASA snow data helps maintain nation's largest, oldest bison herd

...ck model provides daily maps of snowpack depth and density throughout the Yellowstone landscape, in near-real time. It uses data from NASA's Landsat satellite to describe how the snowpack is influenced by patterns of vegetation, geothermal features, and wind. Daily measurements of precipitation and temperatu...

Nobel Laureate finds 'elegant' explanation for DNA transcribing enzyme's high fidelity

...t had never been noticed before?additional protein density beneath the matching nucleotide,?Kornberg said. The team traced that protein density back to a portion of the polymerase II enzyme: the trigger loop. “Of the 14 crystal structures now...

The effects of smoking on fractures and ligament injuries

...ek for two months. Researchers quantified cellular density at the site of injury and used Type I collagen gen...he results showed for the first time that cellular density in mice increased between 3 and 7 days after injury in normal wound healing, and that this was parti...

End of deforestation in view? Experts advance new way to size up global forest resources

... the "Forest Identity" considers both area and the density of trees per hectare to determine the volume of a ... a graph the shift from 1990 to 2005 in the forest density and area of 50 countries to reveal the change in their respective growing stock. Charting forest ...

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