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Tag: "size" at biology news

New method shows it is possible to grow bone for grafts within a patient's body

...ed it slightly. When they had created a cavity the size and shape that they wanted, the researchers, Next, they removed the water and replaced it with a gel that is commercially available and approved by the FDA for delivery of cells within the human body. They chose the material because it contained calc...

Researchers find first evidence of venom system in extinct mammal

...of A Department of Biological Sciences. About the size of a mouse, the ancient mammal--Bisonalveus browni--may have resembled a small hedgehog or a small mole, but it isn't related to any animal that currently exists, said Craig Scott, a PhD student at the U of A and co-author of the paper in Nature. Cu...

When it comes to cell entry, being average has its advantages

When it comes to gaining entry into cells, size matters. A team from Brown University and the Max ...se in medication, say ?knowing an optimal particle size for entry is also helpful. "With nanotubes, we may be able to manufacture ones of a certain size to...

Motor transport in bio-nano systems

...lacement of about 10 nanometers, comparable to the size of its legs. In one second, the motor makes about 100 steps which leads to a velocity of about one micrometer per second. The absolute value of this velocity is not very impressive, but relative to its size, the motor molecule moves very fast: indeed...

First production of human monoclonal antibodies in chicken eggs published in Nature Biotechnology

...inserting DNA encoding proteins of essentially any size and complexity while achieving high levels of protein expression. Moreover, it is the only technology to date that restricts deposition of the therapeutic protein to egg white." "Monoclonal antibodies have demonstrated great success as human therape...

Breakthrough: Scientists create world's tiniest organic particles

...uticals and other compounds of unprecedented small size and uniformity. The tiny bits are so small they can be designed and constructed to measure only a hundred nanometers or so in diameter. A nanometer is a billionth of a meter. Leading the group is Dr. Joseph M. DeSimone, William R. Kenan Jr. Distingu...

Identification of specific genes predicts which patients will respond to Hepatitis C treatment

...genes on a glass slide ?these "gene chips" are the size of a postage stamp. The technology is able to quickly scan the expression of those genes and differentiate between genes which are "turned on" or "turned off". Comparing "genetic fingerprints" allows researchers to rapidly and effectively identify se...

Size matters: Preventing large mammal extinction

...mall domestic cat), is determined primarily by the size and locations of their distributions, and the huma... and extended gestation in mammals above a certain size means they are evolutionarily disadvantaged in the face of human impact, compared to species of smal...

Vietnam war technology could aid elephant conservation

...a National Park. Because of the differences in the size and frequency of animals' footfalls, the researche...accurate methods for monitoring and estimating the size of elephant populations or other large mammals in central Africa, as these populations are relativel...

Plankton can run, but can't hide from basking sharks

... metres long and weighing up to 7 tons - about the size of double-decker bus - the basking shark is the world's second largest fish and feeds by filtering plankton from sea water through its enormous mouth. It is able to filter up to 2,000 tons of water per hour - the equivalent of an Olympic-sized swimmi...

Siberian tigers hang tough

...stimate a minimum number of tigers, based on their size and distribution. Dale Miquelle, Director of the Wildlife Conservation Society's (WCS) Russia Program, and overall coordinator for the project, remarked, "This tiger survey represents a milestone in cooperative, international conservation efforts, w...

Divergent life history shapes gene expression in brains of salmon

...known as "sneakers" that mature at greatly reduced size without leaving freshwater. "The finding that hun...ed more, since these fish essentially trade bodily size for faster reproductive maturity," she says. "However, it was unexpected, for instance, that genes a...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...nd regional and global climate change. "Given the size of population in drylands, the number of people affected by desertification is likely larger than any other contemporary environmental problem," says the report. Occupying more than four-tenths (41%) of the world's land area, drylands are home to ov...

Space matters: Estimating species diversity in the fossil record

...as. After correcting for possible biases in sample size that might influence the number of species, Barnosky et al. found a strong species-area effect. These results, they argue, suggest that many fluctuations in diversity seen in fossil analyses actually arise from the species-area effect and are not ac...

Scientists focus on 'dwarf eye'

...d cornea, the eye's outermost layer, are of normal size and shape. "Eyes with nanophthalmos still work quite well, despite these complications," said Sundin. "But the disease's secondary complications later in life, including glaucoma or detached retina, are far more severe and can lead to complete blind...

Looks matter to female barn swallows

... kind to meticulously rule out biases such as age, size and initial variation in signals of male quality, like coloration, and to demonstrate that mate-selection decisions are continual and dynamic. The results of the study have implications for the evolution and upkeep of showy ornamental traits -- such ...

Beetle-inspired switch uses water for bonding

... close to a billionth of a meter and one-tenth the size of the beetle droplets, is within reach. Researchers could also create large effects from many tiny switches by connecting them in various arrangements, Steen said. "This new technology bridges the gap between scales as large as our hands and nanos...

Expanding forests darken the outlook for butterflies, study shows

...ibed burning of forests to increase the number and size of alpine meadows. However, unlike the park areas, the unprotected land areas are often used for commercial purposes and are therefore less likely to be allowed to burn. "They do prescribed burning in the national parks for general maintenance, but ...

Hide and seek: Researchers discover a new way for infectious bacteria to enter cells

...d observed that Listeria ?which is 20 times the size of the largest particle scientists believed a cell could take in by endocytosis ?could invade non-phagocytic cells. Other labs had made similar observations with other bacteria. Cossart and Veiga investigated the underlying machinery behind this unco...

Gene discovery sheds light on causes of rare disease, cancer

...d observed that Listeria ?which is 20 times the size of the largest particle scientists believed a cell could take in by endocytosis ?could invade non-phagocytic cells. Other labs had made similar observations with other bacteria. Cossart and Veiga investigated the underlying machinery behind this unco...

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