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Combined Holographic Optical Trapping and Imaging
Aug. 07, 2013

Combined Holographic Optical Trapping and Imaging

We combined holographic optical tweezers (HOT) with self-interference digital holographic microscopy (DHM). HOT allow flexible three-dimensional contactless moving of particles inside cells and positioning of bacteria on host cells while self-interference DHM provides simplified multi-focus quantitative phase imaging and 3D object tracking. Our results demonstrate novel ways for the analysis of the intracellular morphology and modeling of infection scenarios at single cell scale. more
Polarization and Nonlinear Microscopy
Aug. 06, 2013

Polarization and Nonlinear Microscopy

2-photon imaging of collagen-based biological tissues might benefit from the choice of particular incident polarization states. Here we further explore the effects of polarization on the visualization of ocular structures. Theoretical and experimental results suggest that linear polarization optimizes the imaging of samples containing mostly parallel elongated structures. However this type of polarization might not be the most appropriate when tissues present random distributed collagen patterns.
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Two Microscopes Integrated in One
Aug. 01, 2013

Two Microscopes Integrated in One

A high-NA light microscope can be retro-fitted onto a Scanning Electron Microscope giving the possibility to perform simultaneous high-resolution fluorescence and electron microscopy on the same area of a sample. more
In Situ Molecular Microscopy
Jul. 31, 2013

In Situ Molecular Microscopy

We present a novel approach for visualizing viral assemblies in liquid using transmission electron microscopy (TEM). We utilize a microfluidic chamber that fits within a TEM specimen holder and while inserted in the column, is completely isolated from the vacuum. This configuration proves suitable for imaging and reconstructing viral complexes in solution at 2.5-nanometer resolution. more
Nano-Mechanics on Skin Tissue
Jul. 29, 2013

Nano-Mechanics on Skin Tissue

Following traumatic injury, skin has the capacity to repair itself through complex biochemical changes. The dermis is remodeled over time affecting its mechanical behavior. AFM nanoindentation showed that the scar tissue exhibits stiffer behavior than healthy skin. Scar tissue shows weaker visco-elastic creep and reduced capability to dissipate energy at physiological frequencies than adjacent intact skin. AFM imaging showed a distinct orientation of collagenous fibrils in the scar tissue. more
Focused Ion Beam Ablation Tomography
Jul. 22, 2013

Focused Ion Beam Ablation Tomography

We explore the potential of a novel imaging method to exploit differential susceptibility of biological tissue to erosion by Focused Ion Beam (FIB) milling. The contents of a given cell (nucleus, Golgi apparatus, vacuoles) have different physical compositions and will ablate differentially under the ion beam. Sequential fine slices of frozen cells have been ablated, after which slice-by-slice image analysis of the extracted ablation vectors is back-converted to a FIB susceptibility parameter. more
An Imaging Modality for Ultrahigh Accuracy Estimation
Jul. 09, 2013

An Imaging Modality for Ultrahigh Accuracy Estimation

The extraction of quantities from image data represents a common yet powerful way of obtaining information about the imaged objects. In the last decade or so, it has come to play an important role in single molecule microscopy data analysis, where attributes of a fluorescent molecule such as its location need to be estimated accurately from an image. Different estimators can be used to determine the quantities of interest with varying levels of accuracy. However, even when an accurate estimator is used, the obtainable accuracies are fundamentally limited by the fact that the estimation is carried out on image data that has been deteriorated by pixelation and detector noise. We describe here an imaging method that produces image data from which quantities of interest can be estimated with accuracies significantly higher than those that could be expected when the quantities are estimated from conventionally acquired image data. Focus is given to a particular implementation that minimizes the deteriorative effects of both pixelation and detector noise.
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CLEM on Ultrathin Sections
Jun. 18, 2013

CLEM on Ultrathin Sections

Correlative light and electron microscopy (CLEM) combines the versatility of fluorescence microscopy (FLM) with the spatial resolution of transmission electron microscopy (TEM). For the analysis of tissues single resin or cryo-sections are incubated with fluorochrome- and gold-labeled probes. Areas of interest are selected at the FLM, and analyzed in the TEM at high resolution. This way, fluorescence is directly correlated to subcellular structures and/or corresponding immunogold signals.
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