Unsaturated lipid bilayers at cryogenic temperature: librational dynamics of chain-labeled lipids from pulsed and CW-EPR

2019 ◽  
Vol 21 (34) ◽  
pp. 18699-18705 ◽  
Author(s):  
Erika Aloi ◽  
Rita Guzzi ◽  
Rosa Bartucci
Keyword(s):  
Low Temperature ◽  
Lipid Bilayers ◽  
Cryogenic Temperature ◽  
Acyl Chain ◽  
Epr Spectra ◽  
Unsaturated Lipid ◽  
Librational Motion

Echo-detected EPR spectra are used to study the effects of acyl chain unsaturation on the librational motion of chain-labeled lipids in the low-temperature phases of POPC and DOPC bilayers.

The Microscopic Structure Of Shallow Donors In Silicon Carbide

1996 ◽  
Vol 442 ◽  
Author(s):  
J.-M. Spaeth ◽  
S. Greulich-Weber ◽  
M. März ◽  
E. N. Kalabukhova ◽  
S. N. Lukin
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Double Resonance ◽  
Epr Spectra ◽  
Electron Nuclear Double Resonance ◽  
Paramagnetic Resonance ◽  
Vacancy Pair ◽  
Temperature Spectra ◽  
Electron Paramagnetic

AbstractThe electronic structure of nitrogen donors in 6H-, 4H- and 3C-SiC is investigated by measuring the nitrogen hyperfine (hf) interactions with electron nuclear double resonance (ENDOR) and the temperature dependence of the hf split electron paramagnetic resonance (EPR) spectra. Superhyperfine (shf) interactions with many shells of 13C and 29Si were measured in 6H-SiC. The hf and shf interactions are discussed in the framework of effective mass theory. The temperature dependence is explained with the thermal occupation of the lowest valley-orbit split A1 and E states. It is proposed that the EPR spectra of P donors observed previously in neutron transmuted 6H-SiC at low temperature (<10K) and high temperature (>60K) are all due to substitutional P donors on the two quasi-cubic and hexagonal Si sites, whereby at low temperature the E state is occupied and at high temperature the A1 state. The low temperature spectra are thus thought not to be due to P-vacancy pair defects as proposed previously.

Large magnetic entropy change at cryogenic temperature in rare earth HoN nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75562-75569 ◽  
Author(s):  
K. P. Shinde ◽  
S. H. Jang ◽  
M. Ranot ◽  
B. B. Sinha ◽  
J. W. Kim ◽  
...  
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Cryogenic Temperature ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Environmental Problems ◽  
Magnetic Refrigeration ◽  
Magnetic Entropy ◽  
Alternative Technology

The most extensive cooling techniques based on gases have faced environmental problems. The magnetic refrigeration is an alternative technology based on magnetocaloric effect. HoN nanoparticles are good refrigerant material at low temperature.

Geochemistry and EPR of cassiterites from the Iberian Hercynian Massif

1997 ◽  
Vol 61 (406) ◽  
pp. 357-365 ◽  
Author(s):  
A. Murciego ◽  
A. Garcla Sanchez ◽  
Y. Dusausoy ◽  
J. M. Martin Pozas ◽  
R. Ruck
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Microprobe Analysis ◽  
Epr Spectra ◽  
Quartz Veins ◽  
Coupled Substitution ◽  
Tin Deposits ◽  
Microprobe Data

AbstractThis paper is based on microprobe analysis (Ta, Nb, Fe, Mn, Ti, W, Sn) and Fe3+EPR spectra of cassiterite samples from 14 tin deposits from the Iberian Hercynian Massif. The interpretation of microprobe data, atomic ratios (Fe+Mn)/(Nb+Ta), and Fe3+EPR spectra reveal that the coupled substitution: 3Sn4+= (Fe,Mn)2++ 2(Nb,Ta)5+is dominant in cassiterites from pegmatites, and high-temperature quartz veins and in the dark zones of cassiterites.The mechanisms:2Sn4+= Fe3++ (Nb,Ta)5+andSn4++ O2−= Fe3++ OH−are dominant in those from medium-low temperature quartz veins and in the light zones of cassiterites.

