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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 101 out of 330
| Title |
Effect of ultrasound on development. Part 1:Introduction and studies in inframammalian.species. Report of the bioeffects committee of the American Institute of ultrasound in medicine. |
| Author |
Sikov MR. |
| Journal |
J Ultrasound Med |
| Volume |
|
| Year |
1986 |
| Abstract |
This report reviews and establishes patterns from the literature on experimental ultrasound exposures of inframammalian embryos and prenatal laboratory mammals. Exposure to ultrasound can produce adverse affects on development, and the sensitivity and responses of the test systems vary with the stage of development. Generally, however, deleterious effects are demonstrable only with exposure parameters that far exceed those used in clinical practice, and the few reports of mammalian embryotoxicity under clinically relevant exposure conditions have not been repeatable. Although it may be impossible to unequivocally establish absolute safety, there is a need for further studies to evaluate subtle and delayed indicators of developmental effects, potential mechanisms, and to attempt to estimate threshold exposure conditions.
|
| Title |
Effect of ultrasound on development. Part 2: Studies in mammalian species and overview. |
| Author |
Sikov MR. |
| Journal |
J Ultrasound Med |
| Volume |
|
| Year |
1986 |
| Abstract |
This report reviews and establishes patterns from the literature on experimental ultrasound exposures of inframammalian embryos and prenatal laboratory mammals. Exposure to ultrasound can produce adverse affects on development, and the sensitivity and responses of the test systems vary with the stage of development. Generally, however, deleterious effects are demonstrable only with exposure parameters that far exceed those used in clinical practice, and the few reports of mammalian embryotoxicity under clinically relevant exposure conditions have not been repeatable. Although it may be impossible to unequivocally establish absolute safety, there is a need for further studies to evaluate subtle and delayed indicators of developmental effects, potential mechanisms, and to attempt to estimate threshold exposure conditions. |
| Title |
Effect of ultrasound on human leucocytes. Sister Chromatid exchange analysis. |
| Author |
Morris SM, Palmer CG, Fry FJ, Johnson LK. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1978 |
| Abstract |
The effect of ultrasound on human leucocytes was examined using the BUDR-Giemsa procedure. Cells were cultured in Minimum Essential Medium (Eagle) with Spinner Salts for 72 hr after irradiation. Sister chromatid exchange (SCE) rate was evaluated in cells irradiated in G(0). No effect on SCE could be demonstrated at any of the ultrasound intensities used (15.3-36 W/cm(2)). |
| Title |
Effect of ultrasound on metabolism of neuroblastoma cells in culture. |
| Author |
Ross P, Yamawaki RM, Rimer VG, Edmonds PD. |
| Journal |
Proc Ultrason Symp IEEE |
| Volume |
|
| Year |
1982. |
| Abstract |
Suspensions of C1300 derived neuroblastoma cells were exposed to 1 MHz CW ultrasound in the near field. Subsequent to exposure, cells were assayed for proliferative capacity, potassium transport (using /sup 86/Rb as a tracer), protein synthesis, and DNA synthesis. Growth rate of cells exposed to 1 W/cm/sup 2/ (I/sub spta/) was not significantly different from control cells. Active transport of /sup 86/Rb was reduced while passive transport increased. Steady state protein synthesis was decreased for intensities of 0.84 W/cm/sup 2/ and 0.98 W/cm/sup 2/. The ratio of de nova protein synthesis to DNA synthesis did not change, but DNA synthesis was slowed. We suspect the proteins synthesized during the lag in DNA synthesis represent a special set of proteins, perhaps necessary for repair of damage. |
| Title |
Effect of ultrasound on tendon extensibility. |
| Author |
Gersten JW. |
| Journal |
Am J Phys Med |
| Volume |
|
| Year |
1955 |
| Abstract |
Studies carried out by Bierman (1) have shown that scars which result in limitation of motion may be satisfactorily treated by ultrasound, with increase in the range of motion. From those observations it was not possible to determine whether temperature changes or mechanical factors played the major role in producing this therapeutic effect. Some information containing this problem may be obtained from observations on the fragmentation of collagenous connective tissue by sonic vibrations at a frequency of 9 kilocycles per second (2,3). Unfortunately, there was no specification as to the intensity used, so that one could not determine whether the dose was within the range used therapeutically. This study was carried out, with relatively low intensities which might be in the range of clinical use, in order to determine the effect of ultrasound on the extensibility of frog Achilles tendon. It was assumed that changes in extensibility would give some indication of how easily scar tissue could be stretched by application of external mechanical forces. |
| Title |
Effect of ultrasound on testicular electrolytes (sodium and potassium). |
| Author |
Fahim MS, Fahim Z, Azzazi F. |
| Journal |
Arch Androl |
| Volume |
|
| Year |
1978 |
| Abstract |
The testes of 50 rats were placed in a cup filled with water and received 1 W/cm2 of ultrasound for 15 min. Fluid was collected from the seminiferous tubules and rete testis of the treated and control groups at 1, 8, 12, and 24 hr intervals. Ultrasound increased the sodium concentration in the fluid of the seminiferous tubules, decreased the sodium concentration in the fluid of the rete testis, increased the potassium concentration in the fluid of the rete testis, and decreased the potassium concentration in the fluid of the seminiferous tubules. Fourteen, slightly sedated, monkeys (Macaca fascicularis) were treated with 1/2 W/cm2 of ultrasound for 30 min. Water was used as the coupling agent for seven monkeys and 3% NaCl was used as the coupling agent for the other seven monkeys. The efficacy of ultrasound treatment in reducing sperm count to zero and achieving zero motility was increased when 3% NaCl was used. Sperm count was at the level of presonication after 20 weeks when water was used as a coupling agent. |
| Title |
Effect of ultrasound on the canine mitral valve. |
| Author |
Reeves MM, Dick LH, McCawley EL. |
| Journal |
Med Res Eng |
| Volume |
|
| Year |
1969 |
| Abstract |
No abstract available. |
| Title |
Effect of ultrasound on the formation of haemopoietic tissue colonies in spleen. |
| Author |
Hrazdira I, Rakova A, Vacek A, Horky D. |
| Journal |
Folia Biol (Praha) |
| Volume |
|
| Year |
1974 |
| Abstract |
The effect of ultrasound on the functional properties of bone marrow cells was studied by the method of formation of exogenous colonies in the spleen of mice, strain C57BL, irradiated by a whole-body exposure of 600 R. The haemopoietic cells, which survived the ultrasound treatment without any morphological changes, produced, in the recipient spleen, a greater number of colonies than unsonicated control cells. The stimulatory effect of low-intensity ultrasound was thus unambiguously proved. |
| Title |
Effect of ultrasound on the pH profiles in the unstirred layers near planar bilayer lipid membranes measured by microelectrodes. |
| Author |
Pohl P, Antonenko YN, Rosenfeld E. |
| Journal |
Biochim Biophys Acta |
| Volume |
|
| Year |
1993 |
| Abstract |
A pH shift in the unstirred layers (USLs) near a planar lipid bilayer membrane was induced by the diffusion of acetic acid along a concentration gradient. By means of a microelectrode technique it was shown that ultrasound decreases the thickness of the USL and that this reduction was much more pronounced on the side facing the ultrasound transducer than on the opposite side of the membrane. The effect depending on sound frequency and pressure is caused by the unidirectional fluid flow built up between transducer surface and membrane, the so-called quartz wind. Theoretical considerations based on the equations of the acoustic streaming near interfaces combined with the diffusion equation allow to predict the thickness of the USL if the sound field parameters are known. |
| Title |
Effect of ultrasound on the tibia of the young rat. |
| Author |
Abramovich A. |
| Journal |
J Dent Res |
| Volume |
|
| Year |
1970 |
| Abstract |
No abstract available. |
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