noun, Biology. 1. an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement. Origin of tropism. 1895-1900. First recorded in 1895-1900; independent use of -tropism. Related forms. tropismatic.
Friction on as-grown graphene (Fig. 1c) is ultra-low and rather uniform with its magnitude close to the previous reports4. In contrast, friction on graphene after ï¬uorination becomes
The conductivity of graphite powder. 2013-07-16 15:32:58. Graphite powder is one kind of graphite dark gray solid with a metallic sheen and opaque sweetlips flakes. Graphite powder is very soft, creamy, with excellent conductive properties.