Tag: "diffusion" at biology news
New survey documents the headaches of computerized medicine
... be worse than the disease likely are impeding the diffusion
of CPOE throughout hospitals in the United States, the authors of the JAMIA paper asserted. Those fears gained credence when a pediatrics hospital in Pittsburgh attributed a higher mortality rate to its CPOE systemmistakenly, it later turned outand w...
Nanotechnology helps scientists make bendy sensors for hydrogen vehicles
... the pipe can detect any hydrogen leakage prior to diffusion
to alert control units to take action. Flexible hydrogen sensors show a change of 75 percent in their resistance when exposed to hydrogen at a concentration of 0.05 percent in air. The devices can detect the presence of 1 percent hydrogen at room t...
Work with nanoparticles may lead to 'on-the-spot' virus detector
... elusive. Typical procedures involve using passive diffusion
to get the viral particles to bind to an antibody,...at a very low concentration and relying on passive diffusion
to deposit the viral particles onto the detection surface can be time-consuming." The researchers wa...
Asymmetry due to perfect balance
...h an asymmetric distribution of membrane proteins, diffusion
has to be countered for a long enough time to allo...directed transport whose net effects need to outdo diffusion
till the necessary concentration of molecules is reached. "We wanted to know which principles allow ...
AGU Journal Highlights -- April 16, 2007
...ty field changes, possibly induced by simultaneous diffusion
of mantle water while post-seismic slip occurs. They expect that such a self-healing system of earthquake-induced gravity changes, which introduces a new role of water in the mantle, would significantly reduce the amount of permanent shifts of the Ea...
New imaging method shows whether treatment for advanced prostate cancer is working
...ead to the bones. The technique involves measuring diffusion
of water within tumors. "Currently, we have no ...arch. The imaging technique, called a functional diffusion
map, uses a magnetic resonance imaging scan and special software to track the diffusion, or movement...
Natural anti-freeze -- how arthropods survive the cold
...is means that water is lost from the body across a diffusion
gradient between the animals super-cooled body fluids and ice in the surroundings. "During this process the body loses all its water and you end up with a normal looking head, and a body which looks like a crumpled up crisp packet when it is fully de...
Counting heads or measuring space?
...aving to pay for their production. The approach of diffusion
sensing is slightly simpler: it is assumed that th...e a mixture of cell density, cell distribution and diffusion
limitation due to spatial conditions, because these aspects cannot be strictly separated it depends...
Protein's tail may be flu virus's achilles heel
...ystals. The method used was the hanging drop vapor diffusion
method, which involves suspending a liquid droplet of concentrated protein solution on the underside of a glass slide that is sealed inside a jar. As the liquid in the droplets evaporates, the proteins become supersaturated, and in some cases they fo...
Freshwater snails are surprisingly fast-moving invaders
...erogeneous and patchy. The classical deterministic diffusion
paradigm fails to incorporate this feature and ignores the random nature of long-distance colonization events. Taking the snails into account, Facon and Patrice David (Centre dEcologie Fonctionnelle et Evolutive, CNRS) have created a new method fo...
Control mechanism for biological pattern formation decoded
...cal considerations, Turing proposed a reaction and diffusion
mechanism between two chemical substances. Using m...at the inhibitor can be distributed faster through diffusion
than the activator, thereby stabilizing the irregular distribution. This kind of dynamic could deter...
What does the public really know about HPV?
...nitor this possible increase. We plan to track the diffusion
of knowledge to make sure that all women have accurate knowledge about HPV and how to prevent cervical cancer." The Effects of Information Framing on Intentions to Vaccinate Against HPV The success of the HPV vaccine depends largely on the public...
Life in the extreme
...ters in size, where fluid is released through slow diffusion
from the sea floor. Mud volcanoes which are active areas of fluid seepage, are other extreme environments discovered in the 1990s. These harsh conditions give rise to some of the most extreme and scientifically challenging environments for life to ex...
Risk in social science
...d we know that political pressures can prevent the diffusion
of new technologies, despite a lack of scientific evidence,' they say. The book looks at the topic of risk from many different angles, with chapters on Crime, the Environment and Technical Development, Everyday Life and Leisure Time, Family and Par...
Computing catches up with theory
...'t need to specifically calculate concentration or diffusion
of the activa-tion factor. Yet it produces remarkably true-to-life results. In the next few years, the team will refine the model by incorporating molecular and sub-cellular details while enhancing the representation of fluid dynamics and interactio...
Carnegie Mellon uses new imaging technique to discover differences in brains of people with autism
...URGH -- Using a new form of brain imaging known as diffusion
tensor imaging (DTI), researchers in the Center for Cognitive Brain Imaging at Carnegie Mellon University have discovered that the so-called white matter in the brains of people with autism has lower structural integrity than in the brains of normal ...
Remarkable physiology allows crucian carp to survive months without oxygen
...cally when the ice and snow cover them, preventing diffusion
of oxygen from the air and cutting off aquatic plants from the light needed for photosynthesis, Paajanen said. The ponds in Finland gradually lose oxygen following the summer, and from February to April the ponds have virtually no oxygen. Members o...
Other highlights in the August 16 JNCI
...ule anti-cancer compounds. He writes, "Unless the diffusion
and drug transport properties of an agent are optimized, what looks good in tissue culture experiments will likely look less promising when applied to the human milieu." Contacts: Article: Kevin Hicks email@example.com Editorial: Karen...
Ocean microbe census discovers diverse world of rare bacteria
...r low abundance at other sites is a consequence of diffusion
and dispersal. However we believe they must have some importance to the marine ecosystem and can theorize a couple of possible roles." One is that they are keystone life forms micro organisms that exist in low numbers but have some important funct...
Figuring out function from bacteria's bewildering forms
...models assume the bacteria encounter nutrients via diffusion
from their surrounding medium. "Our report makes the point that in calm aquatic environments where there is no mixing of the liquid and therefore the motion of nutrient molecules is dominated by diffusion, it is the cell's length that is the most ...