5,713 research outputs found
Knight Shift and Nuclear Spin Relaxation Rate in a Charge-Ordered State of the One-Dimensional Extended Hubbard Model at Quarter Filling
We investigate Knight shift and nuclear spin relaxation rate in a charge
ordered state of the one-dimensional extended Hubbard model with a quarter
filled band by using RPA around the mean-field solution. It is shown that both
quantities show splitting below the critical temperature of the charge order,
as is experimentally observed. The relationship between the mount of the
splitting in the both quantities and the charge disproportionation rate is
discussed.Comment: 7 pages, 6 figures, submitted to J. Phys. Soc. Jp
Plasma properties and Stokes profiles during the lifetime of a photospheric magnetic bright point
Aims: to investigate the evolution of plasma properties and Stokes parameters
in photospheric magnetic bright points using 3D magneto-hydrodynamical
simulations and radiative diagnostics of solar granulation. Methods: simulated
time-dependent radiation parameters and plasma properties were investigated
throughout the evolution of a bright point. Synthetic Stokes profiles for the
FeI 630.25 nm line were calculated, which allowed the evolution of the Stokes-I
line strength and Stokes-V area and amplitude asymmetries to also be
investigated. Results: our results are consistent with theoretical predictions
and published observations describing convective collapse, and confirm this as
the bright point formation process. Through degradation of the simulated data
to match the spatial resolution of SOT, we show that high spatial resolution is
crucial for the detection of changing spectro-polarimetric signatures
throughout a magnetic bright point's lifetime. We also show that the signature
downflow associated with the convective collapse process is reduced towards
zero as the radiation intensity in the bright point peaks, due to the magnetic
forces present restricting the flow of material in the flux tube.Comment: 14 pages, 12 figures, accepted to A&
Radiative rates and electron impact excitation rates for transitions in He II
We report calculations of energy levels, radiative rates, collision
strengths, and effective collision strengths for transitions among the lowest
25 levels of the n <= 5 configurations of He~II. The general-purpose
relativistic atomic structure package (GRASP) and Dirac atomic R-matrix code
(DARC) are adopted for the calculations. Radiative rates, oscillator strengths,
and line strengths are reported for all electric dipole (E1), magnetic dipole
(M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions among
the 25 levels. Furthermore, collision strengths and effective collision
strengths are listed for all 300 transitions among the above 25 levels over a
wide energy (temperature) range up to 9 Ryd (10**5.4 K). Comparisons are made
with earlier available results and the accuracy of the data is assessed.Comment: 30 pages of text including 12 figures and 5 Tables will appear in
ATOMS 5 (2017
The Difference a Day Makes: How Courts Circumvent Federal Immigration Law at Sentencing
Efforts in criminal courts to avoid deportation as a result of convictions are prevalent throughout the United States. Although defendants in Washington have a statutory right to be advised of the potential immigration consequences of a guilty plea, there is no statutory or constitutional requirement that a judge take immigration consequences into consideration in imposing sentence. Nonetheless, as was the case in the assault on Micah Painter, judges can and do make what are effectively policy judgments when sentencing defendants, with an eye toward helping them avoid deportation
Isolation of tributyltin-degrading bacteria citrobacter braakii and enterobacter cloacae from butyltin-polluted sediment
Tributyltin compound (TBT) released into the aquatic environment is generally degraded by bacteria in water and sediment. The isolation of TBT-degrading bacteria from TBT polluted sediment leads to the indication of specific potential TBT degraders. Two new strains of bacteria designated as B2 and B3 were successfully isolated using glycerol medium containing tributyltin chloride (TBTC) at 130 μM from contaminated sediment collected from Bowling Basin in Glasgow. The observed degradation after 14 days of the microcosm from the sediment and the isolated bacteria were investigated at an initial concentration of 1 μM TBTC. It was found that TBT was degraded by the bacterial strains B2 and B3 at 8.3 and 16.9 %, respectively. The results indicate that B2 and B3 are effective as TBT degraders. EC50 of B2 and B3 in water were 88.73 and 112.53 μM TBTC, which were significantly higher than the concentration of TBT measured at the basin, suggesting a low effect of TBT on the growth and activity of bacteria. After identification using API 20E and 16S sequencing, the bacterial isolate strain B2 is Citrobacter braakii and B3 is Enterobacter cloacae. Therefore, this study has discovered two species of high resistance TBT degrader which have never been previously studied or isolated based upon TBT degradation ability
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Transcriptome Profiling of Buffalograss Challenged with the Leaf Spot Pathogen Curvularia inaequalis
Buffalograss (Bouteloua dactyloides) is a low maintenance United States native turfgrass species with exceptional drought, heat and cold tolerance. Leaf spot caused by Curvularia inaequalis negatively impacts buffalograss visual quality. Two leaf spot susceptible and two resistant buffalograss lines were challenged with C. inaequalis. Samples were collected from treated and untreated leaves when susceptible lines showed symptoms. Transcriptome sequencing was done and differentially expressed genes were identified. Approximately 27 million raw sequencing reads were produced per sample. More than 86% of the sequencing reads mapped to an existing buffalograss reference transcriptome. De novo assembly of unmapped reads was merged with the existing reference to produce a more complete transcriptome. There were 461 differentially expressed transcripts between the resistant and susceptible lines when challenged with the pathogen and 1552 in its absence. Previously characterized defense-related genes were identified among the differentially expressed transcripts. Twenty one resistant line transcripts were similar to genes regulating pattern triggered immunity and 20 transcripts were similar to genes regulating effector triggered immunity. There were also nine up-regulated transcripts in resistance lines which showed potential to initiate systemic acquired resistance (SAR) and three transcripts encoding pathogenesis-related proteins which are downstream products of SAR. This is the first study characterizing changes in the buffalograss transcriptome when challenged with C. inaequalis
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