1,928 research outputs found
Search for Axion like particles using Laue-case conversion in a single crystal
Axion Like Particles (ALPs) with a sub-keV range mass are searched by using
the light-shining-through-a-wall technique. A novel system is developed in
which injected X rays are converted and reconverted by the Laue-case conversion
within a silicon single crystal with dual blades. The resonant ALPs' mass of
the conversion is scanned by varying the X-ray injection angle to the crystal.
No significant signals are observed, and 90% C. L. upper limits on the ALP-two
photon coupling constant are obtained as follows, g_{a\gamma\gamma} < 4.2
\times 10^{-3} GeV^{-1} (m_a < 10 eV), g_{a\gamma\gamma} < 5.0 \times 10^{-3}
GeV^{-1} (46 eV < m_a < 1020 eV). These are the most stringent laboratorial
constraints on ALPs heavier than 300 eV.Comment: 13 pages, 5 figures, 1 tabl
Field excursion to enhance coastal and environmental engineering capacities of engineers in administrative positions
The capacity building of coastal administrators is essential for sustainable coastal zone management. In order to enhance the ability of trainees in coastal and environmental engineering, the College of Land, Infrastructure, Transport and Tourism of the Japanese Government has carried out annual field excursions to Kujukuri Beach, a typical sandy beach in central Japan for comprehensively learning about real phenomena occurring on the beach and in the hinterland. This paper describes the excursion in 2011, in which 20 trainees participated. The importance of learning through the field excursions to coasts is discussed
c-Jun represses the human insulin promoter activity that depends on multiple cAMP response elements.
Structural, Electronic, and Magnetic Properties of MnO
We calculate the structural, electronic, and magnetic properties of MnO from
first principles, using the full-potential linearized augmented planewave
method, with both local-density and generalized-gradient approximations to
exchange and correlation. We find the ground state to be of rhombohedrally
distorted B1 structure with compression along the [111] direction,
antiferromagnetic with type-II ordering, and insulating, consistent with
experiment. We show that the distortion can be understood in terms of a
Heisenberg model with distance dependent nearest-neighbor and
next-nearest-neighbor couplings determined from first principles. Finally, we
show that magnetic ordering can induce significant charge anisotropy, and give
predictions for electric field gradients in the ground-state rhombohedrally
distorted structure.Comment: Submitted to Physical Review B. Replaced: regenerated figures to
resolve font problems in automatically generated pd
Fission yeast 26S proteasome mutants are multi-drug resistant due to stabilization of the pap1 transcription factor
Here we report the result of a genetic screen for mutants resistant to the microtubule poison methyl benzimidazol-2-yl carbamate (MBC) that were also temperature sensitive for growth. In total the isolated mutants were distributed in ten complementation groups. Cloning experiments revealed that most of the mutants were in essential genes encoding various 26S proteasome subunits. We found that the proteasome mutants are multi-drug resistant due to stabilization of the stress-activated transcription factor Pap1. We show that the ubiquitylation and ultimately the degradation of Pap1 depend on the Rhp6/Ubc2 E2 ubiquitin conjugating enzyme and the Ubr1 E3 ubiquitin-protein ligase. Accordingly, mutants lacking Rhp6 or Ubr1 display drug-resistant phenotypes
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