Qing Tu

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Crumpled graphene films are widely used, for instance in electronics, energy storage, composites and biomedicine. Although it is known that the degree of crumpling affects graphene's properties and the performance of graphene-based devices and materials, the controlled folding and unfolding of crumpled graphene films has not been demonstrated. Here we(More)
Contact resonance AFM (CR-AFM) is a scanning probe microscopy technique that utilizes the contact resonances of the AFM cantilever for concurrent imaging of topography and surface stiffness. The technique has not been used in liquid until recently due to analytical and experimental difficulties, associated with viscous damping of cantilever vibrations and(More)
OBJECTIVE We investigated biological activities, physiological and biochemical properties of two endophytic bacteria isolated from fresh leaves of tea plants. METHOD We did morphological observation, biological activity test, physiological and biochemical assays, 16S rDNA analysis, and compared their genotype and phenotype with those of 13 Herbaspirillum(More)
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