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
292. Chain Dynamics 2. Eliminate or decrease the decline in the coefficient of friction by using abearing roller (please consult with manufacturer if the speed is less than 2m/min.), or use a special kind of lubrication oil (Tsubaki special oil, orothers).