Changes in light scattering associated with the action potential in crab nerves

  title={Changes in light scattering associated with the action potential in crab nerves},
  author={Lawrence B. Cohen and Richard Darwin Keynes},
  journal={The Journal of Physiology},
1. Changes in light scattering from stimulated crab leg nerves were measured in an effort to study changes in structure that occur during the action potential. 
Changes in light scattering that accompany the action potential in squid giant axons: potential‐dependent components
1. To obtain information about structural events that occur in axons, changes in light scattering from squid giant axons were measured during action potentials and voltage‐clamp steps.
Analysis of the potential‐dependent changes in optical retardation in the squid giant axon
1. An analysis has been made of the change in optical retradation of the membrane elicited by the application of voltage—clamp pulses in squid giant axons.
Changes in axon light scattering that accompany the action potential: current‐dependent components
When light scattering was measured during hyperpolarizing and depolarizing voltage‐clamp steps, relatively large scattering changes were found to depend on the time integral of the ionic current and not on the changes in conductance or potential.
Mechanical, thermal, and optical changes of the nerve membrane associated with excitation.
  • A. Watanabe
  • Physics
    The Japanese journal of physiology
  • 1986
Nerve fibers produce several non-electrical signals on excitation, and recent findings are discussed in the hope that some of them might give us clues to molecular events underlying the excitation process.
Effects of External Electric Fields on Light Transmittance in Isolated Crayfish Nerves
A PEEF and EEF produced an irreversible increase in the variation of light transmittance in normal nerves but a reversible increase in TTX treated nerves, which may be due to either an alteration in the ion/fluid flux within the nerve or a physical alteration of protein molecules in the membranes.
Change in optical activity of a lobster nerve associated with excitation.
To record the change in optical rotation of a nerve fibre associated with excitation, an optical apparatus was constructed using a polarizer, a photo‐elastic modulator, an analyser and a lock‐in amplifier to deduce the birefringence signal from a series of R‐signals observed at various nerve azimuths.
Advances in recording scattered light changes in crustacean nerve with electrical activation
Improved detection schemes disclosed high temporal structure of the optical signals and allowed further investigations of biophysical mechanisms responsible for such changes, and new developments in computer and optical technology allow optical recording with higher temporal resolution than could be achieved previously.


Light scattering and birefringence changes during activity in the electric organ of Electrophorus electricus
The size and time course of the changes in light scattering and in bire‐fringence that occur during and after the discharge of the electric organ are determined.
Light Scattering and Birefringence Changes during Nerve Activity
Two optical techniques—light scattering and birefringence—have been used to detect rapid structural changes accompanying the action potentials in two types of non-myelinated nerve fibre. Changes in
The effect of stimulation on the opacity of a crustacean nerve trunk and its relation to fibre diameter
Support for this view has been provided by showing that the single large fibre of the cuttlefish does actually undergo a change in diameter when it is stimulated, and the evidence pointing in this direction is set out here.
Changes in fluorescence, turbidity, and birefringence associated with nerve excitation.
Various types of light sources were used during the course of the present experiments; an Osram quartz-iodine lamp operated at d-c 15 volts and approximately 150 watts was used in the later staage of
Ultrastructural Studies of the Squid Nerve Fibers
The present paper deals with three different problems: the general structure in the different species of squid used, the nature of the pathways located in the Schwann cell layer, and the structure of the axolemma.
The depolarization of crustacean nerve by stimulation or oxygen want
IN 1927, at the time of his sudden untimely death, Levin, working with crustacean nerve, was investigating a remarkable characteristic of the action current, which he termed the "retention of action
The permeability of the squid giant axon to radioactive potassium and chloride ions
The purpose of this paper is to give a brief account of the preliminary influx determinations, and of a few experiments on the K efflux from axons into which 42K had been injected.
The Ultrastructure of Nerve Axoplasm
G Gothlin (1913) showed beyond doubt that the axis cylinder is weakly uniaxially positive in life,particularly at the regions of nodal constriction (vertebrate axons).