Analysis of Biological Elements of Scalp Hairs With Sem-Edx and Tem and its Application to the Hair Comparison

1985 ◽  
Vol 43 ◽  
pp. 120-121
Author(s):  
S. Seta
Keyword(s):  
Crime Scene ◽  
Trace Element Composition ◽  
Element Composition ◽  
Personal Identification ◽  
X Ray ◽  
Evidential Value ◽  
Hair Samples ◽  
Hair Strand ◽  
Blood Grouping ◽  
Scanning Electron

Personal identification of hair samples collected from the crime scene has been principally made on basis of precise comparison of morphological features and the result of blood grouping of hair samples. For the present only ABO blood types can be routinely examined on hair samples, and therefore, other additional informations for the hair comparison have long been required, among which the trace element composition of hairs has been utilized as giving a clue to the hair comparison. Here, scanning electron microscope equipped with energy dispersive X-ray microanalyzer (SEM/EDX), which has been widely used to examine many kinds of physical evidences in forensic laboratories, was applied to the elemental analysis of hairs. Since SEM/EDX enables us to analyze very small amount of sample, it is very efficient in the hair comparison in which each single hair strand collected from crime scenes has its own evidential value. But SEM/EDX analysis of hairs involves the intrinsic problem that trace elements other than sulfur and chlorine are very hard to detect from raw hair samples.

Human-hair analysis

1992 ◽  
Vol 50 (1) ◽  
pp. 886-887
Author(s):  
Brenda E. Lambert ◽  
Ernest C. Hammond
Keyword(s):  
Human Hair ◽  
Hair Analysis ◽  
Hair Shaft ◽  
White Female ◽  
Chemical Processing ◽  
X Ray ◽  
Hair Samples ◽  
Wave Technique ◽  
Permanent Wave ◽  
Scanning Electron

The purpose of this study was to examine the external structure of four human hair shaft samples with the scanning Electron Microscope (SEM) and to obtain information regarding the chemical composition of hair by using the attached x ray microanalysis unit.The hair samples were obtained from two female subjects. Sample A was taken from a black female and had not undergone any type of chemical processing. Sample B, C, D were taken from a white female, and were natural, processed, and unpigmented, i.e. “gray”, respectively. Sample C had been bleached, tinted, and chemically altered using a permanent wave technique.

Early Palaeolithic bone diagenesis in the Arago cave at Tautavel, France

1999 ◽  
Vol 63 (6) ◽  
pp. 801-812 ◽  
Author(s):  
L. Quattropani ◽  
L. Charlet ◽  
H. de Lumley ◽  
M. Menu
Keyword(s):  
Clay Minerals ◽  
Gamma Ray ◽  
Trace Element Composition ◽  
Element Composition ◽  
X Ray Diffraction ◽  
Human Occupation ◽  
X Ray ◽  
Bone Diagenesis ◽  
Very High ◽  
P Influx

AbstractBones from level G in the Arago cave (Tautavel, Southern France, 450 ky) were analysed using a combination of particle induced X-ray and gamma-ray emission (PIXE and PIGME) and X-ray diffraction (XRD). Human occupation and guano production by bats introduced a large amount of phosphate into the cave and as a result a decarbonated pocket was formed in the sediment, characterized by the dissolution of clay minerals, calcite and bones, and by the precipitation of phosphate secondary minerals. The Al released by clay minerals was reprecipitated as crandallite in the few remaining bones, and as montgomeryite with traces of crandallite in the surrounding sediments. Bones within the pocket have very high levels of Al, Fe, F and Zn and often have ‘diffusive’ type U-shaped concentration profiles. These profiles show that post-mortem uptake of trace elements occurred, and thus that trace element composition has to be used with care in palaeonutritional studies but is indicative of local palaeoenvironment. This uptake is complicated by a large increase in hydroxylapatite crystallinity in Palaeolithic bones compared to modern or more recent ones, as a result of the large P influx which occurred in the Arago cave after the sediment deposition.

