microbubbles การใช้

• Octafluoropropane microbubbles reflects sound waves well and are used to improve the ultrasound signal backscatter.
• According to the varying-permeability model, gas bubble nuclei are simply stable microbubbles.
• This technique involves infusing a therapeutic agent along with gas-filled microbubbles into the bloodstream.
• Microbubbles-based contrast media is administrated intravenously in patient blood stream during the medical ultrasonography examination.
• The stability of these microbubbles is due to elastic skins or membranes consisting of surface-active molecules.
• At high enough acoustic intensities, cavitation ( microbubbles forming and interacting with the ultrasound field ) can occur.
• Focused ultrasound, either alone or enhanced by microbubbles and / or thrombolytic agents, can also dissolve blood clots.
• But some of the gas can form microbubbles ( on their own accord or with the help of nucleating sites?
• The researchers have also found that clotting occurs more rapidly if gas-filled microbubbles called ultrasound contrast agents are present.
• The microbubbles being too large in diameter, they stay confined in blood vessels and cannot extravasate towards the interstitial fluid.
• Using injected microbubbles, to lower the threshold for inertial cavitation only at the target, may help reduce damage to adjacent tissues.
• Microbubbles may be used for drug delivery, biofilm removal, membrane cleaning / biofilm control and water / waste water treatment purposes.
• AEA surfactants are added into concrete mixes to impart stable air microbubbles to give air void volumes between ~ 5 %  10 %.
• Once microbubbles have formed, they can grow by either a reduction in pressure or by diffusion of gas into the gas from its surroundings.
• Microbubbles produced in the field oscillate and grow ( due to factors including rectified diffusion ), and can eventually implode ( inertial or transient cavitation ).
• When an unshaken can is opened, the liquid's pressure drops, and the microbubbles are then able to grow in size and leave the liquid.
• The brain damage, researchers suggested, might be caused when small blood vessels in divers'central nervous systems are obstructed by the gas microbubbles that occur during decompression.
• There have been a variety of names used for this ideal standard, such as " microfoam ", " velvet milk ", " microbubbles ", and so forth.
• A contrast medium for medical ultrasonography is a formulation of encapsulated gaseous microbubbles to increase echogenicity of blood, discovered by Dr Raymond Gramiak in 1968 and named contrast-enhanced ultrasound.
• Both techniques smooth out the microscopic eddies that cause turbulent flow, but although both " microbubbles " and artificial mucus reduce drag, these approaches have so far proved impractical for full-size vessels.