74 research outputs found
Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO2
Extremely large magnetoresistance is realized in the nonmagnetic layered
metal PdCoO2. In spite of a highly conducting metallic behavior with a simple
quasi-two-dimensional hexagonal Fermi surface, the interlayer resistance
reaches up to 35000% for the field along the [1-10] direction. Furthermore, the
temperature dependence of the resistance becomes nonmetallic for this field
direction, while it remains metallic for fields along the [110] direction. Such
severe and anisotropic destruction of the interlayer coherence by a magnetic
field on a simple Fermi surface is ascribable to orbital motion of carriers on
the Fermi surface driven by the Lorentz force, but seems to have been largely
overlooked until now.Comment: Phys. Rev. Lett. 111, 056601 (2013
Rb-Sr age of an impact event recorded in Yamato-791088 H chondrite
The age of the impact event is recorded in Yamato(Y)-791088,a high-iron type chondrite and has been dated using the Rb-Sr chronometer. A brief mineralogical characterization was made of the chondrite as well. The obtained impact age is 1024±47Ma. When Y-791088 recorded the impact event, it might not have been on the surface of the parent body, but rather deep. Therefore, some sulfide was not vaporized and Rb was not lost during the impact. Metal phases were once homogenized and plessite, consisting of two phases, is really scarce. After the impact, the parental body could not have lasted long before separating into pieces
Phase Diagram of Pressure-Induced Superconductivity in EuFe2As2 Probed by High-Pressure Resistivity up to 3.2 GPa
We have constructed a pressuretemperature () phase diagram of
-induced superconductivity in EuFeAs single crystals, via
resistivity () measurements up to 3.2 GPa. As hydrostatic pressure is
applied, an antiferromagnetic (AF) transition attributed to the FeAs layers at
shifts to lower temperatures, and the corresponding resistive
anomaly becomes undetectable for 2.5 GPa. This suggests that the
critical pressure where becomes zero is about 2.5
GPa. We have found that the AF order of the Eu moments survives up to
3.2 GPa without significant changes in the AF ordering temperature
. The superconducting (SC) ground state with a sharp transition
to zero resistivity at 30 K, indicative of bulk
superconductivity, emerges in a pressure range from 2.5
GPa to 3.0 GPa. At pressures close to but outside the SC phase, the
curve shows a partial SC transition (i.e., zero resistivity is not
attained) followed by a reentrant-like hump at approximately
with decreasing temperature. When nonhydrostatic pressure with a uniaxial-like
strain component is applied using a solid pressure medium, the partial
superconductivity is continuously observed in a wide pressure range from 1.1
GPa to 3.2 GPa.Comment: 7 pages, 6 figures, accepted for publication in Physical Review B,
selected as "Editors' Suggestion
Effects of 3 Years of Treatment with a Selective Estrogen Receptor Modulator for Postmenopausal Osteoporosis on Markers of Bone Turnover and Bone Mineral Density
Aim: The aim of the present study was to assess the changes in bone mineral density and bone turnover markers in long-term SERM. Methods: The study was performed on 25 female outpatients with primary osteoporosis treated at the Osteoporosis Department of Showa University School of Medicine. All patients had been on raloxifene (60mg/day) for ≥ 3 years. The mean patient age was 67.1 years and the women were, on average, 18.4 years postmenopausal. Levels of bone turnover markers (urinary naltrexone [NTX] and bone-specific alkaline phosphatase [BAP]) and bone mineral density (BMD; front lumbar vertebrae, three proximal femur sites, and two distal radius sites) were determined before and then annually after starting raloxifene for a period of 3 years. Results: Over the 3-year treatment period, significant decreases were seen in both urinary NTX and BAP levels. Although BMD of the lumbar vertebrae and distal radius was increased over the 3 years after initiation of raloxifene treatment, the difference failed to reach statistical significance. The BMD of the femoral neck decreased, whereas that of the femoral trochanter and femoral intertrochanter area increased. Conclusions: The selective estrogen receptor modulator raloxifene is suitable for the treatment of osteoporosis in postmenopausal patients because it reduces bone turnover while maintaining adequate bone density
Microwave Radar Sensor Modules
Systems and methods for detecting biometrics using microwave radar sensor modules are disclosed. Integrated microwave sensor modules can include a transmitter unit configured to generate at least one continuous wave transmit signal based upon at least one frequency control signal, a receiver unit configured to utilize a cancellation path to cancel contributions to a return signal based upon at least one cancellation path control signal, and a microcontroller unit that includes a processor, a memory containing a microcontroller application, where the microcontroller application configures the processor to generate at least one frequency control signal to generate least one CW transmit signal having a plurality of frequencies, generate at least one cancellation path control signal to automatically adjust the cancellation path in real time, receive at least one demodulated signal, digitize the at least one demodulated signal, and update the at least one frequency control and cancellation path control signals
Polymorphic mutations in mouse mitochondrial DNA regulate a tumor phenotype
To examine whether polymorphic mtDNA mutations that do not induce significant respiration defects regulate phenotypes of tumor cells, we used mouse transmitochondrial tumor cells (cybrids) with nuclear DNA from C57BL/6 (B6) strain and mtDNA from allogenic C3H strain. The results showed that polymorphic mutations of C3H mtDNA in the cybrids induced hypoxia sensitivity, resulting in a delay of tumor formation on their subcutaneous inoculation into B6 mice. Therefore, the effects of polymorphic mutations in normal mtDNA have to be carefully considered, particularly when we apply the gene therapy to the embryos to replace their pathogenic mtDNA by normal mtDNA
The innate immune system in host mice targets cells with allogenic mitochondrial DNA
Tumors or embryonic stem cells bearing foreign mitochondrial DNA are rejected by the innate immune system via a mechanism that depends on MyD88
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