Science, October 19, 2007

Cover
Structure of a gold nanoparticle in which the central atoms are packed in a decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. Gold atoms, gold; sulfur atoms, blue; carbon atoms, white; oxygen atoms, red; the superimposed red mesh depicts the electron-density distribution determined by x-ray crystallography.

Mitochondrial DNA as a Genomic Jigsaw Puzzle
The mitochondrial genes of the unicellular eukaryote Diplonema are fragmented among many small chromosomes, and their coding RNAs are pieced together to form messenger RNAs.

Mass-Dependent and -Independent Fractionation of Hg Isotopes by Photoreduction in Aquatic Systems
The odd isotopes of mercury are fractionated in a mass-independent manner during photoreduction, providing a tracer of mercury species and reactions through food webs.

Paired-End Mapping Reveals Extensive Structural Variation in the Human Genome
Sequencing of structure variations over segments of DNA from two individuals of different ethnic groups showed unexpected levels of diversity.

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