directional

Vital step in cellular migration described by UCSD medical researchers

...on receptor with a protein called paxillin creates directional movement of a cell by inhibiting a protein called ...c. "Understanding how this protein contributes to directional movement of a cell provides a new insight into cell migration and ultimately could lead to therapeut...

Overbearing colored light may reveal a second mechanism by which birds interpret magnetic signals

...compass," which essentially allows birds to obtain directional information from the magnetic field by interpreting the angle of magnetic-field lines with regard to the horizon rather than by interpreting the magnetic field's polarity. Previous work by Dr. Ritz had suggested that in interpreting magnetic signals,...

Taking a flying jump

...ecific direction. Previous studies did not detect directional jumping1, but observations were made in conjunction with non-directional stimuli such as switching lights on and off. Card's results imply that there could be a simple neural solution that "answers" questions within what is essentially a reflex arc. ...

Out of sight, out of mind? Not necessarily

...uracy. "This high degree of accuracy for both the directional orientation and color tasks was significantly above chance," said Tony Ro, associate professor of psychology and principal investigator for the study. "Even though the human primary visual cortex activity was temporarily shut down, it's clear that d...

Displaced songbirds navigate in the high Arctic

... Island). The researchers then recorded the birds' directional orientation in cage experiments. The scientists found that both adult and juvenile birds abruptly shifted their orientation from the migratory direction to a direction leading back to the breeding area or the normal migratory route, suggesting that...

Researchers learn how blood vessel cells cope with their pressure-packed job

...ent of their length contained actin fibers with no directional orientation. However, as they increased the rhythmic stretching from 3 percent of a cell's length to 10 percent, stretch fibers became increasingly oriented perpendicular to the stretching direction. In the most significant finding in the PNAS arti...

Lethal needle blight epidemic may be related to climate change

...thors conclude that it is most likely related to a directional climate trend. The report of Woods et al. appears to represent one of a growing number of examples of an indirect effect of climate change, because increased summer precipitation would have been expected, absent D. septosporum, to benefit lodgepole p...

Mute swan population helps explain longstanding evolutionary question

... not evolving despite significant heritability and directional selection?" Many long-term studies of avian clutch size have looked for--but not seen-- an increase in the number of eggs laid. However, this 25-year study of the selection, inheritance, and evolution in the mute swan population of Abbotsbury, Engla...

ANU scientists crack DNA replication mystery

...nt question of how TUS stops the replisome in this directional manner. "When the replisome comes along from one direction, separation of the two DNA strands simply knocks the TUS off as you'd expect. But when it comes from the other direction, the strand separation near TUS leads to one of the DNA bases flipping...

First surveys of Tanzanian mountains reveal 160+ animal species, including new & endemic

...ephalophus natalensis). Using a tape recorder and directional microphone, researchers recorded the calls of two species of galagos. Galagos are small, nocturnal primates with large, round eyes commonly known as bushbabies. Some people believe "bush baby" refers to the animal's cries which can sound similar to t...

Light guides flight of migratory birds

Songbirds use multiple sources of directional cues to guide their seasonal migrations, including... how migratory birds integrate multiple sources of directional information into a coherent navigational system. Last autumn, Rachel Muheim, a postdoctoral associ...

Parasitic plants sniff out hosts

...n or red water. None of these objects elicited any directional growth. Then, to narrow down the possible cues be...seven compounds tested from tomato, three caused a directional growth response in dodder. One of these chemicals is also released by wheat, which might explain why...

New dyslexia theory blames 'noise'

...sible symptoms having to do with word recognition, directional ability and decoding of symbols). What is known is that dyslexia affects millions of children, with estimates of its incidence ranging from 5 to 15 percent. Sperling, who conducted her research as a doctoral student at USC, said the new findi...

University of Alberta researchers unravel intricate animal patterns

...neighbors. "For example, some species of birds use directional communication, and therefore, we may assume that in this case the behaviour of an individual will be influenced by the signals received from those con-specifics that face towards this individual," said Eftimie. "Based on these observations, we come u...

Baumann Lab defines proteins that distinguish chromosome ends from DNA double-strand breaks

...t to impede non-homologous end joining in a highly directional manner." It has long been understood that chromosome ends are distinct from DNA double-strand breaks and that the cellular machinery that repairs DNA breaks does not act on telomeres. But how repair factors are prevented from acting at chromosome ...

How to steer a moving cell

...k of the cell is what drives cell polarization and directional movement," said Klemke. "It is the steering wheel of the cell." Now the researchers want to determine how the large numbers of signaling molecules that make up the compass are functionally integrated to steer the cell under normal and pathological ...

New research shows sharks use their noses and bodies to locate smells

...mates, and home sites. However, odor itself has no directional properties, so animals must use a variety of senses to get the directional information for a smell," said Jelle Atema, professor of biology at Boston University and study co-a...

Surprising origin of cell's internal highways

...ile 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 discovered directly connects the G...