Search Results - (Author, Cooperation:M. Abe)

2018-10-23

American Physical Society (APS)

1050-2947

1094-1622

Physics

Atomic and molecular structure and dynamics ; high-precision measurements

2018-03-22

American Physical Society (APS)

1050-2947

1094-1622

Physics

Atomic and molecular structure and dynamics

2018-09-28

American Physical Society (APS)

1050-2947

1094-1622

Physics

Atomic and molecular structure and dynamics ; high-precision measurements

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2011-08-27

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2013-01-11

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Animals ; Bone Marrow/immunology ; Bone Marrow Cells/cytology/immunology ; Bone Marrow Transplantation/*immunology ; Cell Cycle Proteins/immunology/metabolism ; Cell Differentiation/*immunology ; Embryonic Stem Cells/*cytology/immunology ; Gene Expression Profiling ; Induced Pluripotent Stem Cells/*cytology/immunology ; Male ; Membrane Proteins/immunology/metabolism ; Mice ; Mice, Inbred C57BL ; Skin/cytology/immunology ; Skin Transplantation/*immunology ; Teratoma/immunology/pathology

2012-01-28

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Amino Acid Sequence ; Animals ; Cell Line ; Cerebellar Diseases/*genetics/metabolism/pathology ; Cilia/metabolism/*ultrastructure ; Conserved Sequence ; DNA, Intergenic ; *Evolution, Molecular ; Eye Abnormalities/*genetics/metabolism/pathology ; Gene Expression Profiling ; *Gene Expression Regulation ; Genetic Heterogeneity ; *Genetic Loci ; Humans ; Kidney Diseases, Cystic/*genetics/metabolism/pathology ; Membrane Proteins/chemistry/*genetics/metabolism ; Molecular Sequence Data ; Multigene Family ; Mutation ; Mutation, Missense ; Phenotype ; Protein Transport ; *Regulatory Sequences, Nucleic Acid ; Retina/abnormalities/metabolism/pathology ; Transport Vesicles/metabolism/ultrastructure

2012-02-22

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Aging/*genetics ; Animals ; Brain/metabolism/pathology ; *Disease Models, Animal ; Down-Regulation ; Drosophila Proteins/biosynthesis/genetics ; Drosophila melanogaster/*genetics/*physiology ; Female ; Gene Expression Regulation/*genetics ; Hot Temperature ; Humans ; Longevity/genetics ; Male ; MicroRNAs/*genetics ; Mutation ; Neurodegenerative Diseases/*genetics/pathology ; Protein Biosynthesis ; RNA, Messenger/analysis/genetics ; Survival Analysis ; Time Factors ; Transcription Factors/biosynthesis/genetics ; Up-Regulation

1439-0264

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

The bovine pregnant corpus luteum was examined morphologically, to clarify the appearance and properties of the intramitochondrial bodies (IMB) in mitochondria of the large luteum cell (LLC). The incidence and diameter of the IMB (200–900 nm) showed a tendency to increase with the advance of pregnancy.Histochemically, the IMB reacted positively with protein, and immunohistochemically, they reacted IMB with 11 α-hydroxyprogesterone-1-11 succinyl-bovine serum albumin (P-BSA). The IMB seemed to combine with protein, and these granules did not undergo exocytosis. The cytoplasm of LLC contained another type of small electron-dense granules that were 150–200 nm in diameter, had an orifice for secretion, and reacted with relaxin. Small luteum cells (SLC) revealed crystalline-like inclusions. It is suggested that these inclusion cells participate in the synthesis of steroids.

Electronic Resource

1437-2320

Key words Brain check-up ; Cerebrovascular disease ; Signal intensity ; Sonic detection

Springer Online Journal Archives 1860-2000

Medicine

Abstract  A sonic analysis system was developed for the detection of cervical and intracranial vascular disease (CVD). In this study, sound signals detected through the patient’s forehead were analyzed using a short-time Fourier transformation method, and data were evaluated according to the intensity of spectra. A total of 49 patients with CVD and 34 control subjects were studied and classified into four grades according to the intensity of the spectra. The true positive rate was 83.7% in patients with CVD, and the true negative rate was 94.1% in the control group. The sensitivity and specificity of this analysis system were 83.7% and 5.9%, respectively. The true positive rates for cerebral stenosis/occlusion, cerebral aneurysm, and arteriovenous malformation/fistula were 85.7%, 73.7%, and 100%, respectively. The future goal is clinical application as a mass-screening test for brain disease. This system shows potential for this purpose, and further development will continue.

