Lysolecithin–Cholenterol Interaction. A Spin-Resonance and Electron-Micrographic Study

1975 ◽  
Vol 53 (2) ◽  
pp. 196-206 ◽  
Author(s):  
A. D. Purdon ◽  
J. C. Hsia ◽  
L. Pinteric ◽  
D. O. Tinker ◽  
R. P. Rand
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Membrane Structure ◽  
Phase Changes ◽  
Cholesterol Concentration ◽  
Spectral Change ◽  
Physiological Temperature ◽  
Spin Resonance

Another publication (Rand, R. P., Pangborn, W., Purdon, A. D., and Tinker, D. O. (1975) Can. J. Biochem. 53, 189–195) has established that lysolecithin and cholesterol interact to form an equimolar complex. We have investigated this complex using the techniques of electron spin resonance (e.s.r.) and electron microscopy. By varying the cholesterol concentration with lysolecithin in both thin films and dispersions studied by these techniques, we have observed the interaction between lysolecithin and equimolar complex below 50 mol% cholesterol, and between crystalline cholesterol and equimolar complex above 50 mol% cholesterol. We have observed an interesting alteration in morphology by electron microscopy, and an isotropic to anisotropic spectral change using 3-doxylcholestane and 12-doxylstearic acid spin-labelled probes when the cholesterol concentration is increased from 20 to 33 mol%. The equimolar complex is stable in the presence of crystalline cholesterol, and exhibits no phase changes in the physiological temperature range. Implications for membrane structure are discussed.

Stress effects on the electron-spin-resonance spectra of Er in gold and silver thin films

1981 ◽  
Vol 23 (7) ◽  
pp. 3149-3158 ◽  
Author(s):  
C. A. Pelá ◽  
J. F. Suassuna ◽  
G. E. Barberis ◽  
C. Rettori
Keyword(s):  
Thin Films ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Stress Effects ◽  
Spin Resonance ◽  
Silver Thin Films

Electron spin resonance in laser-crystallized polycrystalline silicon-germanium thin films

2010 ◽  
Vol 207 (3) ◽  
pp. 570-573 ◽  
Author(s):  
M. Weizman ◽  
L.-P. Scheller ◽  
N. H. Nickel ◽  
K. Lips ◽  
B. Yan
Keyword(s):  
Thin Films ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Silicon Germanium ◽  
Polycrystalline Silicon ◽  
Spin Resonance

Electron spin resonance investigation of oxygen-vacancy-related defects in BaTiO3 thin films

2005 ◽  
Vol 87 (2) ◽  
pp. 022903 ◽  
Author(s):  
V. V. Laguta ◽  
A. M. Slipenyuk ◽  
I. P. Bykov ◽  
M. D. Glinchuk ◽  
M. Maglione ◽  
...  
Keyword(s):  
Thin Films ◽  
Electron Spin Resonance ◽  
Oxygen Vacancy ◽  
Electron Spin ◽  
Resonance Investigation ◽  
Spin Resonance ◽  
Electron Spin Resonance Investigation

Raman and Electron Spin Resonance Investigations of as Prepared and Thermal Annealed Cluster Beam Deposited Carbon Thin Films

2005 ◽  
Vol 887 ◽  
Author(s):  
Giuseppe Compagnini ◽  
Orazio Puglisi ◽  
Mircea Chipara
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Resonance Line ◽  
Carbon Cluster ◽  
Single Line ◽  
Carbon Clusters ◽  
Cluster Beam ◽  
Spin Resonance

ABSTRACTNanostructured amorphous carbon thin films deposited by a Low Energy Carbon Cluster Beam Deposition technique have been characterized by Raman spectroscopy and Electron Spin Resonance (ESR). This study focuses on the correlation between carbon cluster structure and sp2 related defects. The ESR spectrum of as prepared and thermally annealed carbon clusters is a single line located near the free electron g-factor. Resonance lines were accurately fitted by a single line symmetric and narrow Lorentzian line. The resonance line parameters (line position, line amplitude, and line width) were found to be extremely sensitive to the thermal treatment of the as deposited samples. The paramagnetic centres are randomly distributed and correlated with the nanosized nature of the investigated system. The absence of the resonance line asymmetry, typical for the ESR spectra of conducting carbaceneous materials, confirms the small size of carbon nanoclusters and indicates poor electrical contacts between them. The resonance line parameters (position, intensity, and width) are not affected by the orientation of the carbon cluster film relative to the direction of the external magnetic field. The evolution of the ESR signal upon thermal treatments is sensitive to the increase of the sp2 average domain size as revealed by Raman spectroscopy. The Raman spectrum of as obtained and thermally annealed carbon clusters, in the domain 1000 cm−1 to 2000 cm−1 shows two Lorentzian lines located at 1300 cm−1 and 1550 cm−1 representing the D and G bands. The position and amplitude of these lines were found to be affected by thermal annealing.

Conduction-electron spin resonance in zinc-blende GaN thin films

1993 ◽  
Vol 48 (20) ◽  
pp. 15144-15147 ◽  
Author(s):  
M. Fanciulli ◽  
T. Lei ◽  
T. D. Moustakas
Keyword(s):  
Thin Films ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Conduction Electron ◽  
Zinc Blende ◽  
Spin Resonance

Transmission Electron Microscopy of Shock-Modified and Annealed Rutile

1983 ◽  
Vol 24 ◽  
Author(s):  
M. J. Carr ◽  
R. A. Graham ◽  
B. Morosin ◽  
E. L. Venturini
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Shock Treatment ◽  
Line Broadening ◽  
Annealing Behavior ◽  
X Ray ◽  
Transmission Electron ◽  
Spin Resonance

ABSTRACTThe annealing behavior of shock modified rutile (TiO2) powder was studied by transmission electron microscopy, x-ray line broadening, and electron spin resonance. Specimens were examined in the as-received and as-shocked conditions, and in shocked and annealed conditions after one hour at 475° or 1000°C. The dislocations generated by the shock treatment were found to persist essentially unaltered through the 475°C anneal. Substantial recovery was observed after the 1000°C anneal.

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