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bead expander

bead expander — A device used in the mounting of tubeless tires to prevent inflation air from escaping and bring the tire beads against the tapered bead seat area (rim) … Dictionary of automotive terms
expander — [1] A ring placed under a piston ring to increase ring pressure on the cylinder walls. For instance an oil control ring may have an expander ring to assist the oil control ring to scrape oil off the cylinder wall and provide further sealing. See… … Dictionary of automotive terms
Optical tweezers — (originally called single beam gradient force trap ) are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch… … Wikipedia
dextran — 1. Any of several water soluble high molecular weight glucose polymers (average MW 75,000; ranging between 1,000 and 40,000,000) produced by the action of members of the family Lactobacillaceae and certain other microorganisms on sucrose; used in … Medical dictionary
Dextran — Identifiers CAS number 9004 54 0 … Wikipedia