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:7/10/2014)... June 27, 2014  The American Academy of ... of Standards and Technology (NIST) and the Department ... research and forensic science expert members to the ... an element of the NIST,s Organization of Scientific ... the first appointments made to the new FSSB ...
(Date:7/10/2014)... , July 2, 2014  Unisys Corporation,s (NYSE: ... , Unisys Nederland N.V., today announced that it has been ... implement and manage a new Basic Provision Biometrics solution for ... Unisys won the contract with a solution based on ... software. The term of the contract is up to seven ...
(Date:7/10/2014)... , July 3, 2014 Research ... addition of the "Global Gesture Recognition & ... - Forecasts to 2020" report to their ... Global Gesture Recognition & Touch-Less Sensing Market ... around for a while, but the companies were ...
Breaking Biology News(10 mins):Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 2Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 3Unisys Delivers New Basic Provision Biometrics Solution to Dutch Custodial Institutions Service 2Unisys Delivers New Basic Provision Biometrics Solution to Dutch Custodial Institutions Service 3Global Gesture Recognition & Touch-Less Sensing (2D, 3D, Ultrasonic, IR, Capacitive) Market - Forecasts to 2020 2
... is "Molecule of the Year 2009". This was announced ... Society for Molecular and Cell Biology and Biotechnology Protocols ... Zsuzsanna Izsvk, Dr. Zoltn Ivics and Dr. Lajos Mts ... Berlin-Buch. According to the jury, it was selected out ...
... current controversy over vertebroplastya minimally invasive treatment performed ... vertebral compression fractures that fail to respond to ... your medical team to decide if you are ... experience of hundreds of thousands of other patients ...
... BOSTON (January 19, 2010, 12:00 noon EST) A study ... School of Graduate Biomedical Sciences at Tufts, and Tufts Medical ... cancer. The researchers propose a new model for breast cell ... which appears to be the cell of origin for luminal-like ...
Cached Biology News:'Sleeping Beauty' -- Molecule of the Year 2Society of Interventional Radiology supports treatment for spine fractures: Patient selection key 2Society of Interventional Radiology supports treatment for spine fractures: Patient selection key 3Society of Interventional Radiology supports treatment for spine fractures: Patient selection key 4Cell of origin identified for common type of breast cancer 2
(Date:7/10/2014)... 2014 Research and Markets ( http://www.researchandmarkets.com/research/s3bqj2/photonic ... "International Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, ... report to their offering. ... photonic integration traces its roots in the latter ... photonic integration went unexplored and unfulfilled for several ...
(Date:7/10/2014)... microscopic polymer light resonators that expand in the ... Photonics Laboratory have developed new optical sensors with ... sensors are ideal for detecting trace gas concentrations ... nature, and immunity to electromagnetic interference. , Although ... the MIT team conceived an extremely sensitive, compact ...
(Date:7/10/2014)... The lithium-ion batteries that power our laptops and electric ... a single charge with the help of a sponge-like ... to replace the graphite traditionally used in one of ... times the energy storage capacity of graphite. A paper ... was published today in Nature Communications . , ...
(Date:7/10/2014)... new alliance will see the two universities and NPL ... with business and industry and their complementary academic strengths., ... help to shape the scientific priorities of the UK. ... up to 300 high-calibre PhD students, will provide a ... NPL, the potential of the Laboratory will be grown ...
Breaking Biology Technology:International Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, Module Integration) Market - Forecasts to 2019 2Swell new sensors 2Silicon sponge improves lithium-ion battery performance 2Silicon sponge improves lithium-ion battery performance 3Universities of Surrey and Strathclyde selected as strategic partners in the future operation of the National Physical Laboratory 2Universities of Surrey and Strathclyde selected as strategic partners in the future operation of the National Physical Laboratory 3
... DURHAM, N.C., Dec. 16 Parion Sciences, Inc., ... from the failure of the body,s mucosal defenses, ... have awarded the,company a biodefense grant in excess ... The purpose of the grant is to ...
... KRAS Biomarker PresentsPotential toPersonalize Colorectal Cancer Treatment Determining Who ... , THOUSAND OAKS, Calif., Dec. 16 Amgen ... discuss the clinical utility of the KRAS ... colorectal cancer (mCRC) treated with anti-epidermal growth factor receptor ...
... 16 , - ... The American Journal of Medicine (AJM), one of ... Medicine blog,( http://amjmed.blogspot.com ), a dynamic forum where physicians and ... that have been published in the Journal. , ...
Cached Biology Technology:Parion Sciences Receives NIH Biodefense Grant to Study Novel Methods for Mitigating Radiation-Induced Lung Injury 2Parion Sciences Receives NIH Biodefense Grant to Study Novel Methods for Mitigating Radiation-Induced Lung Injury 3Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 2Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 3Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 4Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 5Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 6Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 7Oncology Biomarker KRAS to be Discussed at FDA Panel Meeting 8Elsevier Introduces The American Journal of Medicine Blog 2Elsevier Introduces The American Journal of Medicine Blog 3
... is the major proteolytic system in ... it catalyzes the selective degradation of ... elimination of proteins with abnormal conformation ... The critical protease in this pathway ...
... [1320] to RFC1 Immunogen Recombinant protein ... Factor C expressed in E. coli. Reactivity ... cerevisiae. Not yet tested in other species. This ... Background Information Replication factor C is ...
... Bacterial DNA Isolation Kit provides a rapid ... genomic DNA from the various bacterial species ... the isolation of genomic DNA from both ... milk samples. ,Purification is based on ...
... Chemicon Select Tissue Arrays are intended for ... tissues were fixed in neutral buffered formalin ... and diagnosis was performed by certified pathologists. ... paraffin blocks and relocated into a new ...
Biology Products: