NON-THERMAL EFFECTS OF ALTERNATING ELECTRICAL FIELDS ON BIOLOGICAL STRUCTURES.
Abstract
ORIENTING EFFECTS OF ALTERNATING ELECTRIC FIELDS ON NONSPHERICAL PARTICLES: Theoretical investigation shows that such a particle embedded in a medium having a different complex dielectric constant will generally be oriented by an alternating electrical field. RESPONSE OF NONSPHERICAL BIOLOGICAL PARTICLES TO ALTERNATING ELECTRIC FIELDS: Stable orientation evoked by an alternating electric field was studied theoretically for arbitrary shapes and compositions of biological particles. As frequency of the electric field changes, both sudden jumps and gradual changes may arise in the stable direction. STUDIES OF THE TIME CONSTANT FOR PEARL-CHAIN FORMATION: Influence of particle size and sub- and supra-threshold electric field strengths was measured. The best experimental estimate of the time constant is 1.5 (particle diameter in microns) squared, where the constant is the time in seconds required for spherical particles of low dielectric constant (< 10), suspended in an aqueous medium, to form pearl chains when the radio-frequency field strength was a threshold value. PEARL CHAINS TRANSVERSE TO THE ELECTRIC FIELD VECTOR: These were observed concurrently with longitudinal (ordinary) pearl chains. ELECTRICAL PROPERTIES OF BOUND WATER: Dielectric constant and conductivity data which pertain to hemoglobin were measured for the 1- to 1000-mc range.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 13, 1965
- Accession Number
- AD0615661
Entities
People
- Herman P. Schwan
Organizations
- University of Pennsylvania