scholarly journals ESR and Radiocarbon Dating of Gut Strings from Early Plucked Instruments

2020 ◽  
Vol 3 (1) ◽  
pp. 13 ◽  
Author(s):  
Sumiko Tsukamoto ◽  
Taro Takeuchi ◽  
Atsushi Tani ◽  
Yosuke Miyairi ◽  
Yusuke Yokoyama
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Signal Intensity ◽  
Radiocarbon Dating ◽  
Oxidized Iron ◽  
Spin Resonance ◽  
First Time ◽  
Great Revival

Early European plucked instruments have recently experienced a great revival, but a few aspects remain unknown (e.g., the gauge of gut strings). Here we report, for the first time, that the electron spin resonance (ESR) signal intensity of oxidized iron, Fe(III), from gut strings at g = 2 increases linearly with age within a few hundred years. The signal increase in the remaining old strings on early instruments can be used to judge if they are as old as or younger than the instrument. Obtaining the authenticity information of gut strings contributes to the revival of the old instruments and the music.

Notes: Thermal Lability of Membrane Proteins of Age Separated Erythrocytes as Studied by Electron Spin Resonance Spin Label Technique

1987 ◽  
Vol 42 (11-12) ◽  
pp. 1343-1344 ◽  
Author(s):  
Grzegorz Bartosz ◽  
Gabriele Christ ◽  
Harald Bosse ◽  
Roland Stephan ◽  
Helmut Gärtner
Keyword(s):  
Electron Spin Resonance ◽  
Membrane Proteins ◽  
Erythrocyte Membrane ◽  
Electron Spin ◽  
Spin Label ◽  
Thermal Denaturation ◽  
Spin Resonance ◽  
Resonance Spin ◽  
First Time ◽  
Erythrocyte Membrane Proteins

Thermal lability of bovine erythrocyte membrane proteins was studied by electron spin resonance using maleimide spin label. The temperature of the sample during measurements could be varied for the first time be­ tween 0 and 60 °C with an accuracy of ± 0.1 °C. Our results show that “old” erythrocyte membrane proteins are less stable against thermal denaturation then “young” cells.

Radical cations of some substituted pyrenes

1970 ◽  
Vol 48 (13) ◽  
pp. 1996-1999 ◽  
Author(s):  
J. T. Cooper
Keyword(s):  
Electron Spin Resonance ◽  
Sulfur Dioxide ◽  
Chlorine Atom ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Boron Trifluoride ◽  
Radical Cations ◽  
Molecular Orbital Calculations ◽  
Spin Resonance ◽  
First Time

The electron spin resonance spectra of several substituted pyrene cations, produced by oxidation with boron trifluoride in sulfur dioxide, are reported. The spectra are analyzed and the splitting constants given. With 4-chloropyrene, hyperfine splitting is observed due to the chlorine atom, for the first time in such a species. Molecular orbital calculations (Hückel and McLachlan) are presented for three of the compounds studied.

scholarly journals Dose response of the E1’ centre in quartz

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shin Toyoda ◽  
Mana Amimoto
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Dose Response ◽  
Signal Intensity ◽  
Oxygen Vacancies ◽  
Gamma Ray ◽  
Natural Quartz ◽  
Spin Resonance ◽  
Gamma Ray Irradiation

Abstract The E1’ centre is one of the most common paramagnetic defects observed by electron spin resonance (ESR) in natural quartz, the formation of which is, however, quite complicated. The dose response to gamma ray irradiation of the E1’ centre in natural quartz was systematically investigated in the present study to find that its dose response depends on the heating conditions of the sample before irradiation. The signal intensity decreases on irradiation when quartz has been heated up to 300°C, while it increases when heated above 400°C. The phenomena can be explained by the electronic processes that heating supplies electronic holes to the oxygen vacancies while gamma ray irradiation supplies electrons.

Electron spin resonance and radiocarbon dating of coral deposited by Holocene tsunami events on Curaçao, Bonaire and Aruba (Netherlands Antilles)

2003 ◽  
Vol 22 (10-13) ◽  
pp. 1309-1315 ◽  
Author(s):  
Ulrich Radtke ◽  
Gerhard Schellmann ◽  
Anja Scheffers ◽  
Dieter Kelletat ◽  
Bernd Kromer ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radiocarbon Dating ◽  
Netherlands Antilles ◽  
Spin Resonance

scholarly journals Origin of Surface Defects in a-Si:H Films

1992 ◽  
Vol 258 ◽  
Author(s):  
H. Yan ◽  
A. Morimoto ◽  
M. Kumeda ◽  
T. Shimizu ◽  
Y. Yonezawa
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Photoelectron Spectroscopy ◽  
Present Experiment ◽  
Surface Defect ◽  
Surface Defects ◽  
Surface Oxidation ◽  
X Ray ◽  
Spin Resonance ◽  
First Time

ABSTRACTSurface oxidation and surface defect creation processes in a-Si:H films have been studied in detail by means of electron spin resonance(ESR) and X-ray photoelectron spectroscopy(XPS). It is found that Si dangling bonds created by the surface oxidation distribute far wider than the thickness of the SiO2 layer. These defects are also found to be removed out by annealing at around 100°C. These defects are proposed to be created by a stress in a-Si:H induced by the surface oxidation. Moreover, the presence of the surface defects unrelated to oxidation is shown for the first time by the present experiment. The origin of these defects, however, are not clear at present.

Electron Spin Resonance Investigations on Polystyrene-Carbon Nanotubes Composites

Materials ◽  
2004 ◽  
Author(s):  
Mircea Chipara ◽  
Jagannathan Sankar ◽  
David Hui
Keyword(s):  
Carbon Nanotubes ◽  
Electron Spin Resonance ◽  
Temperature Dependence ◽  
Electron Spin ◽  
Polymeric Matrix ◽  
Spin Resonance ◽  
First Time

Electron spin resonance investigations on nanocomposites obtained by dispersing carbon nanotubes within polystyrene are reported. The temperature dependence of ESR lines in the range 290 K to 420 K is investigated. It is for the first time that the effect of the polymeric matrix on the electron spin resonance spectra of carbon nanotubes is reported.

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