11 research outputs found
Absence of Tc-Pinning Phenomenon Under High Pressure in High-Entropy REO0.5F0.5BiS2 Layered Superconductor
Full text linkRecently, robustness of superconductivity (transition temperature, Tc) under
high pressures has been observed in high-entropy alloy (HEA), bcc-type
Ti-Zr-Hf-Nb-Ta, and HEA-type compounds (Ag,In,Sn,Pb,Bi)Te with a NaCl-type
structure. Since those materials have three-dimensional crystal structure,
investigation on the pressure dependence of Tc of low-dimensional materials is
needed to understand the phenomena. Here, we investigated the superconducting
properties and the crystal structure of BiS2-based layered system
REO0.5F0.5BiS2. Although the robustness of Tc was induced in MTe with
increasing M-site configurational entropy, the increase in RE-site
configurational entropy does not induce robustness of Tc under high pressures
in REO0.5F0.5BiS2. The crystal structure of HEA-type REO0.5F0.5BiS2 was
confirmed as monoclinic P21/m, which is the same space group as the
zero-entropy counterpart LaO0.5F0.5BiS2. The results suggest that an increase
in configurational entropy at blocking layers do not affect crystal structure
and superconducting properties under high pressures in the BiS2-based layered
system.Comment: 9 pages, 4 figure
La législation du dépôt légal pendant l’Occupation
No full textLa Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946Cet article inaugure dans la carnet de blog "La Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946", une série sur les évolutions du fonctionnement et de la législation du dépôt légal durant la Seconde Guerre mondiale
La législation du dépôt légal pendant l’Occupation
No full textLa Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946Cet article inaugure dans la carnet de blog "La Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946", une série sur les évolutions du fonctionnement et de la législation du dépôt légal durant la Seconde Guerre mondiale
La législation du dépôt légal pendant l’Occupation
No full textLa Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946Cet article inaugure dans la carnet de blog "La Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946", une série sur les évolutions du fonctionnement et de la législation du dépôt légal durant la Seconde Guerre mondiale
La législation du dépôt légal pendant l’Occupation
No full textLa Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946Cet article inaugure dans la carnet de blog "La Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946", une série sur les évolutions du fonctionnement et de la législation du dépôt légal durant la Seconde Guerre mondiale
La législation du dépôt légal pendant l’Occupation
No full textLa Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946Cet article inaugure dans la carnet de blog "La Bibliothèque nationale sous l'Occupation - Des sources pour l'histoire du livre et des collections entre 1940 et 1946", une série sur les évolutions du fonctionnement et de la législation du dépôt légal durant la Seconde Guerre mondiale
Ionic scattering factors of atoms that compose biological molecules
No full textIonic scattering factors of atoms that compose biological molecules have been computed by the multi-configuration Dirac–Fock method. These ions are chemically unstable and their scattering factors had not been reported except for O−. Yet these factors are required for the estimation of partial charges in protein molecules and nucleic acids. The electron scattering factors of these ions are particularly important as the electron scattering curves vary considerably between neutral and charged atoms in the spatial-resolution range explored in structural biology. The calculated X-ray and electron scattering factors have then been parameterized for the major scattering curve models used in X-ray and electron protein crystallography and single-particle cryo-EM. The X-ray and electron scattering factors and the fitting parameters are presented for future reference
Facile Chemoselective Strategy toward Capturing Sphingoid Bases by a Unique Glutaraldehyde-Functionalized Resin
No full textSphingoid
bases, which have a 2-amino-1,3-diol common functional
group, are the structural backbone units of all sphingolipids. Recently,
much attention has been focused on sphingoid bases because of their
potentially beneficial bioactivities toward various cancer cells as
well as their dietary interest. However, low abundance and the handling
complexity caused by their amphiphilic character led to very limited
research on them. Glutaraldehyde has two aldehyde groups, and it reacts
rapidly with the 2-amino-1,3-diol functional group of sphingosine
to give a tricyclic product. Immobilization of glutaraldehyde on a
resin was successfully performed by organic synthesis, starting from <i>trans</i>-<i>p</i>-coumaric acid via eight steps.
This approach suppresses the self-polymerization of glutaraldehyde,
and addition of water to the developed resin causes the formation
of cyclic double hemiacetal function, which avoids oxidation like
a reducing sugar in nature and makes it stable even for up to 1 year
incubation. The resin was applied to the solid-phase extracting experiment
of free sphingosine from human serum at a concentration of 280 nM.
Another extraction study of edible golden oyster mushrooms showed
that the sphingoid base was selectively captured from complex natural
extracts. These results demonstrate that the developed glutaraldehyde
resin method is a highly selective method, and hence, the combination
of it with the <i>o</i>-phthaldialdehyde HPLC method was
confirmed as an efficient and sensitive method for analysis of sphingoid
bases in biological samples
