Featured Research

from universities, journals, and other organizations

Apparent Violation Of Local Causality With Chemical Trigger Waves - Tickle It Here And It Giggles Over There

Date:
April 12, 1999
Source:
Max Planck Society
Summary:
Any child can tell that upon throwing a stone into a pond, concentric waves emerge where the stone hit the water suface and then approach the shore, whereas the opposite, i.e. a wave emerging from the shore towards the location where the stone hit, is not observed. However such a phenomenon, namely the "telephatic" initiation of a trigger wave in a remote region, can occur with dissipative chemical trigger waves as reported by scientists from the Fritz Haber Institute of the Max Planck Society, Berlin.

Any child can tell that upon throwing a stone into a pond, concentric waves emerge where the stone hit the water suface and then approach the shore, whereas the opposite, i.e. a wave emerging from the shore towards the location where the stone hit, is not observed. However such a phenomenon, namely the "telephatic" initiation of a trigger wave in a remote region, can occur with dissipative chemical trigger waves as reported by scientists from the Fritz Haber Institute of the Max Planck Society, Berlin (Dahlem) (Science Vol. 284, April 9th 1999).

Related Articles


Trigger waves are a widespread phenomenon in spatially extended systems, both in systems that are conservative (ripples on a water surface) and dissipative (active chemical media, nerve axons and heart tissue). They typically originate from the location where a perturbation (trigger) has been applied. If, however, coupling between different parts is nonlocal, that is, when any change of the state affects instantaneously the whole systems, the necessity for local causality will no longer exist.

The experiment was performed with an electrocatalytic reaction on a platinum ring electrode. Sufficiently strong displaced from chemical equilibium, the electrooxidation of formic acid exhibits bistability between a passive and an active state. A local perturbation leads to a local transition from one (metastable) state (for example passive) to the other (the active) state which then spreads through front propagation until the entire system has been switched to the other state. Typically, a perturbation with opposite sign which would make the systems even more passive would not be expected to have any effect. In contrast, the experiments showed that such as perturbation triggered propagating fronts on the opposite side of the ring.

The dominating coupling process in electrochemical systems is ion migration under the influence of an electric field (electromigration). Electrical field effects spread with the velocity of light. Therefore, the coupling is nonlocal meaning that it affects the whole systems practically instantaneously.

The experimental findings could be reproduced by solution of the corresponding reaction-migration equation. The nonlocal coupling function turned out to be positive for small distances (thus enabling front propagation) but negative further away allowing a local perturbation with the wrong sign to manifest itself at a long distance.

Nonlocal effects such as remote triggering are expected whenever a very fast coupling occurs in a systems with slow local dynamics. This also includes biochemical processes coupled by electric field effects as they occur in muscle tissue as well as in neural activity.


Story Source:

The above story is based on materials provided by Max Planck Society. Note: Materials may be edited for content and length.


Cite This Page:

Max Planck Society. "Apparent Violation Of Local Causality With Chemical Trigger Waves - Tickle It Here And It Giggles Over There." ScienceDaily. ScienceDaily, 12 April 1999. <www.sciencedaily.com/releases/1999/04/990412075228.htm>.
Max Planck Society. (1999, April 12). Apparent Violation Of Local Causality With Chemical Trigger Waves - Tickle It Here And It Giggles Over There. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/1999/04/990412075228.htm
Max Planck Society. "Apparent Violation Of Local Causality With Chemical Trigger Waves - Tickle It Here And It Giggles Over There." ScienceDaily. www.sciencedaily.com/releases/1999/04/990412075228.htm (accessed November 28, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, November 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

NASA's First 3-D Printer In Space Creates Its First Object

NASA's First 3-D Printer In Space Creates Its First Object

Newsy (Nov. 26, 2014) The International Space Station is now using a proof-of-concept 3D printer to test additive printing in a weightless, isolated environment. Video provided by Newsy
Powered by NewsLook.com
Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Reuters - Innovations Video Online (Nov. 26, 2014) Innovative recycling project in La Paz separates city waste and converts plastic garbage into school furniture made from 'plastiwood'. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Blu-Ray Discs Getting Second Run As Solar Panels

Blu-Ray Discs Getting Second Run As Solar Panels

Newsy (Nov. 26, 2014) Researchers at Northwestern University are repurposing Blu-ray movies for better solar panel technology thanks to the discs' internal structures. Video provided by Newsy
Powered by NewsLook.com
Today's Prostheses Are More Capable Than Ever

Today's Prostheses Are More Capable Than Ever

Newsy (Nov. 26, 2014) Advances in prosthetics are making replacement body parts stronger and more lifelike than they’ve ever been. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins