26 research outputs found
A complex comprising a cyanine dye rotaxane and a porphyrin nanoring as a model lightâharvesting system
A nanoringârotaxane supramolecular assembly with a Cy7 cyanine dye (hexamethylindotricarbocyanine) threaded along the axis of the nanoring was synthesized as a model for the energy transfer between the lightâharvesting complex LH1 and the reaction center in purple bacteria photosynthesis. The complex displays efficient energy transfer from the central cyanine dye to the surrounding zinc porphyrin nanoring. We present a theoretical model that reproduces the absorption spectrum of the nanoring and quantifies the excitonic coupling between the nanoring and the central dye, thereby explaining the efficient energy transfer and demonstrating similarity with structurally related natural lightâharvesting systems
Super-resolution RESOLFT microscopy of lipid bilayers using a fluorophore-switch dyad
Dyads consisting of a photochromic switch covalently linked to a fluorescent dye allow the emission from the dye to be controlled by reversible photoisomerization of the switch; one form of the switch quenches fluorescence by accepting energy from the dye. Here we investigate the use of dyads of this type for super-resolution imaging of lipid bilayers. Giant unilamellar vesicles stained with the dyads were imaged with about a two-fold resolution-enhancement compared with conventional confocal microscopy. This was achieved by exciting the fluorophore at 594 nm, using a switch activated by violet and red light (405/640 nm)
Exposing Preschool Children to Counterstereotypical Professional Role Models Using Audiovisual Means: A Small Study in a Preschool in Greece
Creating infinite contrast in fluorescence microscopy by using lanthanide centered emission
Pelvic floor muscle knowledge and relationship with muscle strength in Brazilian women: a cross-sectional study
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Cross section for b b¯ production via dielectrons in d + Au collisions at sNN =200 GeV CROSS SECTION for b b¯ PRODUCTION VIA ⯠A. ADARE et al.
We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in d+Au collisions at sNN=200 GeV. By exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to pythia and mc@nlo simulations. The resulting bbÂŻ-production cross section is ÏbbÂŻdAu=1.37±0.28(stat)±0.46(syst) mb, which is equivalent to a nucleon-nucleon cross section of ÏbbNN=3.4±0.8(stat)±1.1(syst)ÎŒb