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Tag: "density" at biology news

Elephants, large mammals recover from poaching in Africa's oldest national park

...s rich park in Africa. It once boasted the highest density of large mammals in the world before a wave of unrest and poaching descended upon the region. Since the 1960s, the park's populations of elephants, hippos, and buffalos have declined dramatically, with the heaviest levels of poaching occurring in 198...

Sandia work launched on space shuttle shows live cells influence growth of nanostructures

...ilding the cells into a coating with a high enough density might elicit from them a defensive, multi-cellular signal of an unpleasant nature that discourages unwanted biofilm formation on the coated surface - important for avoiding infections that could be carried by implants and catheters. The cell's abil...

Matrilin-3 gene discovered to prevent onset of osteoarthritis

...e in early bone development, controls bone mineral density in adulthood and prevents osteoarthritis later in ... Later in life, those mice had higher bone mineral density (BMD) and higher rates of osteoarthritis. In people, BMD is a hallmark of certain forms of osteoarth...

Research identifies protein in mice that regulates bone formation

...sease characterized by a decrease in bone mass and density and which makes people more susceptible to bone fractures and deformities, afflicts some 10 million Americans over the age of 50. Researchers at the Harvard School of Public Health (HSPH) have discovered that eliminating a protein, Schnurri-3 (Shn3),...

In a technical tour de force, Salk scientists take a global view of the epigenome

...enome - about 120 million bases - on a single high density microarray," says Ecker. "To look at the entire human genome you would just need six more chips." Each microarray or DNA chip is dotted with 6 million short DNA fragments that span the Arabidopsis genome like floor tiles. The researchers first isol...

'Scent of a woman' tells male redback spiders to find a mate

... that males develop faster based on the population density of males and females around them -- the first time... facing in an environment -- they're aware of male density and the amount of competition they're going to be facing," says Michael Kasumovic, a PhD candidate i...

MIT researchers build tiny batteries with viruses

... done. The work is important, too, because energy density is a vital quality in batteries. A lack of energy density - meaning the amount of charge a battery of a given size can usefully carry - is what has hampered d...

New weapon in battle against osteoporosis

...ost 50 per cent." Signal molecules regulate bone density Together with a research group from Israel and England, Dr. Karsak was able to demonstrate that osteoclasts, as well as their opposite number, the osteoblasts, which are responsible for building bone, carry CB2 receptors on their surface. In this w...

One fish, two fish: New MIT sensor improves fish counts

...meters - displaying a fractal pattern. Population density patterns could be a means of communication, Makris said. His team observed "waves" of population density that spread quickly through a shoal. "We have a situation where information can be very rapidly tran...

Where 'jumping genes' fear to tread

...n 300 million years ago, do not have a significant density of transposons. Given the strong evolutionary conservation of the TFRs, Mattick's group hypothesized that they are regions of significant biological importance. Upon further characterizing the TFRs, they discovered that many (85%) overlapped at lea...

Uncovering sex-change secrets of black sea bass

...is hardly the only factor involved. Sex ratios and density also come into play. Berlinsky's team found that females were more likely to change sex when no males were present in the tank. Additionally, the fish were more likely to turn into males when kept in crowded tanks. Berlinsky is continuing his experi...

Exotic crab poised for widespread UK invasion

...xpand once the local population reaches a critical density and or conditions become favourable. "With most invasive species, such as the grey squirrel, the problem is not recognised until it is too late to do anything and you can not eliminate it without taking drastic environmental measures. "This study...

Potential heart benefit found in stem cells

... measure the left ventricle wall thickness and the density of the corresponding capillaries in four areas: t... in the border zones (11.2 vs. 8.6 mm). Capillary density in the border zones of the ADSC group was also significantly increased compared to the control group...

Georgia Tech accelerates drug discovery with new IBM supercomputing cluster

...able hosting environment to support the high power density supercomputing cluster. "With our hosting background, we had the flexibility and experience to quickly create a one-of-a-kind solution that could support Georgia Tech, IBM and the supercomputing cluster that will power the groundbreaking research of...

Ernst Mayr's theory illustrated in genetic epidemiology studies

...rol, the Apolipoprotein E (APOE) gene and the Low density lipoprotein receptor (LDLR) gene. Interestingly, it has been found that the protein products of these genes physically interact. Both play a role in high cholesterol that can lead to CAD, but in most human populations the APOE component is very rare...

Satellites show Amazon parks, indigenous reserves stop forest clearing

...ciety. There was no correlation between population density in indigenous areas and inhibition of deforestation. In much of the Amazon, not only can protecting nature be reconciled with human habitation ?it wouldn't happen without the people. Extensive intact forests on indigenous territories are central t...

Patterns in genome organization may partially explain how microbial cells work

...e amount of four basic building blocks of DNA, the density of genes and expression level of those genes, and other factors. To detect patterns in those features, they used wavelet analysis, a statistical technique used to identify patterns in geophysical data such as significant warming of the surface of th...

Antibacterial coatings cut infection rates

...e signalling molecules until they reach sufficient density as a group on the surface. The bacteria then change their metabolism and start producing a slimy biofilm that protects them from antibiotics. Sitting under the protective biofilm, the bacteria multiply and grow, and that's what causes infection," Pro...

Study finds that nutritionally enhanced rice reduces iron deficiency

...ngs and partners to increase the level of nutrient density in rice to be even more effective. "We view this study as a 'proof of concept,'" said Zeigler. "We now know that, if plants are bred with higher levels of iron and other micronutrients, they will improve the nutritional status of people who consum...

Cheap, rapid hand-held check for HIV

...low of current across the electrodes, allowing the density of CD4+ cells to be calculated. To check that on...sed a scale linking electrical resistance with the density of cells in the blood (Biosensors & Bioelectronics, vol 21, p 696). "It is the first step towar...

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