Journal article. Access the full text Link. Lookup at Google Scholar. Determination of ripeness stages of Mazafati variety of date fruit by Raman spectroscopy. Introduction: The economical yield of date fruits depends on many factors Al-Shahib and Marshall, One of them is harvesting in optimum stage. Generally, date fruits have four distinct stages of ripeness to satisfy different consumption requirements e. Decreasing moisture content and increasing sugar content happens gradually while the date ripeness approaches to Tamr stage.
Raman fibre optic approach to artwork dating.
Forensic document examiners in the Department of Justice have identified specific needs in the analysis of intersecting lines with respect to sequence and dating of lines in questioned documents such as forgeries and alterations. Raman spectroscopy has great potential in forensics, in part because it is nondestructive to evidence. Raman has recently shown promise in successfully identifying and differentiating several different types of inks.
Application of Infrared and Raman spectroscopy for date palm (phoenix dactylifera) analysis. Hanane Belghit, Shaymaa Abdrabo, Guillermo Grindlay, Luis Gras.
Raman spectroscopy is an analytical technique where scattered light is used to measure the vibrational energy modes of a sample. It is named after the Indian physicist C. Raman who, together with his research partner K. Krishnan, was the first to observe Raman scattering in Raman spectroscopy extracts this information through the detection of Raman scattering from the sample.
When light is scattered by molecule, the oscillating electromagnetic field of a photon induces a polarisation of the molecular electron cloud which leaves the molecule in a higher energy state with the energy of the photon transferred to the molecule. This can be considered as the formation of a very short-lived complex between the photon and molecule which is commonly called the virtual state of the molecule.
The virtual state is not stable and the photon is re-emitted almost immediately, as scattered light. Figure 1 Three types of scattering processes that can occur when light interacts with a molecule. In the vast majority of scattering events, the energy of the molecule is unchanged after its interaction with the photon; and the energy, and therefore the wavelength, of the scattered photon is equal to that of the incident photon.
This is called elastic energy of scattering particle is conserved or Rayleigh scattering and is the dominant process.
Study record managers: refer to the Data Element Definitions if submitting registration or results information. This study will evaluate the ease and reliability of Raman scattering spectroscopy, a new technique to measure the amount of the pigment lutein in the retina, the light-sensitive tissue lining the back of the eye. The highest concentrations of lutein are in the center of the retina, called the macula, which is the area most important for fine, detailed vision.
The functions of lutein are not fully known. Besides absorbing blue light, it may help protect against abnormal changes in the retina, such as age-related macular degeneration.
ABSTRACT: The Ndalambiri rock shelter in the Ebo region of Angola is a key site for assessing human occupation there given its potential association between.
As a service to our authors and readers, this journal provides supporting information supplied by the authors. Technical support issues arising from supporting information other than missing files should be addressed to the authors. Raman spectroscopy is, herein, evaluated for the purpose of estimating the age of fingermarks deposits. It is hypothesized that fibrous proteins are present and that oxidation of amino acid side chains can be observed both through Raman and fluorescence spectroscopy.
In parallel, new and ongoing advances in forensic analysis have been realized, which provide additional information to the forensic investigator, 1 for example chemical identification of contaminant particles, 2 age estimation of FMs 3 and blood stains, 1c and gender determination based on saliva 4 and blood. Large challenges are expected for the development of such a FM age determination method, mainly owing to the large amount of variables influencing the kinetics involved in FM degradation.
Moreover, they often encompass hyperspectral imaging, that is, the image contrast is governed by spectral information from each pixel. Likely, the chemical composition of the oily regions is represented by sebaceous secretions, whereas the solid particulates mainly originate from the epidermis. Raman spectra from a freshly deposited FM red and after one month of aging blue. Measurements obtained from a particulate deposit.
However, the observed kinetic of this band is slower compared to the peak of squalene. Proteins are known to be chemically stable residues in fingermarks 6c and have been utilized as targets for chemical enhancement using ninhydrin since These bands are more evident in spectra from particles, owing to their higher protein content.
