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twinning |
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twinning [′twin·iŋ] (crystallography) The development of a twin crystal by growth, translation, or gliding. Twinning (crystallography) A process in which two or more crystals, or parts of crystals, assume orientations such that one may be brought to coincidence with the other by reflection across a plane or by rotation about an axis. Crystal twins represent a particularly symmetric kind of grain boundary; however, the energy of the twin boundary is much lower than that of the general grain boundary because some of the atoms in the twin interface are in the correct positions relative to each other. See Grain boundaries
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| However, she asserts, physicians would detect the tiny genetic difference only in the rare instance when the mutation responsible for twinning happened to disrupt a crucial gene, leading to a disease in one twin but not in the other. |
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