85 research outputs found
Modeling the pion Generalized Parton Distribution
We compute the pion Generalized Parton Distribution (GPD) in a valence
dressed quarks approach. We model the Mellin moments of the GPD using Ans\"atze
for Green functions inspired by the numerical solutions of the Dyson-Schwinger
Equations (DSE) and the Bethe-Salpeter Equation (BSE). Then, the GPD is
reconstructed from its Mellin moment using the Double Distribution (DD)
formalism. The agreement with available experimental data is very good.Comment: 8 pages, 4 figures, proceeding of the 21st International Symposium on
Spin Physics, October 20-24 2014, Beijing, Chin
Pion's valence-quark GPD and its extension beyond DGLAP region
We briefly report on a recent computation, with the help of a fruitful
algebraic model, sketching the pion valence dressed-quark generalized parton
distribution and, very preliminary, discuss on a possible avenue to get
reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and
Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematial regions.Comment: 6 pages, 4 figures, contribution to 21st International conference on
Few-Body Problem
Test of two new parameterizations of the Generalized Parton Distribution
In 2011 Radyushkin outlined the practical implementation of the One-Component
Double Distribution formalism in realistic Generalized Parton Distribution
models. We compare the One-Component Double Distribution framework to the
standard one and compute Deeply Virtual Compton Scattering observables for
both. In particular the new implementation is more flexible, offering a greater
range of variation of the real and imaginary parts of the associated Compton
Form Factor while still allowing to recover results similar to the classical
approach. Moreover the polynomiality property is satisfied up to the highest
order. Although the comparison to experimental data may be improved, the
One-Component Double Distribution modeling is thus an attractive alternative.Comment: 38 pages, 12 figure
A Nakanishi-based model illustrating the covariant extension of the pion GPD overlap representation and its ambiguities
A systematic approach for the model building of Generalized Parton Distributions (GPDs), based on their overlap representation within the DGLAP kinematic region and a further covariant extension to the ERBL one, is applied to the valence-quark pion’s case, using light-front wave functions inspired by the Nakanishi representation of the pion Bethe–Salpeter amplitudes (BSA). This simple but fruitful pion GPD model illustrates the general model building technique and, in addition, allows for the ambiguities related to the covariant extension, grounded on the Double Distribution (DD) representation, to be constrained by requiring a soft-pion theorem to be properly observed.This work is partly supported by the Commissariat à l’Energie Atomique et aux Energies Alternatives, the GDR QCD “Chromodynamique Quantique”, the ANR-12-MONU-0008-01 “PARTONS” and the Span-ish ministry Research Project FPA2014-53631-C2-2-P
Small PARP inhibitor PJ-34 induces cell cycle arrest and apoptosis of adult T-cell leukemia cells
A grant from the One-University Open Access Fund at the University of Kansas was used to defray the author’s publication fees in this Open Access journal. The Open Access Fund, administered by librarians from the KU, KU Law, and KUMC libraries, is made possible by contributions from the offices of KU Provost, KU Vice Chancellor for Research & Graduate Studies, and KUMC Vice Chancellor for Research. For more information about the Open Access Fund, please see http://library.kumc.edu/authors-fund.xml.Background
HTLV-I is associated with the development of an aggressive form of lymphocytic leukemia known as adult T-cell leukemia/lymphoma (ATLL). A major obstacle for effective treatment of ATLL resides in the genetic diversity of tumor cells and their ability to acquire resistance to chemotherapy regimens. As a result, most patients relapse and current therapeutic approaches still have limited long-term survival benefits. Hence, the development of novel approaches is greatly needed.
Methods
In this study, we found that a small molecule inhibitor of poly (ADP-ribose) polymerase (PARP), PJ-34, is very effective in activating S/G2M cell cycle checkpoints, resulting in permanent cell cycle arrest and reactivation of p53 transcription functions and caspase-3-dependent apoptosis of HTLV-I-transformed and patient-derived ATLL tumor cells. We also found that HTLV-I-transformed MT-2 cells are resistant to PJ-34 therapy associated with reduced cleaved caspase-3 activation and increased expression of RelA/p65.
Conclusion
Since PJ-34 has been tested in clinical trials for the treatment of solid tumors, our results suggest that some ATLL patients may be good candidates to benefit from PJ-34 therapy
- …