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Optical features of the fluorophore azotobactin: Applications for iron sensing in biological fluids

Date: Sep 13, 2010

Author:

The optical and biophysical characterization was carried out for the siderophore azotobactin, which is secreted by the nitrogen-fixing bacterium Azotobacter vinelandii and exhibits fluorescence in the visible range.

Read More thumbnail image: Optical features of the fluorophore azotobactin Applications for iron sensing in biological fluids

Milky melamine

Date: Sep 1, 2010

Author: David Bradley

Chinese scientists have published in the journal Talanta details of a quick and simple UV-Vis colour change technique for detecting melamine contamination in milk products. The test might help prevent future fraud using this toxic compound.

Read More thumbnail image: Milky melamine

Applying soft computing methods to fluorescence modeling of the polydimethylsiloxane/silica composites containing lanthanum

Date: Aug 9, 2010

Author:

Lanthanum was encapsulated in a complexing silica xerogel and the fluorescence of different compositions was measured to develop neural network models for estimating the fluorescence intensity based on the reaction mixture composition.

Read More thumbnail image: Applying soft computing methods to fluorescence modeling of the polydimethylsiloxanesilica composites containing lanthanum

A sniff of a nanotech insulin nasal spray

Date: Aug 1, 2010

Author: David Bradley

UV and NMR spectroscopy as well as other techniques have been used to study the slow release of insulin from water-soluble chitosan nanoparticles. The system has potential as a novel drug delivery agent for use in controlling diabetes using a nasal spray.

Read More thumbnail image: A sniff of a nanotech insulin nasal spray

Limitations in predicting dyebath exhaustion using optical spectroscopy

Date: Jul 12, 2010

Author:

The common assumptions used in models to predict dyebath concentrations and dyebath exhaustion using optical absorbance measurements that cause prediction errors are examined, especially for cases of multiple dye combinations.

Read More thumbnail image: Limitations in predicting dyebath exhaustion using optical spectroscopy

Chemical communications

Date: Jul 1, 2010

Author: David Bradley

A new system for non-electronic communication that can transmit alphanumeric information encoded as pulses of light, over intervals of hours, without needing electricity and so remaining operational even without batteries in remote, hazardous or poor locations.

Read More thumbnail image: Chemical communications

Towards an optical biopsy for the diagnosis of breast cancer in vivo by endogenous fluorescence spectroscopy

Date: Jun 14, 2010

Author:

In order to reduce the number of invasive biopsy procedures, a portable clinical system was designed based upon the excitation of endogenous fluorescence in vivo at 405 nm via a fiber-optics probe inside a disposable needle of small diameter

Read More thumbnail image: Towards an optical biopsy for the diagnosis of breast cancer in vivo by endogenous fluorescence spectroscopy

New chemical species isolated

Date: Jun 1, 2010

Author: David Bradley

Like a previously unknown species emerging into the glare of camera flashlights from the tropical undergrowth or crawling out from under a deep ocean rock, a seemingly simple small molecule, an organosulfur compound called oxathiirane, has been synthesised at long last and reveals itself under ultraviolet spectroscopic inspection.

Read More thumbnail image: New chemical species isolated

Protein shapeshifter

Date: May 15, 2010

Author: David Bradley

British researchers have created a molecular track to emulate this process and added a small molecule that can shuffle back and forth like a courier on the track.

Read More thumbnail image: Protein shapeshifter

Glyphosate uncouples gas exchange and chlorophyll fluorescence

Date: May 10, 2010

Author:

Studies on CO2 assimilation, conductance and chlorophyll fluorescence in barley (Hordeum vulgare L.) exposed to increasing doses of glyphosate suggest that gas-exchange parameters are more sensitive biomarkers for glyphosate toxicity than chlorophyll fluorescence.

Read More thumbnail image: Glyphosate uncouples gas exchange and chlorophyll fluorescence
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