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Tag: "orientation" at biology news

Light guides flight of migratory birds

...ckwise or counterclockwise) deflection of homeward orientation when released at a distant site. It turned out, however, that the panels influenced the distribution of polarized light patterns at sunset and sunrise, and it was the altered polarization patterns, rather than olfactory cues, that produced the direct...

Stimulation of the semicircular canals can artificially control human walking and balance

... are part of the vestibular system that assists in orientation and balance. The researchers found that artificial stimulation of semiciruclar canal nerves afforded "remote control" that was accurate enough to keep subjects on pathways and avoiding obstacles while walking blindfolded through botanical gardens. Th...

Biological motors sort molecules one by one on a chip

...ernal electrical field is largely dependent on the orientation of the cylinder-shaped molecules. This was the first time that this orientation-dependency of the electrophoretic mobility was observed. In an accompanying Perspective article in Science, Professor Hess of the University of Florida wrote that the ...

Master planners in brain may coordinate other areas' roles in cognitive tasks

...n time to a rhythm. Another group had to judge the orientation of lines. A third group was asked to match short graphic squiggles. The non-linguistic tasks produced the same results, according to Petersen. Petersen and his colleagues plan follow-up studies to further understand the roles of the cingulate and th...

Most important actors in the growth process of neurons identified

...an sometimes be more than a meter long. The axon's orientation as it grows is also of great importance in forming...ated process in that it involves growth as well as orientation and recognition. So it's not surprising that many different genes are involved. To bring clarity to ...

Using dental X-rays to detect osteoporosis

...ickness, the amount of fragmentation, and the main orientation of the structure of the trabecular bone. In four clinical centers, 671 women with an average age of 55 years were recruited. To obtain the “gold standard? the team measured bone thickness at the femur, hip, and spine, using the technique that is c...

Homing pigeons get their bearings from their beaks

...x three-dimensional pattern with different spatial orientation designed to analyze the three components of the magnetic field vector separately. They react to the Earth’s external magnetic field in a very sensitive and specific manner, thus acting as a three-axis magnetometer. The study suggests that the bir...

Scientists discover stage at which an embryonic cell is fated to become a stem cell

...f the embryo. And those differences depend on the orientation and order of the very first cleavage divisions of the embryo. Professor Zernicka-Goetz said, "Our findings were surprising since they showed that cells of the mammalian embryo first start to differ from each other much earlier in development than p...

Action video games sharpen vision 20 percent

...st, which measured how well they could discern the orientation of a "T" within a crowd of other distracting symbols—a sort of electronic eye chart. Students were then divided into two groups. The experimental group played Unreal Tournament, a first-person shoot-'em-up action game, for roughly an hour a day. The ...

Scientists identify molecular cause for one form of deafness

...quid crystalline state, the bundles maintain their orientation order ?that is, they point roughly along the same direction ?but lose their positional order. These nematic liquid crystals are commonly used in watch displays and laptop displays. Wong and his colleagues also found that a mixture of mutant espin a...

Man's best friend lends insight into human evolution

...panzees utilize social cues like eye gaze and face orientation to monitor others' behavior or infer motives of other subordinate or dominant individuals, or even deceive them, when competing for food. But it turns out that chimps are not very good at drawing inferences about others' mental states in cooperative ...

Left-right wiring determined by neural communication in the embryonic worm

...o where language is generated in the brain, to the orientation of our internal organs, humans are a glut of asymmetries. Worms aren't so different: The roundworm Caenorhabditis elegans has nerves on its left and right sides that perform different functions. Like handedness, the determination of which nerves deve...

Surprising origin of cell's internal highways

...r the leading edge, of motile cells. Since such an orientation is needed for directional migration, Kaverina hypothesizes that this subset of microtubules may influence cell motility by facilitating the transport of proteins needed for movement to the cell front. "This new microtubule subset that we discover...

3-D ultrasound scanner provides in-depth view of the brain

... The brain imager also required them to shift the orientation of the ultrasound beam with respect to the probe, he said. Rather than capturing a side view, the brain probe "looks" straight ahead by emitting ultrasound waves like water from a hose. That way, it can produce an image of the brain with just the tip...

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