Navigation Links
Computer models help decode cells that sense light without seeing
Date:2/7/2014

psin."

For a long time, it was assumed that the human retina contained only photoreceptor cells specialized in dim-light and daylight vision, according to Olivucci. However, recent studies revealed the existence of a small number of intrinsically photosensitive nervous cells that regulate non-visual light responses. These cells contain a rhodopsin-like protein named melanopsin, which plays a role in the regulation of unconscious visual reflexes and in the synchronization of the body's responses to the dawn/dusk cycle, known as circadian rhythms or the "body clock," through a process known as photoentrainment.

The fact that the melanopsin density in the vertebrate retina is 10,000 times lower than that of rhodopsin density, and that, with respect to the visual photoreceptors, the melanopsin-containing cells capture a million-fold fewer photons, suggests that melanopsin may be more sensitive than rhodopsin. The comprehension of the mechanism that makes this extreme light sensitivity possible appears to be a prerequisite to the development of new technologies.

Both rhodopsin and melanopsin are proteins containing a derivative of vitamin A, which serves as an "antenna" for photon detection. When a photon is detected, the proteins are set in an activated state, through a photochemical transformation, which ultimately results in a signal being sent to the brain. Thus, at the molecular level, visual sensitivity is the result of a trade-off between two factors: light activation and thermal noise. It is currently thought that light-activation efficiency (i.e., the number of activation events relative to the total number of detected photons) may be related to its underlying speed of chemical transformation. On the other hand, the thermal noise depends on the number of activation events triggered by ambient body heat in the absence of photon detection.

"Understanding the mechanism that determines this seemingly amazing light sensitivity of m
'/>"/>

