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Tag: "polarized" at biology news

Surprising origin of cell's internal highways

...ransport proteins throughout the cell and generate polarized (directional) signal distribution that causes cells to move. While microtubules in some specialized cells can originate from non-centrosomal structures, the centrosome has been considered the main origination point for microtubule "nucleation" in...

Paper challenges 1491 Amazonian population theories

...990s drifted up to 10 million. "We've now got a polarized community," he says. At one end, he says, is Anna Roosevelt of the Field Museum in Chicago (she argues for large populations dispersed throughout Amazonia); at the other is Betty Meggers at Smithsonian (she argues these were very primitive people ...

The connector rotation hypothesis? Phage do not pack their DNA by rotation

...rs functioned, the researchers shone homogeneously polarized light on them and recorded the pattern of fluorescence produced in two channels at right angles to one other. If the connectors had been rotating, they would have seen a sine wave-like fluctuation in intensity in both channels with a phase shift o...

Ring-around-the-cell

... undergo a transformation called polarization. The polarized osteoclast sticks itself tightly to the bone, whil...t observation methods to samples of stripped-down, polarized osteoclasts: electron microscope imaging that allowed them to see fine details of the ring structure...

Squid skin reveals hidden messages

...nstantaneously--from predators. Squid also produce polarized skin patterns by regulating the iridescence of the...nel" visible only to animals that are sensitive to polarized light. In research published today in the journal Biology Letters, MBL (Marine Biological Laborato...

Light guides flight of migratory birds

...star patterns, the earth's magnetic field, and sky polarized light patterns. To avoid navigational errors as cu...he birds calibrate their magnetic compass based on polarized light patterns at sunset and sunrise. The research appears in the Aug. 11, 2006, issue of Science,...

FSU biologists uncover mechanisms that shape cells for better or worse

...on from the sense organs, and intestinal cells are polarized to take up nutrients and move them into the bloodstream," he said. Poulton explained that in order to ensure cell polarity in the Drosophila oocyte, the cells surrounding it activate a classic signaling pathway known as the Epidermal Growth Factor ...

New MRI technique shows emphysema in asymptomatic smokers

.... Dr. Fain believes that this new method of using polarized gases to study lung diseases will provide a clearer picture of the underlying mechanisms of poorly understood conditions like asthma and chronic pulmonary obstructive disease, leading to better treatments. ...

Rare Chinese frogs communicate by means of ultrasonic sound

...lectromagnetic sense in fishes and homing pigeons, polarized light vision in ants, chemical sensing of pheromones in insects and rodents, echolocation by ultrasound in bats and dolphins, are just a few examples. "That frogs can communicate with ultrasound adds to that list and represents a novel finding, beca...

Warming trend may contribute to malaria's rise

...etermine their relative importance. This is a very polarized field, in terms of supporting or not supporting the role of climate versus other factors. We don't want to contribute to the polarization, which I think is very unproductive in terms of the science. I hope we can move from this sort of debate into a ...

Locusts' built-in 'surface analysis' ability directs them to fly overland

... focused on the ability of the locusts to identify polarized light. This is a trait which is lacking in humans ...ashar, who is considered a leading world expert on polarized sight, working with two students, Shai Sabah and Noa Aharoni. The research was published in a recent...

New tool reveals secrets of migrating cells

...y fast speed inward toward the medulla, adopting a polarized shape characteristic of migrating cells." While Witt and Robey continue their two-photon imaging studies of thymus cells and lymph cells, Witt is trying to encourage the technology's use in biology generally. "Immunology is just one example of a su...

How monarch butterflies are wired for navigation

... monarch butterflies are known to use the angle of polarized sunlight as a celestial guide to help them keep to...the butterfly visual system known to specialize in polarized light detection. To confirm that the butterflies, indeed, required ultraviolet polarized light to na...

DNA Recombination and Repair—A New Twist to RecA Function

...l cases, coherent motion implies a coordinated and polarized use of energy. Now, Julia Cox, Oleg Tsodikov, and Michael Cox present evidence indicating that filaments of the bacterial RecA protein, long known for their role in homologous recombination and DNA repair, have properties reminiscent of a molecular ...

Vital step in cellular migration described by UCSD medical researchers

...d by researchers. In order to move, a cell must be polarized so that the molecular processes at the front end and back end are different, leading only to forward movement. One of the first steps in cell migration is the initiation of activity by Rac that extends protrusions out of the cell. These protrusions s...

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