STM/STS study of bimetallic nanostructures on silicon surfaces

In this study we examine linear nanostructures consisting of metals of III. (Al, In) and IV. (Sn) group on the Si(001)2×1 surface by means of scanning tunnelling microscopy & spectroscopy. Atoms on the surface align into atomic chains growing perpendicularly to the dimer rows of the surface reconstruction. The chain structure consists of dimers that adsorb in the troughs between the dimer rows of the surface reconstruction. We observe that the chains consist of sequences of homodimers of either elements combining with heterodimers. The InSn chain structure is analysed with regard to theoretical ab-initio calculations of the chain dimer structure. The model is then applied to the Al-Sn system. We observe that the Al-Sn chains tend to consist of aligned heterodimers. The appearance of heterodimers in STM depends on the chemical composition of the neighbouring dimers. We can also observe the tendency of chains to agglomerate and via Sn atoms create quasi periodic 2D structures. The electronic structure of an Al, Sn and mixed AlSn dimer is studied by means of tunnelling spectroscopy. Despite its small, nonzero density of states on the Fermi energy, the character of the mixed dimer appears to be rather non-conductive

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Alignment of L1 ORF2 endonuclease domains from several orders within the Supraprimate clade of mammals. The amino acid sequence of the endonuclease domains of species from various mammalian orders were aligned using the Clustal W method. Residues conserved relative to the human L1 endonuclease sequence are shaded in red. Boxes indicate putative phosphorylation sites of interest. (PNG 13086 kb

Additional file 10: Table S4. of The endonuclease domain of the LINE-1 ORF2 protein can tolerate multiple mutations

Sequences of primers used in this study for site-directed mutagenesis. (XLSX 9 kb