scholarly journals Mineralogical Insights to Identify Göktepe Marble in the Sculptural Program of Quinta Das Longas Villa (Lusitania)

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1194
Author(s):  
M. Pilar Lapuente Mercadal ◽  
Trinidad Nogales-Basarrate ◽  
Antonio Carvalho
Keyword(s):  
Analytical Techniques ◽  
White Marble ◽  
Paramagnetic Resonance ◽  
Fine Grained ◽  
Roman Villa ◽  
Multi Method Approach ◽  
High Level ◽  
Electron Paramagnetic ◽  
Method Approach

This archaeometric study is focused on the marble used in a group of fragmented sculptures found at the Roman villa of Quinta das Longas (Elvas, Portugal). Dating from the 4th century AD, the pieces are of remarkable quality and correspond to ideal and mythological figures from several iconographic cycles. The numerous fragments, all of very fine-grained white marble, are associated with the ornamentation of an impressive nymphaeum of the villa. Their high level of sculpture technique and style, the models followed and their similar typology to other well-known parallels raise the hypothesis of being linked with Aphrodisian workshops. Using a well-established multi-method approach, with Optical microscopy, X-ray Powder Diffraction (XRPD), qualitative and quantitative cathodoluminescence (CL) by CL-Optical and CL-SEM, and stable C and O isotopic and trace element analytical techniques (IRMS and ICP-AES), together with complementary parameters obtained from electron paramagnetic resonance (EPR) and 87Sr/86Sr isotopes, the marble provenance can be identified with certainty. The results all point to the best quality of white Göktepe marble, confirming the stylistic connection to the ancient Carian sculptors.

scholarly journals Do patients value a hospital’s innovativeness reputation? A multi-method approach to assess the relative importance of innovativeness reputation in patients’ hospital choice

2017 ◽  
Vol 31 (3) ◽  
pp. 138-153 ◽  
Author(s):  
Sebastian Gurtner ◽  
Nadine Hietschold ◽  
María Vaquero Martín
Keyword(s):  
Value Added ◽  
Patient Choice ◽  
Relative Importance ◽  
Hospital Choice ◽  
Patient Decision ◽  
Technical Innovations ◽  
Multi Method Approach ◽  
Method Approach

Innovations in health care are costly and risky, but they also provide the opportunity for hospitals to increase quality of care, to distinguish themselves from competitors and to attract patients. While numerous hospitals strive to increase their innovativeness by adopting a costly innovation leader strategy, the question of whether this actually influences the patient’s choice remains unanswered. To understand the role of innovativeness from the patient perspective, this study conceptualizes the construct of innovativeness reputation of hospitals and determines its relevance in patients’ hospital choice decisions. In the pretest, we identified six dimensions of innovativeness reputation such as progressive work procedures and value added services. We then used three different quantitative multi-criteria decision-making methods to evaluate the relative importance of innovativeness reputation in patient choice. We collected data from 355 former German patients who had undergone elective non-emergency surgery. Overall, innovativeness reputation accounts for 11.6%–16.8% of the patient decision. Innovativeness reputation has a moderate influence on hospital choice and should be taken into account by managers. Since technical innovations are costly, hospitals should use other means to enhance their innovative image. Strategies such as emphasizing value added services can enable hospitals to increase their innovativeness reputation efficiently.

Overhauser-enhanced MR imaging (OMRI)

1998 ◽  
Vol 39 (1) ◽  
pp. 10-17 ◽  
Author(s):  
K. Golman ◽  
I. Leunbach ◽  
J. H. Ardenkjær-Larsen ◽  
G. J. Ehnholm ◽  
L.-G. Wistrand ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Contrast Agent ◽  
Main Magnetic Field ◽  
Mr Images ◽  
Signal To Noise ◽  
Maximum Enhancement ◽  
Paramagnetic Resonance ◽  
Vascular Area ◽  
High Level ◽  
Electron Paramagnetic

