Navigation Links
Why nerve cells work faster than the theory allows

ot always open at the same threshold value, but nevertheless open almost simultaneously. When a sodium channel opens, it influences, according to the new model, other sodium channels in the immediate neighborhood ?the channels open "cooperatively" and not ?as according to Hodgkin-Huxley ?independently of each other and only dependent on the voltage across the membrane. To test this hypothesis, the scientists used a trick: If it would be possible to measurably stop the cooperative mechanism, then that would be a good argument for its existence. They achieved this by blocking a part of the sodium channels with the nerve poison tetrodoxin, so that the channels that still functioned lay so scattered in the membrane, that they were not able to cooperate.

Furthermore, the researchers were able to show that the cells probably used this novel mechanism to differentiate between the received signals and only answer to certain ones. Bjoern Naundorf summarizes these results, „The cells function like a high-pass filter; fast signals are transmitted well, slow signals are suppressed". Both aspects of the initiation of the action potential play different roles. The large variability of the threshold potentials allows the cells to ignore slowly varying stimuli. The cells continuously increase their threshold so that in many cases no impulse is initiated at all. The fast activation of action potentials, on the other hand, helps the cells to transmit fast changing signals, even with high precision. According to the Hodgkin-Huxley model, the cells would lack the ability to do this.

"Many scientists ?including us ?saw the Hodgkin-Huxley model up to now no longer as a hypothesis, but believed that it was principally applicable to all neurons", says Fred Wolf, who led the study at the Max Planck Institute for Dynamics and Self-Organization in Göttingen. He and his colleagues have now shown that this is not so. The better cognitive ability of higher animals, such as ca
'"/>

Source:Max-Planck-Gesellschaft


Page: 1 2 3 4

Related biology news :

1. Wisconsin scientists grow critical nerve cells
2. Clam embryo study shows pollutant mixture adversely affects nerve cell development
3. Zebrafish may hold key to understanding human nerve cell development
4. New component of the brakes on nerve regeneration found
5. Cerebral navigation: How do nerve fibers know what direction to grow in?
6. Molecular messengers perform a crucial role in the ability of injured nerve cells to heal themselves
7. Diabetic nerve therapy shows striking results
8. Malfunctioning bone marrow cells sabotage nerve cells in diabetes
9. UIC researchers show protein routes messages in nerve cells
10. Researchers find molecule that inhibits regrowth of spinal nerve cells
11. Gradient guides nerve growth down spinal cord
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Why nerve cells work faster than the theory allows

(Date:7/23/2014)... around the world by 2050, according to one of ... Change (IPCC), may be advantageous to the physiology and ... of forage plants such as Stylosanthes capitata Vogel ... countries such as Brazil., The conclusion is from a ... Biology at the Ribeiro Preto Faculty of Philosophy, Sciences ...
(Date:7/23/2014)... MA -- What do mollusks, starfish, and corals ... habitat, they are all calcifiersorganisms that use calcium ... and shells for stability and protection. , The ... published by the Marine Biological Laboratory, addresses the ... changes worldwide. , As atmospheric carbon dioxide rises, ...
(Date:7/23/2014)... 23, 2014   MedNet Solutions , a ... study management systems, is pleased to announce that ... sciences industry executive with over 25 years of ... Clareece will be responsible for MedNet,s day-to-day operating ... and quality product/service delivery.  "We ...
Breaking Biology News(10 mins):An increase in temperature by 2050 may be advantageous to the growth of forage plants 2An increase in temperature by 2050 may be advantageous to the growth of forage plants 3An increase in temperature by 2050 may be advantageous to the growth of forage plants 4Calcification in changing oceans explored in special issue of The Biological Bulletin 2MedNet Appoints Clareece West As Chief Operating Officer 2
... and New South Wales have put aside their competitive ... project, as announced by Innovation Minister Gavin Jennings and ... today. Scientists from the Monash Institute of ... will compare two different methods of creating patient-specific stem ...
... the recipients of the 2007 National Medal of Science, ... will receive the medals at a White House ceremony ... of Science laureates have contributed to American science with ... of the National Science Foundation (NSF). "Their legacies have ...
... Dogs suffering from lymphoma will be able to receive ... counterparts, as North Carolina State University becomes the first ... transplants in a clinical setting. Dr. Steven Suter, ... Veterinary Medicine, received three leukophoresis machines donated by the ...
Cached Biology News:Stem cell research puts interstate rivalry on hold 2White House announces 2007 National Medal of Science laureates 2NC State first university in nation to offer canine bone marrow transplants 2
(Date:7/22/2014)... Piscataway, NJ (PR Web) July 21, 2014 (PRWEB) ... Jersey Center for Biomaterials, at Rutgers University. ... exchange information and ideas across the full spectrum ... focusing on selected research and development topics that ... application. Activities have been programmed to:, ...
(Date:7/22/2014)... the National Institute of Standards and Technology (NIST) ... a new design for an atomic clock that ... a microcomb. , The microcomb clock, featured on ... new journal Optica ,* is the first ... its accurate conversion of optical frequencies to lower ...
(Date:7/22/2014)... DALLAS , July 22, 2014   ... replacement therapy using natural, bio-identical hormone pellets, today ... , MD to the company.   Dr. Rouzier is ... training physician.      Dr. Rouzier was ... at UCLA and is a board certified emergency ...
(Date:7/22/2014)... Automated cell culture systems are instruments that ... They allow production of optimum cells at a large ... discovery and industries and biopharmaceutical companies. Cell culture automation ... cryobanking, cell-based assays, and cellular expression systems as they ... the Global Cell Culture market will grow ...
Breaking Biology Technology:The 2014 NJ Symposium on Biomaterials Science Earns Society for Biomaterials Endorsement 2'Comb on a chip' powers new NIST/Caltech atomic clock design 2Dr. Neal Rouzier Joins BioTE Medical 2Dr. Neal Rouzier Joins BioTE Medical 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 2Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 4
... Amylin Pharmaceuticals,Inc. (Nasdaq: AMLN ) will be ... Point on Wednesday, June 11, 2008 at 1:20,p.m. PT. ... Pharmaceuticals, will be providing a corporate overview., The ... will be made,available following the event. The Web cast ...
... 5 Telik, Inc.,(Nasdaq: TELK ) announced that ... Annual Needham & Company Biotechnology and Medical,Technology Conference in ... 10:00,a.m. Eastern time (7:00 a.m. Pacific time). A live ... the Telik website, http://www.telik.com ., Telik, Inc. of ...
... Boston Scientific,Corporation (NYSE: BSX ) is scheduled ... being held June 9-12 in Dana Point,CA., Jim ... presentation which will be followed by a 25-minute question ... 8:00 a.m.,PT., A live webcast of Mr. Tobin,s ...
Cached Biology Technology:
... pump is a dedicated cuff pump for small ... replaces manual inflation and can be used for ... mouse and rat; from single up to multi-channel ... pump has adjustable cut-off pressure in 50 mmHg ...
... space and organize gloves, safety glasses, ... are the perfect benchtop storage bins ... processing and manufacturing. Clear static-dissipative PVC ... they attract. Open-slot design for easy ...
... These handy dispensers save space ... hats, and other garb. They are ... small parts used in labs, processing ... static charges and the particles they ...
... Measurement of light production by luciferase-cDNA transfected ... valuable technique in the development of reporter ... used as an indicator for the transcription ... luciferase enzyme is due to advantages such ...
Biology Products: