essam_abdallah

Esam Mohamed Abdalla Ali

Lecturer - PhD

Faculty of medicine

Address: Tahta - Sohag

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Raman Spectroscopy: an aid to forensic and crime scene analysis

2017 | Keywords forensic, applications, Raman spectroscopy,
Raman Spectroscopy: an aid to forensic and crime scene analysis
A field-portable Raman spectrometer is a reliable technique that can be used by emergency response teams to rapidly identify unknown samples. The portability and rapidity of the analysis are significant advantages. These criteria are significantly important for law enforcement agencies working in the field and dealing with relatively large numbers of samples on a daily basis. Read more

Analytical Raman spectroscopy in a forensic art context: The non-destructive discrimination of genuine and fake lapis lazuli

2014 | Keywords Fake specimens, Forensic art analysis, Lapis lazuli, Raman spectroscopy,
Analytical Raman spectroscopy in a forensic art context: The non-destructive discrimination of genuine and fake lapis lazuli
The differentiation between genuine and fake lapis lazuli specimens using Raman spectroscopy is assessed using laboratory and portable instrumentation operating at two longer wavelengths of excitation in the near-infrared, namely 1064 and 785 nm. In spite of the differences between the spectra excited here in the near infrared and those reported in the literature using visible excitation, it is clear ... Read more

Raman spectroscopy and security applications: the detection of explosives and precursors on clothing

| Keywords forensic, explosive precursors, explosives, textiles, confocal Raman microscopy,
Raman spectroscopy and security applications: the detection of explosives and precursors on clothing
This study describes the application of confocal Raman microscopy to the detection and identification of explosives and their precursors _in situ_ on undyed natural and synthetic fibres and coloured textile specimens. Raman spectra were obtained from explosives particles trapped between the fibres of the specimens. The explosives pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT), and ammonium nitrate as well as the explosives ... Read more

The detection of flunitrazepam in beverages using portable Raman spectroscopy

| Keywords portable raman spectroscopy, beverages, flunitrazepam, fornsic ;,
The detection of flunitrazepam in beverages using portable Raman spectroscopy
Portable Raman spectroscopy has been used for the detection of the date-rape drug flunitrazepam in spiked beverages that may be involved in cases of drug-facilitated sexual assault. Solutions of flunitrazepam with different concentrations were prepared in water and for each beverage type. Although some bands attributable to the beverage matrix are present, they did not interfere with the identification of ... Read more

The preservation of archaeological brain remains in a human skeleton,

| Keywords cyanobacteria, brain tissue preservation, biosignatures, archaeological, Raman spectroscopy,
The preservation of archaeological brain remains in a human skeleton,
The identification of biomass within the cranial cavity of a waterlogged human skeleton inside a fish-tailed wooden coffin from a nineteenth century burial has been confirmed as brain tissue. A comparison is made between the Raman spectra obtained in the current study with those from an Iron Age brain found in an isolated cranium dating from about 500 years BCE, ... Read more

Forensic and security applications of a longwavelength dispersive Raman system

| Keywords explosives, drugs of abuse, 1064 nm;, dispersive near-IR Raman;, forensic,
Forensic and security applications of a longwavelength dispersive Raman system
A novel dispersive system operating at 1064-nmexcitation and coupled with transfer electron InGaAs photocathode and electron bombardment CCD technology has been evaluated for the analysis of drugs of abuse and explosives. By employing near-IR excitation at 1064-nm excitation wavelength has resulted in a significant damping of the fluorescence emission compared to 785-nm wavelength excitation. Spectra of street samples of drugs ... Read more

Screening of textiles for contraband drugs using portable Raman spectroscopy and chemometrics

| Keywords chemometrics, Raman spectroscopy;, impregnated textiles, drugs of abuse;, forensic science;,
Screening of textiles for contraband drugs using portable Raman spectroscopy and chemometrics
The impregnation of items of clothing with drugs of abuse that are then smuggled through airports and ports of entry is a growing problem for law enforcement. This work describes the application of portable Raman spectroscopic techniques for the analysis of a range of natural and artificial fibre items of clothing impregnated with drugs of abuse. Textile pieces were soaked ... Read more

The Heslington brain: a challenge for analytical Raman spectroscopy

| Keywords scytonemin, cyanobacteria, archaeological brain, prehistoric skeletal remains, Raman spectroscopy,
The Heslington brain: a challenge for analytical Raman spectroscopy
The survival of brain tissue in archaeological depositional environments is a very unusual occurrence that has generated much discussion and conjecture forensically. Here, we report the Raman spectroscopic analysis of biomaterial found in the cranial cavity of a decapitated skull dating from the Iron Age, some 2500 years ago, from which the presence of degraded protein consistent with it being ... Read more

An Interim Investigation of the Potential of Vibrational Spectroscopy for the Dating of Cultural Objects in Ivory

| Keywords FTIR spectroscopy, dating, ivory, mammoth, Rmana spectroscopy,
An Interim Investigation of the Potential of Vibrational Spectroscopy for the Dating of Cultural Objects in Ivory
Radiocarbon dating of ivory requires destructive sampling on a scale not always compatible with the requirements of the preservation and curation of cultural objects. Th e development of a minimally-destructive dating technique is urgently needed. Raman spectroscopy can detect the changes in the organic and inorganic molecular components of ivory that occur with time. It has been suggested that these ... Read more

Raman spectroscopy of archaeological and ancient resins: Problems with database construction for applications in conservation and historical provenancing

| Keywords Artefacts, Terpenoid resins, Degradation, Archaeological resins, Raman spectroscopy,
Raman spectroscopy of archaeological and ancient resins: Problems with database construction for applications in conservation and historical provenancing
The adoption of Raman spectroscopy as a screening technique for the presence of organic resins on diverse substrates is now being advocated for the first pass non-destructive examination of potential sites for limited sampling using other analytical techniques. The characterisation of ancient resins in art work and specimens recovered from archaeological excavations is critically dependent upon the analytical capability of ... Read more