Accession Number : AD0620916

Title :   THERMAL AND ELECTRICAL CONDUCTIVITIES OF BIOLOGICAL FLUIDS AND TISSUES.

Descriptive Note : Quarterly rept. for 1 Apr-30 Jun 65,

Corporate Author : GEOSCIENCE LTD LA JOLLA CALIF

Personal Author(s) : Poppendiek,Heinz F. ; Greene,Norman D. ; Randall,R. ; Morehouse,P. M.

Report Date : 30 JUN 1965

Pagination or Media Count : 18

Abstract : The results of several erythrocyte settling experiments in vertical and horizontal electrical conductivity cells indicated that removal of all cells from blood samples prior to the conductivity measurements insures removal of the settling parameter. Experimental time variations in the electrical conductivity of blood that had previously been cryogenically stored are noted to be small but as yet inconclusive. Comparison of conductivity results for plasma of blood that had been cryogenically stored with and without PVP additive were significantly different, the preserved blood having lower hemolysis and higher conductivity. The thermal conductivities of bovine brain, kidney, and liver were measured after these specimens were slowly frozen to 0C and then slowly thawed; the conductivities increased approximately 10 percent above values obtained for corresponding unstressed specimens. The corresponding conductivity changes for samples that were cryogenically frozen and more quickly warmed were smaller. Anaytical thermal conductivity models were compared to experimental data obtained previously; good correlations of the results were obtained. (Author)

Descriptors :   (*BODY FLUIDS, ELECTRICAL CONDUCTIVITY), (*TISSUES(BIOLOGY), THERMAL CONDUCTIVITY), (*BLOOD, FREEZING), ERYTHROCYTES, CRYOGENICS, BLOOD PLASMA, STORAGE, PRESERVATION, ADDITIVES, HEMOLYSIS, BOVINES, BRAIN, KIDNEYS, LIVER, STRESS(PHYSIOLOGY)

Distribution Statement : APPROVED FOR PUBLIC RELEASE