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vesicle |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.02 sec. |
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vesicle 1. Pathol a. any small sac or cavity, esp one containing serous fluid b. a blister 2. Geology a rounded cavity within a rock formed during solidification by expansion of the gases present in the magma 3. Botany a small bladder-like cavity occurring in certain seaweeds and aquatic plants vesicle [′ves·ə·kəl] (biology) A small, thin-walled bladderlike cavity, usually filled with fluid. (geology) A cavity in lava formed by entrapment of a gas bubble during solidification. Also known as air sac; bladder; saccus; vacuole; wing. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| If the volatile pressure exceeds the confining pressure of the magma, then vesiculation (bubble nucleation and growth) can occur and the volatile phase is exsolved from the magma. Usually localized at the site of inoculation, CPXV lesions progress from a papule through vesiculation and pustulation into an ulcerative nodule, which is covered with an elevated border with a black eschar. [74,76,79,81,82] Infiltrated leukocytes and endogenous glia, acting as macrophages, mediate tissue damage, including myelin vesiculation and lipid peroxidation, through the generation of a variety of toxic molecules (eg, reactive oxygen and nitrosyl radicals, cytokines and chemokines). |
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