Quantcast

Latest Opsin Stories

2010-12-09 07:44:53

(Ivanhoe Newswire) -- Melanopsin, a light sensor that sets the circadian rhythm- the body's biological clock- also plays an important role in vision, according to this study.Melanopsin's messengers, called melanopsin-expressing retinal ganglion cells (mRGCs), forward information about the brightness of incoming light directly to visual centers in the brain.The results show a new role for mRGCs during image-forming vision, and suggest that these cells could make a significant contribution to...

8a5c1f9220a16301611e946a06c2c6f7
2010-12-08 10:26:17

Better known as the light sensor that sets the body's biological clock, melanopsin also plays an important role in vision: Via its messengers-so-called melanopsin-expressing retinal ganglion cells, or mRGCs-it forwards information about the brightness of incoming light directly to conventional visual centers in the brain, reports an international collaboration of scientists in this week's issue of PLoS Biology. The findings reveal a new role for mRGCs during image-forming vision and suggest...

bdf71b2fb6acfcb8d4364047ce258cff1
2010-03-11 15:35:45

By studying the hydra, a member of an ancient group of sea creatures that is still flourishing, scientists at UC Santa Barbara have made a discovery in understanding the origins of human vision. The finding is published in this week's issue of the Proceedings of the Royal Society B, a British journal of biology. Hydra are simple animals that, along with jellyfish, belong to the phylum cnidaria. Cnidarians first emerged 600 million years ago. "We determined which genetic 'gateway,' or ion...

2009-12-23 15:42:29

An international team of scientists has discovered how changes in both gene expression and gene sequence led to the diversity of visual systems in African cichlid fish. In research published in the December 21, 2009 issue of the journal PLoS Biology, Assistant Professor Karen Carleton, together with post-doctoral associate Chris Hofmann and graduate student Kelly O'Quin, in the University of Maryland Department of Biology, and collaborators Justin Marshall, University of Queensland; Tom...

2009-10-17 09:56:28

Emory University researchers have identified the first fish known to have switched from ultraviolet vision to violet vision, or the ability to see blue light. The discovery is also the first example of an animal deleting a molecule to change its visual spectrum. Their findings on scabbardfish, linking molecular evolution to functional changes and the possible environmental factors driving them, were published Oct. 13 in the Proceedings of the National Academy of Sciences. "This...

907041572abf2ca274809d59eb6170fb1
2009-09-17 06:35:00

Researchers from the University of Washington and the University of Florida have used gene therapy to cure two adult monkeys of color blindness, successfully restoring full color vision to the animals. Scientists had previously believed it was not possible to manipulate the adult brain in such a way, and that adding new sensory information, such as the visual receptors necessary for perfect color vision, could only be done during the earliest years of life, when the brain is at its most...

2009-07-28 08:43:42

The eyes of nocturnal bats possess two spectral cone photoreceptor types for daylight and colour vision. Reporting in the open-access, peer-reviewed journal PLoS ONE, scientists at the Max Planck Institute for Brain Research in Frankfurt and the University of Oldenburg have detected cones and their visual pigments in two flower-visiting species of bat. With electroretinographic recordings, they found an increased sensitivity to UV light in cone-stimulating light conditions. The researchers...

a1a2ab96e73c68328de13b02f2e3d5911
2009-07-27 06:35:00

Researchers from the John Hopkins School of Medicine have discovered a new type of cell used for vision in fish.The report, which appears in the journal Nature, explains how researchers found a retinal horizontal cell that senses light and contributes to vision."This is mind-boggling," says King-Wai Yau, Ph.D., a professor of neuroscience at John Hopkins."For more than 100 years, it's been known that rod cells and cone cells are responsible for sensing light, and therefore, vision," says Yau....

bc1ab35d245cb5f002839754710ced8c1
2009-01-30 12:36:59

New article in the FASEB Journal reports that scientists have finally captured the elusive signaling device our retinas use to tell us what we see Scientists have known for more than 200 years that vision begins with a series of chemical reactions when light strikes the retina, but the specific chemical processes have largely been a mystery. A team of researchers from the United States and Switzerland, have she new light on this process by "capturing" this chemical communication for future...

e91d4cf447891fa616feb2e147026a2e
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...


Word of the Day
grass-comber
  • A landsman who is making his first voyage at sea; a novice who enters naval service from rural life.
According to the OED, a grass-comber is also 'a sailor's term for one who has been a farm-labourer.'