149 research outputs found
Successive Phase Transitions in a Metal-Ordered Manganite Perovskite YBaMn2O6
Structural, magnetic and electric properties of a metal-ordered perovskite
YBaMn2O6 have been studied by means of powder X-ray diffraction, DSC, magnetic
susceptibility, and electric resistivity. It is found that this material
undergoes a 1st order structural phase transition at Tc1=520 K, from a pseudo
orthorhombic (monoclinic) phase to a pseudo tetragonal (monoclinic) one.
Accompanied by this transition, the susceptibility exhibits a sharp drop, where
ferromagnetic exchange interaction becomes antiferromagnetic. Furthermore, two
more transitions, a metal-insulator transition at Tc2=480 K and an
antiferromagnetic ordering at Tc3=200 K, have been observed respectively.Comment: 4 pages, 5 figures, proceedings for ISSP
Chiroptical Polymer Functionalized by Chiral Nanofibrillar Network
Chirality is one of the basic factors that influence a wide range of activities from chemical synthesis to tissue construction in life phenomena. Recently, researchers have attempted to use chirality as an optical signal. In animals, it is used to transmit information to insects and crustaceans, and it has also been confirmed that it promotes growth in plants. This chapter presents a new organic system that produces a chiral optical signal, that is, circularly polarized luminescence (CPL), which has been attracting attention in recent years. In particular, the chapter is focused on the generating CPL through chirality induction with the chiral self-assembling phenomenon and explaining its application as an optical film
ジドウ ソウサホウ ニヨル ガン チリョウヨウ 125 I シード ホウシャセン キョウド ケンテイ システム ノ カイハツ
A new scanning system using a NaI(Tl) scintillation survey meter, copper slit and drive-unit has been
developed for quality control of radioactive seeds. Radioactive seed implants, also called brachytherapy, are
widely used modality in the treatment of early stage prostate cancers. Seeds containing the iodine-125 are most
commonly used for permanent implant prostate brachytherapy. These seeds are commercially available and
delivered in a sterile environment in the form of packaged cartridge. It is impractical to re-sterilize and re-load
seeds after calibration. This paper describes a new method to calibrate all seeds in the seed cartridge in a sterile
package
Elastogenesis in cultured dermal fibroblasts from patients with lysosomal β-galactosidase, protective protein/cathepsin A and neuraminidase-1 deficiencies
The human GLB1 gene encodes a lysosomal β-galactosidase (β-Gal) and an elastinbinding protein(EBP). Defect of the EBP as a chaperon for tropoelastin and a component of receptor complex amongneuraminidase-1 (NEU1) and protective protein/ cathepsin A(PPCA)is suggested responsible for impaired elastogenesis in autosomal recessive β-Gal, PPCA and NEU1 deficiencies. The purpose of this study is to determine effects ofGLB1, PPCA and NEU1gene mutations on elastogenesis in skin fibroblasts. Elastic fiber formation and the EBP mRNA expression were examined by immunofluorescence with an anti-tropoelastin antibody and RT-PCR selective for EBP in skin fibroblasts with these lysosomal enzyme deficiencies. Apparently normal elastogenesis and EBP mRNA expression were observed for fibroblasts from Morquio B disease cases with the GLB1 gene alleles (W273L/W273L, W273L/R482H andW273L/W509C substitutions, respectively), a galactosialidosis case with the PPCA allele (IVS7+3A/IVS7+3A) and a sialidosis case with the NEU1 allele (V217M/G243R) as well as normal subject. In this study, theW273L substitution in the EBP could impossibly cause the proposed defect of elastogenesis, and the typical PPCA splicing mutation and the V217M/G243R substitutions in the NEU1 might hardly have effects on elastic fiber formation in the dermal fibroblasts
[1.1]meta-Stilbenophanes as calixarene analogs: preparation, crystal structure, and cis-trans photoisomerization
Abstract-Three isomers of [1.1]meta-stilbenophane were synthesized by the McMurry reaction of diarylmethane dialdehyde and their crystal structures and photochemical properties were investigated. X-ray crystallographic analyses of these isomers revealed that they were assigned to a trans-trans (t-t) form with a 1,3-alternate conformation, a cis-trans (c-t) form with a distorted-cone conformation, and a cis-cis (c-c) form with a 1,2-alternate conformation. A 1 H NMR study indicated that a t-t isomer could be completely transformed into a 35:65 mixture of c-t and c-c isomers by photoirradiation at 254 nm
プレート沈み込み帯における地震波低速度層―地震発生への影響と探査法
low-velocity zonesubduction zoneearthquake rupture processtrapped wavedownhole seismic observationSubduction zone drilling into a seismogenic zone has recently been planned to understand the mechanics of large thrust earthquakes. We review studies on fault zone structures in land areas and fault mechanics studies related to the fault zones. We also point out possibilities of estimating the parameters of slip-weakening and/or rate and state dependent friction laws from a parameter of thickness of fault gouges or of fault damaged zones observed in the borehole. Two types of low velocity zone, the fault and the oceanic crust low-velocity zones (FLVZ and CLVZ), can be expected along the subduction zone plate-boundary. Delineations of FLVZ and CLVZ clarify the frictional properties of the sunduction zone plate-boundary and detailed structures of the subducting oceanic crust at deeper parts. The trapped wave observation in the subduction zone borehole is a useful tool for delineating FLVZ and CLVZ in the upper parts of the subducting slab
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