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Vibrational Spectroscopy
Dec. 20, 2010

Vibrational Spectroscopy

Optical spectroscopy offers multiple advantages over other identification techniques because it is highly sensitive to the biochemical nature of materials, can offer great spatial resolution when needed and can be made highly portable. This has made it the technique of choice for multiple applications ranging from remote sensing to disease diagnosis. For instance, needs in remote sensing in the atmosphere or in the battlefield have driven significant developments in devices and techniques using infrared and Raman spectroscopy [1, 2, 3]. more
Expanding Compositional Imaging with AFM
Dec. 20, 2010

Expanding Compositional Imaging with AFM

In atomic force microscopy (AFM) [1] a miniature cantilever with a sharp tip at the end is applied for high-resolution profiling of samples and probing of their local properties. The probe is scanning the sample either in contact or oscillatory mode with the later most applicable to soft materials. High precision scanning and the sensitive detection of tip-sample force enable AFM visualization of surface structures as small as atomic lattices and single molecules. An advantage of the technique is applicability in various environments including liquids and vapors. more
Characterization of Polyethylene Oxide (PEO) Nanofibers by Atomic Force Microscope (AFM)
Dec. 16, 2010

Characterization of Polyethylene Oxide (PEO) Nanofibers by Atomic Force Microscope (AFM)

We investigate the properties of the Polymers nanofibers for its application in the sensors area. Hence, are very important the geometrical, mechanical and electrical properties of the fibers. We produce the fibers by electrospinning; this method is a simple and quick technique for producing fibers with nanoscale diameters from a wide range of materials. In this process, a strong electric field causes a viscous solution to form a Taylor cone, from which a thin fluid jet is formed. This fluid jet may harden by a variety of processes and become a continuous fiber. more
Microscopic Imaging of Rosette Nanotubes
Dec. 13, 2010

Microscopic Imaging of Rosette Nanotubes

The characterization of self-assembled rosette nanotubes (RNTs), which are soft organic nanomaterials, can be challenging because of their small dimensions (diameter 3-8 nm) and their sensitivity to damage by microscopy techniques. Consequently, proper sample preparation and optimized microscopy conditions are necessary for successful characterization. In this paper, the critical factors that strongly affect the quality of the structural information obtained for RNTs are presented (fig. 1) more
To Bead or Not To Bead?
Nov. 26, 2010

To Bead or Not To Bead?

In a large core microscopy facility, instrument performance can decline over time, introducing optical artifacts or distortions into the data. We have selected two commercially available tools which can be used in any facility to monitor changes in optical performance. Using these tools, we have identified objective and alignment problems not visible through typical image collection. A similar approach could be of great benefit to other core microscopy facilities in quality assurance. more
Photocatalytic Systems Films Structure
Nov. 22, 2010

Photocatalytic Systems Films Structure

Photocatalytic systems based on chitosan with different molecular mass with the addition of pluronic and porfirin are very effective in the tryptophan photooxidation. Photocatalytic activity of such systems depended on the molecular mass of chitosan. This effect can be bound up with the unique surface structure features of chitosan-based systems. In this work atomic force microscopy is involved for such systems analisys.

Chitosan‑based Photocatalytic Systems
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Cellular and Nuclear Mechanics
Nov. 13, 2010

Cellular and Nuclear Mechanics

Atomic force microscopy can be used to characterize cells and cell nuclei mechanically under physiological conditions by local indentation. Mechanical properties of cells and cell nuclei reflect the status of the the actin network and the nuclear lamina respectively. For cells, the elastic modulus can be obtained by fitting the non-linear Hertz model to the force indentation curves. In the case of cell nuclei, an effective spring constant can be obtained from a linear fit to the force curves. more
The Neuromuscular Junction in the Amphioxus Myotomes
Nov. 05, 2010

The Neuromuscular Junction in the Amphioxus Myotomes

The peculiar morphology of amphioxus segmental muscles was studied with great interest for more than a century. This was mainly due to the possible relation of the amphioxus to the ancestral chordates and vertebrates [6]. These muscles constitute the bulk of the animal consisting of about sixty V-shaped segments (myomeres or myotomes) separated by thin connective tissue septa called myosepta or myocommata [6, 15]. more
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