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ELECTRIC IMPEDANCE OF ARBACIA EGGS.

K S Cole¹, R H Cole

¹Department of Physiology, College of Physicians and Surgeons, Columbia University, New York, and the Biological Laboratory, Cold Spring Harbor, Long Island.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

Electrical properties of Arbacia punctulata eggs were measured. Fertilization significantly alters egg capacitance, likely due to a new fertilization membrane, impacting cellular electrical behavior.

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Area of Science:

Cellular Electrophysiology
Biophysics
Marine Biology

Background:

Understanding the electrical properties of cell membranes is crucial for comprehending cellular function.
Fertilization triggers significant morphological and physiological changes in eggs, potentially altering their electrical characteristics.

Purpose of the Study:

To measure the alternating current resistance and capacity of unfertilized and fertilized Arbacia punctulata eggs.
To investigate how frequency affects these electrical properties.
To elucidate the structural and electrical changes occurring upon fertilization.

Main Methods:

Alternating current (AC) resistance and capacity measurements were performed on egg suspensions.
Measurements spanned a wide frequency range, from 10^3 to 1.64 x 10^7 cycles per second.
Data analysis focused on capacitance changes and frequency dependence.

Main Results:

Unfertilized eggs exhibited a stable plasma membrane capacitance (0.73 microf./cm.2).
Fertilized eggs showed a high low-frequency capacitance (3.1 microf./cm.2) that decreased significantly at high frequencies (0.55 microf./cm.2).
Internal specific resistance was approximately 6 times that of sea water at low frequencies, decreasing to 4 times at high frequencies.

Conclusions:

The observed capacitance changes in fertilized eggs are likely attributed to a fertilization membrane, creating a distinct interspace.
Surface conductance may contribute to frequency-dependent capacitance at lower frequencies.
Electrical current penetration into the nucleus and cytoplasm was observed at highest frequencies, suggesting nuclear membrane capacitance around 0.1 microf./cm.2.