J Biomed Nanotechnol 2010,6(6):694–703.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions LAF carried out the synthesis and characterization of the fluorescent triglyceride and the preparation and characterization of the fluorescent nanoparticles, performed the cell uptake and the fluorescence microscopy studies, and performed the interpretation of data and manuscript writing. RVC participated in the synthesis and characterization of the fluorescent triglyceride and contributed to the design of experiments, interpretation of data, and manuscript

drafting. JFB participated in the characterization PF-3084014 molecular weight of the fluorescent triglyceride and in the preparation and characterization of the fluorescent nanoparticles. FF carried out the cell culture and helped in the design and performance of the cell uptake and the fluorescence microscopy studies. AMOB conceived the study regarding the cell culture, cell uptake, and fluorescence microscopy. SSG conceived the study regarding the nanoparticle physico-chemical characterization and participated in the interpretation of data. ARP conceived the study and participated find protocol in its design,

coordination, and result interpretations. All authors read and approved the final manuscript.”
“Background Single-atom manipulation, which was first introduced by Eigler et al. and realized experimentally on Ni (111) surface with a scanning tunneling

microscope (STM) tip, provides a way to fabricate nanostructures with atomic precision [1–7]. Besides the STM tip, for nonconductive surface, the tip of an atomic force microscope (AFM) has also been applied to achieve various single-atom manipulations [8–10]. Studies show that merely by the mechanical interaction force acting between the tip and atom, complex manipulations can still be accomplished besides the primary lateral and vertical manipulations. For instance, on Al (111) surface, Ribonuclease T1 a reversible modification of the configuration of supported nanoclusters with atomic precision by tip was demonstrated in our previous simulations [11]. Also, the work on Si (111) surface given by Sugimoto et al. shows that an atom from the AFM tip can interchange with a surface adatom in a reversible exchange procedure [9]. Through this vertical manipulation, a single Si atom can be precisely positioned into or extracted from the Sn layer. As the size of devices shrinks to nanoscale or even to atomic scale, besides configuration of nanostructure, the number of isolated atoms of certain click here species and their location could modify their functionality and performance [12, 13]. Therefore, it is sometimes demanded to position dopants at certain sites precisely.