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BRL Abstracts Database |
Your search for ultrasound produced 3296 results. Page 100 out of 330
Title |
Effect of pulsed low-power ultrasound on.growing tissues. II. Malignant tissues. |
Author |
Pizzarello DJ, Vivino A, Newall J, Wolsky A. |
Journal |
Exp Cell Biol |
Volume |
|
Year |
1978 |
Abstract |
Pulsed ultrasound at 2.25 MHz was delivered by a transducer having an average.power output of 1.5 mW to a transplantable mouse lymphosarcoma for 5 min. The.transplantability of the tumor was reduced. No change in mitotic index as a result of.insonation was noted. |
Title |
Effect of pulsed ultrasound exposure on.development of early embryos. |
Author |
Iwabe T. |
Journal |
Nippon Sanka Fujinka Gakkai Zasshi |
Volume |
|
Year |
1993 |
Abstract |
Ultrasonography is indispensable for medical treatment, particularly in the field.of reproductive medicine. Therefore, it is important to confirm safety when.exposing preimplantation embryos to ultrasound. For this purpose, the study.was designed to elucidate the bioeffects of pulsed ultrasound on preimplanted.mice embryos. One-cell stage embryo, 2-cell stage embryo, morula and.expanded blastocysts of mice in vitro cultured were exposed to experimental.pulsed ultrasound for 15 minutes in degassed water at 37 degrees C. The.ultrasound used in this study was 2MHz; [spatial-average temporal-average.intensity (ISATA): 120mW/cm2, maximum intensity (Im): 39.1W/cm2, the peak.rarefactional pressure (Pr): 1.0MPa, pulse width: 10 mus' and pulse repetition.frequency: 1.0kHz.]. The development to expanded blastocyst and the nucleic.acid synthesis in expanded blastocyst were compared in the embryos exposed.(study group) and those not exposed (control) to the ultrasound. There were no.significant differences between the two groups in the rates of development to.expanded blastocysts and the nucleic acid synthesis. The temperature of the.irradiated medium in cell container straw did not rise. These results suggest that.pulsed ultrasound at the intensity used in this study does not have a harmful.effect on early preimplantation embryos. . |
Title |
Effect of therapeutic ultrasound on endochondral ossification. |
Author |
Wiltink A,Nijweide PJ,Oosterbaan WA,Hekkenberg RT,Helders PJM. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1995 |
Abstract |
The effect of therapeutic doses of ultrasound was tested on endochondral ossification of in vitro developing metatarsal long bone rudiments of 16- and 17-day-old fetal mice. Bone growth, calcification and resorption following exposure to several doses of pulse-wave (PW) or continuous-wave (CW) ultrasound were examined. PW was applied at intensities between 0.1 W cm-2 and 0.77 W cm-2 (I satp) and CW intensities were 0.1 W -2 or 0.5 W -2 (Isata). After 1 week of culture, the metatarsal long bone rudiments were fixed and paraffin sections were prepared for histological evaluation and for measurement of the relative contribution of the various cartilage zones to the total bone length. In contrast to treatment with CW ultrasound, treatment of 16-day-old metatarsal long bone rudiments with PW ultrasound resulted after 4 days of culture in significantly increased longitudinal growth. Histology revealed a significant increased length of the proliferative zone, whereas the length of the hypertrophic cartilage zone was unaltered. This might indicate that proliferation of the cartilage cells is stimulated without influence on cell differentiation. |
Title |
Effect of therapeutic ultrasound on the healing of full-thickness excised skin lesions. |
Author |
Young SR, Dyson M. |
Journal |
Ultrasonics |
Volume |
|
Year |
1990 |
Abstract |
Abstract not available. |
Title |
Effect of ultrasonic attenuation on the feasibility of acoustic tweezers. |
Author |
Lee J, Shung KK. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
2006 |
Abstract |