Toward a novel framework for bloodstains dating by Raman spectroscopy: How to avoid sample photodamage and subsampling errors. Talanta IF 5. Unfortunately, the relevance of preserved evidence to the committed offence usually cannot be verified, because forensic experts are still incapable of providing an accurate estimate of the bloodstains’ age. An antidote to this impediment might be substituting the classical dating approach – founded on the application of calibration models – by the comparison problem addressed using likelihood ratio tests.
The key aspect of this concept involves comparing the evidential data with results characterizing reference bloodstains, formed during the process of supervised ageing so as to reproduce the evidence.
The knowledge on the artists’ materials that were available in particular regions and periods can help in dating artefacts. The retrieval of pigments with a well-.
The Marbles are still there, but the books have gone to the brand new British Library nearby and the Reading Room has become redundant. Sir Norman Foster, the architect of the revamped Reichstag masterminded the construction of a magnificent Education Centre in the rotunda and the meeting was held in one of its superb new lecture theatres. My first impression was one of surprise at the number of people attending.
I expected to see perhaps 30 faces, many of whom would be old friends. The friends were there, but most of the attendees, almost of them were from all over Europe and many indeed from the Art World. These were enthusiastic practitioners expert in Art History, Restoration, Conservation and Archaeology. The lecture programme was extensive and the posters many and very varied. It is quite clear that Raman is now well on its way to becoming established as a primary tool in the analysis of artefacts.
Raman Scattering Spectroscopy to Measure Macular Pigment
Many Middle Stone Age sites in South Africa yielded hundreds, even thousands, of ochre pieces sometimes showing use traces. Less attention has been paid to the tools used for their processing. The tools were first examined with optical microscopy to detect areas of interest. Then, Raman micro-spectroscopy was performed on the residues present, as well as on random areas of tool surfaces.
Raman spectroscopy and associated techniques used in the pre- screening stage of radiocarbon dating process. Maria-Mihaela Manea*, Corina-Anca Simion.
Raman spectroscopy has undergone rapid development over the last few decades. The ability to acquire a spectrum in only a few tens of milliseconds allows use of Raman mapping as a routine technique. However, with respect to classical single spectrum measurement, this technique is not still as widely used as it could be, in particular for mineralogy and petrography. Here, we explain the advantages of Raman mapping for obtaining additional information compared to single spot analyses.
The principle and the limits of the technique are first explained in 2D and 3D. Data processing techniques are then described using different types of rocks and minerals to demonstrate the utility of Raman mapping for obtaining information about the general composition, identification of small phases, as well as for distinguishing minerals that are spectrally very close.
Finally, a gallery of images from representative samples is used to illustrate the discussion. Raman Spectroscopy and Applications. Raman spectroscopy is a very powerful technique allowing study of atomic bonds and identification of crystalline structures.
REAL-TIME HYDRAZINE MONITORING WITH SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS)
Fingermarks have, for a long time, been vital in the forensic community for the identification of individuals, and a possibility to non-destructively date the fingermarks would of course be beneficial. Raman spectroscopy is, herein, evaluated for the purpose of estimating the age of fingermarks deposits. The degradation rates were accelerated, less pronounced for proteins, when samples were stored under ambient light conditions, likely owing to photo-oxidation.
It is hypothesized that fibrous proteins are present and that oxidation of amino acid side chains can be observed both through Raman and fluorescence spectroscopy.
lines with respect to sequence and dating of lines in questioned documents such as forgeries and alterations. Raman spectroscopy has great.
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Towards Fingermark Dating: A Raman Spectroscopy Proof‐of‐Concept Study
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of ripeness stages of Mazafati variety of date fruit by Raman spectroscopy  Introduction: The economical yield of date fruits depends on many factors.
Because different chemical functional groups scatter light at different frequencies, Raman spectroscopy can be used as a tool for chemical structure analysis, chemical fingerprinting and chemical imaging. Research 20 August Open Access. Zhang et al present an integrated real-time imaging and flow field control platform based on water droplet evaporation on super-hydrophobic substrate SHS to enable amyloid fibril aggregation.
They apply this methodology to observe structural polymorphism in PHF6 peptide and full length Tau Research 10 August Research 31 July Open Access. Research 29 July Open Access.