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Tag: "stable" at biology news

Uniform tungsten trimers stand and deliver

...tform. "A scanning tunneling microscope must be so stable that we have to vibrationally isolate the instrument. It cannot move even a small amount because we are using a stream of electrons to measure the distance from the microscope's tip to a small space between atoms," White explained. The collaborators ...

UCSD researchers create roadmap to integrin activation

... a large family of adhesion molecules that promote stable interactions between cells and their environment. The integrins also act as cellular sensor and signaling molecules, transferring information between the inside and outside of a cell at plasma membrane sites. Platelets stop the body's bleeding by ...

Mayo Clinic: Gene expression profiling not quite perfected in predicting lung cancer prognosis

...vidence suggests that gene-based prediction is not stable and little is known about the prediction power of a gene expression profile as compared to well-known clinical and pathologic predictors," according to Ping Yang, M.D., Ph.D., the corresponding author of the study that appears in the November issue o...

Protein folding: Building a strong foundation

... Baylor College of Medicine suggests that the most stable parts of a protein are also the parts that fold fi...er to ascertain which of their parts were the most stable in the face of chemical and thermal fluctuations. "We found that the most stable parts of the fina...

Wild tigers need cat food

...ng and natural mortality, yet their numbers remain stable due to a combination of high reproductive rates and abundant prey. The study, which appears in the journal Ecology, underscores the need of maintaining protected areas with high prey densities in an overall tiger conservation strategy, along with an...

New dyslexia theory blames 'noise'

...rgued for many years, attention ... is crucial for stable learning of categories." Ziegler called for preventive training for children with weak speech perception in noise in kindergarten or early primary grades, saying they are at greater risk for developing dyslexia. He also cited a Northwestern U...

Vaccine for brain tumors shows promising results

...searchers observed that patients whose disease was stable after surgical resection and before vaccination were more likely to respond clinically. Of the first six patients treated, five have exceeded the historical median benchmark of 6.5 months survival from time of recurrence. All six have exceeded the ov...

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

...860 and 60% in 2002. While forest resources are stable or increasing in countries where per capita GDP exceeds US $4,600, the results in India and China (both of which fall short of this income level) show the importance and impact of government policies. In China, reforestation and afforestation effo...

Fantastic Voyage: A new nanoscale view of the biological world

... the Université Paris-Sud in France, labeling with stable isotopes and building quantitative image-analysis ...ioactive labelling. Instead, it is possible to use stable isotopes to track molecules. For example, researchers could track stem cells by labelling DNA with 1...

An AIDS-related virus tricks cells to become tumors, new Penn study finds

...on was blocked, the tumor suppressors again become stable suggesting a direct role of the viral protein in regulation of these major cell proteins," says lead author Erle Robertson, PhD, Professor of Microbiology and the Director of Tumor Virology at Penn's Abramson Cancer Center. Marked for Disposal The...

Tiny Tampa Bay fish key to evolution of immune system

...see, particularly those structural features at the stable core of this molecule, then we expect to design and produce more stable monoclonal antibodies for therapy," he said. Neil S. Greenspan, M.D., Ph.D., a professor of patholo...

Good times ahead for dinosaur hunters, according to U of Penn scientist's dinosaur census

...lso offers evidence that dinosaur populations were stable before the extinction event that ended their reign of global dominance. Dodson, however, warns that the picture of the fossil record at the time of extinction is not resolved enough to say definitively. "We have enough information to say for certai...

Comprehensive model is first to map protein folding at atomic level

...as some proteins take to assume their biologically stable configuration, and at least a thousand times longer than previous methods -- is described this week in the Proceedings of the National Academy of Sciences. "For years, a sizable army of scientists has been working toward better understanding how p...

New clues to how sex evolves

...orm's sex chromosome (the X chromosome) to achieve stable pairing, called synapsis. Now Dernburg and Phillips have found three new genes, which they have named zim-1, zim-2, and zim-3, that perform the same functions for the worm's five additional chromosomes. Their results are published in the December iss...

Cracking the egg

... sea squirt. Obviously early development is a very stable process and many of the crucial steps associated with it have remained the same along the vertebrate evolutionary pathway. But at the same time there's evidence of instability in other areas. According to Dr. Evsikov, "There's tantalizing evidence ...

Uncovering DNA's 'sweet' secret

...a number of similarities with DNA, it is much more stable than DNA. However, it has a more haphazard appeara...x-carbon sugars probably would not have produced a stable base-pairing system capable of carrying genetic information as efficiently as DNA. "The structure ...

Molecular motors and brakes work together in cells

...ors, working with fission yeast cells, showed that stable end-to-end arrays of microtubules can be achieved ...can make microtubule structures of defined lengths stable by coordinating the sliding of the motors and the slowing of the brakes." If microtubule-based st...

Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

... in areas occupied by cownose rays and examples of stable or growing shellfish populations in areas beyond the ray's northernmost limit. Ecosystem effects of increases in the other ray, skate, and smaller shark species are unknown, but like the cownose ray, may also be cascading down to species lower in ...

Satellites shed light on global warming

...n-B Ice Shelf, which researchers estimate had been stable since the last ice age 12 000 years ago. "This... Sea surface temperature (SST) is one of the most stable of several geographical variables which, when determined globally, helps diagnose the state of the E...

Ultrathin films deliver DNA as possible gene therapy tool

...ate layers of DNA with layers of a polymer that is stable when dry but that degrades when exposed to water. ...ctrostatic forces between the layers keep the film stable in dry, room-temperature conditions, the polymers break down easily in a wet biological environment ...

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