A modified mathematical formulation for the calculation of axial radiation force was developed to incorporate the effect of ultrasonic attenuation. Axial forces, Fresnel coefficients, average internal attenuation factors and effective internal reflection coefficients were calculated. Thermal and mechanical indices were also computed to address the safety issues in the implementation of acoustic tweezers and were found to be negligible. The results show that the overall distribution of axial forces is barely affected by attenuation. Furthermore, it is found that attenuation actually works against the scattering force and may therefore reinforce the axial trapping force. For a particle size of 180 microm, the maximum trapping force increases from 29.8 x 10(-11) N to 30.3 x 10(-11) N by 1.7% when attenuation is included. In light of these results, it appears that acoustic tweezers may still be feasible beyond the focal point even under the influence of attenuation. |
Title |
Effect of ultrasound and cytochrome-C on the functional disorders of Corti's organ and cochlear nerve in animals. |
Author |
Preibisch-Effenberger R, Freigang B, Seidel P, Ziemski Z, Reczek-Krauss H. |
Journal |
Otolaryngol Pol |
Volume |
|
Year |
1970 |
Abstract |
No abstract available. |
Title |
Effect of ultrasound on a bilayer lipid membrane. |
Author |
Rohr KR, Rooney JA. |
Journal |
Biophys J |
Volume |
|
Year |
1978 |
Abstract |
The effects of continuous wave ultrasound at a frequency of 1 MHz in the intensity range of 0-1.4 W/cm2 on an oxidized cholesterol bilayer lipid membrane (BLM) were observed. Ultrasound at 1.5 W/cm2 broke the membrane; in the range from.0.5 to 1.4 W/cm2, it accelerated the draining of the bulk lipid solution from the annulus to the Teflon support. At all intensities it has no effect on the conductance, the capacitance, or the dependence of each on the voltage applied across the.membrane. Electrical parameters were measured in the presence of aqueous solutions of NaCl, KCl, and distilled water. The motivation and results of this project are explained in relation to an overall objective of determining the specific effects of.ultrasound on biological membranes. |
Title |
Effect of ultrasound on arterial morphology. |
Author |
Eggleton RC, Fallon JT, Stehbens WE. |
Journal |
Proc Twenty-fourth ACEMB - Las Vegas |
Volume |
|
Year |
1971 |
Abstract |
The effect of high intensity focused ultrasound on the structure of arterial walls has been investigated and compared with earlier studies on brain and muscle tissue. Photomicrographs of lesions show morphological changes in structure of the vessel wall. Increased intracellular vacuolation, as well as interstitial fluids, are found for rabbits sacrificed at 30 hrs. and 72 hrs. Changes in structure for the animals sacrificed at one hr. are either not detectable or are very minimal. |
Title |
Effect of ultrasound on arteries. |
Author |
Fallon JT, Stehbens WE, Eggleton RC. |
Journal |
Arch Pathol |
Volume |
|
Year |
1972 |
Abstract |
A technique for the production of ultrasonic lesions in arterial tissue was developed and the lesions so produced were investigated morphologically. Focused ultrasoudn (1MHz) at intensities of 25, 100, and 1,500 w/sq cm was applied to the central arteries of rabbits' ears. The maximum duration of exposure to these intensities was 720, 40, 1.5, and 0.1 seconds, respectively. The rise in temperature associated with the dosages was determined with an implanted thermocouple. The tissues were examined at 1, 30, and 72 hours after sonication. Focal lesions were found in the exposed arterial wall at intensity levels and pulse durations corresponding to threshold values of mammalian nervous tissue. The lesions in the arterial wall consisted of vacuolation, degeneration, and necrosis of smooth muscle cells in the media, loss of endothelium, and infiltration of the media with inflammatory cells. |
Title |
Effect of ultrasound on bone marrow cell suspensions in vitro. |
Author |
Hrazdira I, Bilkova B |
Journal |
Folia Biol |
Volume |
|
Year |
1963 |
Abstract |
No abstract available. |
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