Three-dimensional plasmon rulers     

Liu N  Hentschel M  Weiss T  Alivisatos AP  Giessen H 《Science (New York, N.Y.)》2011,332(6036):1407-1410

Plasmon rulers can be used to determine nanoscale distances within chemical or biological species. They are based on the spectral shift of the scattering spectrum when two plasmonic nanoparticles approach one another. However, the one-dimensionality of current plasmon rulers hampers the comprehensive understanding of many intriguing processes in soft matter, which take place in three dimensions. We demonstrated a three-dimensional plasmon ruler that is based on coupled plasmonic oligomers in combination with high-resolution plasmon spectroscopy. This enables retrieval of the complete spatial configuration of complex macromolecular and biological processes as well as their dynamic evolution.  相似文献   

Molecular recognition by self-assembled monolayers of cavitand receptors     

Schierbaum KD  Weiss T  van Veizen EU  Engbersen JF  Reinhoudt DN  Göpel W 《Science (New York, N.Y.)》1994,265(5177):1413-1415

It is shown by angle-resolved x-ray photoelectron spectroscopy that cavitands derived from resorcin[4]arenes provided with four dialkylsulfide chains form stable monolayers on gold surfaces that are well organized by self-assembly. The cavitand headgroups at the surface of the resorcin[4]arene monolayer act as molecular recognition sites for small organic molecules with remarkable selectivity for perchloroethylene (C(2)Cl(4)). Comparative thermal desorption experiments indicate binding sites with high interaction energies of C(2)Cl(4) at the surface of the resorcin[4]arene monolayers. Fast and reversible "host-guest" interactions were found by the monitoring of extremely small mass changes (in the nanogram range) with a quartz microbalance oscillator provided with gold electrodes coated by resorcin[4]arene monolayers.  相似文献   

Multi-input RNAi-based logic circuit for identification of specific cancer cells     

Xie Z  Wroblewska L  Prochazka L  Weiss R  Benenson Y 《Science (New York, N.Y.)》2011,333(6047):1307-1311

  相似文献   

Lessons from science communication training     

Warren DR  Weiss MS  Wolfe DW  Friedlander B  Lewenstein B 《Science (New York, N.Y.)》2007,316(5828):1122

  相似文献   

European Space Agency. ESA and the European Union: a marriage made in the heavens?     

Weiss G 《Science (New York, N.Y.)》2003,300(5619):571-572

  相似文献   

Scientific lives. Reflected glory: life with a Nobelist parent     

Weiss G 《Science (New York, N.Y.)》2004,303(5665):1758-1759

  相似文献   

THE BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE ADDRESS TO THE BOTANICAL SECTION     

Weiss FE 《Science (New York, N.Y.)》1911,34(876):464-480

  相似文献   

Asteroid 21 Lutetia: low mass, high density     

Pätzold M  Andert TP  Asmar SW  Anderson JD  Barriot JP  Bird MK  Häusler B  Hahn M  Tellmann S  Sierks H  Lamy P  Weiss BP 《Science (New York, N.Y.)》2011,334(6055):491-492

Asteroid 21 Lutetia was approached by the Rosetta spacecraft on 10 July 2010. The additional Doppler shift of the spacecraft radio signals imposed by 21 Lutetia's gravitational perturbation on the flyby trajectory were used to determine the mass of the asteroid. Calibrating and correcting for all Doppler contributions not associated with Lutetia, a least-squares fit to the residual frequency observations from 4 hours before to 6 hours after closest approach yields a mass of (1.700 ± 0.017) × 10(18) kilograms. Using the volume model of Lutetia determined by the Rosetta Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) camera, the bulk density, an important parameter for clues to its composition and interior, is (3.4 ± 0.3) × 10(3) kilograms per cubic meter.  相似文献   

SCHOOL GRADES--TO WHAT TYPE OF DISTRIBUTION SHALL THEY CONFORM?     

Weiss AP 《Science (New York, N.Y.)》1912,36(926):403-407

  相似文献   

Genetic diversity and a PCR-based method for Xanthomonas axonopodis detection in passion fruit     

Munhoz CF  Weiss B  Hanai LR  Zucchi MI  Fungaro MH  Oliveira AL  Monteiro-Vitorello CB  Vieira ML 《Phytopathology》2011,101(4):416-424

Xanthomonas axonopodis pv. passiflorae causes bacterial spot in passion fruit. It attacks the purple and yellow passion fruit as well as the sweet passion fruit. The diversity of 87 isolates of pv. passiflorae collected from across 22 fruit orchards in Brazil was evaluated using molecular profiles and statistical procedures, including an unweighted pair-group method with arithmetical averages-based dendrogram, analysis of molecular variance (AMOVA), and an assigning test that provides information on genetic structure at the population level. Isolates from another eight pathovars were included in the molecular analyses and all were shown to have a distinct repetitive sequence-based polymerase chain reaction profile. Amplified fragment length polymorphism technique revealed considerable diversity among isolates of pv. passiflorae, and AMOVA showed that most of the variance (49.4%) was due to differences between localities. Cluster analysis revealed that most genotypic clusters were homogeneous and that variance was associated primarily with geographic origin. The disease adversely affects fruit production and may kill infected plants. A method for rapid diagnosis of the pathogen, even before the disease symptoms become evident, has value for producers. Here, a set of primers (Xapas) was designed by exploiting a single-nucleotide polymorphism between the sequences of the intergenic 16S-23S rRNA spacer region of the pathovars. Xapas was shown to effectively detect all pv. passiflorae isolates and is recommended for disease diagnosis in passion fruit orchards.  相似文献