Contact: Mr. Jamie Abel
jabel@oh-tech.org
614-292-6495
Ohio Supercomputer Center
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Supercomputers join search for cheapium
2. 25 years of DNA on the computer
3. UT Dallas computer scientists create 3-D technique
4. Rensselaer researchers create accurate computer model of RNA tetraloop
5. Computer model predicts red blood cell flow
6. Computational biology: Cells reprogrammed on the computer
7. Computer can infer rules of the forest
8. Emerging importance of computerized cognitive testing -- new therapies for dementia
9. Solving DNA puzzles is overwhelming computer systems, researchers warn
10. Daydreaming simulated by computer model
11. Computer modeling technique goes viral at Brandeis
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Computer models help decode cells that sense light without seeing
(Date:8/1/2014)... and transgender individuals who want to conceive a child ... heterosexual and cisgendered peers, such as reduced fertility, but ... legal challenges to become parents. A comprehensive review of ... presented in the article " LGBT Assisted Reproduction: Current ... LGBT Health , a peer-reviewed journal from Mary ...
(Date:8/1/2014)... of marine mammals have officially named a species ... Sousa sahulensis , according to the Wildlife Conservation ... describing the newly named species is the culmination ... available historical records, physical descriptions, and genetic data ... ranging from the coast of West Africa to ...
(Date:8/1/2014)... Understanding eye diseases is tricky enough. Knowing what causes ... , Now, University of Iowa researchers have created the ... the human eye long associated with blinding diseases, such ... thousands of proteins in the choroid, which supplies blood ... vision. By seeing differences in the abundance of proteins ...
Breaking Biology News(10 mins):Advances in assisted reproduction create more options & new legal issues for LGBT couples 2Scientists name new species of cetacean: The Australian humpback dolphin 2Scientists name new species of cetacean: The Australian humpback dolphin 3A map for eye disease 2
... been debated in philosophical circles, and more recently, evolutionary ... of natural selection, altruism may have evolved because any ... and reproduction increases the chance of an individual,s DNA ... altruism are well known in the animal kingdom; however, ...
... -- Amphibians, for years considered a leading indicator of ... to a meta-analysis to be published in Ecology ... toxicological tests, researchers from the University of South Dakota, ... prevailing view that amphibians, with their permeable skin and ...
... international group of researchers from Carnegie Mellon University, Goettingen ... in the United Kingdom have received a Human Frontiers ... will help researchers better understand the "cellular GPS" system ... system. In the course of the development ...
Cached Biology News:Can a plant be altruistic? 2Amphibians as environmental omen disputed 2Carnegie Mellon researchers to develop probes to study cellular GPS 2
(Date:8/1/2014)... Wellesley, Mass. (PRWEB) August 01, 2014 ... report, RNAi DRUG DELIVERY: TECHNOLOGIES AND GLOBAL MARKETS ... delivery technologies is expected to grow to nearly $38.8 ... rate (CAGR) of 27.2%. The aptamer delivery category, the ... a phenomenal 58.2% CAGR. , The field of RNAi ...
(Date:8/1/2014)... Glencoe Software, Inc. is pleased ... ( http://glencoesoftware.com/data-inpress.html ), a suite of data ... into on-line publications.  The suite comprises Glencoe ... Photo - http://photos.prnewswire.com/prnh/20140731/132410   ... The DataViewer is a browser-based ...
(Date:7/31/2014)... July 31, 2014 Food and ... increasingly searching for food alternatives that offer variety, ... The food ingredient market has numerous players operating ... as Vital Force Technology (VFT). VFT is ... 4,000 energetic patterns, all tested to produce stable, ...
(Date:7/31/2014)... -- Today BioSpace , the leading life sciences employment and news ... life sciences community in Illinois , Indiana ... Michigan , Minnesota , ... and Wisconsin . BioMidwest is a ... postings on BioSpace originating in this region in 2013. The life sciences ...
Breaking Biology Technology:Global Market for RNAi Drug Delivery Technologies to Reach $38.8 Billion in 2018; Aptamer Delivery Segment Surging at 58.2% CAGR 2Global Market for RNAi Drug Delivery Technologies to Reach $38.8 Billion in 2018; Aptamer Delivery Segment Surging at 58.2% CAGR 3Glencoe Software Launches Data InPress 2Glencoe Software Launches Data InPress 3Functional Ingredient Manufacturer – Vital Force Technology Infuses Raw Materials & Ingredients with Subtle Energy Formula 2Midwest Biotech Leaders Featured On BioSpace Map 2
... Inc. (NASDAQ: DSCO ), a specialty biotechnology ... critical care, reported that data from a preclinical study ... recently published in the May issue of Pediatric ... improvements in lung function following administration of SURFAXIN LS ...
... Fluke Biomedical announced today their popular ... a global audience with the addition of ... http://photos.prnewswire.com/prnh/20120509/SF03362 ) (Logo: http://photos.prnewswire.com/prnh/20120130/SF43337LOGO-b ... the Fluke Biomedical Advantage training center quickly ...
... Biotech Group, a global genomic products and service ... testing for a proprietary targeted chromosomal microarray (CMA) ... microdeletions and microduplications related to a spectrum of ... Cyto OneArray ® is capable of ...
Cached Biology Technology:Newly-Published Study Compares SURFAXIN LS™ and CUROSURF® in Well-Established Model of Respiratory Distress Syndrome 2Newly-Published Study Compares SURFAXIN LS™ and CUROSURF® in Well-Established Model of Respiratory Distress Syndrome 3Newly-Published Study Compares SURFAXIN LS™ and CUROSURF® in Well-Established Model of Respiratory Distress Syndrome 4Newly-Published Study Compares SURFAXIN LS™ and CUROSURF® in Well-Established Model of Respiratory Distress Syndrome 5Fluke Biomedical training center goes global: adds multi-language support 2Phalanx Biotech Group Announces CytoOneArray®, a Targeted Chromosomal Microarray 2
... a dedicated system for SFC and SFE ... of HPLC instrumentation. JASCO has recently added ... of the system: ,- The PU-1580-CO2 delivery ... procedures using carbon dioxide as the mobile ...
...
... Fixed clamp trays and ... Magnetic drive ... 25 mm amplitude ... ml to 2000 ml, including Fernbach ...
... generation of microarrays to detect alternative splicing. ... rapidly elucidate alternatively spliced events in gene ... discovery. The service combines ExonHits proprietary splice ... analysis with Agilents robust microarray platform. The ...
Biology Products: