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BRL Abstracts Database |
Your search for ultrasound produced 3296 results. Page 231 out of 330
Title |
Some biochemical changes in mouse after in-vivo irradiation of pancreas with ultrasound. |
Author |
Varma BM, Kumar RPS. |
Journal |
Biochem Int |
Volume |
|
Year |
1992 |
Abstract |
875 KHz continuous wave of ultrasound at 2.5 W/Cm2 intensity revealed certain biochemical and enzymological changes in mouse pancreas and liver following the irradiation of pancreas in-vivo for a total of 300 seconds spread over five days. The sacrifice of the animals was carried out on day 0, day 1, day 5 and day 10. Blood glucose was reduced significantly with concomitant increase in liver glycogen. Glucose-6-phosphatase in liver was decreased significantly while glycogen phosphorylase showed marginal variations. Increased calcium pool in pancreas along with Ca+2 activated ATPase was observed. These alterations were prevalent in all the days of sacrifice and also for more than 10 days after the last exposure. The results are suggestive of ultrasound could stimulate the release of pancreatic secretions. |
Title |
Some biological effects of ultrasound. |
Author |
Williams AR. |
Journal |
Thesis(PhD): Univ College of S. Wales and Monmouthshire |
Volume |
|
Year |
1970 |
Abstract |
No abstract available. |
Title |
Some biological effects of ultrasound. |
Author |
Wells PNT. |
Journal |
Thesis(PhD): Univ of Bristol |
Volume |
|
Year |
1966 |
Abstract |
No abstract available. |
Title |
Some effects of ultrasound on guinea-pig ear skin. |
Author |
Carney SA, Lawrence JC, Ricketts CR. |
Journal |
Br J Ind Med |
Volume |
|
Year |
1972 |
Abstract |
No abstract available. |
Title |
Some experiments on the disintegration of yeast by high intensity ultrasound. |
Author |
Neppiras EA, Hughes DE |
Journal |
Biotechnol Bioeng |
Volume |
|
Year |
1964 |
Abstract |
The effects of ambient pressure and ultrasonic power on the disintegration of yeast suspension have been investigated. The results obtained are, in the main, consistent with the theory that cell breakage is primarily a phenomenon dependent on producing gaseous cavitation in the medium. The importance of the experimental results and techniques applied to Commercial cell disintegrators is briefly discussed. A simple flow system is described which is easily attached to probe-type disintegrators. The use of a crystal pickup for tuning and control purposes is described. |
Title |
Some genreral problems of biological action of ultrasound. |
Author |
Sarvazyan AP. |
Journal |
Acad Sci USSR |
Volume |
|
Year |
1981 |
Abstract |
In this report general principals of biological action of ultrasound, dependences of biological effects on intensity, exposure time and temporal characteristics of irradiation are qualitatively considered. The role of dynamic properties and temporal characteristics of living systems in the formation of the response to an external factor is analysed. The factors defining thresholds of biological effects of ultrasound are discussed. |
Title |
Sonar - the story of an experiment. |
Author |
Donald I. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1974 |
Abstract |
No abstract available. |
Title |
Sonic velocity and attenuation in wet compact cow femur for the frequency range 5 to 100 MHz. |
Author |
Lees S, Klopholz DZ. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1992 |
Abstract |
Ultrasonic studies on bone have not been done as intensively as other tissues, probably because there is less opportunity to examine bone previous terminnext term vivo by this modality. There is considerable interest previous terminnext term using ultrasonics to learn about the material properties of bone previous termfornext term which purpose the previous termsonicnext term spectrum may be useful. The longitudinal previous termsonic velocity and attenuationnext term have been found previous termfornext term several sections from one sample of previous termwet cow femur fornext term both the axial and radial directions over the previous termfrequency range of 5 to 100 MHz.next term The basic technique was solid-to-solid contact using a fused quartz buffer rod coupled to the bone specimen. There is clear evidence of previous termvelocitynext term dispersion which Lakes et al. (1986) did not find over a previous termfrequency rangenext term up to 16 previous termMHz.next term While there seems to be a peak previous terminnext term both previous termvelocity and attenuationnext term at 70 previous termMHz,next term it is necessary to obtain measurements at higher previous termfrequenciesnext term to make sure this is not an artifact. The axial previous termsonic velocitynext term varied from 4.29 km/s at previous term5 MHznext term to 4.447 km/s at 50 previous termMHz,next term while the radial previous termvelocitynext term was 3.45 km/s at previous term5 MHznext term and increased to 3.62 km/s at 50 previous termMHz. The attenuationnext term coefficient axially started at a mean value of 3.5 db/mm at previous term5 MHznext term and increased to a mean of 19 db/mm at previous term100 MHz.next term The corresponding radial previous termattenuationnext term coefficients are 5.2 and 26, respectively. |
Title |
Sonically induced microstreaming applied to a surface reaction. |
Author |
Nyborg WL, Gould RK, Jackson FJ, Adams CE. |
Journal |
J Acoust Soc Am |
Volume |
|
Year |
1959 |
Abstract |
Special arrangements are used to produce small-scale eddying near surfaces at which reactions are taking place. Experiments in which the reaction involves a photographic emulsion acted upon by developer show that the development process is considerably accelerated in small areas where the near-surface flow is concentrated. Resonant gas bubbles appear to be by far the most efficient sources of sonically induced microeddying. When such a bubble rests on an emulsion surface the development reaction in its neighborhood is significantly affected, evidently because of the local ?microstirring,? at ambient pressure amplitudes much less than are typically used in sonic and ultrasonic applications. Sonic microstreaming, especially as induced near resonant bubbles at boundaries, appears to be an important mechanism in accounting for certain well known effects of ultrasound. Continued development may lead to means for applying microstreaming to surface processes in a controlled and specifiable manner. |
Title |
Sonochemical activation of hematoporphyrin: An ESR.study. |
Author |
Yumita N, Nishigaki R, Umemura K, Morse PD, Swartz HM, Cain CA,.Umemura S. |
Journal |
Radiat Res |
Volume |
|
Year |
1994 |
Abstract |
The production of 2,2,6,6-tetramethyl-4-piperidone-N-oxyl by reaction of.2,2,6,6-tetramethyl-4-piperidone (TMPone) with ultrasonically generated active species in.oxygenated solutions of hematoporphyrin (Hp) was studied by electron spin resonance.spectroscopy. The nitroxide production rate in air-saturated TMPone solutions in.phosphate-buffered saline of pH 9.0 was significantly higher in the presence of Hp than in its.absence. The enhancement of nitroxide production by Hp was significantly inhibited in the.presence of sodium azide or histidine in the solution. The production rate with Hp was doubled.by substitution of deuterium oxide, while the rate without Hp increased only modestly. These.results suggest that a substantial amount of active oxygen can be generated by ultrasound in.aqueous solutions of Hp. Since the production rate was not reduced by mannitol and no nitroxide.was produced in nitrogen-saturated solutions, it appears that hydroxyl radicals do not account for.a major portion of the active oxygen species which reacted with TMPone to yield a nitroxide. |
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