Bioacoustics Research Lab
University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
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Title Study of efficient sonochemical reaction by focused ultrasound.
Author Kawabata K, Umemura S.
Journal Proc Ultrason Symp IEEE
Volume
Year 1992
Abstract Efficient methods of inducing sonochemical reactions with focused ultrasound produced with phased array transducers are described in this paper. One uses periodic switching between clockwise and counterclockwise spiral focal fields, and the other uses superimposition of the second harmonic wave. Sonochemically induced oxidation of iodide ion was used to evaluate the efficiency of these methods. The first method exhibited about ten times higher oxidation rate at the optimum switching period (3 msec) than the conventional CW insonation. The second one could drastically decrease the ultrasound intensity threshold for the sonochemical reaction and exhibited even higher reaction rate than the first method.


Title Study of spatial inhomogeneity of tissue using ultrasound.
Author Lwin T.
Journal Thesis(MS): Univ of Illinois
Volume
Year 1995
Abstract No Abstract Available.


Title Study of the cause of temperature rise at the muscle-bone interface during ultrasound hyperthermia.
Author Fujii M, Sakamoto K, Toda Y, Negishi A, Kanai H.
Journal IEEE Trans Biomed Eng
Volume
Year 1999
Abstract Undesirable temperature rise at the muscle-bone interface has been one of the major problems during ultrasound hyperthermia treatment. In this study, the authors examined by both computer calculation and phantom experiment the cause of this problem. Ultrasound penetrates a bone in two different waveforms, longitudinal and transversal. The transmission coefficient of these two waves vary greatly with the incident angle. From both theoretical and experimental results, the incident angle dependency of the interface heat was confirmed. When the incident angle is less than the critical angle of the longitudinal wave, the main cause of the temperature elevation is the absorption of the longitudinal wave in the bone. When the incident angle is larger than the critical angle of the longitudinal wave, the transversal wave becomes the major cause of the heat generation. At the incident angles larger than the critical angle of the transversal wave, no temperature rise is produced by the absorption of the ultrasound at the bone; the incident longitudinal wave, strengthened by the reflected wave, is absorbed in the muscle just in front of the bone. The heat generated in the muscle is transported to the interface so that the temperature of the interface and bone increases slightly.


Title Study of the effect of ultrasound on the antigenic activity of human erythrocytes.
Author Piruzyan LA, Mayev RG, Nisnevich MM, Koifman MM, Korneva ZN.
Journal Biofizika
Volume
Year 1986
Abstract Change in the erythrocyte membrane in an ultrasonic radiation field (frequency 0.88 MHz, intensity range 0.05-1 W/cm2) is shown in relation to antigens of the ABO system of human erythrocytes. Ultrasound was found to have a differentiated action on the A and B antigens of the ABO system. The effect was found to depend on the concentration of erythrocytes in the suspension. Assumptions are made on the possible mechanism of action of ultrasound on the erythrocyte membrane.


Title Study of the feasibility of employing ultrasound for determining structural inhomogeneities and residual stress concentrations in metals and plastics and in structures fabricated from these materials.
Author Fry WJ.
Journal Rep Altair Corp
Volume
Year 1963
Abstract No abstract available. Final report.


Title Study of the non-enzymatic hydrolysis of nucleotides by the method of ultrasonic spectroscopy.
Author Braginskaya FI, Zaretskii AA.
Journal Biofizika
Volume
Year 1973
Abstract The authors have studied the kinetic characteristics of the reactions of non-enzymatic hydrolysis of the adenine nucleotides (AMP, ADP and ATP) estimated from measurement of the relaxation part of the absorption of ultrasound in aqueous solutions. The measurements were made with a pulse apparatus over the frequency range f = 12-68 Mc/s. The kinetic curves of the acid hydrolysis of the compounds studied are presented and the "apparent" rate constant of the reactions calculated. Analysis of the results of ultrasonic spectroscopy has established the high stability of ADP as compared with ATP to the hydrolytic splitting off of the phosphate group which is in good agreement with the results of biochemical methods. The possibility of using the method of ultrasonic spectroscopy for studying the kinetic characteristics of biochemical reactions is discussed.


Title Study of the phase transitions in polymesomorphic liquid crystals by ultrasonic methods.
Author Kapustin AP, Zvereva GE.
Journal Sov Phys Crystallogr
Volume
Year 1966
Abstract The results of measurements of the velocity and absorption, and of ultrasound in the density of p, p'-nonoxybenzaltoluidine are reported. The measurements were carried out in the temperature interval from 70 to 80?C and at frequencies from 2 to 15 Mc. The behavior of these physical properties is explained in detail in the region of the transitions and the latter are interpreted as first-order transitions.


Title Study of ultrasonic haemolysis of erythrocytes in normal and pathological conditions.
Author Braginskaya FI, Sultanova GG, Akopyan VB, Korman DB, Kruglyakova KE.
Journal Biofizika
Volume
Year 1982
Abstract The kinetic method of the investigation of erythrocyte haemolysis normal and at different tumour pathologies by ultrasound was developed. The quantitative parameters of the mechanical resistance of erythrocytes were studied (time and velocity of haemolysis, time of half-destruction, the distribution of erythrocytes by their haemolytic resistance). The studied parameters differ between the normal state and the tumour in organism. The analysis of the differential distribution of erythrocytes by their resistance to ultrasonic haemolysis revealed the occurrence in the patient's blood of erythrocytes with increased resistance ("young" erythrocytes). The mechanical resistance of the erythrocytes at pathology was shown to increase ascompared with the normal state. The differences in the effective constants of ultrasonic haemolysis velocity were estimated for the normal state and for different tumours. They are caused by the changes in visco-elastic properties of red blood cells.


Title Study of ultrasonic properties of the aqueous solution of gelatin.
Author Ruo F.
Journal Chin J Acoust
Volume
Year 1984
Abstract The experimental investigation of aqueous solution of the gelatin has been made by using ultrasound at frequency 11.4 MHz. The relation between concentration and ultrasound absorption does not reach its saturated value even at the weight concentration of the solution c = 8.5%. When the concentration is more than 1.5%, the solution transforms into jelly under room temperature, but the ultrasonic absorption does not change in the whole transformation process. When the temperature of the solution is decreased to the vicinity of gelling point, the viscosity n of the solution increases gradually with time, making the value of sound absorption calculated from n larger than the experimental one by several orders. But when the temperature of the solution is appropriately higher than the gelling point, the calculated value of sound absorption is smaller than the experimental one but with the same order. The temperature at which the maximum sound velocity occurs in the concentrated (c = 6.4%) solution is not much different from that in pure water. All the phenomena observed have been discussed.


Title Study of ultrasonically induced structural changes in concentrated polymer solutions.
Author Mikhailov IG, Fedorova NM.
Journal Sov Phys Acoust
Volume
Year 1963 [1963]
Abstract It is shown that the absorption coefficient for ultrasonic waves is a sensitive characteristic of structural changes occurring in concentrated polymeric solutions. A marked change in the absorption coefficient was detected in the 0 to 60? temperature range, and the change is ascribable solely to the change in the structure of the solutions in response to the temperature. The assumption is advanced that the structural changes induced by intense ultrasound as well as by the temperature increase are related to changes in the number of short-lived Van der Waals nodes in the polymeric network. It is shown that structural changes in the intense ultrasonic field were not produced by cavitation.


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