16 research outputs found
Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions
We have investigated low-temperature crystal structure of BiCh2-based
compounds LaO1-xFxBiSSe (x = 0, 0.01, 0.02, 0.03, and 0.5), in which anomalous
two-fold-symmetric in-plane anisotropy of superconducting states has been
observed for x = 0.5. From synchrotron X-ray diffraction experiments, a
structural transition from tetragonal to monoclinic was observed for x = 0 and
0.01 at 340 and 240 K, respectively. For x = 0.03, a structural transition and
broadening of the diffraction peak were not observed down to 100 K. These facts
suggest that the structural transition could be suppressed by 3% F substitution
in LaO1-xFxBiSSe. Furthermore, the crystal structure for x = 0.5 at 4 K was
examined by low-temperature (laboratory) X-ray diffraction, which confirmed
that the tetragonal structure is maintained at 4 K for x = 0.5. Our results
suggest that the two-fold-symmetric in-plane anisotropy of superconducting
states observed for LaO0.5F0.5BiSSe was not originated from structural symmetry
lowering.Comment: 15 pages, 5 figures + 3 supplemental figure
Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states with possibility of small orbital magnetic moment
Ferromagnetism was observed in a Pt(100) ultrathin film deposited on a
SrTiO3(100) substrate. The ferromagnetism, which appears in films with
thicknesses of 2.2-4.4 nm, periodically changes with a period of approximately
1 nm (5-6 ML) depending on the film thickness. This is consistent with the
period derived from the quantum-well states formed in the thin film. X-ray
magnetic circular dichroism measurements were conducted to understand the
intrinsic nature of the ferromagnetism in the Pt(100) ultrathin films, and
contrary to our expectations, the orbital magnetic moment of pure Pt is much
smaller than that of the Pt/ferromagnetic multilayer system. These results
suggest that the origin of the large magnetic anisotropy in Pt components
cannot be explained only by the amount of spin-orbit coupling in Pt.Comment: 7 pages, 4 figure
Three-dimensional electronic structure in ferromagnetic with breathing kagome bilayers
A large anomalous Hall effect (AHE) has been observed in ferromagnetic
with breathing kagome bilayers. To understand the
underlying mechanism for this, we investigate the electronic structure of
by angle-resolved photoemission spectroscopy
(ARPES). In particular, we use both vacuum ultraviolet light (VUV) and soft x
ray (SX), which allow surface-sensitive and relatively bulk-sensitive
measurements, respectively, and distinguish bulk states from surface states,
which should be unlikely related to the AHE. While VUV-ARPES observes
two-dimensional bands mostly due to surface states, SX-ARPES reveals
three-dimensional band dispersions with a periodicity of the rhombohedral unit
cell in the bulk. Our data show a good consistency with a theoretical
calculation based on density functional theory, suggesting a possibility that
is a magnetic Weyl semimetal.Comment: 6 pages, 4 figure
Regulated C-C motif ligand 2 (CCL2) in luteal cells contributes to macrophage infiltration into the human corpus luteum during luteolysis
Intense macrophage infiltration is observed during luteolysis in various animals including women; however, we still do not know how macrophage infiltration into the human corpus luteum (CL) during luteolysis is regulated. In this study, we examined the expression, localization and regulation of an important chemokine for the recruitment of monocyte/macrophage lineages, C-C motif ligand 2 (CCL2), in the human CL across the luteal phase and in cultured human luteinized granulosa cells (LGCs), with special reference to the number of infiltrating macrophages and luteal cell function. CCL2 mRNA increased in the non-functional regressing CL during menstruation (P < 0.01), corresponding to an elevated mRNA expression of a macrophage-derived cytokine, tumor necrosis factor (TNF), and an increased number of infiltrating macrophages positively stained with a macrophage marker, CD68. CCL2 protein was immunohistochemically localized to the cytoplasm of granulosa-lutein and theca-lutein cells, and CCL2 mRNA was significantly reduced by hCG both in vivo (P < 0.05) and in vitro (P < 0.01). CCL2 was also down-regulated by luteotrophic prostaglandin (PG) E (P < 0.0001), but up-regulated by luteolytic PGF (P < 0.05) in vitro. Administration of TNF significantly enhanced the CCL2 mRNA expression in cultured LGCs (P < 0.01). A greater abundance of infiltrating macrophages were found around granulosa-lutein cells lacking 3 beta-HSD or PGE synthase (PGES) immunostaining. CCL2 mRNA expression was negatively correlated with both HSD3B1 and PGES, suggesting that locally produced progesterone and PGE suppress macrophage infiltration into the CL. Taken together, the infiltration of macrophages in the human CL is regulated by endocrine and paracrine molecules via regulation of the CCL2 expression in luteal cells.Supplementary data are available at http://molehr.oxfordjournals.org/http://molehr.oxfordjournals.org/lookup/suppl/doi:10.1093/molehr/gav028/-/DC
Agent-based model using GPS analysis for infection spread and inhibition mechanism of SARS-CoV-2 in Tokyo
Abstract Analyzing the SARS-CoV-2 pandemic outbreak based on actual data while reflecting the characteristics of the real city provides beneficial information for taking reasonable infection control measures in the future. We demonstrate agent-based modeling for Tokyo based on GPS information and official national statistics and perform a spatiotemporal analysis of the infection situation in Tokyo. As a result of the simulation during the first wave of SARS-CoV-2 in Tokyo using real GPS data, the infection occurred in the service industry, such as restaurants, in the city center, and then the infected people brought back the virus to the residential area; the infection spread in each area in Tokyo. This phenomenon clarifies that the spread of infection can be curbed by suppressing going out or strengthening infection prevention measures in service facilities. It was shown that pandemic measures in Tokyo could be achieved not only by strong control, such as the lockdown of cities, but also by thorough infection prevention measures in service facilities, which explains the curb phenomena in real Tokyo