Determination of the trace element composition of human hair

2020 ◽  
Vol 20 (3) ◽  
pp. 23-32
Author(s):  
S. S. Savinov ◽  
N. A. Riadchikova ◽  
T. M. Pikalova ◽  
A. I. Drobyshev
Keyword(s):  
Trace Element ◽  
Human Hair ◽  
Atomic Emission ◽  
Trace Element Composition ◽  
Small Sample ◽  
Element Composition ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Hair Samples

Hair is one of the promising non-invasive samples for monitoring the trace element composition of the human body. But it is necessary to take into account the individual and subpopulation characteristics of sample donors. Inthis work, we experimentally studied the features of the analysis of human hair samples for the determination of trace elements by arc atomic emission spectrometry using a dry residue after acid mineralization. Validation was carried out by comparative analysis by the method used, as well as by atomic emission spectrometry with inductively coupled plasma. It has been shown that the concentrations of Al, B, Ca, Cu, Fe, Mg, Mn, P, Pb, Zn in a set of 50samples from different donors obey the lognormal law, and therefore, the geometric mean (or median) is preferable as mean value. The content of Ca and Mg is higher in the female hair, while the content of Pb is higher in the male hair. Theconcentrations of Fe, Mn, and Pb are slightly higher in the hair of smokers than in non-smokers, but this difference is not statistically significant (probably due to the small sample size). Although the concentrations of several elements (including Mg, Mn, and P) differ in the hair of donors living in different regions of Russia, we failed to establish asignificant difference of this factor. Positive correlations were found between the contents of some elements, in particular, Mg/Ca, Al/Fe, Al/P, Cu/Fe, Cu/P, Fe/P, weaker relationships were found for Al/Cu, Ca/Mn, Cu/Pb, Mn/P.

Typomorphic gold features as criteria of placer association with primary gold-silver-type sources (example from Mnogovershinnoye ore placer cluster)

2020 ◽  
pp. 3-23
Author(s):  
Igor Migachev ◽  
Olga Minina ◽  
Vadim Zvezdov
Keyword(s):  
Crystal Morphology ◽  
Gold Cluster ◽  
Primary Source ◽  
Trace Element Composition ◽  
Element Composition ◽  
Primary Sources ◽  
X Ray ◽  
Icp Ms ◽  
Gold Silver ◽  
Comprehensive Study

A comprehensive study of native gold from Mnogovershinnoye gold cluster ores and placers (granulometry, crystal morphology, internal structure, nature of exogenetic transformations, fineness and trace element composition) was performed to define placer association with primary sources. Using ICP-MS method and X-ray spectrographic analysis, new data on geochemical gold features was obtained, which expands and clarifies the evidence of gold typomorphism from a gold-silver deposit primary source and its association with placers.

scholarly journals Studies on Structural, Morphology and Electrical Properties of Chemically Sprayed WO3-V2O5 Nanocomposites thin Films

2015 ◽  
Vol 53 ◽  
pp. 71-78
Author(s):  
J.M. Patil ◽  
S.B. Patil ◽  
R.H. Bari ◽  
A.N. Sonar
Keyword(s):  
Electron Microscopy ◽  
Activation Energy ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Spray Pyrolysis Technique ◽  
Element Composition ◽  
Structural Morphology ◽  
X Ray ◽  
Increase With Increase ◽  
Scanning Electron

Spray pyrolysis technique was employed to prepare WO3-V2O5 nanocomposites thin onto the preheated glass substrate at 350 °C. The films were characterized using X-ray diffractogram (XRD), Field emission scanning electron microscopy (FE-SEM), and Element composition was studied using energy dispersive spectrophotometer (EDAX).The film thickness was measured using weight difference method. Electrical conductivity measured with the help of two probe method. The crystallite size and grain size were observed to be increase with increase in films thickness with decrease in activation energy. The results are discussed and interpreted.

X-Ray fluorescence measurement of the zinc profile of a single hair.

1982 ◽  
Vol 28 (4) ◽  
pp. 650-654 ◽  
Author(s):  
T Y Toribara ◽  
D A Jackson
Keyword(s):  
Zinc Content ◽  
Fluorescence Measurement ◽  
X Ray ◽  
Single Hair ◽  
Foreign Countries ◽  
Hair Samples ◽  
Hair Strand ◽  
Sample Chamber ◽  
Fluorescence Spectrometer ◽  
The Relationship

Abstract Many trace elements appear in hair in concentrations related to those in the blood, but the relationship for zinc is complicated by disorders that probably affect its state in the blood. A built-to-order x-ray fluorescence spectrometer was used to measure, nondestructively, the concentrations of 16 elements in a 1-mm interval of a single hair. A scan along a hair strand, together with the known growth rate, enables the zinc concentration in the hair to be correlated with the time the hair was formed. A comparison with the blood concentration at the same time may reveal possible bodily disorders that affect the availability of zinc to incorporation in the hair. The instrument has been carefully calibrated for zinc, and we studied the conditions under which there can be losses or gains in the hair after sampling. The sample chamber will accommodate 16 separate holders, and each sample may be automatically measured according to a program pre-selected for it. The average zinc content of hair samples from foreign countries, some ancient specimens, and an interesting profile of a strand from an Iraqi woman are shown.

