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A rarely used unit of length in the U.S. system equal to five and a half feet.
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A linear unit of measurement equal to 161/2 feet.

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References in periodicals archive ?
Electrophysiological experiments demonstrate that rod cells are able to respond to single photons, Ref ([34], [18], [35]), even though 5- 7 photons per integration window are required for conscious response, Ref ([18], [17]).
Note the ciliated non-sensory cells (CN), microvillus (MV), and supporting cells (S) and rod cells (RD).
For the blind mice, Swaroop and other researchers would have to figure out how to make new rod cells. To do this, they took immature cells that were on their way to becoming photoreceptors from the eyes of young mice.
their eyes have many cone cells, relatively few rod cells
Deactivating either Nrl or Nr2e3 reprogrammed rod cells to become cone cells.
It takes practice to get better at using "averted vision" (looking slightly away from a target object so that its light falls on the outer parts of the retina where there are greater numbers of light-sensitive rod cells).
In the dark, only the "rod cells" around the outside of your retina are active and allow you to see in darkened conditions.
Muller cells harvested from human donor tissue were transplanted into the retinas of blind rats where they developed into rod cells which were responsive to light signals.
In the lab, the cells were transformed into rod cells that detected light in the retina, and injecting the rods into the backs of the eyes of completely blind rats partially restored their vision, the BBC reported.
Rhodopsin concentrates in the rod cells of the retina, which extend into the brain's visual centers.
The material houses 100,000 light detectors, similar to a retina's cone and rod cells; it's painstakingly assembled atom by atom inside a perfect vacuum, a place with zero matter, including basic elements found in air, like oxygen.
So researchers packaged the gene for a light-detecting pigment called rhodopsin, found in functional rod cells, inside a virus.