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Raman Spectroscopy

Micro-Raman spectroscopy and an advanced universal fibre tester were used to probe at the nanoscale the change in conformation, macromolecular fibroin chain orientation and coupling during the application of stress in single fibres three of silkworms and one spider.

US researchere have used laser tweezers Raman spectroscopy (LTRS) to help them characterize the effects of different chemical fixation procedures on the spectra of healthy cells and leukaemia cells and to preclude the misinterpretation of data.

A principal component analysis based on the sign of the second derivative of the surface-enhanced Raman scattering spectrum obtained on in situ grown Au-cluster-covered SiO</sub>2</sub> substrates results in improved reproducibility and enhanced specificity for bacterial diagnostics.

US researchers have used surface-enhanced Raman spectroscopy (SERS) to reveal the structure and makeup of molecules sitting on the surface of palladium-covered gold nanoshell particles. The work could lead to an improved method for cleaning up the stubborn pollutant TCE (trichloroethene).

This special issue provides an excellent overview of the great scientific contributions and developments in linear and non-linear Raman studies performed mainly by members of the former as well as the present Hamaguchi group.

Resonance Raman spectroscopy was used to follow the progression of lipid oxidation in mechanically separated turkey (MST) through oxidative bleaching of beta-carotene.

Scientists at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, are using surface-enhanced Raman spectroscopy (SERS) to test the properties of star-shaped gold nanoparticles. They have found that these particles have optical qualities that outshine the competition and could make them useful in chemical and biological sensing and imaging.

The capability of Raman microspectroscopy to provide differential diagnosis of basal cell carcinoma, squamous cell carcinoma, inflamed scar tissue, and normal tissue in vivo has been studied.

Nothing more sophisticated than a lump of graphite, a roll of sticky tape, and a wafer thin sliver of silica are needed to inflate ideas about nanochemistry. Raman spectroscopy and other techniques have been used to reveal the details of the DIY construction of a balloon-like membrane of graphene.

Surface-Enhanced Raman Scattering (SERS) of silicon nanostructures coated with a gold-silver substrate can be used to detect DNA hybridisation for biomedical and medical diagnostics purposes, according to a new study by researchers in Singapore.

A methodology was established using micro-Raman spectroscopy on an animal model to correctly identify the constituents of a selection of modern, organic tattoo inks in situ or post procedure, within the skin. This may serve as a preliminary tool prior to engaging in Q-switched laser removals to assess the risks of producing potentially hazardous compounds.

Raman spectroscopy and in situ Raman spectroelectrochemistry have been applied to the study of the lithium vapor doping of C60 single-walled carbon nanotubes (peapods).

Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy have been used to work out the adsorption mechanism of toxic heavy metals on to magnetic nanoparticles. The particles are being developed as a novel remediation material for metals such as the toxic hexavalent chromium.

The viability of Raman spectroscopy for the rapid identification of illicit substances in their containers in an airport environment has been demonstrated using portable Raman spectrometers.

UK scientists have developed a new approach for enhancing fluorescence and Raman signals recorded from turbid media in a conventional backscattering geometry. The technique results in an enhanced signal and allows the use of shorter acquisition times.

Signals in Spatially Offset Raman Spectroscopy (SORS) have been enhanced using a dielectric bandpass filter, leading to the enhancement of both the surface and subsurface Raman layer signal improving the signal-to-noise ratio of Raman spectra from the deep areas of samples.

A simpler, gentler eye test based on Raman spectroscopy could spot ocular infection and other problems without irritating patients, although they may be required to yawn during the procedure.

Organic pigment molecules in the calcium carbonate polymorph vaterite regions of freshwater cultured pearls were analysed by resonance and near-resonance micro-Raman spectroscopy and compared with their aragonitic counterparts.

A study to assess the biocompatibility and how well a new form of coated titanium implant can spur on bone growth has been carried out using a range of techniques including Raman spectroscopy, microcomputer tomography, scanning electron microscopy, atomic force microscopy, and energy dispersive X-ray analysis.

The mechanism of sialolith formation was studied by analyzing the precise distribution of phosphate (an inorganic substance) and amide III (an organic substance) in sialoliths by using Raman microspectroscopy.