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:12/15/2014)... 12, 2014 Research and Markets ... the "Global Facial Recognition Market 2015-2019" ... http://photos.prnewswire.com/prnh/20130307/600769 Facial recognition is ... Facial recognition system measures the overall facial feature ... mouth, and the distance between eyes. Facial recognition ...
(Date:12/11/2014)... Dec. 10, 2014  That blood pressure plays a role ... Hypertension – the medical term for high blood pressure – ... and the inflatable cuff that,s used in measuring blood pressure ... there,s nothing new about hypertension, its triggers and its effects. ... the condition and the best ways to treat it. ...
(Date:12/10/2014)... Dec. 9, 2014  Valencell, a leader in performance ... a staggering demand from its licensees for highly accurate, ... is not solely coming from fitness and health sectors, ... "A wearable is only as useful as the ... the ultimate driver in long-term mass consumer adoption of ...
Breaking Biology News(10 mins):Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4Wearable Technology Products Demand Highly Accurate Biometric Technology 2
... Spanish . , Biopesticides containing beneficial ... but U.S. Department of Agriculture (USDA) scientists have shown ... approach, dubbed "liquid culture fermentation," offers several benefits, including ... of insect-killing fungi, including Isaria or ...
... therapy clinical trial in the world for Fabry disease, a rare ... have it by as much as 40 years. Researchers ... patient,s blood. Then a working copy of a new gene will ... During the final phase of the trial, researchers hope to transplant ...
... found the first ancient remains of a calcified ovarian teratoma, in ... era. The find confirms the presence in antiquity of this type ... which are difficult to locate during the examination of ancient remains. ... of bone were found., Teratomas are usually benign and contain remains ...
Cached Biology News:New, cost-cutting approach to formulating pest-killing fungi 2Canada launches first gene therapy trial for Fabry disease 2Canada launches first gene therapy trial for Fabry disease 3Ovarian tumor, with teeth and a bone fragment inside, found in a Roman-age skeleton 2
(Date:12/22/2014)... 22, 2014   Synthetic Biologics, Inc. ... pathogen-specific therapies for serious infections and diseases, ... today announced positive topline safety and tolerability ... of SYN-004, the Company,s investigational oral beta-lactamase ... difficile (C. difficile) infection, antibiotic-associated diarrhea ...
(Date:12/22/2014)... Dec. 22, 2014 GenomeDx Biosciences today announced ... Cancer Classifier, a genomic test for prostate cancer, was ... men managed by radical prostatectomy without adjuvant therapy. Although ... relatively uncommon, using tumor genomics to identify these men ... is an important advance. The study has been ...
(Date:12/22/2014)... 22, 2014 ITRA Global, one of ... of commercial real estate, has further expanded its global ... Perth and Brisbane, Western Australia, reports Mylinda Vick, CCIM, ... ITRA Global / ACORPP (Australian Corporate Property and ... company providing property services to a wide range of ...
(Date:12/19/2014)... Charm Sciences is pleased to announce that ... Aflatoxin M1 in raw commingled milk is the first ... The peer reviewed report of the validation by Technology ... and Fisheries Research (ILVO-T&V) has been published by the ... most toxic aflatoxin and a known carcinogen, can be ...
Breaking Biology Technology:Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 2Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 3Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 4Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 5Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 2Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 3ITRA Global Continues International Expansion in Perth and Brisbane, Australia 2Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2
... orbit and the National Aeronautics and Space Administrations (NASA) ... the Earths environment to help predict and prevent infectious ... remote sensing technology aids specialists in predicting the outbreak ... diseases today such as Ebola, West Nile virus and ...
... work of the National Nanotechnology Initiative has just been ... (NSET) Subcommittee of the National Science and Technology Councils ... Coordination Office (NNCO). The 2007 NNI Strategic ... NNI to ensure that the United States derives growing ...
... Robert F. Johnston Named Executive Chairman of the Board ... S. Colin Neill Named President, ISELIN, ... changes in its Board of Directors,and Management, effective immediately., Board Changes, ... Chairman., Haim Aviv, Ph.D., David Schlachet and Mony Ben Dor have ...
Cached Biology Technology:NASA technology helps predict and prevent future pandemic outbreaks 2National Nanotechnology Initiative releases new strategic plan 2National Nanotechnology Initiative releases new strategic plan 3Pharmos Corporation Announces Board and Management Changes 2Pharmos Corporation Announces Board and Management Changes 3
Rabbit polyclonal antibody to Glutathione-S-Transferase (GST)...
Chicken polyclonal antibody to Glutathione-S-Transfrease (GST)...
... FL ATP-Gamma-S binds to ATP-binding proteins. ... BODIPY FL fluorophore was linked through ... to its potential use for binding ... is an important new substrate for ...
... standard microarray image analysis software because of ... tools, visualizations, automation capabilities, performance and ease ... every GenePix scanner, and it also imports ... types of arrays. A wide range of ...
Biology Products: