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Pixel-Wise Fitting
Jun. 11, 2013

Pixel-Wise Fitting

For excitable cells in which signaling events occur in milliseconds, a mathematical formalism for pixel-wise fitting generates virtually pixel noise-free image sequences from high-speed 2-dimensional confocal data. This approach provides novel insight into cardiac excitation-contraction coupling and its pathophysiology. Such an analytical approach can be extended into other biological systems to uncover otherwise inaccessible features of subcellular signal transduction in living cells. more
Self-Organized Gold Honeycomb Structure
Jun. 07, 2013

Self-Organized Gold Honeycomb Structure

The early growth stage and growth evolution to a unique gold (Au) honeycomb nano-network on Si(111)7×7 at room temperature have been studied by direct filled-state and empty-state imaging by scanning tunneling microscopy (STM). The gold honeycomb structure is made up of six triangular gold clusters around the corner hole interconnected to one another in the dimer rows of the Si(111)7×7 substrate. more
Patchwork Membrane in Budding Yeast
Apr. 29, 2013

Patchwork Membrane in Budding Yeast

The plasma membrane (PM) is a selective barrier that separates cells from their environment and acts as signalling platform. Many PM proteins localize into characteristic domains but the molecular basis for their segregation is under debate. Using a combination of total internal reflection fluorescence microscopy and 2D deconvolution we visualized a large set of PM proteins in budding yeast. We found that the yeast PM self-organizes into numerous domains through weak protein-lipid interactions. more
Infrared Images of Single Electrons
Apr. 22, 2013

Infrared Images of Single Electrons

Scattering-type near-field optical microscopy (s-SNOM) is a powerful technique to image nano objects. It can be employed in a broad spectral range, namely the complete infrared region spanning from the terahertz range up to the visible range. In this article we describe a system which utilizes a free-electron laser as a spectrally narrow and widely tunable source of infrared radiation. This system was employed to study electrons confined in self-assembled InAs quantum dots. We spatially resolved single quantum dots upon resonant excitation of transitions between discrete energy levels of the confined electrons.
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Targeted Subcellular Nanoanalysis
Apr. 16, 2013

Targeted Subcellular Nanoanalysis

We developed a new approach using cryo-correlative light and scanning transmission electron microscopy allowing analysis of targeted in situ intracellular ions and water measurements at the ultrastructural level within domains identified by examination of specific GFP-tagged proteins [1]. We illustrate the potential of this approach by investigating changes in water and ion content in nuclear domains identified by GFP-tagged proteins in cells stressed by Actinomycin D treatment and controls. more
Scanned LSFM with Confocal Detection
Apr. 08, 2013

Scanned LSFM with Confocal Detection

Light sheet fluorescence microscopy (LSFM) is a technique with a vivid development [1, 2]. In contrast to epi-illumination microscopy the sample is illuminated with a thin light sheet orthogonally to the detection path. Most often the sheet is formed by rapidly scanning a laser beam across the sample. This illumination yields intrinsic optical sectioning and reduction of photobleaching and phototoxicity since excitation is limited to fluorophores inside the observation plane. This is particularly beneficial for long term imaging in developmental biology and reduces image background [3-5].
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Molecularly Resolved Cellulose Nitrate
Apr. 02, 2013

Molecularly Resolved Cellulose Nitrate

The development of nanostructured lacquers and propellants needs to master the cellulose nitrate processing on the nanoscale. The challenge is the deposition of single cellulose nitrate molecules to image them with molecular resolution. We report on the effect of solvent, shaking duration and deposition techniques, from which the spray technique succeeded, for the first time to our knowledge, to image by Atomic Force Microscopy, individual molecular cellulose nitrate polymeric chains.
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Nano-FTIR - The Chemical Nanoscope
Mar. 25, 2013

Nano-FTIR - The Chemical Nanoscope

We show identification of chemical compounds and chemical maps at 20 nm resolution, enabled by a novel combination of infrared spectroscopy and near-field microscopy. Nano-FTIR returns the surface topography and simultaneously the local mid-infrared spectrum of the tiny volume (20 nm3) just below the probing tip thus allowing correlative topography/hyperspectral infrared images. In the case of molecular substances, comparison with common infrared databases enables local chemical recognition.
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