Electronic Resource

2018-02-10

Rockefeller University Press

0022-1007

1540-9538

Medicine

Metabolism

1089-7550

AIP Digital Archive

Physics

Sputtered Ba ferrite films are promising media for magneto-optical (MO) recording because they have strong perpendicular magnetic anisotropy. However, MO activity of the Ba ferrites is low, which makes the feasibility as a practical medium poor. The MO activity is reported to be prominently enhanced by specific ions such as Bi3+, Co2+, and light rare earth ions in garnet ferrites, while, in Ba ferrites, the MO enhancement ions except Co2+ have not yet been known. We have recently found that Ni2+ substitution also enhances Faraday rotation in the visible region around hν=2.5 eV. In this paper we describe MO properties as well as microstructures of Ba1−xMxFe12−xNixO19 (M=La, Pr, x=0, 0.3, 0.6) films prepared by rf sputtering. The films were deposited on Gd3Ga5O12 (GGG) single crystal substrates at substrate temperature (Ts) of 400–600 °C by the conventional rf diode sputtering. When Ts≥550 °C for the incident rf power over 19 W/cm2, the films in situ crystallized in Ba–ferrite single phase. They had c-crystal axis well oriented normal to the film plane. The SEM and TEM observations revealed that the grain size in the films increases from several nm to ∼300 nm with increasing the incident power. The films with larger grains showed higher saturation magnetization and lower coercivity. Faraday rotation of the films was clearly enhanced in the visible around 2.5 eV with increasing Ni2+ substitution, though they showed rather complicated spectral structure inherent to the Ba ferrites. The enhancement factor of specific Faraday rotation at 2.5 eV was as large as 2×104 deg/x, independent of the kind of the rare earth ion substituted for Ba2+ for charge compensation. This implies that the substitution of the rare earth ion itself enhances no Faraday rotation in Ba ferrites. Thus, the MO enhancement around 2.5 eV may be attributed to the octahedrally coordinated Ni2+.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Off diagonal terms (which give magneto-optical effects) of "effective dielectric tensor'' of composite material with magnetic fine particles dispersed in a dielectric matrix have been derived by the authors.1 In this study, we extended the effective tensor to the composite in which surface-oxidized metal ferromagnetic fine particles are clustered in the matrix. We proposed "magnetic cluster model'' as follows. The surface-oxidized metal particles of size d, which is much smaller than light wavelength λ (d(very-much-less-than)λ), aggregate in the matrix to form the magnetic clusters of average size D which is much larger than the wavelength (D(very-much-greater-than)λ). The composite as a whole contains the magnetic clusters at a volume fraction of F(0〈F〈1). In the cluster the surface-oxidized metal particles are dispersed at an average volume fraction of f(0〈f〈1). The surface-oxidized metal particles contain metal at an average volume fraction of g(0〈g〈1). Since d(very-much-less-than)λ, we can apply to the magnetic fine particle the effective dielectric tensor, in terms of which we can calculate the effective dielectric tensor of the magnetic cluster. On the contrary, we cannot apply the effective tensor to the composite as a whole, because D(very-much-greater-than)λ. However, Faraday rotation of the composite is given by F times the Faraday rotation of the magnetic clusters which is expressed in terms of the effective dielectric tensor of the cluster. Faraday rotation spectrum was measured at λ=0.5–0.8 μm for a composite film (0.25 μm in thickness) in which Ni fine particles (∼20 μm in size) were dispersed in PVC (polyvinyl chloride) matrix by spin coating. The result was successfully interpreted by our magnetic cluster model assuming parameters F=0.15, f=0.78, g=0.9, which conforms to our experimental conditions.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Ferrite plating facilitates the formation of polycrystalline spinel films in an aqueous solution below 100 °C. The plating temperature can be extended up to 200 °C when the pressure of the reaction solution is kept high (15–20 kgf/cm2). We call this "hydrothermal ferrite plating,'' by which solubility limit of Ni in Fe3−xNixO4 increases much, from x=0.3 (by conventional ferrite plating at 90 °C) to x=0.93.1 In this paper we describe preparation of Fe3−xCoxO4 films by the hydrothermal ferrite plating at T=120–200 °C and p=15–40 kgf/cm2, and report their structural and magnetic properties. Plating for 1 h, we obtained films about 1 μm in thickness, which are polycrystalline with no preferential crystal orientation as observed by x-ray diffraction. The solubility limit of Co, which is x=0.6 at 90 °C, increases to x=1.3 at 180 °C. The solubility limit of Co is higher than that of Ni, which may be because Ni tends to keep 2+ state in the spinel structure, while Co can take both 2+ and 3+ states. When prepared at 200 °C, the saturation magnetization of the films are smaller than that reported for bulk samples, though both agree when the films are prepared at 90 °C.2 This suggests that Co is oxidized to 3+ state even when x〈1.0 as large as the Fe3−xCoxO4 films are prepared in the hydrothermal conditions. We found that adding CH3COONH4 into the reaction solution as a pH buffer improves the smoothness of the film surface.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Polycrystalline spinel ferrite films were plated on glass substrates in an aqueous solution by the thin liquid-film method combined with an electric lamp, which was named "light-enhanced ferrite plating.'' By irradiating the substrate surface with a Xe lamp (450 W/cm2), the deposition rate of Fe3O4 films increased by a factor of ∼5–10 (from 30 to 150–320 nm/min) compared to that obtained without the light irradiation. The Fe3O4 film prepared in a reaction solution with a small FeCl2 concentration had a structure (i.e., grain size ∼200 nm, and columnar structure perpendicular to the film surface) similar to that observed when prepared without the light irradiation. However, the grain size increased and the columnar structure disappeared as the FeCl2 concentration increased. The deposition rate of Fe3−xMxO4 (M=Ni, Mn, Co, and Zn) was 50–100 nm/min and increased by a factor of 2–5 compared to that without the light irradiation. The saturation magnetization of the all films prepared with the light irradiation agrees with the value of the bulk samples.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Polycrystalline films of Y3−xBixFe5−yAlyO12 (x=0.5–2.0, y=0–1.2) were prepared on glass substrates by pyrolysis combined with spin-coating techniques. SEM and TEM studies revealed that the grain size increases with x but decreases with y. This means that enhancing the magneto-optical effect by increasing x results in large grain size, which causes a strong media noise due to light scattering at grain boundaries. To solve this problem we have made double-layer films. An underlayer of polycrystalline film low in x, hence small in grain size, was first made by a conventional pyrolysis process. On this an upper layer high in x was made. The upper layer was crystallized at a temperature ∼50 °C lower and was ten times smaller in grain size than the single-layer film with an equal x. Furthermore, the upper layer crystallized at the lower temperature (590 °C) was exceedingly homogeneous.

Electronic Resource