Selective arrangement of vesicles on artificial lipid membrane by biotin-avidin interaction

2021 ◽  
Author(s):  
Kai Hashino ◽  
Daiya Mombayashi ◽  
Yuto Nakatani ◽  
Azusa Oshima ◽  
Masumi Yamaguchi ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Lipid Bilayers ◽  
Liquid Crystalline ◽  
Lipid Membrane ◽  
Unsaturated Lipid ◽  
Si Substrates ◽  
Phase Domain ◽  
Unsaturated Lipids ◽  
Lipid Mixtures ◽  
The Difference

Abstract Lipid bilayers suspended over microwells on Si substrates are promising platforms for nanobiodevices that mimic cell membranes. Using the biotin-avidin interaction, we have succeeded in selectively arranging vesicles on the freestanding region of a lipid bilayer. When ternary lipid mixtures of saturated lipid, unsaturated lipid, and cholesterol are used, they separate into liquid-order (Lo) and liquid-crystalline (Lα) domains. A freestanding lipid bilayer prefers the Lα-phase over the Lo-phase because of the difference in their flexibility. In addition, the type of biotinylated lipid determines whether it is localized in the Lα-phase domain or the Lo-phase domain. As a result, the biotinylated unsaturated lipids localized in the Lα-phase domain aggregate in the freestanding lipid bilayer, and vesicles labeled with biotin selectively bind to the freestanding lipid bilayer by the biotin-avidin interaction. This technique helps to introduce biomolecules into the freestanding lipid bilayer of nanobiodevices via vesicles.

Basic Study for Destruction of Cryogenic Pressure Vessel By Shock Wave

2003 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Shigeru Itoh ◽  
Toru Hamada ◽  
Kazuyuki Hokamoto
Keyword(s):  
Shock Wave ◽  
Low Temperature ◽  
Temperature Region ◽  
Pressure Vessel ◽  
Test Piece ◽  
Industrial Development ◽  
Cryogenic Temperature ◽  
Optical Microscope ◽  
Basic Study ◽  
Lng Tank

In recent years, a use for cryogenic fluids as a coolant has been increasing because of the industrial development of low temperature technology. Therefore, the use of the cryogenic pressure vessel becomes general. LNG-tank, LN2, O2-tank at food factory and medical facilities are given for example. The shock tolerance of the various material under cryogenic temperature region that consist cryogenic pressure vessel is necessary with considering about them safety. The fact that material becomes fragile when it becomes a low temperature has already been known. Property of material in the temperature area of −200°C and under aren’t known very much. Therefore, we carried out experiments, which test piece are exposed to shock wave under cryogenic temperature region, and investigated destruction of test piece. The breaking surface of test piece was observed by using of the SEM. Structure of material was observed by an optical microscope.

Low temperature EPR spectra of Fe3+centers in ternary layered TlGaS2crystal

2008 ◽  
Vol 43 (8) ◽  
pp. 863-868 ◽  
Author(s):  
M. Acikgoz ◽  
S. Kazan ◽  
F. A. Mikailov ◽  
E. Kerimova ◽  
B. Aktas
Keyword(s):  
Low Temperature ◽  
Epr Spectra

Effect of acyl chain length on the structure and motion of gramicidin A in lipid bilayers

1989 ◽  
Vol 985 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Bruce A. Cornell ◽  
Frances Separovic ◽  
Denise E. Thomas ◽  
Annette R. Atkins ◽  
Ross Smith
Keyword(s):  
Lipid Bilayers ◽  
Chain Length ◽  
Acyl Chain ◽  
Gramicidin A ◽  
Structure And Motion ◽  
Acyl Chain Length

scholarly journals Synaptotagmin 1 Modulates Lipid Acyl Chain Order in Lipid Bilayers by Demixing Phosphatidylserine

2011 ◽  
Vol 286 (28) ◽  
pp. 25291-25300 ◽  
Author(s):  
Alex L. Lai ◽  
Lukas K. Tamm ◽  
Jeffrey F. Ellena ◽  
David S. Cafiso
Keyword(s):  
Lipid Bilayers ◽  
Acyl Chain ◽  
Chain Order ◽  
Synaptotagmin 1

Waveguide-enhanced scattering from thin biomolecular films

2002 ◽  
Vol 35 (2) ◽  
pp. 163-167 ◽  
Author(s):  
F. Pfeiffer ◽  
U. Mennicke ◽  
T. Salditt
Keyword(s):  
Lipid Bilayers ◽  
Signal To Noise Ratio ◽  
Acyl Chain ◽  
Grazing Incidence ◽  
Waveguide Structure ◽  
X Ray Diffraction ◽  
Signal To Noise ◽  
X Ray ◽  
Grazing Incidence Diffraction ◽  
Chain Ordering

An X-ray diffraction experiment on multilamellar membranes incorporated into an X-ray waveguide structure is reported. In the device, the lipid bilayers are confined to one side by the silicon substrate and to the other side by an evaporated thin metal cap layer. Shining a highly brilliant X-ray beam onto the system, resonantly enhanced, precisely defined and clearly distinguishable standing-wavefield distributions (modes) are excited. The in-plane structure of the acyl chain ordering is then studied by grazing incidence diffraction under simultaneously excited modes. A significant gain in signal-to-noise ratio as well as enhanced spatial resolution can be obtained with such a setup.

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