Purpose: to evaluate a new single-electron contrast agent for Overhauser-enhanced MR imaging. the contrast agents that are currently available give enhancement factors that are too low to make the technique a valid option for routine clinical use Material and Methods: MR images were generated directly following the injection of the substance into rats. the MR scanner was operated at a main magnetic field of 0.01 T and equipped with a separate rf-transmitter tuned to the electron paramagnetic resonance frequency of the contrast agent Results: as expected, the images generated show a high level of enhancement in areas where the contrast agent was present, and a maximum enhancement of 60 times the normal proton signal was obtained in the vascular area. the signal-to-noise ratios in the images were superior to those previously attained Conclusion: the new contrast agent makes it possible to generate MR images with both morphological and functional information at 0.01 T. the signal-to-noise ratios found in the generated images were of the same order as, or better than, those obtained with the standard clinical routine

Music and cremation rituals in The Netherlands: A fine-grained analysis of a crematorium’s playlist

2018 ◽  
Vol 34 (4) ◽  
pp. 806-817
Author(s):  
Doris van der Smissen ◽  
Margaret A Steenbakker ◽  
Martin J M Hoondert ◽  
Menno M van Zaanen
Keyword(s):  
The Netherlands ◽  
Computational Analysis ◽  
Qualitative Approach ◽  
Close Reading ◽  
Musical Analysis ◽  
Fine Grained ◽  
History Of ◽  
Multi Method Approach ◽  
Method Approach

Abstract Although music is an important part of cremation rituals, there is hardly any research regarding music and cremations. This lack of research has inspired the authors to conduct a long-term research project, focusing on musical and linguistic aspects of music played during cremations. This article presents the analysis of a playlist consisting of twenty-five sets of music, each consisting of three tracks, used in a crematorium in the south of The Netherlands from 1986 onward. The main objective is to identify the differences and similarities of the twenty-five sets of musical tracks regarding content and musical properties. Consequently, we aim to provide insight in the history of (music played during) cremation rituals in The Netherlands. To analyze the musical properties of the sets, the authors use both a qualitative approach (close reading and musical analysis) and a computational analysis approach. The article demonstrates that a combination of a close reading and musical analysis and a computational analysis is necessary to explain the differences in properties of the sets. The presented multi-method approach may allow for comparisons against musical preferences in the context of current cremations, which makes it possible to trace the development of music and cremation rituals.

scholarly journals Structural, functional, and behavioral insights of dopamine dysfunction revealed by a deletion inSLC6A3

2019 ◽  
Vol 116 (9) ◽  
pp. 3853-3862 ◽  
Author(s):  
Nicholas G. Campbell ◽  
Aparna Shekar ◽  
Jenny I. Aguilar ◽  
Dungeng Peng ◽  
Vikas Navratna ◽  
...  
Keyword(s):  
Autism Spectrum ◽  
High Time Resolution ◽  
Paramagnetic Resonance ◽  
X Ray Crystallography ◽  
Fine Grained ◽  
Resonance Analysis ◽  
Rate Limiting Step ◽  
Abnormal Behaviors ◽  
Rate Limiting ◽  
Electron Paramagnetic

The human dopamine (DA) transporter (hDAT) mediates clearance of DA. Genetic variants in hDAT have been associated with DA dysfunction, a complication associated with several brain disorders, including autism spectrum disorder (ASD). Here, we investigated the structural and behavioral bases of an ASD-associated in-frame deletion in hDAT at N336 (∆N336). We uncovered that the deletion promoted a previously unobserved conformation of the intracellular gate of the transporter, likely representing the rate-limiting step of the transport process. It is defined by a “half-open and inward-facing” state (HOIF) of the intracellular gate that is stabilized by a network of interactions conserved phylogenetically, as we demonstrated in hDAT by Rosetta molecular modeling and fine-grained simulations, as well as in its bacterial homolog leucine transporter by electron paramagnetic resonance analysis and X-ray crystallography. The stabilization of the HOIF state is associated both with DA dysfunctions demonstrated in isolated brains ofDrosophila melanogasterexpressing hDAT ∆N336 and with abnormal behaviors observed at high-time resolution. These flies display increased fear, impaired social interactions, and locomotion traits we associate with DA dysfunction and the HOIF state. Together, our results describe how a genetic variation causes DA dysfunction and abnormal behaviors by stabilizing a HOIF state of the transporter.

Quality of Bulk CdTe Substrates and its Relation to Intrinsic Defects

1994 ◽  
Vol 299 ◽  
Author(s):  
B. K. Meyer ◽  
D. M. Hofmann ◽  
W. Stadler ◽  
P. Emanuelsson ◽  
P. Omling ◽  
...  
Keyword(s):  
Negative Charge ◽  
Acceptor Level ◽  
Dangling Bond ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Electron Paramagnetic ◽  
Jahn Teller Distortion

AbstractBoth the cadmium vacancy (Vcd) and the tellurium vacancy (VTe) in CdTe are identified by means of electron paramagnetic resonance (EPR). The Vcd is a double acceptor and the EPR spectrum is observed in its single negative charge state. The symmetry is found to be trigonal, which can be explained in a model in which the hole occupies a dangling bond t2 orbital and the orbital degeneracy is removed by a static Jahn-Teller distortion. The hyperfine interaction shows that the hole is localised on one of the four Te neighbours. The EPR spectrum of VTe+ reveals cubic (unperturbed) symmetry and the hyperfine structure shows that the unpaired electron is equally spread over the four Cd neighboursPhoto-EPR measurements locate the 0/+ state of VTe at Ev + 0.2 eV and the 2-/- acceptor level of VCd to be situated less than 0.47 eV above the valence band.

scholarly journals Sclerotia of the acellular (true) slime mould Fuligo septica as a model to study melanization and anabiosis

2008 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Krzywda ◽  
Elżbieta Petelenz ◽  
Dominika Michalczyk ◽  
Przemysław Płonka
Keyword(s):  
Water Balance ◽  
Model System ◽  
Paramagnetic Resonance ◽  
Slime Moulds ◽  
Oat Flour ◽  
Technical Simplicity ◽  
Electron Paramagnetic ◽  
Convenient Model

AbstractAcellular (true) slime moulds (Myxomycetes) are capable of a transition to the stage of sclerotium — a dormant form of plasmodium produced under unfavourable environmental conditions. In this study, sclerotia of Fuligo septica were analyzed by means of electron paramagnetic resonance (EPR) spectroscopy. The moulds were cultivated in vitro on filter paper, fed with oat flour, and kept until the plasmodia began to produce sclerotia. The obtained sclerotia differed in colour from yellow through orange to dark-brown. The EPR spectra revealed a free radical, melanin-like signal correlated with the depth of the colour; it was strongest in the dark sclerotia. Sclerotization only took place when the plasmodia were starved and very slowly dried. Only the yellow sclerotia were able to regenerate into viable plasmodia. This suggests that myxomycete cytoplasm dehydration is an active process regulated metabolically. Plasmodial sclerotization may therefore serve as a convenient model system to study the regulation of cytoplasmatic water balance, and sclerotia as a convenient material for EPR measurements, combining the quality of plasmodia with the technical simplicity of the measurements characteristic of dry spores. Darkening of the sclerotia is most probably a pathological phenomenon connected with the impairment of water balance during sclerotization.

scholarly journals Kinetics of increased generation of (.)NO in endotoxaemic rats as measured by EPR.

2003 ◽  
Vol 50 (3) ◽  
pp. 807-813 ◽  
Author(s):  
Przemyslaw M Plonka ◽  
Stefan Chlopicki ◽  
Magdalena Wisniewska ◽  
Beata K Plonka
Keyword(s):  
Hyperfine Splitting ◽  
Spin Trap ◽  
Oxidant Stress ◽  
No Production ◽  
Paramagnetic Resonance ◽  
Epr Signal ◽  
High Level ◽  
Kidney Liver ◽  
Electron Paramagnetic ◽  
Kinetics Of

