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 results of experiments on the interaction between the sulfide melt of pentlandite composition and graphite are summarized in Table 3. At 6.3 GPa and 1450 Â°C the reaction was slow. In the run MS-1 with duration of 12 h only tiny (5â7 Î¼m) metastable graphite crystals were found on the capsule walls.