1,363 research outputs found
Energy transfer from intense laser pulse to dielectrics in time-dependent density functional theory
Energy transfer processes from a high-intensity ultrashort laser pulse to
electrons in simple dielectrics, silicon, diamond, and -quartz are
theoretically investigated by first-principles calculations based on
time-dependent density functional theory (TDDFT). Dependences on frequency as
well as intensity of the laser pulse are examined in detail, making a
comparison with the Keldysh theory. Although the Keldysh theory reliably
reproduces the main features of the TDDFT calculation, we find some deviations
between results by the two theories. The origin of the differences is examined
in detail
Random Wandering Around Homoclinic-like Manifolds in Symplectic Map Chain
We present a method to construct a symplecticity preserving renormalization
group map of a chain of weakly nonlinear symplectic maps and obtain a general
reduced symplectic map describing its long-time behaviour. It is found that the
modulational instability in the reduced map triggers random wandering of orbits
around some homoclinic-like manifolds, which is understood as the Bernoulli
shifts.Comment: submitted to Prog. Theor. Phy
31P-nuclear magnetic resonance studies of intact plasmodia of Physarum polycephalum
Abstract31P-nuclear magnetic resonance spectra were obtained from intact plasmodial cells of Physarum polycephalum, where cytoplasmic streaming is generated by actin-myosin-ATP interaction. Several peaks were resolved and identified. They included ATP, ADP, orthophosphate and polyphosphates. Peaks for phosphocreatine, phosphoarginine or AMP were not detected. The intracellular pH and concentrations of ATP and free Mg2+ were estimated to be pH 6.9, 0.2ā0.5 mM, and about 1 mM, respectively
The folateābinding module of Thermus thermophilus cobalaminādependent methionine synthase displays a distinct variation of the classical TIM barrel: a TIM barrel with a `twistā
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141455/1/ayd2kw5140.pd
The Nature of the Stable Soft X-ray Emissions in Several Types of Active Galactic Nuclei Observed by Suzaku
To constrain the origin of the soft X-ray excess phenomenon seen in many
active galactic nuclei, the intensity-correlated spectral analysis, developed
by Noda et al. (2011b) for Markarian 509, was applied to wide-band (0.5-45 keV)
Suzaku data of five representative objects with relatively weak reflection
signature. They are the typical bare-nucleus type 1 Seyfert Fairall 9, the
bright and typical type 1.5 Seyfert MCG-2-58-22, 3C382 which is one of the
X-ray brightest broad line radio galaxies, the typical Seyfert-like radio loud
quasar 4C+74.26, and the X-ray brightest radio quiet quasar MR2251-178. In all
of them, soft X-ray intensities in energies below 3 keV were tightly correlated
with that in 3-10 keV, but with significant positive offsets. These offsets,
when calculated in finer energy bands, define a stable soft component in 0.5-3
keV. In each object, this component successfully explained the soft excess
above a power-law fit. These components were interpreted in several alternative
ways, including a thermal Comptonization component which is independent of the
dominant power-law emission. This interpretation, considered physically most
reasonable, is discussed from a viewpoint of Multi-Zone Comptonization, which
was proposed for the black hole binary Cygnus X-1 (Makishima et al. 2008).Comment: 18 pages, 12 figures, 7 table
Immunohistochemical characterization of the lymphocyte and the immunoglobulin-containing cell in the epithelium and the lamina propria of normal human intestines.
In order to clarify difference of the mucosal immunity in various sites of normal large and small intestines, we studied the population of lymphocyte subsets and immunoglobulin (Ig)-containing cells in situ in biopsy specimens taken from various sites (ascending colon, sigmoid colon and rectum) of the large intestine and from the duodenum using an immunohistochemical method. Monoclonal antibodies against pan-T (Leu 1), cytotoxic/suppressor T (Leu2a), helper/inducer T (Leu3a), suppressor T (Leu15) and natural killer/K (Leu7) cells, and polyclonal antibodies to human IgG, IgA and IgM were used. In the duodenum, intraepithelial lymphocytes (IELs) were more prominent than in the large intestine. Immunoelectron microscopic observation revealed that some Leu2a+ IELs possessed pseudopods extending into intestinal epithelial cells, indicating that some IELs belong to the cytotoxic T cell subset. Leu7+ IELs were scarcely observed and Leu7+/Leu1+ ratio was higher in the large intestine than in the duodenum. Furthermore, the number of Leu7+ cells were more in the distal than the proximal colon. In the lamina propria Ig-containing cells tended to be fewer in the rectum than in the duodenum and the proximal colon. Our findings may suggest the variation of local immune responses and the difference of assigned immunological functions among the various sites of the intestines.</p
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