Jul. 05, 2011
Since their discovery in 1896 , x-rays have fundamentally revolutionized science, medicine and technology. Each successive generation of x-ray machines has opened up new frontiers in science, such as the first radiographs and the determination of the structure of DNA. State-of-the-art x-ray sources, such as synchrotrons, can now produce coherent high-brightness beams of x-rays with energies greater than kiloelectronvolt, which promise a new revolution in imaging complex systems on the nanometer and femtosecond scale. moreJun. 20, 2011
In order for nanotechnology, photonics and single-molecule spectroscopy to meet, structures with defined molecular compositions with dimensions in the 1-100 nm range are required. With the aid of DNA, nanostructures were constructed that guide light in switchable directions using multistep FRET from an input dye to an output dye. The direction of FRET is controlled by a jumper dye. moreMay. 31, 2011
3D Image Acquisition: In fluorescence microscopy, various types of microscopes and digital imaging methods are increasingly used to image samples in three dimensions at highest possible resolution. This is technically achieved by layering images, which are taken at a fixed sample location but at different heights on top of each other.
Improvements in Depth Resolution moreMay. 30, 2011
Synapses are the switch-points in our brain for information transmission, learning and memory. And there is evidence to suggest that changes and malfunctions in synapses are partly responsible for a number of neurological and psychological disorders. Neuroscientists already know a lot about how signals are transmitted from neuron to neuron. Yet many synaptic processes are still not fully understood. Dr. moreMay. 26, 2011
Historically, electron microscopy of dynamic biological processes has been impossible to achieve in real time because conventional electron microscopy requires specimen fixation, dehydration and metallic coating. The advent of the Environmental Scanning Electron Microscope (ESEM) removed these restrictions, allowing fully hydrated samples to be imaged in their native state. This raises the possibility of secondary electron imaging of dynamic biological processes.
Well Suited to Biological Imaging moreMay. 13, 2011
The small size of micro- and nano-structures makes tensile testing challenging. In this study we meet this challenge by combined use of a Focussed Ion Beam (FIB) in Dual Beam configuration, an AFM-cantilever, and a micromanipulator which provide the required accuracy and versatility to measure the mechanical properties of nanowires by tensile testing. AFM cantilevers with a big range of force constants principally enable us to measure the tensile behavior of a great variety of materials. moreMay. 12, 2011
We report on the development of a Hyperbaric Atomic Force Microscopy (HAFM) imaging system. Initial system performance is provided and cantilever dynamics are investigated. HAFM results of human fibroblasts and rat hippocampal neurons under graded levels of hyperbaric gases (up to 6 atmospheres absolute; ATA) are shown. Hyperbaric AFM provides the capability to study the cellular and molecular mechanisms of pressure-dependent disorders. moreMay. 04, 2011
A laser scanning microscope collects information from a thin focal plane, disregarding out-of-focus information. It has become the standard imaging method to characterise cellular morphology and structures, both in static and living samples. Laser scanning microscopy at high resolution combined with digital image restoration is also a powerful tool to analyse intracellular localisation of fluorescently labelled nanoparticles (NPs), such as their colocalisation within membrane-bound compartments (e.g. more