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BRL Abstracts Database |
Your search for ultrasound produced 3296 results. Page 107 out of 330
Title |
Effects of ultrasound n bilayer lipid membranes. |
Author |
Rohn KR,Rooney JA. |
Journal |
J Acoust Soc Am |
Volume |
|
Year |
1977 |
Abstract |
The effects of ultrasound of a frequency of 1 MHz on an oxidized cholesterol bilayer lipid membrane (BLM) were observed for the intensity range from 0 to 1.5 W/cm2. In the experimental arrangement the BLM was formed in a 0.9-mm hole in a teflon support positioned in the farfield of a plane-wave sound field. In a typical experiment the BLM was formed in its support separating two chambers containing KCl or NaCl in aqueous solution. The electrical parameters of the BLM were monitored using platinum electrodes on both sides of the teflon support. At an intensity of 1.5 W/cm2 the sound caused the membrane to rupture, in the intensity range from 0.5 to 1.5 W/cm2 it accelerated the draining of the bulk cholesterol from the teflon during the formation of the BLM and at all intensities the sound had no effect on the conductance, capacitance, or the dependence on each on the voltage applied across the membrane. These results will be discussed in relation to determining the effects of ultrasound on nerve membranes.
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Title |
Effects of ultrasound of high intensity on cellular structures. |
Author |
Lehmann JF, Baldes EJ, Krusen FH. |
Journal |
Arch Phys Med Rehabil |
Volume |
|
Year |
1956 |
Abstract |
No absract available. |
Title |
Effects of ultrasound on agglutination and aggregation of human erythrocytes in vitro. |
Author |
Pohl EE, Rosenfeld EH, Pohl P, Millner R. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1995 |
Abstract |
A new experimental approach has shown that human erythrocytes of different blood groups were induced to form more agglutinates at a sound pressure of 70-240 kPa in vitro than the control erythrocytes. Similar effects were observed for alcian blue and dextran stimulated aggregation and for spontaneous aggregation. The increase of agglutination or aggregation was reversible. Heating and acoustic cavitation were shown not to be responsible for this effect. Bulk fluid movement produced by ultrasound irradiation appeared to cause the described phenomenon. Possible underlying mechanisms connecting the acoustic streaming and agglutination or aggregation behaviour of the cells are proposed. |
Title |
Effects of ultrasound on an experimental bone tumor. |
Author |
Cerino LE, Janes JM, Ackerman E. |
Journal |
Surg Forum |
Volume |
|
Year |
1965 |
Abstract |
No abstract available. |
Title |
Effects of ultrasound on bone tumors. |
Author |
Cerino LE,Ackerman E, Janes JM. |
Journal |
Book Chapter |
Volume |
|
Year |
1968 |
Abstract |
No abstract available. |
Title |
Effects of ultrasound on catalase and malate dehydrogenase. |
Author |
Kashkooli HA, Rooney JA, Roxby R. |
Journal |
J Acoust Soc Am |
Volume |
|
Year |
1980 |
Abstract |
Catalase and malate dehydrogenase (MDH) were subjected to the sound field produced by a transversely oscillating wire driven at 20 kHz. Catalase was not inactivated under any conditions of sonication whereas MDH inactivation increased.exponentially with the duration of sonication and depended upon the initial enzyme concentration. The inactivation was not the result of collapse cavitation or thermal inactivation and was probably related to the presence of acoustic microstreaming. |
Title |
Effects of ultrasound on cell structure. |
Author |
Lepeschkin WW, Goldman DE |
Journal |
J Cell Comp Physiol |
Volume |
|
Year |
1952 |
Abstract |
No abstract available. |
Title |
Effects of ultrasound on Drosophila--I. Killing of eggs exposed to traveling and standing wave fields. |
Author |
Child SZ, Carstensen EL, Smachlo K. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1980 |
Abstract |
Eggs of the fruit fly, Drosophila melanogaster (wild type), were exposed to 1 MHz traveling and standing wave ultrasound at intensities up to 5 W/cm2. Traveling waves at 3 W/cm2 and ?1 W/cm2 standing wave? killed about one-third of the exposed population. Death occured at the egg stage of development. The study was unable to confirm earlier reports of delayed lethality as a result of exposure to ultrasound in that fraction of the population which survived beyond the egg stage. |
Title |
Effects of ultrasound on Drosophila--II. The heating mechanism. |
Author |
Carstensen EL, Child SZ. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1980 |
Abstract |
An exposure of the eggs of Drosophila melanogaster to a traveling wave of 1 MHz ultrasound at 5 W/cm2 for 30 sec has been found to kill approximately 70% of the population. To determine whether heating could be responsible for this effect, the sensitivity of the eggs to heat alone was tested. Temperature increments attributable to ultrasound were estimated by treating the eggs as heat sources in a thermally conducting medium. The absorption coefficient of the eggs was found to be very large but estimated to be less than 5 nepers/cm. The corresponding maximum temperature increments were calculated to be less than 3 C. This value is far too low to account for the observed effects on the basis of heating. |
Title |
Effects of ultrasound on Drosophila--IV. Pulsed exposures of eggs. |
Author |
Child SZ, Carstensen EL. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1982 |
Abstract |
Drosophila larvae are damaged by exposures to low temporal average intensity pulsed ultrasound with peak intensities of 10-20W/cm2 (2 MHz). Eggs of the same organism are affected by exposures to 3W/cm2 c.w. ultrasound. This experiment shows that eggs become sensitive to high peak intensity (50-100 W/cm2) pulsed ultrasound only shortly before hatching. At this age the larvae have formed and have taken air into the respiratory system. This observation supports the postulate that the sites of action of the ultrasound are the small stabilized gas bodies within the organisms. |
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