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Latest Photoreceptor cells Stories

2009-06-26 09:44:11

Research lead by Dr. Nicolas Bazan, Boyd Professor and Director of the Neuroscience Center of Excellence at LSU Health Sciences Center New Orleans, identifying an enzyme that makes neuroprotectin D1 which specifically and selectively protects retinal cells key for vision, will be published in the June 26, 2009 issue of the Journal of Biological Chemistry.Dr. Bazan's research team previously discovered neuroprotectin D1 (NPD1), a naturally produced chemical messenger that protects cells from...

2009-04-17 11:25:08

The eyes of nocturnal mammals have very large numbers of highly-sensitive rod photoreceptors (the cell type responsible for night vision). They have to perceive light which is less than a millionth of the intensity of daylight. An international team headed by LMU researchers Dr. Boris Joffe, Dr. Irina Solovei and Professor Thomas Cremer has now succeeded in demonstrating that a nocturnal lifestyle and the challenges posed by it have a dramatic effect on the organisation of the nuclei of rod...

2009-04-16 15:22:05

German-led scientists say they have discovered an important element of DNA that creates good night vision in nocturnal mammals. Ludwig-Maximilians University researchers in Munich said they discovered the DNA within the photoreceptor rod cells responsible for low light vision turns the rod cell nuclei themselves into tiny light-collecting lenses, with millions of them in every nocturnal eye. The conventional architecture seen in almost all nuclei is invariably present in the rod cells of...

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2009-03-25 09:16:54

Among zebrafish, the eyes have it. Inside them is a mosaic of light-sensitive cells whose structure and functions are nearly identical to those of humans. There, biologists at The Florida State University discovered a gene mutation that determines if the cells develop as rods (the photoreceptors responsible for dim-light vision) or as cones (the photoreceptors needed for color vision). Described in a paper published in the Proceedings of the National Academy of Sciences (PNAS), the landmark...

2009-03-10 14:12:50

U.S. medical scientists say they've identified a protein that regulates how light-sensing nerve cells form in the retina during the eye's development. Researchers at Johns Hopkins University School of Medicine and Washington University School of Medicine said their findings could help scientists better understand how the body's nerve cells develop. We've found a protein that seems to serve as a general switch for photoreceptor cell development, said Johns Hopkins Assistant Professor Seth...

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2009-02-26 10:17:03

New Technique May Spot Evidence of Macular Degeneration Years Earlier A layer of "dark cells" in the retina that is responsible for maintaining the health of the light-sensing cells in our eyes has been imaged in a living retina for the first time. The ability to see this nearly invisible layer could help doctors identify the onset of many diseases of the eye long before a patient notices symptoms. The findings are reported today's issue of Investigative Ophthalmology and Visual Science. "Our...

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2009-01-01 10:25:09

A team of Johns Hopkins neuroscientists has worked out how some newly discovered light sensors in the eye detect light and communicate with the brain. The report appears online this week in Nature. These light sensors are a small number of nerve cells in the retina that contain melanopsin molecules. Unlike conventional light-sensing cells in the retina"”rods and cones"”melanopsin-containing cells are not used for seeing images; instead, they monitor light levels to adjust the...

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2008-11-20 10:51:42

Researchers unravel how the very first eyes in evolution might have worked and how they guide the swimming of marine plankton towards light Larvae of marine invertebrates "“ worms, sponges, jellyfish - have the simplest eyes that exist. They consist of no more than two cells: a photoreceptor cell and a pigment cell. These minimal eyes, called eyespots, resemble the 'proto-eyes' suggested by Charles Darwin as the first eyes to appear in animal evolution. They cannot form images but allow...

2008-08-22 17:11:34

The Olympic athletes have been parading around like fashionistas in an array of colorful outfits, and we, their adoring public, can't resist commenting on the style and color of their high-end athletic wear. My favorite was the faux silk, faux embroidered, slinky red leotards of the Chinese women's gymnasts. Apparently, as researchers have recently discovered, the choice of red for those leotards might also have given the Chinese gymnasts an advantage. But why is the color red so...

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2006-10-06 08:30:00

Not so long ago, before electric lights, farmers relied on moonlight to harvest autumn crops. With everything ripening at once, there was too much work to to do to stop at sundown. A bright full moon -- a "Harvest Moon" -- allowed work to continue into the night. The moonlight was welcome, but as any farmer could tell you, it was strange stuff. How so? See for yourself. The Harvest Moon of 2006 rises on October 6th, and if you pay attention, you may notice a few puzzling things: 1. Moonlight...


Word of the Day
out-herod
  • In the phrase to out-herod Herod, to be more violent than Herod (as represented in the old mystery plays); hence, to exceed in any excess of evil.
Herod refers to 'Herod the Great,' a Roman client king and 'a madman who murdered his own family and a great many rabbis.' According to the OED, the term is 'chiefly with allusion to Shakespeare's use' in Hamlet.
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