Ferrous-diethyldithiocarbamate (Fe(DETC)(2)) chelate is a lipophilic spin trap developed for (.)NO detection by electron paramagnetic resonance (EPR) spectroscopy. Using this spin trap we investigated the kinetics of (.)NO production in endotoxaemia in rats induced by lipopolysaccharide (Escherichia coli, 10 mg/kg). The NO-Fe(DETC)(2) complex was found to give a characteristic EPR signal, and the amplitude of the 3rd (high-field) component of its hyperfine splitting was used to monitor the level of (.)NO. We found that in blood, kidney, liver, heart and lung (.)NO production starts to increase as early as 2 h after LPS injection, reaches the maximum 6 h after LPS injection and then returns to basal level within further 12-18 h. Interestingly, in the eye bulb the maximum of (.)NO production was detected 12 h after LPS, and the signal was still pronounced 24 h after LPS. In brief, the highly lipophilic exogenous spin trap, Fe(DETC)(2) is well suited for assessment of (.)NO production in endotoxaemia. We demonstrated that the kinetics of increased production of (.)NO in endotoxaemic organs, with the notable exception of the eye, do not follow the known pattern of NOS-2 induction under those conditions. Accordingly, only in early endotoxaemia a high level of (.)NO is detected, while in late endotoxaemia (.)NO detectability is diminished most probably due to concomitant oxidant stress.

scholarly journals Assessment of the quality of the magnetic concentrates of the titanium ores at Pizhemsky deposit from the point of view of the technological mineralogy

2019 ◽  
pp. 31-41 ◽  
Author(s):  
V. P. Lyutoev ◽  
A. B. Makeyev
Keyword(s):  
Analysis Data ◽  
Point Of View ◽  
Magnetic Fraction ◽  
Ir Absorption ◽  
Medium Thickness ◽  
Paramagnetic Resonance ◽  
Rare Earth Minerals ◽  
Electron Paramagnetic ◽  
Technological Sample

Four magnetic fractions of small classes concentrates (0,05—0,125 mm) of a representative technological sample have been separated from titanium-bearing medium thickness sandstones of Malorucheysky unit (Pizhemsky titanium deposit). They have been studied: general sample (T-2) and three partial (T-l a, b, c) ones obtained by gravitational separation in heavy liquid in three density intervals (3,3—3,5; 3,5—3,7; 3,7—3,9 g/cm3). It has been demonstrated that the magnetic fraction of the small productive classes consists mainly of pseudorutil, ilmenite, siderite (ironstone) and garnet. The phase composition of iron-titanium phases has been reliably established by the means of normative recalculation of chemical analysis data, as well as methods of Mossbauer spectroscopy, infrared (IR) absorption and electron paramagnetic resonance (EPR). The ratio of the pseudorutile, ilmenite, siderite and associated rare earth minerals monazite-kularite and zircon accumulated in the respective gravity classes, has been computed . It has been recommended to use the methods of recovery of the concentrates (extraction of zircon and monazite) before the operation of desilication, as well as their purification from siderite.

scholarly journals The Noninvasive Analysis of Paint Mixtures on Canvas Using an EPR MOUSE

Heritage ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 140-151
Author(s):  
Elizabeth A. Bogart ◽  
Haley Wiskoski ◽  
Matina Chanthavongsay ◽  
Akul Gupta ◽  
Joseph P. Hornak
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Least Squares ◽  
Epr Spectroscopy ◽  
Analytical Techniques ◽  
Least Squares Regression ◽  
Paramagnetic Resonance ◽  
Recent Introduction ◽  
Noninvasive Analysis ◽  
Electron Paramagnetic

Many artists create the variety of colors in their paintings by mixing a small number of primary pigments. Therefore, analytical techniques for studying paintings must be capable of determining the components of mixtures. Electron paramagnetic resonance (EPR) spectroscopy is one of many techniques that can achieve this, however it is invasive. With the recent introduction of the EPR mobile universal surface explorer (MOUSE), EPR is no longer invasive. The EPR MOUSE and a least squares regression algorithm were used to noninvasively identify pairwise mixtures of seven different paramagnetic pigments in paint on canvas. This capability will help art conservators, historians, and restorers to study paintings with EPR spectroscopy.

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