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Tag: "smaller" at biology news

Scientists fetch useful information from dog genome publications

...dimorphism seems to have evolved as females became smaller than males due to natural selection for optimal size," Lark explains. "This is consistent with our finding that a variant on the X chromosome plays a role in skeletal size determination." ...

New technique puts brain-imaging research on its head

... very motion with humans on a far milder, gentler, smaller scale and captured the movement inside the brain by magnetic resonance imaging (MRI). Philip Bayly, Ph.D., Lilyan and E. Lisle Hughes Professor in Engineering, Guy Genin, Ph.D., assistant professor of mechanical engineering, and Eric Leuthardt, MD, ...

Plants, too, have ways to manage freeloaders

... strains grew larger, while other strains produced smaller plants. For the main experiment, Simms concentrat...plants such as soybeans have been shown to produce smaller nodules when their bacteria were deprived of atmospheric nitrogen, which prevented them from sharing...

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

... well as animals in the area; two years earlier, a smaller release of CO2 from Lake Monoun in the same countr...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. Pr...

OHSU discovery sheds light into how stem cells become brain cells

.... This resulted in the development of embryos with smaller brains containing neurons but virtually no glial cells. When they isolated neural stem cells, placed them into cell culture and then removed Brg1, the cells in the culture turned into neurons but failed to differentiate into glia. "This research sh...

WWF peeks into mysterious life of Borneo's pygmy elephants

... herd of 30-50 elephants but often splits off into smaller groups for days or weeks at a time. The home ranges of Nancy and Taliwas, who were collared in nearby forests, overlap, suggesting that the two elephants' groups may be related. Since elephants live in matriarchal societies, WWF collared only adult f...

Cord blood cells may widen treatment window for stroke

...ets the recommended three-hour treatment criteria, smaller hospitals often lack ready access to a CT scan, a test needed to rule out a hemorrhagic stroke caused by a burst blood vessel. The drug can worsen this less common type of stroke. "New and more flexible treatments are needed to help more patients," ...

Do the Europeans turn ill sitting up so late?

... involved in sleep research, but especially in the smaller countries it is very difficult to acquire the funding. This sleep restriction project brings together researchers from five countries, thus creating an efficient network where the special skills of each partner can be utilized. The network will prov...

Implantable pumps extend lives of patients too sick for transplant

...at numerous pump designs are being tested that are smaller and lighter. Durability will also be an issue, he said, since replacing an LVAD entails just as substantial and involved a surgical procedure as the initial placement. Duke is currently participating in a number of different trials testing different...

Womb needed for proper brain development

... of the front part of the brain were significantly smaller than those of babies who were born at or near full-term. Dr. Witelson said the findings indicate further research is needed to try to understand what mechanisms in utero are missing after birth that are essential for the normal process of neuro deve...

Older female fish prefer imperfect male mates, study finds

...emale spent with each animation. While younger and smaller females still showed a preference for the symmetrical male, older and larger females increasingly preferred the asymmetrical male. In previous research conducted elsewhere, females were shown to prefer symmetrical over asymmetrical males when presen...

New study expands understanding of the role of RNA editing in gene control

...had been edited in the earlier step, snipping into smaller bits the now useless precursor miRNA molecule precisely at the inosine site resulting from the earlier editing. Taken together, the results of the study suggest that regulation of the genome is considerably more sophisticated than had been previousl...

DNA self-assembly used to mass-produce patterned nanostructures

...electronic or optical circuits at a scale 10 times smaller than the smallest circuits now being manufactured....es -- with patterns we specify -- at least tenfold smaller than the best lithography being used right now," LaBean said. "Plus, because we're using DNA buildin...

MIT researcher finds neuron growth in adult brain

...matic 90 microns. "The scale of change is much smaller than what goes on during the critical period of development, but the fact that it goes on at all is earth-shattering," Nedivi said. She believes the results will force a change in the way researchers think about how the adult brain is hard-wired. N...

University of Delaware researchers develop cancer 'nanobomb'

...otubes as drug delivery vehicles. Because they are smaller than the size of a single cell, the nanotubes can provide for the highly selective injection of drugs into individual cells. As they undertook various experiments, however, the team made a startling discovery. "When you put the atoms in different ...

NJIT study shows nanoparticles could damage plant life

...slowing the growth of the roots," said Watts. "The smaller the particle, the larger is the total amount of surface area per unit weight. So the smaller you make the particles, the larger is the surface area, which we suspect is what contributes to the ...

'Nanospheres' that block pain of sensitive teeth

...h pH levels the particles of hydroxyapatite become smaller and more rounded, better for fitting inside the tiny channels in teeth. To see whether nanospheres would be successful at filling the channels they used commercially available silica nanospheres of around 40nm in diameter. Earl said: "We found the...

A new link between stem cells and tumors

.... Cell division creates one large neuroblast and a smaller cell that can become part of a nerve. This process is controlled by events that happen prior to division. The parent cell becomes asymmetrical: it collects a set of special molecules, including Prospero and other proteins, in the area that will bud o...

'Smart' nanoprobes light up disease

... have developed a "smart" beacon hundreds of times smaller than a human cell that is programmed to light up only when activated by specific proteases. Altered expression of particular proteases is a common hallmark of cancer, atherosclerosis, and many other diseases. In the September issue of the journal Bi...

Researchers find gland that tells fruit flies when to stop growing

...asing insulin signaling triggered metamorphosis at smaller sizes than usual. Suppressing the gland's growth b...ands reached critical weight earlier and at a much smaller size than normal larvae. But she also found that flies with enlarged glands reached that critical we...

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