Supersymmetry on Lattice Using Ginsparg-Wilson Relation

The Ginsparg-Wilson(G-W) relation for chiral symmetry is extended for a supersymmetrical(SUSY) case on a lattice. It is possible to define exact lattice supersymmetry which are devided into two different cases according to using difference operators. $U(1)_R$ symmetry on the lattice is also realized as one of exact symmetries. For an application, the extended G-W relation is given for a two-dimensional model with chiral multiplets.Comment: Lattice 2000 (Supersymmetry, Poster), 4 page

Overlap lattice fermion in a gravitational field

We construct a lattice Dirac operator of overlap type that describes the propagation of a Dirac fermion in an external gravitational field. The local Lorentz symmetry is manifestly realized as a lattice gauge symmetry, while it is believed that the general coordinate invariance is restored only in the continuum limit. Our doubler-free Dirac operator satisfies the conventional Ginsparg-Wilson relation and possesses gamma_5 hermiticity with respect to the inner product, which is suggested by the general coordinate invariance. The lattice index theorem in the presence of a gravitational field holds, and the classical continuum limit of the index density reproduces the Dirac genus. Reduction to a single Majorana fermion is possible for 8k+2 and 8k+4 dimensions, but not for 8k dimensions, which is consistent with the existence of the global gravitational/gauge anomalies in 8k dimensions. Other Lorentz representations, such as the spinor-vector and the bi-spinor representations, can also be treated. Matter fields with a definite chirality (with respect to the lattice-modified chiral matrix) are briefly considered.Comment: 22 pages, uses PTPTeX.cls, the final version to appear in Prog. Theor. Phy

Phonon effects on X-ray absorption and X-ray photoemission spectra

International audienceSome important phonon effects observed in X-ray absorption and X-ray photoemis-sion spectra are discussed on the basis of nonequilibrium Green's function theory. For the pre-edge structures, the intensity associated with forbidden electric dipole transition is sensitive to temperature compared with allowed electric quadrupole transition. We also discuss the FC and their interference, which have negligible contribution to pre-edge intensity and energy shift. The quasi-particle energy is also influenced by the core displacement which can be responsible for the peak shift of the pre-edges. We also discuss the photoelectron angular distribution caused by the thermal atomic vibration

Molecular analysis on germline mutation caused by low-dose irradiation

Genetic heterogeneity and a low frequency of germline mutation at single-copy gene loci have limited the direct measurement of germline mutation in human populations. Two confl icting results have been reported for the effect of ionizing radiation on germline mutation in human populations. A study conducted on the fi rst-generation progeny of the survivors of the atomic bombs at Hiroshima and Nagasaki found no signifi cant increase in germline mutations. On the other hand, a signifi cant increase in germline mutation was reported among the human population in the Belarus area after the Chernobyl accident in 1986. We investigated the germline mutation at the molecular level using experimental mouse strains with different genetic backgrounds to assess the risk of ionizing radiation on human populations. The C3H male parents were exposed to X ray (0, 0.3, 1, and 3Gy) and mated with unexposed C57BL females after two weeks interval, so as to detect the germline mutation occurred at the spermatid stage. Genomic DNA samples were prepared from the both parents and F1s, and the genomic DNA sequences were compared between parents and offspring at the specifi c genomic gene loci, such as adenine phosphoribosyl transferase (aprt) gene and cytidine triphosphate synthetase (ctps) gene, using the automated DNA sequencer. Also hypervariable Pc-1 (Ms6-hm) minisatellite repeat locus was analyzed by using Southern blot hybridization technique. Our preliminary results indicated that the changes of the restriction DNA fragment length in offspring did not refl ect the occurrence of the mutation, such as point mutation, insertion, and deletion, in the genomic gene loci including the intervening sequence (intron).第１２回国際放射線研究会

Gene expression in PBMCs from 20 patients with IgG4-RD, before and after steroid treatment.

<p>(A) CLC; Charcot—Leyden crystal protein. (B) IL8RA; interleukin 8 receptor alpha. (C) IL8RB; interleukin 8 receptor beta. (D) MS4A3; membrane-spanning 4-domain subfamily A member 3. (E) DEFA3; defensin alpha 3. (F) DEFA4; defensin alpha 4. Levels of CLC, IL8RA and IL8RB mRNA were not altered in IgG4-RD patients by steroid therapy (A-C), whereas those of MS4A3, DEFA3 and DEFA4 were significantly increased following steroid therapy (D-F, p<0.01).</p