Related Experiment Video
Updated: Feb 15, 2026

Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
Published on: April 5, 2019
Electric response of a back photoreaction in the bacteriorhodopsin photocycle
Abstract:
The electric response of a back photoreaction in the bacteriorhodopsin photocycle was investigated. The proton pumping activity of green flash excited bacteriorhodopsin stops if the M412 form is illuminated by blue light (Karvaly and Dancsházy, 1977). In the present work a fast negative displacement current signal was measured in an oriented membrane suspension system, indicative of back movement of protons from M412 to BR570. Quantitative evaluation of the data shows that there are at least two steps in the back reaction, with different rate constants. The temperature dependence of the rate constants show simple linear Arrhenius behavior between 5 degree and 40 degree C. The rate constants were slower by a factor of 1.8 in D2O suspension. The relevance of the protein electric response signals (PERS) observed in this paper to the early receptor potential is discussed.
More Related Videos
09:06Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice
Published on: January 9, 2019
10:35Designing Microfluidic Devices for Studying Cellular Responses Under Single or Coexisting Chemical/Electrical/Shear Stress Stimuli
Published on: August 13, 2016
Related Concept Videos
Finding Electric Potential From Electric Field
Determining Electric Field From Electric Potential
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
Electric Potential Energy in a Uniform Electric Field
Electrical Systems
To derive the transfer function, consider an RLC...
Electric Charges
The English physicist William Gilbert studied the phenomenon of static electricity in...
Electric Field
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...