1,586 research outputs found
Rotational Corrections to in the NJL Model and Charge Conjugation
We show that the rotational corrections to , derived using the
semiclassical quantization scheme in the NJL model, possess correct properties
under charge conjugation.Comment: 4 pages, revtex, no figures, final version published in
Phys.Rev.C52(1995)42
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Predicting Empathy From Resting State Brain Connectivity: A Multivariate Approach.
Recent task fMRI studies suggest that individual differences in trait empathy and empathic concern are mediated by patterns of connectivity between self-other resonance and top-down control networks that are stable across task demands. An untested implication of this hypothesis is that these stable patterns of connectivity should be visible even in the absence of empathy tasks. Using machine learning, we demonstrate that patterns of resting state fMRI connectivity (i.e. the degree of synchronous BOLD activity across multiple cortical areas in the absence of explicit task demands) of resonance and control networks predict trait empathic concern (n = 58). Empathic concern was also predicted by connectivity patterns within the somatomotor network. These findings further support the role of resonance-control network interactions and of somatomotor function in our vicariously driven concern for others. Furthermore, a practical implication of these results is that it is possible to assess empathic predispositions in individuals without needing to perform conventional empathy assessments
Magnetic Moments of the SU(3) Octet Baryons in the semibosonized SU(3) Nambu-Jona-Lasinio Model
We investigate the magnetic moments of the SU(3) octet baryons in the
framework of the semibosonized Nambu--Jona--Lasinio model. The
rotational corrections and strange quark mass in linear order are taken
into account. We derive general relations between magnetic moments of the SU(3)
octet baryons, based on the symmetry of our model. These relations indicate
that higher order corrections such as and are
relatively small. The magnetic moments of the octet baryons predicted by our
model are quantitatively in a good agreement with experimental results within
about 15.Comment: 17 pages, RevTex, 1 postscript figur
Conformational effects on the Circular Dichroism of Human Carbonic Anhydrase II: a multilevel computational study
Circular Dichroism (CD) spectroscopy is a powerful method for investigating conformational changes in proteins and therefore has numerous applications in structural and molecular biology. Here a computational investigation of the CD spectrum of the Human Carbonic Anhydrase II (HCAII), with main focus on the near-UV CD spectra of the wild-type enzyme and it seven tryptophan mutant forms, is presented and compared to experimental studies. Multilevel computational methods (Molecular Dynamics, Semiempirical Quantum Mechanics, Time-Dependent Density Functional Theory) were applied in order to gain insight into the mechanisms of interaction between the aromatic chromophores within the protein environment and understand how the conformational flexibility of the protein influences these mechanisms. The analysis suggests that combining CD semi empirical calculations, crystal structures and molecular dynamics (MD) could help in achieving a better agreement between the computed and experimental protein spectra and provide some unique insight into the dynamic nature of the mechanisms of chromophore interactions
Ratio for the Transition in the Chiral Quark Soliton Model
We calculate the electric quadrupole to magnetic dipole transition ratio
for the reaction \gamma N \ra \Delta(1232) in the chiral quark
soliton model. The calculated ratio is in a good agreement with the
very new experimental data. We obtain non-zero negative value for the electric
quadrupole transition moment, which suggests an oblate deformed
charge structure of the nucleon or/and the delta isobar. Other observables
related to this quantity, namely the mass splitting, the isovector
charge radius, and isovector magnetic moment, are properly reproduced as well.Comment: 11 pages, revtex, a figure included as a postscript fil
B=1 Soliton of the Nambu - Jona-Lasinio model in medium}
The solitonic sector of the Nambu - Jona-Lasinio model with baryon number one
is solved in the presence of an external medium. The calculations fully include
the polarization of both the Dirac sea and the medium as well as the Pauli
blocking effect. We found that with an increasing density the medium
destabilizes the soliton. At finite medium density the soliton mass gets
reduced whereas the mean square baryon radius shows an increase - a swelling of
the soliton. At some critical density of about two times nuclear matter density
there is no localized solution - the soliton disappears.Comment: PHYSTEX, 14 pages, 5 figures (available upon request), Preprint
RUB-TPII-26/9
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