We investigate magnetic properties of a strongly interacting ultracold Fermi gas. Within the framework of an extended T-matrix approximation, we calculate the spin susceptibility χ in the unitarity ...limit. We show that effects of pairing fluctuations on this magnetic quantity are quite different in between the normal state and the superfluid phase. In the normal state, pairing fluctuations cause spin-gap phenomenon near the superfluid phase transition temperature Tc, where χ is anomalously suppressed. In the superfluid phase, on the other hand, the ordinary suppression of χ by the BCS energy gap is weakened by pairing fluctuations, because they induce finite density of states inside the gap. Our results indicate that the spin susceptibility is a useful quantity for the study of pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas.
Abstract Background Small intestinal ischemia-reperfusion (I/R) injury, a clinically important condition, induces severe organ damage. Ischemic preconditioning (IPC) produces tolerance to long-term ...I/R by inducing a short-term I/R. Herein, we have examined the reduction in the extent of injury by IPC. Methods Small intestinal I/R injury was induced in rats by clamping the superior mesenteric artery (SMA) for 30 minutes followed by reperfusion for various 30 minutes. The IPC + I/R group underwent a short-term I/R (IPC) prior to long-term I/R. Nuclear factor-κB (NF-κB) activity was analyzed by an electrophoretic mobility shift assay and cytokine mRNA levels, by reverse transcription-polymerase chain reaction. Apoptosis-related genes were analyzed by Western blotting and immunohistochemistry, and apoptotic cells, by TUNEL staining. Results The animals were subjected to 30 minutes of ischemia followed by 30 minutes of reperfusion. NF-κB activity increased in the I/R group and decreased in the IPC + I/R group. The IPC + I/R group showed decreased cytokine in mRNA levels. Expression of the proapoptotic gene caspase-3 was increased in the I/R and decreased in the IPC + I/R group. Expression of the antiapoptotic gene Bcl-xL was increased in the IPC + I/R group. The number of apoptotic cells was increased in the I/R and decreased in the IPC + I/R group. Conclusion Small intestinal I/R injury was reduced by IPC produced by clamping the SMA; thus, IPC may have potential clinical applications in the future.
Deep sub-micron FD-SOI for front-end application Ikeda, H.; Arai, Y.; Hara, K. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2007, Letnik:
579, Številka:
2
Journal Article
Recenzirano
Odprti dostop
In order to confirm benefits of a deep sub-micron FD-SOI and to identify possible issues concerning front-end circuits with the FD-SOI, we have submitted a small design to Oki Electric Industry Co., ...Ltd. via the multi-chip project service of VDEC, the University of Tokyo. The initial test results and future plans for development are presented.
Compton telescopes based on semiconductor technologies are being developed to explore the gamma-ray universe in an energy band 0.1-20 MeV, which is not well covered by the present or near-future ...gamma-ray telescopes. The key feature of such Compton telescopes is the high energy resolution that is crucial for high angular resolution and high background rejection capability. The energy resolution around 1 keV is required to approach physical limit of the angular resolution due to Doppler broadening. We have developed a low noise front-end ASIC (application-specific integrated circuit), VA32TA, to realize this goal for the readout of double-sided silicon strip detector (DSSD) and cadmium telluride (CdTe) pixel detector which are essential elements of the semiconductor Compton telescope. We report on the design and test results of the VA32TA. We have reached an energy resolution of 1.3 keV full-width at half-maximum (FWHM) for 60 and 122 keV at 0/spl deg/ C with a DSSD and 1.7 keV (FWHM) with a CdTe detector.
The specific binding component for prostaglandin F(2α) (PGF(2α)) that exists in the plasma membrane fraction of the oviduct uterus myometrium of laying hens was shown to possess receptor properties ...for PGF(2α), such as binding specificity to PGF(2α), binding saturation, high affinity, and limited capacity. The value of the equilibrium dissociation constant (K(d)) for the receptor was not different between laying hens and nonlaying hens, but the value of the maximum binding capacity (B(max)) was smaller in laying hens than in nonlaying hens. During an oviposition cycle, the K(d) value did not show a significant change, but the B(max) value decreased at 3 and 0.5 h before oviposition and 2 h after oviposition. Neither the K(d) nor B(max) value changed in nonlaying hens during a 24-h period. An intravenous injection of PGF(2α) (5 μg/hen) decreased the B(max) value, but not the K(d) value, of the PGF(2α) receptor. It is thought from the results that PGF(2α) may act directly on the oviduct uterus myometrium at a fixed time before and after oviposition in laying hens.
Polarization measurements in the X-ray and gamma-ray energy range can provide crucial information on massive compact objects such as black holes and neutron stars. The Polarized Gamma-ray Observer ...(PoGO) is a new balloon-borne instrument designed to measure polarization from astrophysical objects in the 30–100
keV range, under development by an international collaboration with members from United States, Japan, Sweden and France. To examine PoGO's capability, a beam test of a simplified prototype detector array was conducted at the Argonne National Laboratory Advanced Photon Source. The detector array consisted of seven plastic scintillators, and was irradiated by polarized photon beams at 60, 73 and 83
keV. The data showed a clear polarization signal, with a measured modulation factor of
0.42
±
0.01
. This was successfully reproduced at the 10% level by the computer simulation package Geant4 after modifications to its implementation of polarized Compton/Rayleigh scattering. Details of the beam test and the validation of the Geant4 simulations are presented.
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