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Articles

A.M.C. Davies, Tom Fearn

Tony (A.M.C.) Davies and Tom Fearn describe an enhancement of the popular partial least squares (PLS) technique, powered partial least squares (PPLS),  that has shown significantly better results.

Tony Davies Column  |  Issue 24/6 (2012)
Frank Neubrech , Annemarie Pucci

In principle, electromagnetic SEIRS should be as strong as electromagnetic surface-enhanced Raman scattering (SERS) but, in SEIRS, disturbing fluorescence is absent. In order to get maximum IR vibrational signal enhancement for sensing of rare molecules, strong resonant scattering of plasmonic objects is recommended.

Article  |  Issue 24/5 (2012)
A.M.C. Davies

Tony Davies makes sure we understand “What IS and what is NOT chemometrics” and why it matters.

Tony Davies Column  |  Issue 24/4 (2012)
Felix Scholkmann, Martin Wolf

“Measuring brain activity using functional near infrared spectroscopy: a short review” by Felix Scholkmann and Martin Wolf looks at the various methods for performing fNIRS and some applications that demonstrate why this non-invasive, safely applicable, portable and cost-effective method is now an integral part of the techniques used in neuroscience.

Article  |  Issue 24/4 (2012)
A. Roque, I. Ponte, P. Suau

A. Roque, I. Ponte and P. Suau look at “Infrared spectroscopy of nucleoprotein complexes”. The advantages of IR spectroscopy have allowed them to determine the structure of linker histones and ­protamines as they interact with DNA. Linker histones are involved with the condensation of the thick chromatin fibre and are believed to have a regulatory role in transcription through the modulation of chromatin higher order structure.

Article  |  Issue 24/4 (2012)
Tom Eby, Usha Gundusharma, Michael Lo, Khoren Sahagian, Curtis Marcott, Kevin Kjoller

It is possible to obtain both infrared spectra and thermal analysis data of individual layers in a cross-sectioned multilayer film. Since both techniques are AFM-based, the topographical features can be readily linked to the spectroscopic and thermal data at a much higher spatial resolution than previously achievable.

Article  |  Issue 24/3 (2012)
Karl H. Norris, A.M.C. Davies

The Tony Davies Column once again contains a contribution from Karl Norris, who is widely regarded as the “father of NIR spectroscopy”. Karl continues to produce innovative ideas about the field and this article is no different. Building on the previous article concerning fourth derivatives, Karl has investigated the effect of varying gap sizes with some remarkable results.

Tony Davies Column  |  Issue 24/2 (2012)
Elena Gómez-Sánchez, Simon Kunz, Stefan Simon

Do you remember magnetic tape-to-tape recorders and players? In any case, I am sure you will be interested in this article looking at the use of FT-IR spectroscopy to help the conservation of tapes in the collection of the National Museums Berlin. In “ATR/FT-IR spectroscopy for the characterisation of magnetic tape materials”, Elena Gómez-Sánchez, Simon Kunz and Stefan Simon describe how by investigating the state of the base layer of the tape, conservation efforts can be prioritised to those tapes in most immediate danger.

Article  |  Issue 24/1 (2012)
Karl H. Norris, A.M.C. Davies

This Tony Davies Column is contributed by Karl Norris, known to many as “The father of near infrared spectroscopy”. He introduces his calculation method for fourth derivatives and shows how it can be used to extract instrument noise.

Tony Davies Column  |  Issue 23/6 (2011)
Anna Serdyuchenko, Victor Gorshelev, Mark Weber, John P. Burrows

With the threat of climate change, understanding the workings of our atmosphere is of crucial importance. Ozone is the most important trace gas in the stratosphere and troposphere and it is monitored by both satellite-borne and ground-based instruments. Accurate knowledge of ozone absorption cross-sections is vital for this work and described in this article.

Article  |  Issue 23/6 (2011)
Maxime Boulet-Audet, Chris Holland

The African crested rat chews poisonous bark and then applies its saliva to specialised hairs which provide a most effective protection. Maxime Boulet-Audet and Chris Holland describe this and the use of infrared spectroscopy to learn more about this unusual animal. The new knowledge may even lead to new treatments for human cardiac conditions.

Article  |  Issue 23/6 (2011)
Zheng-Zhu Zhang, Sheng-Peng Wang, Xiao-Chun Wan, Shou-He Yan

Tea is harvested from the bud, the first leaf and the first three leaves up to a maximum of four leaves. Quality decreases from the bud down as the parts become older. This study looks at the use of NIR spectroscopy to determine optimal production using the harvested material.

Article  |  Issue 23/4 (2011)
A.M.C. Davies

Tony (A.M.C.) Davies is again telling us to “Always look at the spectrum”. This time he uses an example from the development of a NIR spectrometer to demonstrate that one doesn’t really know what’s going on until one has “looked at the spectrum”.

Tony Davies Column  |  Issue 23/4 (2011)
Todd Strother

This article shows that NIR spectroscopy offers the potential for bioprocess manufacturing companies to limit the variability in the biological production process, thereby increasing the yield and reducing the number of errors.

Article  |  Issue 23/3 (2011)
J. Reed, A.N. Davies

Anaerobic digestion is a good solution to the joint problems of dealing with organic waste and producing “clean” energy. However, running the digesters at optimum performace is a complex business. NIR spectroscopy offers a solution to monitor a number of analytes within the reactor and in real time.

Tony Davies Column  |  Issue 23/3 (2011)
A.M.C. Davies

Tony (A.M.C.) Davies stresses the importance of always looking at the spectrum, even if you [think you] know there’s nothing to learn. He relates his experience with noise in NIR spectra and what he has learnt from it. He would like us all to examine spectra for abnormality before relying on automated methods.

Tony Davies Column  |  Issue 23/2 (2011)
Lukas K. Bittner, Stefan A. Schönbichler, Verena Huck-Pezzei, Johannes D. Pallua, Christine Pezzei, Günther K. Bonn, Christian W. Huck

As nanotechnology grows in importance, the need for rapid, easy and automated analytical methods to investigate new nanomaterials increases. Near infrared (NIR) spectroscopy has the potential to replace numerous methods for the investigation of a wide range of nanostructured materials and with particular potential in the area of PAT.

Article  |  Issue 23/2 (2011)
Gerald Steiner, Thomas Bartels, Allison Stelling, Anke Burkhardt, Maria-Elisabeth Krautwald-Junghanns, Edmund Koch

This article describes the analysis of cells from the pulp of the feather by IR spectroscopy and the possibility of using infrared imaging of intact eggs to determine bird gender.

Article  |  Issue 23/1 (2011)
A.M.C. Davies, Tom Fearn

Tony Davies and Tom Fearn present “A digression on regression”. They turn their attention to one of the simpler regression techniques, Classical Least Squares (CLS). As well as an explanation of the basics, they explain why it is not often used in spectroscopy, and give the pros and cons of various regression techniques.

Tony Davies Column  |  Issue 22/6 (2010)
Nati Salvadó, Salvador Butí, Trinitat Pradell

Nati Salvadó, Salvador Butí and Trinitat Pradell have used a number of techniques to investigate changes in pictorial techniques in Catalan paintings in the 15th century. The combination of different techniques is of particular value. The use of synchtrotron radiation as a light source is also an advantage.

Article  |  Issue 22/6 (2010)