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nanotimes News in Brief

A. R. Stefankiewicz and J. K. M. Sanders at Uni- versity Chemical Laboratory, UK, published in Sci- ence an article to “Harmony of the Self-Assembled Spheres”. A. R. Stefankiewicz and J. K. M. Sanders: Harmony of the Self-Assembled Spheres, In: Science, Vol. 328(2010), No. 5982, May 28, 2010, Pages 1115-1116, DOI:10.1126/ science.1190821:

http://dx.doi.org/10.1126/science.1190821

J. A. Fan et al. created a hierarchy of nanoscale optical structures from nanoparticles that have metal shells and dielectric cores. The new types of chemically synthesized nanoparticle clusters can be generalized to other two- and three-dimensional structures and can serve as building blocks for new metamaterials. Jonathan A. Fan, Chihhui Wu, Kui Bao, Jiming Bao, Rizia Bardhan, Naomi J. Halas, Vinothan N. Manoharan, Peter Nordlander, Gennady Shvets, Federico Capasso: Self- Assembled Plasmonic Nanoparticle Clusters, In: Science, Vol. 328(2010), No. 5982, May 28, 2010, Pages 1135- 1138, DOI:10.1126/science.1187949: http://dx.doi.org/10.1126/science.1187949

Researchers at European Bioinformatics Institute, U.K., Genentech, Inc., USA, and European Mole- cular Biology Laboratory, Germany, describe in PNAS that an independent filtering increases de- tection power for high-throughput experiments. The use of some filter/test statistics pairs presented in the literature may, however, lead to loss of type I error control. They describe other pairs which avoid this problem. In an application to microarray data, they found that gene-by-gene filtering by overall va-

10-05/06 :: May/June 2010

riance followed by a t-test increased the number of discoveries by 50%. They also show that this parti- cular statistic pair induces a lower bound on fold- change among the set of discoveries. Independent filtering – using filter/test pairs that are independent under the null hypothesis but correlated under the alternative – is a general approach that can sub- stantially increase the efficiency of experiments. © PNAS

Richard Bourgon, Robert Gentleman, and Wolf- gang Huber: Independent filtering increases detec- tion power for high-throughput experiments, In: PNAS, Vol.107(2010), No. 21, Pages 9546-9551, DOI:10.1073/ pnas.0914005107:

http://dx.doi.org/10.1073/pnas.0914005107

Researchers at Department of Chemistry and Biochemistry, Department of Materials Science and Engineering, California Nanosystems Institute, University of California, USA, presented in Nano Letters their work to “Rational Design and Synthe- sis of Freestanding Photoelectric Nanodevices as Highly Efficient Photocatalysts”.

They report the rational design and synthesis of a new generation of standalone photoelectric nano- devices as highly efficient and stable photocatalysts by hetero-integrating a nanoscale photodiode with two redox catalysts in a single nanostructure. This design offers several significant advantages, inclu- ding (1) Efficient charge separation with built-in electric field; (2) Efficient charge transportation in 1D minimizes recombination; (3) Insulator encap- sulation ensures stability; (4) The ensured stability allows for flexible selection of semiconductors; and (5) it may also offer the potential to integrate mul-

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