Microbubbles
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Optimizing dissolved air flotation design system
Dissolved Air (Pressure) Flotation-DAF, is a well-established separation process that employs micro-bubbles as a carrier phase. This work shows results concerning bubble generation at low working pressures in modified DAF-units to improve the collection of fragile coagula by bubbles. DAF of Fe (OH)3 (as model) was studied as a function of saturation pressure
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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14. The use of microbubbles to target drug delivery
Ultrasound-mediated microbubbles destruction has been proposed as an innovative method for noninvasive delivering of drugs and genes to different tissues. Microbubbles are used to carry a drug or gene until a specific area of interest is reached, and then ultrasound is used to burst the microbubbles, causing site-specific delivery of the bioactive materials.
BioMed Central.
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15. Air-filled proteinaceous microbubbles: synthesis of an echo-contrast agent.
Air-filled microbubbles are in clinical use as echo-contrast agents for sonographic applications. The synthesis of aqueous suspensions of air-filled proteinaceous microbubbles involves the ultrasonic irradiation of aqueous protein solutions in the presence of O2. Yields and size distributions of human and bovine serum albumin microbubbles have been determine
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16. Wave scattering from encapsulated microbubbles subject to high-frequency ultrasound: Contribution of higher-order scattering modes
The theoretical understanding of encapsulated microbubble response to high-frequency ultrasound (HFUS) excitation is still limited although some novel experimental HFUS contrast imaging techniques have been well developed. In this paper, the higher-order modal (HOM) contributions to the scattered field are studied for such microbubbles driven by 1–100 MHz
Acoustical Society of America.
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17. Sonoporation by Single-Shot Pulsed Ultrasound with Microbubbles Adjacent to Cells
In this article, membrane perforation of endothelial cells with attached microbubbles caused by exposure to single-shot short pulsed ultrasound is described, and the mechanisms of membrane damage and repair are discussed. Real-time optical observations of cell-bubble interaction during sonoporation and successive scanning electron microscope observations of
The Biophysical Society.
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18. Molecular imaging of endothelial progenitor cell engraftment using contrast-enhanced ultrasound and targeted microbubbles
Oxford University Press.
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19. Renal Ultrafiltration Changes Induced by Focused US1
US bursts combined with microbubbles can temporarily enhance glomerular ultrafiltration and temporarily enable the passage of large-molecule agents that normally are not filtered by the kidneys.
Radiological Society of North America.
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20. Transitory cerebral microvascular blockade after cardiopulmonary bypass.
Dogs were submitted to cardiopulmonary bypass (CPB) carried out under conditions calculated to generate large numbers of microbubbles and microemboli. On the day following the procedure the dogs showed evidence of neurological damage including impaired consciousness and ataxia. These abnormalities largely cleared within a week. When the animals were sacrific
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21. In vivo magnetic resonance vascular imaging using laser-polarized 3He microbubbles
Laser-polarized gases (3He and 129Xe) are currently being used in magnetic resonance imaging as strong signal sources that can be safely introduced into the lung. Recently, researchers have been investigating other tissues using 129Xe. These studies use xenon dissolved in a carrier such as lipid vesicles or blood. Since helium is much less soluble than xenon
The National Academy of Sciences.
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22. Bacterial Stress Responses to 1-Megahertz Pulsed Ultrasound in the Presence of Microbubbles
Members of a panel of stress-responsive biosensors have been used to study the effect of megahertz frequency ultrasound on Escherichia coli. Insonification causes acoustic cavitation, the collapse of oscillating microbubbles in solution, which can damage bacterial cells. A focused 1-MHz ultrasound transducer, capable of generating a spatial peak pulse averag
American Society for Microbiology.
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23. Real-time measurement of renal blood flow in healthy subjects using contrast-enhanced ultrasound
Current methods for measuring renal blood flow (RBF) are time consuming and not widely available. Contrast-enhanced ultrasound (CEU) is a safe and noninvasive imaging technique suitable for assessment of tissue blood flow, which has been used clinically to assess myocardial blood flow. We tested the utility of CEU in monitoring changes in RBF in healthy volu
American Physiological Society.
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24. A bubble-driven microfluidic transport element for bioengineering
Microfluidics typically uses channels to transport small objects by actuation forces such as an applied pressure difference or thermocapillarity. We propose that acoustic streaming is an alternative means of directional transport at small scales. Microbubbles on a substrate establish well controlled fluid motion on very small scales; combinations (“doublet
National Academy of Sciences.