scholarly journals Proton Induced X-Ray Emission (Pixe) Analysis of Meteoritic Microsamples

1985 ◽  
Vol 85 ◽  
pp. 157-158
Author(s):  
R. Wallenwein ◽  
H. Blank ◽  
E.K. Jessberger ◽  
K. Traxel
Keyword(s):  
Interplanetary Dust ◽  
Trace Element Composition ◽  
Element Composition ◽  
Dust Particles ◽  
Interplanetary Dust Particles ◽  
Pixe Analysis ◽  
X Ray ◽  
Examination Methods ◽  
The Heidelberg Proton Microprobe ◽  
Cometary Origin

AbstractInterplanetary dust particles (IDPs) collected in the stratosphere are thought to be mostly of cometary origin. They survived heating during their deceleration in the earth’s atmosphere (1). Because of their small size (< 50 μm ) and mass (< 10−7 g) they are difficult to analyse. Special preparation and examination methods have been developed for their investigations (2). We set out to study the trace-element-composition of these particles using the Heidelberg proton microprobe.

Some Boiler Tubes Crack Reason Analysis

2013 ◽  
Vol 405-408 ◽  
pp. 3253-3258 ◽  
Author(s):  
Ling Pan ◽  
Xue Jun Xie ◽  
Jun Shen ◽  
Zhao Li ◽  
Rui Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Photoelectron Spectroscopy ◽  
Element Composition ◽  
Corrosion Products ◽  
Back Side ◽  
X Ray ◽  
Boiler Tubes ◽  
Scanning Electron

Aiming at some boiler tubescrack in a power plant, the element composition and the valence of elements in corrosion products on the outer surfaces of the boiler tubes were analysed by Scanning Electron Microanalyzer (SEM) and X-ray Photoelectron Spectroscopy (XPS), and the corrosion reason and mechanism of the outer surfaces of the boiler tubes were studied.The results showed as follows. (1)The content of element S in the corrosion products on the outer surfaces of the fire side boiler tubes was bigger than that in the corrosion products on the outer surfaces of the back side boiler tubes and the corrosion of the outer surfaces of the fire side boiler tubes was more serious than that of the outer surfaces of the back side boiler tubes. (2) the element S in the corrosion products existed in the form of sulfate (SO42-), because the valence of S in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes was +6, not-2. (3) the element Fe in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes existed in the form of Fe3O4, Fe2O3 or Fe2(SO4)3. (4) The corrosion of the boiler tubes was induced by sulphate under high temperature, and aggravated with the temperature of the outer surfaces of the boiler tubes elevated.

scholarly journals Extraction and Characterization of Fibres from the Stalk and Spikelets of Empty Fruit Bunch

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yakum Reneta Nafu ◽  
Josepha Foba-Tendo ◽  
Ebenezer Njeugna ◽  
Gossett Oliver ◽  
Kavian Omar Cooke
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Boric Acid ◽  
Mechanical Performance ◽  
Surface Composition ◽  
Major Axis ◽  
Trace Element Composition ◽  
Empty Fruit Bunch ◽  
X Ray ◽  
Scanning Electron

Fibres from different parts of empty fruit bunch, which is a major solid waste from oil palm processing, were subjected to different pretreatments and characterised for variability in length and diameter, mechanical performance, and proximate and trace element composition. Morphology and surface composition of the fibres were determined using scanning electron microscopy with energy dispersive X-ray. The fibres were further treated with KOH-boric acid and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. Fibre yield was higher for spikelet than stalk. Fibres from stalk were generally larger in diameter and showed significant differences in potassium and galacturonic acid content, strength, and rigidity. Scanning electron microscopy confirmed the widespread occurrence of silica bodies as well as significant differences in the microstructure of stalk and spikelet fibres. Stalk fibres showed a greater level of porosity than spikelet fibres in the section perpendicular to the major axis. The morphology of KOH-boric acid treated fibres suggested higher recalcitrance of spikelet fibres. The significant differences between fibres from stalk and spikelet suggest that EFB, used as feedstock for biobased industries, requires more systematic characterization and separation into stalk and spikelet, which may lead to a more judicious exploitation of this valuable waste.

Sign in / Sign up

Export Citation Format

Share Document